Beam Based HOM Analysis of Accelerating Structures at the TESLA Test Facility Linac

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The beam emittance in future linear accelerators for high energy physics and SASE-FEL applications depends highly on the field performance in the accelerating structures, i.e. the damping of higher order modes (HOM). Besides theoretical and laboratory analysis, a beam based analysis technique was established [1] at the TESLA Test Facility (TTF) linac. It uses a charge modulated beam of variable modulation frequency to excite dipole modes. This causes a modulation of the transverse beam displacement, which is observed at a downstream BPM and associated with a direct analysis of the modes at the HOM-couplers. A brief introduction of eigenmodes of ... continued below

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4 pages

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Wendt, M.; Schreiber, S.; Castro, P.; Gossel, A.; /DESY; Huning, M. et al. August 9, 2005.

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Description

The beam emittance in future linear accelerators for high energy physics and SASE-FEL applications depends highly on the field performance in the accelerating structures, i.e. the damping of higher order modes (HOM). Besides theoretical and laboratory analysis, a beam based analysis technique was established [1] at the TESLA Test Facility (TTF) linac. It uses a charge modulated beam of variable modulation frequency to excite dipole modes. This causes a modulation of the transverse beam displacement, which is observed at a downstream BPM and associated with a direct analysis of the modes at the HOM-couplers. A brief introduction of eigenmodes of a resonator and the concept of the wake potential is given. Emphasis is put on beam instrumentation and signal analysis aspects, required for this beam based HOM measurement technique.

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4 pages

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  • Prepared for 6th European Workshop on Beam Diagnostic and Instrumentation for Particle Accelerators (DIPAC 2003), Mainz, Germany, 5-7 May 2003

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  • Report No.: SLAC-PUB-11399
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 878799
  • Archival Resource Key: ark:/67531/metadc880597

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  • August 9, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 8:36 p.m.

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Wendt, M.; Schreiber, S.; Castro, P.; Gossel, A.; /DESY; Huning, M. et al. Beam Based HOM Analysis of Accelerating Structures at the TESLA Test Facility Linac, article, August 9, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc880597/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.