Proton Calorimetry/Experimental Runs/2018/Oct25-6

Beam tests of the single module with PRaVDA Silicon strip tracker with trigger pulse output at the Birmingham Cyclotron with a 36 MeV beam.

Equipment List

Item	Notes
Single Module Scintillator Block	3cm x 3cm x 5cm standard scintillator block. Optical gel required to couple Scintillator to PMT
Photomultiplier Tube	Hamamatsu R13089 2"
Portable Enclosure	Modified Peli 1510 Waterproof Wheeled Equipment Case. 230 x 555 x 350mm Features mount for scintillator and PMT, opening for beam, and ports for SHV, BNC, and SMA cables. Mylar window with Al support mounted to internal face: approximately light-tight. BNC output from case connected to SMA splitter.
LeCroy HDO6104 Oscilloscope	Records PMT output, connected via SMA-BNC conversion.
Caen DT5751 Digitiser	Records PMT output, connected via SMA-MCX conversion. Used channel 3.
DAQ Laptop	Controls Caen HV supply; records data from Caen digitiser.
Caen NDT1470 HV Supply	Supplies HV to PMT
PRaVDA Strip Tracker	PRaVDA Unit A, 3x150um Si strip sensors with 90.4um strip pitch. Firmware version update to yield square pulse out when 2 or 3 layers have a strip over threshold per read out cycle
Control Laptop x 3	Two used for Remote Desktop control of LeCroy Oscilloscope and DAQ Laptop. Third used for taking down notes.
Ethernet Switcher	Set in experiment room and connected LeCroy Oscilloscope and DAQ laptop. Output sent to control room Network Hub.
Network Hub	Set in control room to take output from ethernet switcher. Control laptops connected via ethernet or 5GHz WiFi.
Ethernet Cable x 3	To connect 1 control laptop, the LeCroy HDO6104 and DAQ Laptop to their respective network hubs.
Ethernet Cable	To connect control Network Hub to Ethernet Switcher.
Male-to-Male SMA Cable	Signal from enclosure port to Splitter
DC-4200 MHz Signal Splitter	Splits SMA signal to two SMA signals – sent to Oscilloscope and Digitiser.
Male SMA to Male BNC cable	Sends 1 output from splitter to Oscilloscope.
Male SMA to Male MCX cable	Sends 1 output from splitter to Digitiser
USB Cable	Caen HV unit to DAQ Laptop
Gloves	For handling scintillator
Optical gel	For coupling scintillator to PMT
Wipes	For removing optical gel

Experiment List

28 MeV beam Scattering Foil in 2mm diameter collimator 10kHz rate ~= 160pA onto Transmission Chamber before 2mm collimation

1. Bragg Peak Measurements
2. Combined scope / digitizer measurements with pristine bragg peak, 100mV trigger threshold
3. Combined scope / digitizer measurements with pristine bragg peak, varying trigger threshold
4. Degrade beam energy and measure response with 1-6mm PMMA before calorimeter
5. PRaVDA box with 2mm collimator, trigger from scope
6. PRaVDA box with 2mm collimator for trigger output

36 MeV beam Scattering Foil in 2mm diameter collimator 10kHz rate ~= 160pA onto Transmission Chamber before 2mm collimation

1. Bragg Peak Measurements
2. Combined scope / digitizer measurements with pristine bragg peak, 100mV trigger threshold
3. Combined scope / digitizer measurements with pristine bragg peak, varying trigger threshold
4. Degrade beam energy and measure response with 1-6mm PMMA before calorimeter
5. Offset 2mm collimator (by 6mm) for optimal trigger threshold
6. Double 2mm collimator (12mm separated) for optimal trigger threshold
7. PRaVDA box with 2mm collimator, trigger from scope
8. PRaVDA box with 2mm collimator for trigger output
9. Degrade beam with 1-6mm PMMA with tracker

Experiment Log

25/10/18

1. Set up apparatus as described in equipment list.
2. Beam experienced difficulties, delaying data collection.
3. Tracker operates on a 26MHz clock, and a trigger is sent whenever 2/3 silicon layers in tracker record events in a timestamp. Trigger tests were conducted with noise, hence a random rate in tests below.
4. Tested trigger output of Tracker into Oscilloscope: square wave of period ~15 ns with amplitude ~400 mV. Pulse example recorded on Oscilloscope disk in folder: SShaikh/Tracker Trigger
5. Placed signal splitter for trigger to send to both Digitiser and Oscilloscope. Amplitude reduced to ~50%. Pulse example recorded on Oscilloscope disk in folder: SShaikh/Tracker Trigger (Split)
6. Split trigger suspected too small for Digitiser (accepts trigger of order ~V), hence Digitiser set to self-trigger mode. Needs further testing.
7. Aligned calorimeter to tracker, with centre of mylar window and tracker window aligned.

Beam Tests

Calorimeter files currently located at /unix/pbt/users/dwalker/data/birm_21.02.18 on UCL HEP plus1 server.

PMT Current at HV supply -900 V, beam off: 150 μA

28MeV beam. Scope triggered by tracker.

Run Number	High Voltage (V)	Trigger Level (mV)	Trigger Source	Beam Current / Rate	Collimator	Filename	Notes
00	-900	70, +ve	Tracker (C2)	170pA/~10 kHz	2 mm centred	run00_2mmCCol_160pA_TrackTrig	First test of tracker/PMT synchronisation
01	-900	70, +ve	Tracker (C2)	160pA/~10 kHz	2 mm centred	run01_2mmCCol_160pA_tracktrig	Also took Caen ADC data
02	-900	70, +ve	Tracker (C2)	160pA/~10 kHz	2 mm centred	run02_2mmCCol_160pA_tracktrig	Caen ADC run 01 data also includes run 02 (long run)