| Paper |
Title |
Page |
| WEPMB058 |
LHC Crab Cavity Coupler Test Boxes |
2248 |
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- J.A. Mitchell
Lancaster University, Lancaster, United Kingdom
- R. Apsimon, G. Burt, A.R.J. Tutte
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
- R. Calaga, A. Macpherson, E. Montesinos
CERN, Geneva, Switzerland
- S.D. Silva
ODU, Norfolk, Virginia, USA
- B. P. Xiao
BNL, Upton, Long Island, New York, USA
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The LHC double quarter wave (DQW) crab cavities have two different types of Higher Order Mode (HOM) couplers in addition to a fundamental power coupler (FPC). The FPC requires conditioning, so to achieve this we have designed a radio-frequency (RF) quarter wave resonator to provide high transmission between two opposing FPCs. For the HOM couplers we must ensure that the stop-band filter is positioned at the cavity frequency and that peak transmission occurs at the same frequencies as the strongest HOMs. We have designed two test boxes which preserve the cavity spectral response in order to test the couplers.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-WEPMB058
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| THPOW017 |
VELA Photoinjector Cavity RF Investigations |
3968 |
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- L.S. Cowie, B.L. Militsyn
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
- G. Burt
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
- J.A. Mitchell
Lancaster University, Lancaster, United Kingdom
- M.D. Roper
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
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One of two ALPHA-X photocathode gun cavities, designed and fabricated at the Laboratoire de l'Accélérateur Linéaire, has been in operation on the VELA electron accelerator at Daresbury Laboratory since first beam in April 2013. In this time the maximum beam momentum recorded is 5.06 MeV/c. An investigation of the cavity has been performed with the aim of reconciling the expected momentum of over 6 MeV/c with the measured momentum. RF and beam simulation results are presented along with low power RF measurements of the cavity. One source of momentum loss, the flatness of the cathode face, is identified and rectified.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-THPOW017
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