Saturday, June 29, 2013

Survey: Which next-generation game console will lighten your wallet?

We have reached that time of the decade, where major?players in the market of game consoles begin rolling out their latest wares, all in an effort to jump ahead in the market. Nintendo was first to launch with its Wii U box, though few customers seemed to take much notice, while the real battle remains between Microsoft and Sony, however a couple of new players emerge onto the scene in this latest battle.

The consoles?vary, and this may be a question that largely comes down to personal tastes and loyalty -- each of the big names has its diehard fans. The battle for your consumer dollars begins now, with some already on the market, while others are up for pre-order. Here are the combatants in this battle royal.

Xbox One

Microsoft is the 800 pound gorilla?in the market these days. The Xbox 360 has been the market leader for 28 consecutive months. Despite the 360 success, the Xbox One has been shrouded in controversy, even before its announcement.

There was the "always on" fiasco that cost the creative director of Microsoft Studios his job. This was followed by numerous missteps surrounding the connectivity and DRM, culminating with the boneheaded statement to buy a 360 if you do not have a reliable connection.

Despite all of this, the console packs the features and exclusive games that will drive business when the dust settles. There is also a dedicated core of fans who follow along regardless, but that is not exclusive territory to Microsoft and the Xbox franchise.

Specifications include a Blu-ray player, 8 GB of DDR3 memory, 500 GB hard drive, USB 3.0 and a Kinect thrown into the package. Exclusive games announced give users Forza Motorsport 5, Halo and many more.

Sony PS4

The PlayStation from Sony carries a similar crowd of devotees along. Version 4 of the console was announced prior to Microsoft's Xbox One show, which followed in May. At E3 gaming convention, The Redmond, Wash.-based company took center stage with the opening keynote, leaving Sony as a follow-up.

Sony also undercut Microsoft on price, coming in at $100 less than its rival, draining your account of only $399, as opposed to $499.

Despite its early hype and spike in pre-orders, the console has fallen behind in current Amazon rankings, with the Xbox One reaching number three while Sony fades to number seven (as of this writing).

Customers will get Final Fantasy XIV, Drive Club and other titles. Specs include?8?GB of GDDR5 memory, a Blu-ray player, USB 3.0, Bluetooth and more.

Wii U

Remember Nintendo? A little bit at least? Nintendo was once king of the market, but the Super NES days are gone and, despite the success of the Wii, its successor, the Wii U, has stumbled?out of the gate, despite getting to market one year before its rivals.

The Wii U packs 8 GB of flash storage,?AMD Radeon-based High Definition GPU and?2GB of system RAM.

Others

Two other consoles on, or coming, to market are Android-based. The Ouya was the darling of Kickstarter, but launch has been less than a great experience for many early backers.

GamePop is also on the way. This Android game system is being produced by Bluestacks and, for now, is offering its console free of charge, though customers will pay a monthly fee and if canceled, within the first 12 months, the console must be returned to the manufacturer.

Tell Us What You Think

All of the consoles come with media features, though Microsoft is making the biggest play for your living room with TV pass-thru and other extras in an attempt to become your new set-top box. All have their pluses and minuses, so the decision comes down to you and what is right for your family. I will not attempt to influence your decision making. BetaNews wishes to know which, if any, you will be purchasing. Tell us in the survey below and give us feedback in the comments.

Image Credit: Sanzhar Murzin / Shutterstock

Source: http://betanews.com/2013/06/29/survey-which-next-generation-game-console-will-lighten-your-wallet/

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Millions of fans fete victorious Blackhawks

Fans cheer during a rally in Grant Park for the NHL Stanley Cup hockey champion Chicago Blackhawks on Friday, June 28, 2013, in Chicago. (AP Photo/M. Spencer Green)

Fans cheer during a rally in Grant Park for the NHL Stanley Cup hockey champion Chicago Blackhawks on Friday, June 28, 2013, in Chicago. (AP Photo/M. Spencer Green)

The 2013 Stanley Cup Champion Chicago Blackhawks ride in a victory parade down Washington Street as an elevated train passes by Friday, June 28, 2013 in Chicago. The Blackhawks celebrate the team's second championship in four years. (AP Photo/Charles Rex Arbogast)

Chicago Blackhawks' Jonathan Toews holds up the 2013 Stanley Cup during a victory parade down Washington Street Friday, June 28, 2013 in Chicago. The Blackhawks celebrate the team's second championship in four years. (AP Photo/Charles Rex Arbogast)

