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| − | == Event Log ==
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| − | === 2010 Mar 17 ===
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| − | * Photos of SiPM test setup.
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| − | [[Image:SiPM_test_overall.jpg|thumb|200px|left|Location of the SiPM Box]]
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| − | [[Image:SiPM_test_close.jpg|thumb|300px|left|Close view of SiPM test setup]]
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| − | [[Image:SiPM_test_hall.jpg|thumb|300px|left|Distance between SiPM and Hall A Target]]
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| − | <br clear=all>
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| − |
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| − | * All Hardware intrustruments have been connected.
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| − | * The SiPM box is put on top of the cryo target parking support which is at about '''135 degrees''' to the left side of the beam and '''20 meters''' away from the target.
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| − | * The real time neutron counter is put right next to the SiPM.
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| − | === 2010 Mar 18 ===
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| − | * Have all the remote communication working properly.
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| − | * Other than the oscilloscope, Labview programs to all the rest devices are ready.
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| − | * Did first measurement of the correlation between the draw current and the bias voltage.
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| − | [[Image:20100318_065900_Hamamatsu.png|thumb|200px|left|Hamamatsu SiPM Draw Current vs Bias Voltage]]
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| − | [[Image:20100318_070500_SensL.png|thumb|200px|left|SensL SiPM Draw Current vs Bias Voltage]]
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| − | <br clear=all>
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| − | * Signals on Oscilloscope with 70.5V on Hamamatsu and 28.5V on SensL are shown as well.
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| − | [[Image:20100318_Signal_705_285.png|thumb|200px|left|Signals on Oscilloscope with 70.5V on Hamamatsu and 28.5V on SensL]]
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| − | <br clear=all>
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| − | === 2010 Mar 19 ===
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| − | * Finished Oscilloscope initialization program, the readback program is done as well but not quite stable
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| − | * Increase the pulse frequency to 1.0 kHz, here is the '''final configuration''' for the pulse generator
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| − | * Direct DC couple to the LED
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| − | * Frequency: 1.0 kHz
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| − | * Width: 8.0 ns
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| − | * High Level: 5.0 V
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| − | * Low Level: 0.0 V
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| − |
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| − | * Tested the draw current corresponding to the voltage level and recorded the oscilloscope signals (average of 128 waveforms)
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| − | * Removed both SiPMs from the box for Hall closing.
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| − |
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| − | * SiPM signal shape vs bias voltage
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| − | [[Image:hamamatsu_signal.png|thumb|left|200px|Signal shapes from Hamamatsu SiPM with different bias voltage.]]
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| − | [[Image:sensl_signal.png|thumb|left|200px|Signal shapes from SensL SiPM with different bias voltage.]]
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| − | <br clear=all>
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| − |
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| − | * Draw current vs bias voltage
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| − | [[Image:hamamatsu_vi.png|thumb|left|200px|Hamamatsu SiPM draw current as a function of bias voltage.]]
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| − | [[Image:sensl_vi.png|thumb|left|200px|SensL SiPM draw current as a function of bias voltage.]]
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| − | <br clear=all>
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| − |
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| − | * SiPM signal amplitude vs draw current as a function of bias voltage. From the plots, we can have some sense of the signal to background ratio.
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| − | [[Image:sipm_scv.png|400px|The ratio of amplitude to draw current as a function of bias voltage.]]
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| − | <br clear=all>
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| − | === 2010 Mar 21 ===
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| − | * Finished first version of the Central Control VI, change all serial communication timeout to be 1 second
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| − | * Stress test
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| − | === 2010 Mar 22 ===
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| − | * Stress test failed, system won't run VI after rebooting. Maybe it's time to rebuilt the XP system on the computer
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| − | === 2010 Mar 23 ===
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| − | * Brought transversity.jlab.org to CC for a system rebuilt
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| − | * At the mean time, upgraded the Central Control VI to version 2 with a more responsive interface and better timing control.
