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--- hi:hi:blmservicerecords [2019/09/19 16:55]
p.boutachkov
+++ hi:hi:blmservicerecords [2019/09/25 15:23]
p.boutachkov
@@ Line 1: / Line 1: @@
+====== Calibration ======
+The BLM calibration is performed with a <sup>137</sup>Cs source.
+The source emits a single gamma at 661.7 keV. The source activity was 323.2 kBq as of 11.01.2019. Its serial number is AB-9020, 370 kBq when purchased.
+I have used 10 s integration time and set all BLM to count 30 k. (3 kHz)
+Note on the light yield. Reference Glenn Knoll 3rd edition p.235 and p226 NE102A 10 k photons per MeV. BC400 light output 0.65 of NE102A (anthrscene). Hence one can expect: 6500 photons / keV
+Bellow is a spectrum taken with the HDO6104A scope when for a BLM set to count 3 kHz (in this case XP2972 34391)
+{{:hi:hi:sn34391-137cs-1275v--00000.jpg?700|}}
+====== XP2972 PMT History ======
+CBS - Cathode Blue sensitivity
+ABS - For a anode blue sensitivity
+Id - Dark current
+^ SN ^ CBS [uA/lmF] ^ ABS [A/lmF] ^ HV [V] ^ Id[nA] ^ Gain [10<sup>6</sup>] ^ Comment ^
+| 34391 | 12.6 | 10 | 1188 | 4.98 | 0.79 | new, will be installed in TE1 |
+| 29181 |  |  | |  |  | used, low gain, was in S07DL1R |
 ====== GS06DL3U ======
 Reason for the service: The detector counts more than 10 times compare to the detectors above, left and right of it.
@@ Line 19: / Line 40: @@
     * No yellowing, signs of mechanical damage on the surface.
     * Under UV, no spots
-The Standard operating voyage is 1100 V, I<sub>l</sub> = 739 uA, counting rate bellow 5 Hz
+The Standard operating voltage is 1100 V, I<sub>l</sub> = 739 uA, counting rate bellow 5 Hz

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