Chicago Blackhawks' Jonathan Toews holds up the 2013 Stanley Cup during a victory parade down Washington Street Friday, June 28, 2013 in Chicago. The Blackhawks celebrate the team's second championship in four years. (AP Photo/Scott Eisen)

Chicago Blackhawks' fans takes pictures as Jonathan Toews and the Stanley Cup pass by during a victory parade down Washington Street Friday, June 28, 2013 in Chicago. The Blackhawks celebrate the team's second championship in four years. (AP Photo/Scott Eisen)

(AP) ? From the jubilant parade all the way to the boisterous rally, millions of excited fans spent a sun-drenched Friday celebrating another Stanley Cup title for the Chicago Blackhawks.

Dressed mostly in red and black, they came out to say thanks for the memories. Turns out, captain Jonathan Toews and Co. wanted to return the favor.

"This shows how unbelievable this city is," Toews said, addressing the rapt crowd at Grant Park. "Unbelievable. Thank you."

The Blackhawks rode to the rally in red, open-topped buses, passing waving and screaming fans of every age as the parade traveled from the United Center to the downtown party. Toews hoisted the Stanley Cup over his head to show it off to the crowd, which was cooled by large water misters placed along the route with temperatures in the low 80s.

One of the many signs read "Thank you, guys" on the top line and "Best 17 seconds of my life" for the second part ? referring to the pair of late goals that lifted the Blackhawks to a 3-2 title-clinching victory over the Boston Bruins on Monday night. And there was at least one expression of love for Andrew Shaw, the hardscrabble forward who required stitches on his face after he was hit by a puck Monday.

It was the second championship in four seasons for the Blackhawks, and authorities thought Friday's crowd was even heartier than the 2 million that came out in 2010.

"What do you say we get back here and do it again next year?" forward Patrick Sharp said to a big cheer at the rally.

The Grant Park crowd also enjoyed a brief but colorful speech by normally reserved goaltender Corey Crawford, who drew wide grins and chuckles from his teammates.

"It's tough to follow that speech by Corey Crawford," Toews said after he carried the Cup onto the stage.

Chicago Fire Department spokesman Larry Langford said 42 people were taken to hospitals with heat-related health problems. He also said 20 people jumped into a restricted part of Lake Michigan and the fire department made sure that all 20 came out of the water.

The massive crowd at the park grew steadily all morning long, with the most ardent supporters camping out overnight, ready to sprint to the big stage the minute police swung the barriers aside. By the time buses delivered the players and their families, the park was packed.

Some fans brought along homemade versions of the Stanley Cup, including one fashioned from an empty beer keg. Twenty-somethings Courtney Baldwin and Meghan O'Kane, from the city's suburbs, slapped together their tribute from a jumble of jugs and plastic bowls painted grey.

It was empty Friday morning, but Baldwin said they planned to fill it with an adult beverage in the afternoon ? a common occurrence for the actual silver trophy over the past week.

One fan who dashed to the front near the stage was Michael Wilczynski, a 26-year-old sales associate from the suburbs. His father took him to his first game and they partied together downtown after the last Stanley Cup victory.

"My dad died in February. We came to 2010. I'm not going to miss this. I had to be here," he said.

The Blackhawks gave the city something to celebrate as the Cubs and White Sox grind through another lost summer. And fans took note.

"We love the Blackhawks. This is history and this is a championship, unlike the Cubs," O'Kane said, taking a shot at a team that hasn't won a World Series since 1908.

The franchise's fifth Stanley Cup was the culmination of a banner season for the Blackhawks, who set an NHL record when they recorded at least one point in the first 24 games ? half of the lockout-shortened schedule. They finished with the best record in the league.

The dramatic Game 6 victory in Boston sparked a raucous party in parts of Chicago. Fans poured out of bars after the thrilling finish and celebrated in the streets in the several neighborhoods.

Sarah Schmidt, 22, who grew up in Chicago and made the pilgrimage to Friday's celebrations from Milwaukee, told her boss she was taking the day off no matter what. She hoped her bartending gig would still be there when the party was over.

"I can't miss this," she said.