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| − |
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| − | === 2010 Mar 24 ===
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| − | * CC rebuilt the XP System
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| − | * Installed all necessary software, all devices are up and running well
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| − | * Changed GPIB timeout to be 1 second, should not have any timeout problem
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| − | * Stress test with Central Control VI without writing file to the disk :S
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| − | [[Image:SiPM_VI.png|thumb|left|300px|A screen shot of Central Control VI]]
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| − | <br clear=all>
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| − | === 2010 Mar 25 ===
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| − | * Modified the algorithm to initialize the VISA resource.
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| − | * New stress test passed 30000 readings!!!!
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| − | === 2010 Mar 26 ===
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| − | * AGPIB and DOSCI lost connection at around 12:30AM when MCC tuning beam in the Hall. Rebooting solved the problem. More shielding may be required.
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| − | === 2010 Mar 29 ===
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| − | * Added additional shielding in front of the instruments
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| − | === 2010 Mar 31 ===
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| − | * EPICS readout configured
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| − | === 2010 Apr 1 ===
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| − | * Updated Control VI to v4 with intregrated EPICS readout
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| − | [[Image:sipm_cc_v4.png|thumb|left|300px|The V4 Labview control VI with EPICS variables.]]
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| − | <br clear=all>
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| − |
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| − | === 2010 Apr 5 ===
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| − | * Updated Control VI to v5, new features added
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| − | ** independent readouts from GPIB, Serial and EPICS
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| − | ** added communication status indications
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| − | ** added plot history feature
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| − | === 2010 Apr 6 ===
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| − | * Calibrated RTD temperature sensor using an ice-water mix
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| − | * Offset is 0.185 +- 0.005 degrees
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| − | * Therefore, nominal temperature in Hall A is 21.0 degree, so the bias voltages for two SiPMs are:
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| − | ** 70.33 V for Hamamatsu
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| − | ** 28.62 V for SensL
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| − |
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| − | === 2010 Apr 7 ===
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| − | * Added Temperature Feedback to Bias Voltage
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| − | ** Temperature averaged over 10 minutes, statistical fluctuation < 0.01 degrees
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| − | ** Voltage adjust step: 1 mV
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| − | ** Voltage_Hamamatsu = 70.27 + 0.056*(T-20)
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| − | ** Voltage_SensL = 28.6 + 0.023*(T-20)
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| − | [[Image:sipm_cc_v5.png|thumb|left|300px|The V5 Labview control VI with EPICS variables.]]
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| − | <br clear=all>
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| − | === 2010 Apr 16 ===
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| − | * Hall A finally took the first production run
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| − | === 2010 Apr 18 ===
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| − | * The Hamamatsu power supply lost communication. Could not be fixed through multiple remote reboot. Probably caused by radiation damage :S
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| − | * The neutron dose meter can only read 3 digit, once the reading is over 100000, it won't be very easy to accurately trace the dose, needs to be reset.
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| − | === 2010 Apr 20 ===
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| − | * Neutron probe has been reset
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| − | * Test in Hall A started from 18:00
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| − | === 2010 Apr 22 ===
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| − | * Beam stopped at 09:00
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| − | * Test in Hall A finished at 09:00
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| − | * Draw current: 200 uA for Hamamatsu and 1600 uA for SensL
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| − | * Leave the all the instruments in tunnel with temperature about 21 C
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| − |
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| − | === 2010 May 4 ===
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| − | * Move all the instruments to ARC Room 628 at 15:00
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| − | * Room Temperature at Room 628 is about 22 C
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| − |
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| − | === 2010 May 5 ===
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| − | * Started Annealing test from 18:00 in Room 628
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| − | * Draw current: 135 uA for Hamamatsu and 1120 uA for SensL, both get lowered
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| − |
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| − | === early test data ===
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| − | * 20100318 Pulse Frequency: 500 Hz
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| − | * 20100319 Pulse Frequency: 1.0 kHz
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