Diagnosis of Weibel instability evolution in the rear surface scale lengths of laser solid interactions via proton acceleration

G G Scott, C M Brenner, V Bagnoud, R J Clarke, B Gonzalez Izquierdo, J S Green, R I Heathcote, H W Powell, D R Rusby, B Zielbauer, P McKenna, D Neely

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

It is shown for the first time that the spatial and temporal distribution of laser accelerated protons can be used as a diagnostic of Weibel instability presence and evolution in the rear surface scale lengths of a solid density target. Numerical modelling shows that when a fast electron beam is injected into a decreasing density gradient on the target rear side, a magnetic instability is seeded with an evolution which is strongly dependent on the density scale length. This is manifested in the formation of a filamented proton beam, where the degree of filamentation is also found to be dependent on the target rear scale length. Furthermore, the energy dependent spatial distribution of the accelerated proton beam is shown to provide information on the instability evolution on the picosecond timescale over which the protons are accelerated. Experimentally, this is investigated by using a controlled prepulse to introduce a target rear scale length, which is varied by altering the time delay with respect to the main pulse, and similar trends are measured. This work is particularly pertinent to applications using laser pulse durations of tens of picoseconds, or where a micron level density scale length is present on the rear of a solid target, such as proton driven fast ignition, as the resultant instability may affect the uniformity of fuel energy coupling.
LanguageEnglish
Article number043010
Number of pages10
JournalNew Journal of Physics
Volume19
Early online date7 Mar 2017
DOIs
Publication statusPublished - 10 Apr 2017

Fingerprint

Weibel instability
protons
lasers
proton beams
interactions
spatial distribution
temporal distribution
laser applications
ignition
pulse duration
time lag
electron beams
trends
gradients
energy
pulses

Keywords

  • spatial distribution
  • temporal distribution
  • laser accelerated protons
  • Weibel instability
  • solid density target
  • numerical modelling
  • filamentation
  • rear surface scale lengths
  • laser solid intractions
  • proton acceleration

Cite this

Scott, G. G., Brenner, C. M., Bagnoud, V., Clarke, R. J., Gonzalez Izquierdo, B., Green, J. S., ... Neely, D. (2017). Diagnosis of Weibel instability evolution in the rear surface scale lengths of laser solid interactions via proton acceleration. New Journal of Physics, 19, [043010]. https://doi.org/10.1088/1367-2630/aa652c
Scott, G G ; Brenner, C M ; Bagnoud, V ; Clarke, R J ; Gonzalez Izquierdo, B ; Green, J S ; Heathcote, R I ; Powell, H W ; Rusby, D R ; Zielbauer, B ; McKenna, P ; Neely, D. / Diagnosis of Weibel instability evolution in the rear surface scale lengths of laser solid interactions via proton acceleration. In: New Journal of Physics. 2017 ; Vol. 19.
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abstract = "It is shown for the first time that the spatial and temporal distribution of laser accelerated protons can be used as a diagnostic of Weibel instability presence and evolution in the rear surface scale lengths of a solid density target. Numerical modelling shows that when a fast electron beam is injected into a decreasing density gradient on the target rear side, a magnetic instability is seeded with an evolution which is strongly dependent on the density scale length. This is manifested in the formation of a filamented proton beam, where the degree of filamentation is also found to be dependent on the target rear scale length. Furthermore, the energy dependent spatial distribution of the accelerated proton beam is shown to provide information on the instability evolution on the picosecond timescale over which the protons are accelerated. Experimentally, this is investigated by using a controlled prepulse to introduce a target rear scale length, which is varied by altering the time delay with respect to the main pulse, and similar trends are measured. This work is particularly pertinent to applications using laser pulse durations of tens of picoseconds, or where a micron level density scale length is present on the rear of a solid target, such as proton driven fast ignition, as the resultant instability may affect the uniformity of fuel energy coupling.",
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Scott, GG, Brenner, CM, Bagnoud, V, Clarke, RJ, Gonzalez Izquierdo, B, Green, JS, Heathcote, RI, Powell, HW, Rusby, DR, Zielbauer, B, McKenna, P & Neely, D 2017, 'Diagnosis of Weibel instability evolution in the rear surface scale lengths of laser solid interactions via proton acceleration' New Journal of Physics, vol. 19, 043010. https://doi.org/10.1088/1367-2630/aa652c