___

Jay Cohen can be reached at http://www.twitter.com/jcohenap

Associated Press

Source: http://hosted2.ap.org/APDEFAULT/347875155d53465d95cec892aeb06419/Article_2013-06-28-HKN-Blackhawks-Parade/id-f796f6caca01465ea9b35f94c28caeb6

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From Egypt petition drive, a new grassroot wave

An Egyptian man holds a banner with the word rebel in it during a demonstration supporting the Tamarod, Arabic for "rebel" campaign in Tahrir Square in Cairo, Egypt, Wednesday, June 26, 2013. In abstract terms, protests planned for Sunday, June 30, 2013 aiming to force out Egypt?s Islamist president violate a basic principle of democracy: If an election has been held, all must respect the results, otherwise it?s political chaos. Supporters of President Mohammed Morsi have been angrily making that argument for days. Those behind the protests insist he lost the legitimacy of that election victory by power grabs and missteps.(AP Photo/Manu Brabo)

An Egyptian man holds a banner with the word rebel in it during a demonstration supporting the Tamarod, Arabic for "rebel" campaign in Tahrir Square in Cairo, Egypt, Wednesday, June 26, 2013. In abstract terms, protests planned for Sunday, June 30, 2013 aiming to force out Egypt?s Islamist president violate a basic principle of democracy: If an election has been held, all must respect the results, otherwise it?s political chaos. Supporters of President Mohammed Morsi have been angrily making that argument for days. Those behind the protests insist he lost the legitimacy of that election victory by power grabs and missteps.(AP Photo/Manu Brabo)

Egyptians walk below a banner of Tamarod, Arabic for "rebel," with Arabic that reads, "tamarod, Egypt now is free," a campaign calling for the ouster of Egyptian President Mohammed Morsi, in Cairo, Egypt, Wednesday, June 26, 2013. Organizers of Tamarod had announced that they have collected millions of signatures supporting Morsi's ouster and early presidential elections. (AP Photo/Hassan Ammar)

In this Sunday, June 2, 2013 photo, an Egyptian woman signs a petition for Tamarod, Arabic for "rebel", a campaign calling for the ouster of Egyptian President Mohammed Morsi and for early presidential elections in the Shubra neighborhood in Cairo, Egypt. Young activists are trying to rally public discontent with Egypt?s Islamist President Mohammed Morsi by fanning out in the streets and collecting millions of signatures on a petition calling for his removal. Morsi?s Muslim Brotherhood has dismissed the campaign as irrelevant, even illegal, but the signature drive has stirred up Egypt?s politics as the president nears the end of his tumultuous first year in office. (AP Photo/Hassan Ammar)

FILE - In this Thursday, May 16, 2013 file photo, an Egyptian woman signs a leaflet for the campaign Tamarod, or "rebel" in Arabic, that seeks to withdraw confidence from Egypt's Islamist President Mohamed Morsi, in Cairo, Egypt. Opponents of Egypt?s Islamist president are convinced that nationwide protests planned for June 30 are their last opportunity to drive him from power. They say they have tapped into widespread public discontent over shortages, broken infrastructure, high prices and lack of security, and can bring that anger into the streets. (AP Photo/Nasser Nasser, File)

FILE - In this Friday, May 17, 2013 file photo, An Egyptian activist covers her face with an applications for "Tamarod", Arabic for "rebel", a campaign calling for the ouster of Egyptian President Mohammed Morsi and for early presidential elections, during a protest in Tahrir Square, in Cairo, Egypt. Amid Egypt?s multiple woes under an Islamist-dominated administration, religion is not the political selling point it once was among Egyptians, one factor fueling planned weekend protests calling for Morsi?s fall. (AP Photo/Hassan Ammar, File)

(AP) ? Teenager Gehad Mustafa wears an ultraconservative veil over her face and was raised in a family of staunch Muslim Brotherhood supporters. Yet for the past weeks, she has been walking though chaotic street markets and crowded subway stations, collecting signatures on a petition demanding Islamist President Mohammed Morsi step down.

The months-long petition campaign by the group "Tamarod," Arabic for "rebel," is now culminating in nationwide protests Sunday in which the opposition hopes to bring out millions to force Morsi out of office, a year after his inauguration.

But Tamarod's organizers say they are not stopping there. No matter what happens on Sunday, they say they have created through their petition drive a real grassroots network, an opposition version in the spirit of the Islamists' expert street organizing, and have brought forth a sort of second generation of street activists, like Mustafa, after the first that led the revolt against autocrat Hosni Mubarak in 2011.

