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Test Beam VPT II

“H4 test beam meeting” June 23rd 2004 / Patrice VERRECCHIA

Second Irradiation (June 14th to 21st )

A Laser Monitoring Analysis

First Irradiation (June 4th to 8th )

Recovery followed by Laser

VPT flashed continuously by laser at 100Hz

E0’ matrix


Round #2

• Rawz files sent to Monitoring farm prototype• Quality control• Corrections:

– non linearity– Test pulses (mgpa and mem)– Laser Width

• MATACQ ready for use– Temperature (delayed)

• Irradiation & Calibration Analysis– Hodoscope not used

Data treatment


Quasi Real Time

Laser intensity control


During irradiation #2

Start irradiation

6%

Laser width control


During irradiation #2

Irradiation & recovery XTAL #21


BCTP

Chan#4

R slope: XTAL #21


BCTP

Chan#4



SIC

Chan#20

R slope: XTAL #5


SIC

Chan#20



SIC

Chan#1

R slope: XTAL #24


SIC

Chan#1



SIC

Chan#10

R slope: XTAL #15


SIC

Chan#10



SIC

Chan#9

R slope: XTAL #20


SIC

Chan#9



SIC

Chan#12

R slope: XTAL #13


SIC

Chan#12



SIC

Chan#22

R slope: XTAL #3


SIC

Chan#22



BCTP

Chan#13

R slope: XTAL #12


BCTP

Summary


R measurements

XTal # Channel# Total dose Loss (e-)

21 4 9.5 6% 1.56

12 13 2.8 2.6% 1.58

5 20 4.8 5% 1.08

24 1 7.5 4% 1.0

15 10 4.9 2% 1.

20 9 5.1 3.5% 1.

13 12 5.2 8.5% 1.

3 22 3.1 7% 1.04

Loss e- versus dose


XTal#21XTal#5

XTal#24XTal#15

Neighbour XTALS


R measurements

XTal # Channel# Total dose Loss (e-)

18 7 ? 1% 0.7

8 17 ? 1.5% 0.95

14 11 ? 1% 0.85


Dispersion of

Conclusions


Bogo Crystals have fully recovered the first irradiation

Irradiation#1 similar to irradiation#2 (offsets to be understand)

SIC Crystals recover very slowly

Mismatch Laser/Electron during recovery

Drop (Irradiation#2) < Drop ( irradiation#1)

XTAL#15

~ 1.0

Dispersion = 11% (compare to 6% for bogo)OK