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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/32027597
Record Status
Checked
Record Id
32027597
Title
Computing Bunch Charge, Position, and BPM Resolution in Turn-by-Turn EMMA BPMs
Contributors
A Kalinin (STFC Daresbury Lab.) (Pr.Au.)
,
JK Jones (STFC Daresbury Lab.)
,
RG Borrell (WareWorks Ltd., Manchester)
,
G Cox (STFC Daresbury Lab.)
,
DJ Kelliher (STFC Rutherford Appleton Lab.)
,
S Machida (STFC Rutherford Appleton Lab.)
,
IW Kirkman (Cockcroft Inst.)
Abstract
The NS-FFAG electron model ‘EMMA’ and its Injection and Extraction Lines are equipped with a total of 53 EPICS VME BPMs*. In the BPMs, each opposite button signal pair is time-domain-multiplexed into one channel as a pulse doublet. The recording of turn-by-turn data into the BPM memory is triggered by the bunch itself on each of its passages. For each accelerating cycle, the BPMs deliver a snapshot of a turn-by-turn trajectory measured in each of 42 cells. Additional BPMs (two pairs) are used to obtain a Poincare map. We describe the EPICS architecture, and a set of Python data processing algorithms that are used to automatically set a BPM intensity range, to eliminate an error due to tails of the doublet pulses, to calculate the bunch charge and position, and, for a set of injections, to find the BPM resolution. We use three types of button pickup mappings** that allow: to eliminate bunch charge signal dependence on offset, to get a linear offset response, and to eliminate ‘quadrupole’ signal dependence on offset as well (which is used in resolution calculation). We present beam measurement results collected in 2011 runs.
Organisation
ASTeC
,
ASTeC-AP
,
CI
,
STFC
Keywords
ASTeC 2012-2013
,
Physics
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Paper In Conference Proceedings
In 3rd International Particle Accelerator Conference (IPAC'12), New Orleans, Louisiana, USA, 20-25 May 2012, (2012): 924.
http://accelconf.…/papers/moppr061.pdf
2012
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