Bob Lill LCLS FAC [email protected] June 16-18, 2008 RF BPM Status and Production Test Results.
BPM status
description
Transcript of BPM status
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BPM status
Pengjia Zhu
2013.8.28
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survey uncertainty caused bpm uncertainty
1. position survey ~ 0.15 mm
2. angle survey ~ 0.0001 deg
3. harp wire survey ~ 0.15 mm
4. harp scan minumum step ~ 0.07 mm
position uncertainty at bpm -> 0.25 mm
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3.13 bpm calibration setting:autogaindidn't subtract pedestal
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timeline
3.13 3.14 3.173.9 3.273.6
auto gain fixed gain
straightthrough
2.5T90 deg
2.5T90 deg
5T6 deg
septumfired
3.292.5T90 deg
3.13 calibration constant covered
2.257GeV
3.14 straight through harp scan
3.16 2.5T harp scan
3.12 5T harp scan
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timeline
3.13 3.14 3.173.9 3.273.6straightthrough
2.5T90 deg
2.5T90 deg
5T6 deg
septumfired
3.292.5T90 deg
2.257GeV3.14 straight through harp scan(100nA)
BPM A BPM B
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3.13 3.14 3.173.9 3.273.6straightthrough
2.5T90 deg
2.5T90 deg
5T6 deg
septumfired
3.292.5T90 deg
2.257GeV
10 mm carbon hole->16.1 mm raster size->~15.3 mm at BPM A
3.16 run 3217 C12 hole check
using 3.14 constantLet's focus on BPM A first
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3.13 3.14 3.173.9 3.273.6straightthrough
2.5T90 deg
2.5T90 deg
5T6 deg
septumfired
3.292.5T90 deg
2.257GeV3.16 run 3217 C12 hole check
raster shape at BPM A ~15.5mm
using 3.14 constant
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3.13 3.14 3.173.9 3.273.6straightthrough
2.5T90 deg
2.5T90 deg
5T6 deg
septumfired
3.292.5T90 deg
3.17 run 3273 raster size calibration3.13 run 3146 raster size calibration using 3.14 constant
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3.13 3.14 3.173.9 3.273.6straightthrough
2.5T90 deg
2.5T90 deg
5T6 deg
septumfired
3.292.5T90 deg
3.13 run 3146 raster size calibration
BPM A BPM B
Then focus on BPM B
using 3.14 constant
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3.13 3.14 3.173.9 3.273.6straightthrough
2.5T90 deg
2.5T90 deg
5T6 deg
septumfired
3.292.5T90 deg
2.257GeV3.17 run 3273 raster size calibration
BPM A BPM B
BPM B constant destroyed
using 3.14 constant
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timeline
3.13 3.14 3.173.9 3.273.6straightthrough
2.5T90 deg
2.5T90 deg
5T6 deg
septumfired
3.292.5T90 deg
3.16 2.5T harp scan
use BPM A and harp 05 to check BPM B
BPMA BPMB
harp 05
-940.5mm -676.5mm-814.3mm
if +-0.1mm in BPMA +-0.1mm in harp--> +-0.24mm in BPMB
2.5T will bend beam 0.1mm
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x
hall coor
y
hall coor
x
local coor
y
local coor
BPM A -1.24 -95.88 -1.98 2.07
Harp 05 -1.49 -81.33 -2.39 1.27
BPM B
transported
from A and harp 05
-1.77 -65.44 -2.82 4.08
BPM B
use 3.14 const
0.86 -67.67 -0.19 1.86
x
hall coor
y
hall coor
x
local coor
y
local coor
BPM A 0.44 -95.33 -0.31 2.62
Harp 05 0.41 -81.22 -0.49 1.37
BPM B
transported
from A and harp 05
0.38 -65.82 -0.66 3.70
BPM B
use 3.14 const
1.77 -67.57 0.73 1.95
incorrect BPM B constant
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timeline
3.13 3.14 3.173.9 3.273.6straightthrough
2.5T90 deg
2.5T90 deg
5T6 deg
septumfired
3.292.5T90 deg
3.12 5T harp scan
will update soon
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timeline
3.13 3.14 3.173.9 3.273.6straightthrough
2.5T90 deg
2.5T90 deg
5T6 deg
septumfired
3.292.5T90 deg
div=2 for A and Bdiv=4 for A and B
different div setting caused BPM B constant changedbut not affect BPM A
don't have enough harp data for div=2will try to find a way to fix it
also need to find a way to get bpm resolution
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bpm rotation --- correct
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