They want to use that network going ahead, to keep the public involved and to pressure the secular and liberal opposition parties, who the activists say have wasted opportunities through infighting and fragmentation, to get their act together.

On a recent day, Tamarod's main office, steps away from Cairo's Tahrir Square, was bustling with several dozen volunteers as young as 13 and as old as their 50s and 60s. University professors, government employees, students and housewives sipped tea, smoked and chatted while going through the organization's prize possession: the sheaves of signed petitions still coming in from around the country, filling the office.

The pages of signatures, they say, are proof of how deeply the country of 90 million has turned against the Muslim Brotherhood. They plan to announce their full count ahead of Sunday's protests but have claimed to have as many as 20 million signatures, which they collate, confirm and record in a database in a precise operation, knowing their count will be questioned.

Among the volunteers was 17-year-old Mustafa. She said she turned against Morsi and his Muslim Brotherhood after the first protesters were killed under his administration in late 2012. "I saw the reality," she said. "You told us that the blood of the martyrs will not go in vain. But there were more ... falling under your rule."

She joined Tamarod, which launched in late April, and volunteered to canvas the street for signatures. At one point, while passing out petitions in the subway, a man wearing the beard of a Muslim conservative attacked her, pulling the veil off her face. But other commuters then wrestled the man away in support of her.

"This strengthened me. I felt what I am doing is right," she said.

Organizers say Tamarod mushroomed across the country. Founded by five activists, its leadership is a central group of about 25, connected to a network of coordinators in Egypt's 27 provinces, each with a team of volunteers in towns and villages.

The signatures are effectively a database of the dissatisfied: Each signatory puts his or her name, province of residence and national ID number.

Collecting signatures in itself is a breakthrough, overcoming Egyptians' engrained resistance to signing onto any paper presented by a stranger, especially political, from the Mubarak days when doing so could get you a visit from state security or even arrested. Volunteers carrying the petitions brought politics into every corner ? weddings, slum alleys, buses and subways. Volunteers included strangers to political campaigning, from men selling cigarettes in kiosks to impoverished women selling in vegetable markets.

Ahmed el-Masry, one of the founders of Tamarod, calls the success "astonishing."

"I can't tell how many members out there. I can think that millions of Egyptians are members," he said.

"At one point, people gave up (on Morsi) ... it reached a point where a new class of Brothers are gaining higher status in society that to join them, you have to let your beard grow. We reached a point where no one is heard but the president and his tribe."

Brotherhood officials cast doubt on the signatures, claiming forgeries and multiple names. While Morsi says peaceful demonstrations are a legitimate form of expression, he and his allies also say Mubarak loyalists are behind the campaign and protests, trying to use the streets to topple an elected leader.

A spokesman for the Brotherhood's Freedom and Justice Party said he sympathizes with some activists in Tamarod ? "the young revolutionaries who had great expectations out of the revolution. Due to their inexperience and age, they wanted to see change too fast and too soon and that is what I call frustration."

But Abdel-Mawgoud el-Dardery said "opportunist politicians" are exploiting them for their political agenda and that former regime elements are exploiting both the politicians and the activists.

"There is unholy alliance among these groups. They have insisted on having one enemy and that is President Morsi," he said.

Tamarod activists say it is they who are leading the politicians of the mainly liberal and secular opposition parties and factions, trying to drag them into a better connection with the public. The campaign's plan calls for Morsi to leave, the chief justice of the Supreme Constitutional Court to become a largely symbolic interim president while a technocrat Cabinet governs, a panel would write a new constitution and presidential elections would be held in six months.

Ahmed Abdu, one of the first Tamarod street campaigners, said the group will pressure the opposition to coalesce behind a candidate.

If they can't get organized "we will pick one away from all the top leaders of opposition and we will be able to rally support to him."

He blamed liberal parties for running multiple candidates in last year's presidential election, which resulted in a runoff between Morsi and a former Mubarak prime minister, forcing people to choose between an Islamist and a loyalist of the regime just ousted.

"I hope they don't let us down again," Abdu said.

Tamarod's nationwide network and pavement-pounding methods contrast with many of the political parties, which have struggled to establish a nationwide presence. That is in large part what opened the way for the Muslim Brotherhood, an 83-year-old organization that has highly disciplined cadres nationwide, and harder-line Islamist with their own organizations to dominate parliament elections in late 2011-early 2012, to ensure the constitution passed a December referendum, and to boost Morsi to victory.

