Phase stability of a microtron driving a terahertz FEL

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The phase stability of bunches accelerated by a magnetron-driven microtron-injector of a terahertz Free Electron Laser (FEL) has been studied to optimize the microtron regimes providing good operation of the FEL. The study is based on a simulation of the beam dynamics in the microtron considering 2-D motion of the electrons in the median plane. This allows the computation of the current loading the accelerating cavity as well as the output microtron current. The loading current has been used to calculate the frequency deviations caused by the incremental loading in the accelerating cavity coupled with the magnetron. Further computations using ... continued below

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4 pages

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Kazakevich, Grigory M.; /Fermilab; Pavlov, Viatcheslav M.; /Novosibirsk, IYF; Jeong, Young Uk; Lee, Byung Cheol et al. August 1, 2008.

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Description

The phase stability of bunches accelerated by a magnetron-driven microtron-injector of a terahertz Free Electron Laser (FEL) has been studied to optimize the microtron regimes providing good operation of the FEL. The study is based on a simulation of the beam dynamics in the microtron considering 2-D motion of the electrons in the median plane. This allows the computation of the current loading the accelerating cavity as well as the output microtron current. The loading current has been used to calculate the frequency deviations caused by the incremental loading in the accelerating cavity coupled with the magnetron. Further computations using the 2-D simulation show noticeable phase oscillation of the accelerated bunch leaving the microtron on the macro-pulse front. The phase oscillation is in agreement with the measured one and affects the lasing in the microtron-based FEL. Optimization of the microtron regimes allows one to minimize the effect. As a result, the terahertz microtron-based FEL provides radiated macro-pulse energy up to 0.2 mJ tunable in the range of 0.85-3 THz with good stability. Results of the simulation and the measurements are presented in this article.

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4 pages

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  • Report No.: FERMILAB-CONF-08-262-AD
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 936887
  • Archival Resource Key: ark:/67531/metadc893618

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • August 1, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 6, 2016, 3:58 p.m.

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Kazakevich, Grigory M.; /Fermilab; Pavlov, Viatcheslav M.; /Novosibirsk, IYF; Jeong, Young Uk; Lee, Byung Cheol et al. Phase stability of a microtron driving a terahertz FEL, article, August 1, 2008; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc893618/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.