1

BPM status

Pengjia Zhu

2013.8.28

2

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

3

3.13 bpm calibration setting:autogaindidn't subtract pedestal

4

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

5

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

6

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

7

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

8

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

9

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

10

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

11

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

13

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

14

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

15

bpm rotation --- correct

16