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A high resolution, broad energy acceptance spectrometer for laser wakefield acceleration experiments

Source: Rev. Sci. Instrum. 81, 073304 (2010); doi:10.1063/1.3458013

Published 21 July 2010

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ISSN:
1553-9601 (online)
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AIP is a member of CrossRef AIP
Christopher M. S. Sears,1 Sofia Benavides Cuevas,1 Ulrich Schramm,1,2 Karl Schmid,1,3 Alexander Buck,1,3 Dieter Habs,1,3 Ferenc Krausz,1,3 and Laszlo Veisz1
1Max-Planck-Institüt für Quantenoptik, 85748 Garching bei München, Germany
2Forschungszentrum Dresden-Rossendorf, 01328 Dresden, Germany
3Fakultät für Physik, Ludwig-Maximilians-Universität München, 85748 Garching bei München, Germany
Laser wakefield experiments present a unique challenge in measuring the resulting electron energy properties due to the large energy range of interest, typically several 100 MeV, and the large electron beam divergence and pointing jitter >1  mrad. In many experiments the energy resolution and accuracy are limited by the convolved transverse spot size and pointing jitter of the beam. In this paper we present an electron energy spectrometer consisting of two magnets designed specifically for laser wakefield experiments. In the primary magnet the field is produced by permanent magnets. A second optional electromagnet can be used to obtain better resolution for electron energies above 75 MeV. The spectrometer has an acceptance of 2.5–400 MeV (Emax/Emin>100) with a resolution of better than 1% rms for electron energies above 25 MeV. This high resolution is achieved by refocusing electrons in the energy plane and without any postprocessing image deconvolution. Finally, the spectrometer employs two complimentary detection mechanisms: (1) absolutely calibrated scintillation screens imaged by cameras outside the vacuum chamber and (2) an array of scintillating fibers coupled to a low-noise charge-coupled device. ©2010 American Institute of Physics
History: Received 22 January 2010; accepted 8 June 2010; published 21 July 2010
Permalink: http://link.aip.org/link/?RSINAK/81/073304/1

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