Navigation Links
Higher energies for laser-accelerated particles possible
Date:7/2/2012

ndicularly to the foil's surface, just like previous models predict. But that is not the case with a tilted laser pulse. If the angle of the thin light disk is slightly tilted with respect to the axis of propagation, something unexpected happens during the first phase of the particle acceleration. The electrons feel the rotation of the light disk and follow the direction in which the light hits the foil. Moreover, protons are accelerated along this direction as well and, in contrast to the electrons, maintain their direction. This novel observation of the directional dependence permits the Dresden physicists to also look directly at the underlying acceleration process.

"During the first acceleration phase, the distance between the electrons and the foil is extremely small. Once the short laser pulse has pushed them through the foil, they immediately swing back again because the foil has a positive charge. That is one reason why we were very surprised to discover that not only the electrons follow the motion of the laser light, but also the protons exhibit this previously unknown directional dependence," notes the doctoral candidate and main author of the current publication, Karl Zeil. He managed to detect another particular feature which only occurs with ultra-short laser pulses: The initial phase is decisive for the entire acceleration process. During the first 30 femtoseconds that is, one millionth of one billionth of a second, and equal to the length of the laser pulse the acceleration is very efficient. The short and efficient acceleration phase is followed by a longer expansion phase, during which a uniform and symmetrical plasma cloud is formed. The protons, however, gain so much energy during the first phase which, in turn, makes them so fast that they finally can reach higher energies than conventional models would predict.

Precisely how the fast electrons oscillate around the foil, and thus, accelerate the protons, is investigated by t
'/>"/>

Contact: Anja Weigl
a.weigl@hzdr.de
49-351-260-2452
Helmholtz Association of German Research Centres
Source:Eurekalert  

Page: 1 2 3

Related medicine news :