Tamarod's volunteers ? some former Morsi supporters, others who disliked him from the start ? had varying stories of what brought them to the campaign. Most said they were dismayed by what they call the Brotherhood's opportunism and determination to control the system rather than reform state institutions and police. That is a frequent refrain from critics of Morsi. His allies insist they are not trying to monopolize, that opponents have refused to work with them and that old regime loyalists have sabotaged their attempts at reform.

At the Tamarod office, Doaa Mohammed, a young Justice Ministry employee, said the day after Morsi's election, a man on the street spit at her face and yelled, "Tomorrow, Morsi will get rid of you all."

Mohammed wears a stylish scarf covering her hair, less strict than the more cloaking coverings and veils that hard-liners believe women should wear.

She said managers in her ministry were replaced by Brotherhood sympathizers.

"From day one, I have been treated like a second-class citizen. The Sister enjoys higher status than me just because she belongs to the group," she said, referring to the Muslim Sisters, the women's branch of the Brotherhood.

The heart of Tamarod is its petitions. Through Facebook and Twitter, volunteers could download the form, copy it and distribute them among friends and family members or hit the streets for signatures, then get back in touch with coordinators to return the papers.

At the Tamarod office, a psychology university lecturer-turned-volunteer explained how the papers are sorted by province, counted, scanned and entered into a database to ensure there are no doubled ID numbers and that the numbers ? which have prefixes by province ? match where they're said to come from. Much of the work takes place in a room labeled "Control Room. No Entry."

Secrecy is tight. The university lecturer spoke on condition of anonymity ? he goes by the nickname "Maestro" ? so he could not be singled out for pressure by anyone trying to get to the petitions. He said only two of the founders know the whereabouts of the originals of the signed forms and are responsible for moving them every few days to new locations.

"We are working in the daylight but they don't want us to work in the daylight," he said and added, "we are holding a pen and a paper. This is our weapon. And this is how we tell them, Enough"

Associated Press

Source: http://hosted2.ap.org/APDEFAULT/cae69a7523db45408eeb2b3a98c0c9c5/Article_2013-06-28-Egypt-New%20Grassroots/id-05e0c0fa9a6f4cba8b88f95927d29034

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Thursday, June 27, 2013

The Daily Roundup for 06.27.2013

You might say the day is never really done in consumer technology news. Your workday, however, hopefully draws to a close at some point. This is the Daily Roundup on Engadget, a quick peek back at the top headlines for the past 24 hours -- all handpicked by the editors here at the site. Click on through the break, and enjoy.

DNP The Daily RoundUp

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Comments

Source: http://feeds.engadget.com/~r/weblogsinc/engadget/~3/Lw4GPTqNFXQ/

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Travels of Joy and Beyond: Seek Legal Help for Personal Injuries

During summer time, a lot of people tend to go to a different state for a family or couple getaway just to enjoy what life has to offer and also to experience being away from the stressful world for once. I knew some people who loves to go to Florida for a family vacation. Sometimes, they do rent rental vacation homes or an apartment for a week to also save money compare to staying in a hotel. I'm sure a lot of people did the same thing in order to fully enjoy their family vacation getaway, it's also a must have to save money as much as possible. Therefore, things like this also the best alternative to spend more money.

However, we may never know what's ahead, especially with kids, we will never deny that for once in a while, accidents may happen. What if you've been injured or someone in your family are? It may be weird to think about it, but sometimes, it is important to consider things. If injuries ruined your vacation, then maybe it's time to seek help to an expert when it comes to Premises Liability Injuries that you or someone in your household had suffer, to seek liability particularly to injuries involving children.

Sometimes, this can happen during a vacation or staying at rental vacation homes that aren't really well maintenance or fully well maintained. So, if these happen to you, then contact the Personal Injury Lawyers in Fort Lauderdale located in Florida. Then, you and your family member's medical needs will be meet such as medical bills, lost wages and out-of-pocket expenses. To resolve your injury claim or accident, then it's time to seek legal help. You deserve to be compensated. Life is too short to suffer and be in anguish, where you supposed to enjoy your family vacation, rather, sometimes life is too complicated but with the help of an attorney, life can be good.

