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ToF system » History » Version 65

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John Rabaey, 10/10/2019 10:36 PM


ToF system

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
(Scintillator is oriented as a diamond; light guides are glued to the edges)
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
US and DS - Hamamatsu H11934-200 (https://www.hamamatsu.com/resources/pdf/etd/R11265U_H11934_TPMH1336E.pdf)

Analysis

In progress: ToF_system_samplecode

Layout

(Numbers are consistent with cable labels, not digitizer channels.)
Looking with the beam (north):

US
1-----2
|     |
|     |
4-----3

DS
4-----1
|     |
|     |
3-----2

DS SiPM
8-----5
|     |
|     |
7-----6

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 (DS) and -820V (US) 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 novadaq@novadaq-test-master.fnal.gov
. power-on-SiPM.sh
. power-off-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/

Cable delays

These delays are calculated from the mean of the dt distributions between channels 8 and 9, 8 and 10, 8 and 11, and similarly for the DS TOF,
using data from runs 2961, 2973, 2981, 2984, 2997, 2998, 3005, 3025, and 3026.

Upstream
Channel 8: 0.0000 ns (by definition)
Channel 9: -.3498 ns
Channel 10: 0.2496 ns
Channel 11: 0.7922 ns

Downstream
Channel 12: 0.0000 ns (by definition)
Channel 13: 0.2983 ns
Channel 14: -.1675 ns
Channel 15: -.1817 ns

SiPM
Channel 4: 0.0000 ns (by definition)
Channel 5: -.06134 ns
Channel 6: -0.3689 ns
Channel 7: -0.2508 ns

Calibration Data

ToF Calibration Data