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Title: Broadband Single-Shot Electron Spectrometer for GeV-Class Laser Plasma Based Accelerators

Laser-plasma-based accelerators can provide electrons over a broad energy range and/or with large momentum spread. The electron beam energy distribution can be controlled via accurate control of laser and plasma properties, and beams with energies ranging from'0.5 to 1000 MeV have been observed. Measuring these energy distributions in a single shot requires the use of a diagnostic with large momentum acceptance and, ideally, sufficient resolution to accurately measure energy spread in the case of narrow energy spread. Such a broadband single-shot electron magnetic spectrometer for GeV-class laser-plasma-based accelerators has been developed at Lawrence Berkeley National Laboratory. A detailed description of the hardware and the design concept is presented, as well as a performance evaluation of the spectrometer. The spectrometer covered electron beam energies raging from 0.01 to 1.1 GeV in a single shot, and enabled the simultaneous measurement of the laser properties at the exit of the accelerator through the use of a sufficiently large pole gap. Based on measured field maps and 3rd-order transport analysis, a few percent-level resolution and determination of the absolute energy were achieved over the entire energy range. Laser-plasma-based accelerator experiments demonstrated the capability of the spectrometer as a diagnostic and its suitability for suchmore » a broadband electron source.« less
Authors:
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Publication Date:
OSTI Identifier:
937448
Report Number(s):
LBNL-971E
Journal ID: ISSN 0034-6748; RSINAK; TRN: US0805787
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 79
Research Org:
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring Org:
Accelerator& Fusion Research Division
Country of Publication:
United States
Language:
English
Subject:
43; ACCELERATORS; DESIGN; ELECTRON BEAMS; ELECTRON SOURCES; ELECTRON SPECTROMETERS; ELECTRONS; ENERGY RANGE; ENERGY SPECTRA; LASERS; MAGNETIC SPECTROMETERS; PERFORMANCE; RESOLUTION; SPECTROMETERS; TRANSPORT laser plasmas accelerator