Investigation of Microwave Instability on Electron Storage Ring TLS

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With the planned installation of a superconducting rf system, the new operation mode of TLS, the electron storage ring at NSRRC, is expected to double the beam intensity. Several accelerator physics topics need to be examined. Beam instability of single-bunch longitudinal microwave instability is one of these topics. We consider two approaches to measure the effective broad band impedance. We compare these measurement results with each other and to old data [Ref.1]. We calculate the threshold current of microwave instability with a mode-mixing analysis code written by Dr. K. Oide of KEK [Ref.2]. We also develop a multi-particle tracking code ... continued below

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3 pages

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Wang, M.-H. & Chao, A. May 17, 2005.

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With the planned installation of a superconducting rf system, the new operation mode of TLS, the electron storage ring at NSRRC, is expected to double the beam intensity. Several accelerator physics topics need to be examined. Beam instability of single-bunch longitudinal microwave instability is one of these topics. We consider two approaches to measure the effective broad band impedance. We compare these measurement results with each other and to old data [Ref.1]. We calculate the threshold current of microwave instability with a mode-mixing analysis code written by Dr. K. Oide of KEK [Ref.2]. We also develop a multi-particle tracking code to simulate the instability. The results of simulation and measurement are compared and discussed. We conclude that doubling of beam current from 200 mA (1.5 mA/bunch) to 400 mA (3 mA/bunch) will not trigger the microwave instability even without a Landau cavity to lengthen the bunch. The benefit of Landau cavity is mainly for beam life time.

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3 pages

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  • Presented at the 9th European Particle Accelerator Conference (EPAC 2004), Lucerne, Switzerland, 5-9 Jul 2004

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  • Report No.: SLAC-PUB-11223
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 890852
  • Archival Resource Key: ark:/67531/metadc884286

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

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  • May 17, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 5, 2016, 9:44 p.m.

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Wang, M.-H. & Chao, A. Investigation of Microwave Instability on Electron Storage Ring TLS, article, May 17, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc884286/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.