1. Prostate cancer treatment regret is 52 percent higher in men with cardiovascular disease
2. Childless women with fertility problems at higher risk of hospitalization for psychiatric disorders
3. Higher levels of public reimbursement positively influence national birth rates and reduce unmet needs in subfertile populations
4. Asthma Rates Higher Near Busy New York Highway
5. Smallest, Largest Fetuses at Higher Risk of Stillbirth
6. Rate of severe reactions higher than thought in young children with food allergies
7. Higher medical home performance rating of community health centers linked with higher operating cost
8. Higher quality of life seen among regular moderate drinkers than among abstainers
9. Canadian teen moms run higher risk of abuse, depression than older mothers
10. Does More Dental Plaque Mean Higher Chances of Dying From Cancer?
11. Hepatitis B Infection Rates in U.S. Higher Than Thought
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Higher energies for laser-accelerated particles possible
(Date:4/14/2014)... orphaned by HIV/AIDS in South Africa may provide insight ... behavior issues in other areas of the world, which ... that could lead to successful interventions. , A ... United Nations mentions that due to the HIV/AIDS pandemic, ... African, children are at an increased risk for mental ...
(Date:4/14/2014)... A new study shows that moderate to severe ... risk of stroke, cancer and death. , Results of ... to severe obstructive sleep apnea were four times more ... times more likely to have a stroke (HR = ... (HR = 3.4), and 2.5 times more likely to ...
(Date:4/14/2014)... Dallas study involving serious youth offenders, the answer to one ... seven years: "How long do you think you,ll live?", According ... offending over time., Author Dr. Alex Piquero said the study ... of them offend at very high rates and commit more ... much later in life offend much less., "In a lot ...
(Date:4/14/2014)... with symptoms increasing dramatically during some of the most important ... has found. , Depressive symptoms increased on average by 68 ... young men, who were around 25 years old when they ... their children. The results of the study were published April ... is the first to identify when young fathers are at ...
(Date:4/14/2014)... Lower weight babies and babies who aren,t breastfed ... risk of developing chronic inflammation and related health ... study. , "There were good reasons to hypothesize ... inflammation in adulthood," says Thomas McDade (Northwestern University), ... in the Child & Brain Development program. "It ...
Breaking Medicine News(10 mins):Health News:Researchers identify children with emotional behavior difficulties 2Health News:Researchers identify children with emotional behavior difficulties 3Health News:Study links severe sleep apnea to increased risk of stroke, cancer and death 2Health News:UT Dallas study: Youth who fail to envision future commit more crimes 2Health News:Young dads at high risk of depression, too 2Health News:Low birth weight, less breastfeeding create later health risks 2
... World AIDS day, the Andhra Pradesh State AIDS Control Society (APSACS) ... rally which was participated by students from school and ... that in the year 2004, more than 4.9 million people are ... it is estimated that by 2010 more than 75 million people ...
... Institute of Environmental Health Sciences (NIEHS), conducted a study ... starch predisposes to respiratory problems. // ,"These ... Stephanie London, M.D., lead investigator on the study. "We ... data from such a large number of participants to ...
... health sector of England has both doctors and nurses of ... almost 20 percent.// The National Health Service (NHS) of ... Children's Hospital, in the Wellchild awards. ,Jaswant ... has been honoured in a national competition. Children's health charity ...
... worded news the Centre for Science in the Public Interest, ... to ban the sale of - the fake meat made from ... found to induce vomiting and many people fell ill. ... with fungi based 'mycoprotein.' That ingredient springs from a single-celled fungus. ...
... A research conducted by the University of Alberta has revealed ... men and women, while performing the same tasks. This goes ... women really do work differently. The volunteers for the study ... tasks, verbal tasks, and memory tasks, while the functional Magnetic ...
... dynamic process. It helps us to retrieve information from different areas ... of Molecular and Cellular biology at Baylor college of Medicine (BCM) ... is a chemical change in the tissue representing the formation of ... only after 30 minutes mediated by the gene amnesiac but lasted ...
Cached Medicine News:
(Date:1/15/2014)... Jan. 15, 2014  Celsion Corporation (the "Company") (NASDAQ: ... has received commitments from institutional investors to purchase ... Company,s common stock in an at-the-market registered direct ... The Company entered into definitive purchase ... Company agreed to sell an aggregate of 3,603,603 ...
(Date:1/15/2014)...  Humberto C. Antunes,  Galderma  worldwide CEO, will receive ... Journal of Drugs in Dermatology (JDD) at the ... event is January 17-20, 2014, at the Omni Orlando Resort at ... The ODAC is a distinguished event that delivers ... clinical and aesthetic dermatology practitioners in the 21 st ...
(Date:1/15/2014)... PALM BEACH GARDENS, Fla. , Jan. 15, 2014 /PRNewswire/ ... such as MRSA, C. difficile and TB in ambulances and ... manufactured by MRSA-UV is now being used by rescue personnel ... prevent EMS paramedics and transport patients from coming in contact ... Fire Rescue is the first in the nation to ...
Breaking Medicine Technology:Celsion Corporation Announces $15 Million At-The-Market Registered Direct Offering 2Celsion Corporation Announces $15 Million At-The-Market Registered Direct Offering 3Galderma's global leader honored with a "Lifetime in Dermatology Achievement Award" by Journal of Drugs in Dermatology 2Galderma's global leader honored with a "Lifetime in Dermatology Achievement Award" by Journal of Drugs in Dermatology 3Galderma's global leader honored with a "Lifetime in Dermatology Achievement Award" by Journal of Drugs in Dermatology 4Superbugs No Longer Ride In Rescue Vehicles 2
... 2011 Susquehanna Growth Equity, LLC (SGE) today announced ... a provider of managed care information for the healthcare ... and interpretation of pharmaceutical and healthcare information from health ... in managed markets. In addition, it offers data collection, ...
... SILVER SPRING, Md., April 18, 2011 ... the U.S. Food and Drug Administration. I nformation in ... times for items are current as of April 18, 2011. ... FDA News & Notes does not contain any regulatory or ...
Cached Medicine Technology:Susquehanna Growth Equity Acquires MediMedia Information Technologies, LLC 2Susquehanna Growth Equity Acquires MediMedia Information Technologies, LLC 3FDA News & Notes - Week of April 18, 2011 2
... a national reference laboratory and a worldwide ... ARUP offers an extensive test menu of ... clinical and anatomic pathology. Owned by the ... more than half of the nation's university ...
... is a national reference laboratory and a ... development. ARUP offers an extensive test menu ... in clinical and anatomic pathology. Owned by ... include more than half of the nation's ...
... reference laboratory and a worldwide leader in ... an extensive test menu of highly complex ... anatomic pathology. Owned by the University of ... half of the nation's university teaching hospitals ...
... ARUP Laboratories is a national reference ... laboratory research and development. ARUP offers an ... unique medical tests in clinical and anatomic ... ARUP Laboratories' clients include more than half ...
Medicine Products: