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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

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10/2/13

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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

 

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

Operation

DAQ Desktop Setup

IP address: 172.27.244.72

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