Optimization of Beam Injection Into the First Accelerating Module at TTF With Cavity Dipole Mode Signals

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The TESLA Test Facility (TTF) is a user facility for intense VUV-FEL light. The facility is densely equipped with diagnostics, essential in obtaining the necessary beam parameters, in particular the low emittance. However there is no dedicated component for alignment of the beam in the accelerating modules, each containing eight superconducting cavities. Large beam offsets can lead to an increase of the beam emittance. The centering of the beam in these modules is therefore important, mostly at the low energy end. A misalignment of the first TTF module with respect to the gun axis has already been observed using cavity ... continued below

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3 pages

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Baboi, N.; Kreps, G.; Schlarb, H.; Wendt, M.; Frisch, J.; McCormick, D. et al. April 10, 2006.

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Description

The TESLA Test Facility (TTF) is a user facility for intense VUV-FEL light. The facility is densely equipped with diagnostics, essential in obtaining the necessary beam parameters, in particular the low emittance. However there is no dedicated component for alignment of the beam in the accelerating modules, each containing eight superconducting cavities. Large beam offsets can lead to an increase of the beam emittance. The centering of the beam in these modules is therefore important, mostly at the low energy end. A misalignment of the first TTF module with respect to the gun axis has already been observed using cavity dipole modes. This paper presents the experimental results of the optimization of the beam injection into the first module, based on the monitoring of dipole modes through the couplers installed for wakefield damping. For this we use a spectrum analyzer together with a multiplexer. By scanning the beam position and tilt with two pairs of steerers, we can find the trajectory which minimizes the dipole modes amplitude. The impact of the beam steering in the module on the beam is discussed. A time domain setup is also being presented.

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3 pages

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  • Prepared for 7th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators (DIPAC 2005), Lyon, France, 6-8 Jun 2005

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  • Report No.: SLAC-PUB-11808
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 881124
  • Archival Resource Key: ark:/67531/metadc873919

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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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  • April 10, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Aug. 1, 2017, 12:32 p.m.

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Baboi, N.; Kreps, G.; Schlarb, H.; Wendt, M.; Frisch, J.; McCormick, D. et al. Optimization of Beam Injection Into the First Accelerating Module at TTF With Cavity Dipole Mode Signals, article, April 10, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc873919/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.