The first system integrations tests took place in 1-216 on November 22-27, 2000.
Two reference PMT's were in the temperature control box, each viewing one fiber bundle and
one YAlO source. One fiber from each bundle also illuminated an RS PMT in a separate black
box. The temperature of the LED driver box, the voltage of the LED driver source and the HV
of the Ref PMT's were all monitored in a scanning ADC. The output of the two reference PMT's
and the two RS PMT's were monitored in an LRS2248 ADC.
Only one thermocuple was available, so the temperature of the Ref PMT and RS PMT boxes were
not monitored. The voltage outputs of the temperature control boxes are not connected (Tadashi will enquire about an after-the-fact upgrade.), this means that we do need thermocoupels in each box.
Conclusions:
- The light outputs to the reference and RS PMTs are about as expected.
- The 16-bit scanning ADC (JOR1616) and temperature box were both stable at ~0.1 C.
- The YAlO light output showed large variations compared to all other parts of the system.
- The HV is anti-correlated witht he YAlO output, but not the LED output
- The LED output on RS2 was more stable than on the Reference PMTs,
- The LED and YAlO output on Ref1 and the LED output on Ref2 all declined by ~1-2% over 3 days, but the YAlO output on Ref2 did not. The driver voltage increase by 10mV over this time.
- The LED driver voltage has an anti-correlation with temperature; which is the same
direction as the driver circuit itself.
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The next set of tests will include all 12 Reference PMTs; a new reference PMT HV distribution and monitoring system; additional thermocouples; the full RS/BV/BVL which is hopefully light-tight.