A Checkout of the Beam-Line's Beam Position Measurement Systems Page: 2 of 4
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P1 beam-line BPMs there are some more factors that have been used as in bpmuti.c. See Pbar note 659 for
further comments about the scaling used for the APx beam-line BPMs.
AP3 BPM Electrical Offsets
42
w . U-2
905
910
915
BPM-4
900Uf
920
925
930
+ Horizontal (cables) Vertical (cables)
Horizontal (plates)
Vertical (plates)
Figure 1: AP3 Electrical Offsets due to the cable runs and pick-up plate differences.
AP2 BPM Electrical Offsets-U-
1 +E m" *u*-, *Em
- 0 " " U710
^
- "." .+
720
730
BPM
+ Horizontal (cables) - Vertical (cables)
Horizontal (plates)
Vertical (plates)
Figure 2: AP2 Electrical Offsets due to the cable runs and pick-up plate differences.
Offsets
The position offsets, electrical offset and plate impedance differences, are shown in figures 1-4 for
the AP3, AP2, API and P2 beam-lines; due to the different BPM types in P2 and the variety of impedance
values, no P2 plate impedance results are shown. The offsets determined by plate impedance differences
are comparable to the expected millimeter resolution. Most of the cable runs' electrical offsets are alsoE
m1
0,4
2E
O0
-2-4 4-
700
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Gollwitzer, Keith. A Checkout of the Beam-Line's Beam Position Measurement Systems, report, March 15, 2001; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1012511/m1/2/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.