ESS Docs Document 298-v1

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Field Stability Issue for Normal Conducting Cavity under Beam Loading

Document #:
ESS-doc-298-v1
Document type:
Tech Note
Submitted by:
Rihua Zeng
Updated by:
Rihua Zeng
Document Created:
28 Aug 2013, 10:08
Contents Revised:
28 Aug 2013, 10:08
Metadata Revised:
28 Aug 2013, 10:08
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Abstract:
There is cavity field ‘blip’ at the beginning of beam loading (~several ten micro-seconds)
under PI control feedback for normal conducting cavities. It occurs even if cavity field
amplitude and phase are set carefully to the same nominal values before beam coming.
The solution to this problem is to adjust the beam injection time, having the beam
injected before the cavity field gets constant and cancelling each other the voltages
induced by beam and induced by generator current. In the case of beam injection time
unable to adjust, feedforward compensation for corresponding beam mode helps solve the
problem.
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