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Collimator scattering at JLab - link

Pre-NLCTA beam test slides from Pelle - link

Summary of results from beam test from Pelle - link

Sensor probing results in lab - link

Calibration and lab tests after pulling wirebonds from Omar - link

Simulation of beam parameters

Beam loss scenario with silicon edge hit

Intensity "per strip" (60um wide bands): 150um or 500um sigma beam spot, 50um or 500um Be exit window, 10cm or 30cm downstream of exit, Air included

10pC:

Image AddedImage Added

100pC:

Image AddedImage AddedImage AddedImage AddedImage Added

Beam spot for one of them as example:

Image Added

 

Beam loss scenario with direct hit

Beam parameters - 500um beam spot - 177cm & 6 foils

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Beam parameters - 150um beam spot

Operation

Data

NLCTA runs:

/u1/software/daq/baseline_XpC_YF_ZV_HHMM.bin

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Calibration:
180V bias: /u1/data/SVT2014/half_module/gimp_lab_postnlcta/1/
220V bias: /u1/data/SVT2014/half_module/gimp_lab_postnlcta/2/

Log book

10/2/13

We observed that there was a new channel that had high noise after installation. It was not there during test with the source. Could be dust or a real pin hole

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10:37
Move in foils one by one and observe beam spot on phosphor screen. Picture and extracted spot size at each thickness can be seen below. The screen is about 75cm downstream of the exit window.

# foils

Tiff

FWHM

0

13PS31_20131002_104735_015-noFoils.tif
Image Added

 

1

13PS31_20131002_104527_012-1foil.tif
Image Added

 

2

13PS31_20131002_104452_011-2foils.tif
Image Added

 

3

13PS31_20131002_104430_010-3foils.tif
Image Added

 

4

13PS31_20131002_104356_009-4foils.tif
Image Added

 

5

13PS31_20131002_104325_008-5foils.tif
Image Added

 

6

 

7

 

We should check if we can extract the beam spot size on the Be window from this data and ask Mike if it's consistent with his experience.

13PS31_20131002_104029_007-6foils.tif
Image Added

 

10:49
Lower bunch charge.
Insert 6 foils.
Still possible to see the beam on the phosphor screen but barely.
Mike estimates this to be order of 1fC/bunch.

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Runs taken, all at 6 foils:

Time

Bunch charge (pC)

ADC1

Bias (V)

Ileak (uA)

~11:00

?~0.001

-

180

10

11:36

1.0

0.002

180

17

 

1.0

0.002

250

22

 

1.0

0.002

350

22

 

1

0.002

400

38

 

1

0.002

500

21

12:00

10

0.01

180

6

 

10

0.01

350

7

 

10

0.01

500

50

 

100

0.135

180

7

 

100

0.135

250

6

 

100

0.135

350

14

11:36
Everything looks ok for 1pC setting.

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Baseline taken at 180V, after irradiating with 100 pC at 350V:

10/3/13

Baseline taken at 180V in group C:

Operation

DAQ Desktop Setup

IP address: 172.27.244.72

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Keithley 2400

Manual
Serial: 9600 8N1

Wiki MarkupCommon commands:
"measure?" - returns \ [voltage, current, \ ]
"source:voltage?" - returns voltage
"source:voltage 10" - set to 10 V
"output on" - output on
"output?" - returns 1 for on, 0 for off
"source:voltage:range up/down" - change range for voltage setting

BK Precision 1697

Manual
Serial:

Common commands:
"SOUT000" - enable output
"SOUT001" - disable output
"VOLT00XY.Z" - sets voltage to XY.Z Volts

Pictures

Image Added Image Added Image Added Image Added Image Added

Lab prep

GIMP current vs bias

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