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Title: Compact tunable Compton x-ray source from laser-plasma accelerator and plasma mirror

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4907655· OSTI ID:1416566

We present an in-depth experimental-computational study of the parameters necessary to optimize a tunable, quasi-monoenergetic, efficient, low-background Compton backscattering (CBS) x-ray source that is based on the self-aligned combination of a laser-plasma accelerator (LPA) and a plasma mirror (PM). The main findings are (1) an LPA driven in the blowout regime by 30 TW, 30 fs laser pulses produce not only a high-quality, tunable, quasi-monoenergetic electron beam, but also a high-quality, relativistically intense (a0 ~ 1) spent drive pulse that remains stable in profile and intensity over the LPA tuning range. (2) A thin plastic film near the gas jet exit retro-reflects the spent drive pulse efficiently into oncoming electrons to produce CBS x-rays without detectable bremsstrahlung background. Meanwhile, anomalous far-field divergence of the retro-reflected light demonstrates relativistic “denting” of the PM. Exploiting these optimized LPA and PM conditions, we demonstrate quasi-monoenergetic (50% FWHM energy spread), tunable (75–200 KeV) CBS x-rays, characteristics previously achieved only on more powerful laser systems by CBS of a split-off, counter-propagating pulse. Moreover, laser-to-x-ray photon conversion efficiency (~6 × 10-12) exceeds that of any previous LPA-based quasi-monoenergetic Compton source. Particle-in-cell simulations agree well with the measurements.

Research Organization:
Univ. of Texas, Austin, TX (United States); Tech-X Corp, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); US Air Force Office of Scientific Research (AFOSR); Robert Welch Foundation; National Science Foundation (NSF)
Grant/Contract Number:
SC0012444; SC0011617; SC0007889; SC0010622; FG02-04ER54742; FC52-08NA28512; FA9550-14-1-0045; EP/G056803/1; EP/G054940/1; EP/G055165/1; F-1038. H.-E.T; PHY-1354531
OSTI ID:
1416566
Alternate ID(s):
OSTI ID: 1228526
Report Number(s):
DOE-UT-12444-1
Journal Information:
Physics of Plasmas, Vol. 22, Issue 2; Related Information: Zhengyan Li, Hai-En Tsai, Xi Zhang, C.-H. Pai, R. Zgadzaj, X. Wang, V. Khudik, G. Shvets and M. C. DOWNER,” Single-shot optical visualization of evolving laser wakefields using an all-optical streak camera,” Phys. Rev. Lett. 113, 085001 (2014).H.E. Tsai, X. Wang, J. M. Shaw, Z. Li, A. V. Arefiev, X. Zhang, R. Zgadzaj, W. Henderson, V. Khudik, G. Shvets, and M. C. DOWNER, “Compact tunable Compton x-ray sources from laser-plasma accelerator and plasma mirror,” Phys. Plasmas 22, 023106 (2015).H.-E. Tsai, A. V. Arefiev, J. M. Shaw, D. J. Stark, X. Wang, R. Zgadzaj, M. C. Downer, “Self-aligning concave relativistic plasma mirror with adjustable focus,” Phys. Plasmas 24, 013106 (2017).N. H. Matlis, A. Maksimchuk, Y. Yanovsky, W. P. Leemans, and M. C. Downer, "Analysis of sinusoidally-modulated chirped laser pulses by temporally-encoded spectral shifting," Opt. Lett. 41, 5503 (2016).; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 62 works
Citation information provided by
Web of Science

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Ultrahigh brilliance quasi-monochromatic MeV γ-rays based on self-synchronized all-optical Compton scattering journal July 2016
Self-aligning concave relativistic plasma mirror with adjustable focus journal January 2017
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Optimizing the energies conversion in laser-electron beam collision journal March 2019
X-ray sources using a picosecond laser driven plasma accelerator journal August 2019
All-laser-driven Thomson X-ray sources journal March 2015
Applications of laser wakefield accelerator-based light sources journal September 2016
Controlled generation of comb-like electron beams in plasma channels for polychromatic inverse Thomson γ -ray sources journal February 2016
Effects of laser polarization and wavelength on hybrid laser wakefield and direct acceleration journal August 2018
Inverse Compton scattering x-ray source from laser electron accelerator in pure nitrogen with 15 TW laser pulses journal November 2018
Optimal parameters for radiation reaction experiments journal June 2019
All-optical generation of petawatt gamma radiation via inverse Compton scattering from laser interaction with tube target journal June 2019
Optically controlled laser–plasma electron accelerator for compact gamma-ray sources journal February 2018
Highly efficient laser-driven Compton gamma-ray source journal January 2019
Experimental Evidence of Radiation Reaction in the Collision of a High-Intensity Laser Pulse with a Laser-Wakefield Accelerated Electron Beam journal February 2018
Experimental Evidence of Radiation Reaction in the Collision of a High-Intensity Laser Pulse with a Laser-Wakefield Accelerated Electron Beam text January 2018
Self-aligning concave relativistic plasma mirror with adjustable focus text January 2016
Highly efficient laser-driven Compton gamma-ray source text January 2018
The X-Ray Emission Effectiveness of Plasma Mirrors: Reexamining Power-Law Scaling for Relativistic High-Order Harmonic Generation journal March 2020

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