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ToF system » History » Version 10

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Aidan Medcalf, 06/11/2019 11:10 AM


ToF system

Voltage settings

Detector     | Voltage
-------------+-----------
DS1          | 899 V 
DS2          | 896 V 
DS3          | 868 V 
DS4          | 916 V 
-------------+-----------
US5          | 808 V
US6          | 799 V
US7          | 855 V
US8          | 813 V
-------------+-----------

The nominal ToF PMT voltages are -900V and SiPM voltages are -29V (bias) and +5V (opamp).

The PMT voltages are supplies by a power supply at -1000V with a cow subtracting (adding) 100V for each channel to arrive at -900V. This allows for tuning down the road.

The SiPM voltages are supplied by a (EHS 8001n_106) LV power supply sitting in a VME crate.

The PMT voltages and SiPM board supplies are turned on by hand. The SiPM bias voltage is configured through the VNC crate.

ssh -Y
. power-on-SiPM.sh

To keep an eye on voltages and currents, open a VNC session:

ssh -L 5943:localhost:5953 -N -f -l novacr03 novadaq-test-master.fnal.gov

If the VNC session on novadaq-test-master.fnal.gov is not already displaying the SiPM voltages, point a browser to:

http://10.226.15.16/

Dimensions:
US (PMT) - 0.79" x 5.91" x 5.91", then UVT PMMA light guides tapered to 0.79" x 0.79" with light detector glued
DS (PMT) - 0.24" x 5.91" x 5.91", cut at corners with light detector glued
DS (SiPM) - 0.52" x 5.91" x 5.91", cut at corners with light detector glued
EJ-232Q-0.5% Fast Timing Plastic Scintillator

In progress: ToF_system_samplecode