--------------------------------------------------------------------------------------------------------------

Source: http://www.pinayinstates.us/2013/06/seek-legal-help-for-personal-injuries.html

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Friday, June 21, 2013

Particle accelerator that can fit on a tabletop opens new chapter for science research

Particle accelerator that can fit on a tabletop opens new chapter for science research [ Back to EurekAlert! ] Public release date: 20-Jun-2013
[ | E-mail | Share Share ]

Contact: Michael Downer
downer@physics.utexas.edu
512-471-6054
University of Texas at Austin

Tabletop device achieves energy and focus that has previously required a conventional accelerator that stretches more than the length of 2 football fields

AUSTIN, Texas Physicists at The University of Texas at Austin have built a tabletop particle accelerator that can generate energies and speeds previously reached only by major facilities that are hundreds of meters long and cost hundreds of millions of dollars to build.

"We have accelerated about half a billion electrons to 2 gigaelectronvolts over a distance of about 1 inch," said Mike Downer, professor of physics in the College of Natural Sciences. "Until now that degree of energy and focus has required a conventional accelerator that stretches more than the length of two football fields. It's a downsizing of a factor of approximately 10,000."

The results, which were published this week in Nature Communications, mark a major milestone in the advance toward the day when multi-gigaelectronvolt (GeV) laser plasma accelerators are standard equipment in research laboratories around the world.

Downer said he expects 10 GeV accelerators of a few inches in length to be developed within the next few years, and he believes 20 GeV accelerators of similar size could be developed within a decade.

Downer said that the electrons from the current 2 GeV accelerator can be converted into "hard" X-rays as bright as those from large-scale facilities. He believes that with further refinement they could even drive an X-ray free electron laser, the brightest X-ray source currently available to science.

A tabletop X-ray laser would be transformative for chemists and biologists, who could use the bright X-rays to study the molecular basis of matter and life with atomic precision, and femtosecond time resolution, without traveling to a large national facility.

"The X-rays we'll be able to produce are of femtosecond duration, which is the time scale on which molecules vibrate and the fastest chemical reactions take place," said Downer. "They will have the energy and brightness to enable us to see, for example, the atomic structure of single protein molecules in a living sample."

To generate the energetic electrons capable of producing these X-rays, Downer and his colleagues employed an acceleration method known as laser-plasma acceleration. It involves firing a brief but intensely powerful laser pulse into a puff of gas.

"To a layman it looks like low technology," said Downer. "All you do is make a little puff of gas with the right density and profile. The laser pulse comes in. It ionizes that gas and makes the plasma, but it also imprints structure in it. It separates electrons from the ion background and creates these enormous internal space-charge fields. Then the charged particles emerge right out of the plasma, get trapped in those fields, which are racing along at nearly the speed of light with that laser pulse, and accelerate in them."

Downer compared it to what would happen if you threw a motorboat into a lake with its engines churning. The boat (the laser) makes a splash, then creates a wave as it moves through the lake at high speed. During that initial splash some droplets (charged particles) break off, get caught up in the wave and accelerate by surfing on it.

"At the other end of the lake they get thrown off into the environment at incredibly high speeds," said Downer. "That's our 2 GeV electron beam."

Former UT Austin physicist Toshiki Tajima and the late UCLA physicist John Dawson conceived the idea of laser-plasma acceleration in the late 1970s. Scientists have been experimenting with this concept since the early 1990s, but they've been limited by the power of their lasers. As a result the field had been stuck at a maximum energy of about 1 GeV for years.

Downer and his colleagues were able to use the Texas Petawatt Laser, one of the most powerful lasers in the world, to push past this barrier. In particular the petawatt laser enabled them to use gases that are much less dense than those used in previous experiments.

"At a lower density, that laser pulse can travel faster through the gas," said Downer. "But with the earlier generations of lasers, when the density got too low, there wasn't enough of a splash to inject electrons into the accelerator, so you got nothing out. This is where the petawatt laser comes in. When it enters low density plasma, it can make a bigger splash."

Downer said that now that he and his team have demonstrated the workability of the 2 GeV accelerator, it should be only a matter of time until 10 GeV accelerators are built. That threshold is significant because 10 GeV devices would be able to do the X-ray analyses that biologists and chemists want.

"I don't think a major breakthrough is required to get there," he said. "If we can just keep the funding in place for the next few years, all of this is going to happen. Companies are now selling petawatt lasers commercially, and as we get better at doing this, companies will come into being to make 10 GeV accelerator modules. Then the end users, the chemists and biologists, will come in, and that will lead to more innovations and discoveries."

###


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AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.


