ESS Docs Document 327-v5

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Dynamics of Bunches Partially Chopped with the Mebt Chopper in the ESS Linac

Document #:
ESS-doc-327-v5
Document type:
Tech Note
Submitted by:
Ryoichi Miyamoto
Updated by:
Ryoichi Miyamoto
Document Created:
01 Apr 2014, 18:24
Contents Revised:
04 Jun 2014, 12:04
Metadata Revised:
04 Jun 2014, 12:04
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Other Versions:
ESS-doc-327-v4
04 Jun 2014, 12:01
ESS-doc-327-v3
07 May 2014, 22:33
ESS-doc-327-v2
07 May 2014, 14:02
ESS-doc-327-v1
01 Apr 2014, 18:24
Abstract:
The front-end of a hadron linac typically has a transient time during turning on and off and bunches in the head and tail of a pulse from this period likely have wrong parameters and a risk to cause beam losses. A risk of losses must be avoided as possible in a high power machine so these bunches are removed with deflectors called choppers in the ESS Linac. From experiences of other machines, a rise time of a chopper as fast as one RF period (2.84~ns for ESS) is challenging to achieve and not necessarily needed with no ring to inject like ESS, and hence a 10~ns rise time is planned for a chopper in the medium energy beam transport of ESS. This, however, means that several bunches receive intermediate deflections and may propagate with large trajectory excursions. This paper studies dynamics of such partially chopped bunches in detail to ensure no significant loss is caused by them.
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Keywords:
MEBT chopper
Notes and Changes:

- ESS AD Technical Note ESS/AD/0054

- Will be submitted to Linac'14.

Associated with Events:
LINAC14 held on 31 Aug 2014
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