Diagnosis of Weibel instability evolution in the rear surface scale lengths of laser solid interactions via proton acceleration. / Scott, G G; Brenner, C M; Bagnoud, V; Clarke, R J; Gonzalez Izquierdo, B; Green, J S; Heathcote, R I; Powell, H W; Rusby, D R; Zielbauer, B ; McKenna, P ; Neely, D.

In: New Journal of Physics, Vol. 19, 043010, 10.04.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Diagnosis of Weibel instability evolution in the rear surface scale lengths of laser solid interactions via proton acceleration

AU - Scott, G G

AU - Brenner, C M

AU - Bagnoud, V

AU - Clarke, R J

AU - Gonzalez Izquierdo, B

AU - Green, J S

AU - Heathcote, R I

AU - Powell, H W

AU - Rusby, D R

AU - Zielbauer, B

AU - McKenna, P

AU - Neely, D

PY - 2017/4/10

Y1 - 2017/4/10

N2 - It is shown for the first time that the spatial and temporal distribution of laser accelerated protons can be used as a diagnostic of Weibel instability presence and evolution in the rear surface scale lengths of a solid density target. Numerical modelling shows that when a fast electron beam is injected into a decreasing density gradient on the target rear side, a magnetic instability is seeded with an evolution which is strongly dependent on the density scale length. This is manifested in the formation of a filamented proton beam, where the degree of filamentation is also found to be dependent on the target rear scale length. Furthermore, the energy dependent spatial distribution of the accelerated proton beam is shown to provide information on the instability evolution on the picosecond timescale over which the protons are accelerated. Experimentally, this is investigated by using a controlled prepulse to introduce a target rear scale length, which is varied by altering the time delay with respect to the main pulse, and similar trends are measured. This work is particularly pertinent to applications using laser pulse durations of tens of picoseconds, or where a micron level density scale length is present on the rear of a solid target, such as proton driven fast ignition, as the resultant instability may affect the uniformity of fuel energy coupling.

AB - It is shown for the first time that the spatial and temporal distribution of laser accelerated protons can be used as a diagnostic of Weibel instability presence and evolution in the rear surface scale lengths of a solid density target. Numerical modelling shows that when a fast electron beam is injected into a decreasing density gradient on the target rear side, a magnetic instability is seeded with an evolution which is strongly dependent on the density scale length. This is manifested in the formation of a filamented proton beam, where the degree of filamentation is also found to be dependent on the target rear scale length. Furthermore, the energy dependent spatial distribution of the accelerated proton beam is shown to provide information on the instability evolution on the picosecond timescale over which the protons are accelerated. Experimentally, this is investigated by using a controlled prepulse to introduce a target rear scale length, which is varied by altering the time delay with respect to the main pulse, and similar trends are measured. This work is particularly pertinent to applications using laser pulse durations of tens of picoseconds, or where a micron level density scale length is present on the rear of a solid target, such as proton driven fast ignition, as the resultant instability may affect the uniformity of fuel energy coupling.

KW - spatial distribution

KW - temporal distribution

KW - laser accelerated protons

KW - Weibel instability

KW - solid density target

KW - numerical modelling

KW - filamentation

KW - rear surface scale lengths

KW - laser solid intractions

KW - proton acceleration

UR - http://iopscience.iop.org/journal/1367-2630

U2 - 10.1088/1367-2630/aa652c

DO - 10.1088/1367-2630/aa652c

M3 - Article

VL - 19

JO - New Journal of Physics

T2 - New Journal of Physics

JF - New Journal of Physics

SN - 1367-2630

M1 - 043010

ER -