Particle accelerator that can fit on a tabletop opens new chapter for science research [ Back to EurekAlert! ] Public release date: 20-Jun-2013
[ | E-mail | Share Share ]

Contact: Michael Downer
downer@physics.utexas.edu
512-471-6054
University of Texas at Austin

Tabletop device achieves energy and focus that has previously required a conventional accelerator that stretches more than the length of 2 football fields

AUSTIN, Texas Physicists at The University of Texas at Austin have built a tabletop particle accelerator that can generate energies and speeds previously reached only by major facilities that are hundreds of meters long and cost hundreds of millions of dollars to build.

"We have accelerated about half a billion electrons to 2 gigaelectronvolts over a distance of about 1 inch," said Mike Downer, professor of physics in the College of Natural Sciences. "Until now that degree of energy and focus has required a conventional accelerator that stretches more than the length of two football fields. It's a downsizing of a factor of approximately 10,000."

The results, which were published this week in Nature Communications, mark a major milestone in the advance toward the day when multi-gigaelectronvolt (GeV) laser plasma accelerators are standard equipment in research laboratories around the world.

Downer said he expects 10 GeV accelerators of a few inches in length to be developed within the next few years, and he believes 20 GeV accelerators of similar size could be developed within a decade.

Downer said that the electrons from the current 2 GeV accelerator can be converted into "hard" X-rays as bright as those from large-scale facilities. He believes that with further refinement they could even drive an X-ray free electron laser, the brightest X-ray source currently available to science.

A tabletop X-ray laser would be transformative for chemists and biologists, who could use the bright X-rays to study the molecular basis of matter and life with atomic precision, and femtosecond time resolution, without traveling to a large national facility.

"The X-rays we'll be able to produce are of femtosecond duration, which is the time scale on which molecules vibrate and the fastest chemical reactions take place," said Downer. "They will have the energy and brightness to enable us to see, for example, the atomic structure of single protein molecules in a living sample."

To generate the energetic electrons capable of producing these X-rays, Downer and his colleagues employed an acceleration method known as laser-plasma acceleration. It involves firing a brief but intensely powerful laser pulse into a puff of gas.

"To a layman it looks like low technology," said Downer. "All you do is make a little puff of gas with the right density and profile. The laser pulse comes in. It ionizes that gas and makes the plasma, but it also imprints structure in it. It separates electrons from the ion background and creates these enormous internal space-charge fields. Then the charged particles emerge right out of the plasma, get trapped in those fields, which are racing along at nearly the speed of light with that laser pulse, and accelerate in them."

Downer compared it to what would happen if you threw a motorboat into a lake with its engines churning. The boat (the laser) makes a splash, then creates a wave as it moves through the lake at high speed. During that initial splash some droplets (charged particles) break off, get caught up in the wave and accelerate by surfing on it.

"At the other end of the lake they get thrown off into the environment at incredibly high speeds," said Downer. "That's our 2 GeV electron beam."

Former UT Austin physicist Toshiki Tajima and the late UCLA physicist John Dawson conceived the idea of laser-plasma acceleration in the late 1970s. Scientists have been experimenting with this concept since the early 1990s, but they've been limited by the power of their lasers. As a result the field had been stuck at a maximum energy of about 1 GeV for years.

Downer and his colleagues were able to use the Texas Petawatt Laser, one of the most powerful lasers in the world, to push past this barrier. In particular the petawatt laser enabled them to use gases that are much less dense than those used in previous experiments.

"At a lower density, that laser pulse can travel faster through the gas," said Downer. "But with the earlier generations of lasers, when the density got too low, there wasn't enough of a splash to inject electrons into the accelerator, so you got nothing out. This is where the petawatt laser comes in. When it enters low density plasma, it can make a bigger splash."

Downer said that now that he and his team have demonstrated the workability of the 2 GeV accelerator, it should be only a matter of time until 10 GeV accelerators are built. That threshold is significant because 10 GeV devices would be able to do the X-ray analyses that biologists and chemists want.

"I don't think a major breakthrough is required to get there," he said. "If we can just keep the funding in place for the next few years, all of this is going to happen. Companies are now selling petawatt lasers commercially, and as we get better at doing this, companies will come into being to make 10 GeV accelerator modules. Then the end users, the chemists and biologists, will come in, and that will lead to more innovations and discoveries."

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Source: http://www.eurekalert.org/pub_releases/2013-06/uota-pat062013.php

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