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Title: Absolute energy calibration for relativistic electron beams with pointing instability from a laser-plasma accelerator

Abstract

The pointing instability of energetic electron beams generated from a laser-driven accelerator can cause a serious error in measuring the electron spectrum with a magnetic spectrometer. In order to determine a correct electron spectrum, the pointing angle of an electron beam incident on the spectrometer should be exactly defined. Here, we present a method for absolutely calibrating the electron spectrum by monitoring the pointing angle using a scintillating screen installed in front of a permanent dipole magnet. The ambiguous electron energy due to the pointing instability is corrected by the numerical and analytical calculations based on the relativistic equation of electron motion. It is also possible to estimate the energy spread of the electron beam and determine the energy resolution of the spectrometer using the beam divergence angle that is simultaneously measured on the screen. The calibration method with direct measurement of the spatial profile of an incident electron beam has a simple experimental layout and presents the full range of spatial and spectral information of the electron beams with energies of multi-hundred MeV level, despite the limited energy resolution of the simple electron spectrometer.

Authors:
; ; ; ; ; ;  [1]
  1. Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 500-712 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22093622
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 83; Journal Issue: 6; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCELERATORS; CALIBRATION; DIPOLES; ELECTRON BEAMS; ELECTRON SPECTRA; ELECTRON SPECTROMETERS; ENERGY RESOLUTION; ERRORS; INSTABILITY; LASER-PRODUCED PLASMA; MAGNETIC SPECTROMETERS; MAGNETS; MEV RANGE 100-1000; PLASMA GUNS; RELATIVISTIC RANGE; TAIL ELECTRONS

Citation Formats

Cha, H. J., Choi, I. W., Kim, H. T., Kim, I J., Nam, K. H., Jeong, T. M., and Lee, J. Absolute energy calibration for relativistic electron beams with pointing instability from a laser-plasma accelerator. United States: N. p., 2012. Web. doi:10.1063/1.4725530.
Cha, H. J., Choi, I. W., Kim, H. T., Kim, I J., Nam, K. H., Jeong, T. M., & Lee, J. Absolute energy calibration for relativistic electron beams with pointing instability from a laser-plasma accelerator. United States. doi:10.1063/1.4725530.
Cha, H. J., Choi, I. W., Kim, H. T., Kim, I J., Nam, K. H., Jeong, T. M., and Lee, J. Fri . "Absolute energy calibration for relativistic electron beams with pointing instability from a laser-plasma accelerator". United States. doi:10.1063/1.4725530.
@article{osti_22093622,
title = {Absolute energy calibration for relativistic electron beams with pointing instability from a laser-plasma accelerator},
author = {Cha, H. J. and Choi, I. W. and Kim, H. T. and Kim, I J. and Nam, K. H. and Jeong, T. M. and Lee, J.},
abstractNote = {The pointing instability of energetic electron beams generated from a laser-driven accelerator can cause a serious error in measuring the electron spectrum with a magnetic spectrometer. In order to determine a correct electron spectrum, the pointing angle of an electron beam incident on the spectrometer should be exactly defined. Here, we present a method for absolutely calibrating the electron spectrum by monitoring the pointing angle using a scintillating screen installed in front of a permanent dipole magnet. The ambiguous electron energy due to the pointing instability is corrected by the numerical and analytical calculations based on the relativistic equation of electron motion. It is also possible to estimate the energy spread of the electron beam and determine the energy resolution of the spectrometer using the beam divergence angle that is simultaneously measured on the screen. The calibration method with direct measurement of the spatial profile of an incident electron beam has a simple experimental layout and presents the full range of spatial and spectral information of the electron beams with energies of multi-hundred MeV level, despite the limited energy resolution of the simple electron spectrometer.},
doi = {10.1063/1.4725530},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 6,
volume = 83,
place = {United States},
year = {2012},
month = {6}
}