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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/12382809
Record Status
Checked
Record Id
12382809
Title
Laser pulse propagation and enhanced energy coupling to fast electrons in dense plasma gradients
Contributors
RJ Gray (Strathclyde Univ.)
,
DC Carroll (STFC Rutherford Appleton Lab., and Strathclyde Univ.)
,
XH Yuan (Strathclyde Univ.)
,
CM Brenner (STFC Rutherford Appleton Lab., and Strathclyde Univ.)
,
M Burza
,
M Coury (Strathclyde Univ.)
,
KL Lancaster (STFC Rutherford Appleton Lab.)
,
XX Lin
,
YT Li
,
D Neely (STFC Rutherford Appleton Lab., and Strathclyde Univ.)
,
MN Quinn
,
O Tresca
,
C Wahlström
,
P McKenna
Abstract
Laser energy absorption to fast electrons during the interaction of an ultra-intense (1020 W cm−2), picosecond laser pulse with a solid is investigated, experimentally and numerically, as a function of the plasma density scale length at the irradiated surface. It is shown that there is an optimum density gradient for efficient energy coupling to electrons and that this arises due to strong self-focusing and channeling driving energy absorption over an extended length in the preformed plasma. At longer density gradients the laser filaments, resulting in significantly lower overall energy coupling. As the scale length is further increased, a transition to a second laser energy absorption process is observed experimentally via multiple diagnostics. The results demonstrate that it is possible to significantly enhance laser energy absorption and coupling to fast electrons by dynamically controlling the plasma density gradient.
Organisation
CLF
,
CI
,
STFC
,
BID
Keywords
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Language
English (EN)
Type
Details
URI(s)
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Year
Journal Article
New J Phys
16, no. 11 (2014): 113075.
doi:10.1088/1367-2630/16/11/113075
2014
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