Paper |
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TUPPR037 |
Simulations of Higher Order Modes in the ACC39 Module of FLASH |
1900 |
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- I.R.R. Shinton, R.M. Jones, P. Zhang
UMAN, Manchester, United Kingdom
- Z. Li
SLAC, Menlo Park, California, USA
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This study is primarily focused on the dipole component of the multiband expansion of the wakefield, with the emphasis being on the development of a HOM-based BPM system for ACC39 currently installed and in operation at FLASH and due to be installed at XFEL . Coupled inter-cavity modes are simulated together with a limited band of trapped modes. A suite of finite element computer codes (including HFSS and ACE3P) and globalised scattering matrix calculations (GSM) are used to investigate the modes in these cavities. In this way the nature of the multi-cavity nature of these modules is investigated with implications for a HOM-based BPM system and direct comparison to experimental results.
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MOPPP069 |
First Measurements of COLDDIAG: A Cold Vacuum Chamber for Diagnostics |
720 |
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- S. Gerstl, T. Baumbach, S. Casalbuoni, A.W. Grau, M. Hagelstein, T. Holubek, D. Saez de Jauregui
Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
- R. Bartolini, M.P. Cox, J.C. Schouten, R.P. Walker
Diamond, Oxfordshire, United Kingdom
- M. Migliorati, B. Spataro
INFN/LNF, Frascati (Roma), Italy
- I.R.R. Shinton
UMAN, Manchester, United Kingdom
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Superconductive insertion devices can reach, for the same gap and period length, higher fields with respect to permanent magnet insertion devices. One of the still open issues for the development of superconductive insertion devices, is the understanding of the heat intake from the electron beam. COLDDIAG, a cold vacuum chamber for diagnostics was designed and built specifically for this purpose. With the equipped instrumentation, which covers temperature sensors, pressure gauges, mass spectrometers as well as retarding field analyzers it is possible to measure the beam heat load, total pressure, gas content as well as the flux of particles hitting the chamber walls. Here we report about the preliminary measurements and results of COLDDIAG installed in the Diamond storage ring.
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