Proton Calorimetry/Meetings/2016/11/16
Minutes for UCL Proton Calorimetry Meeting, 16th November 2016 (D17, Physics & Astronomy, UCL)
Present
Simon Jolly, Laurent Kelleter, Andreas Christou, Adam Knoetze, Anastasia Basharina-Freshville (Phone)
LK:
- Most of last week spent at Software Carpentry workshop.
- Managed to run OpenGL visualiser, but not successfully...
- Needs to speak to Lawrence about initialising optical photons in calorimeter simulations.
- Would like an introduction on the experimental runs at Clatterbridge from ABF.
AC:
- Loaded down with coursework this week...
- Calculated kappa for Vavilov distribution for mylar: as RS mentioned last week.
- Emailed ROOT developers about improving integration routine to speed up analysis.
- Will probably move onto individual waveform fitting since spectrum fitting needs input from MH's' simulations: will talk to ABF about loading waveform files.
AK:
- Still working on producing waveforms with Caen detector emulator.
- Managed to test imported spectrum: adjusts magnitude of specified waveform shape according to spectrum.
- Reconstructing waveform magnitude and integrated signals using scope: integrated signal matches input spectrum, but magnitude histogram shows double peaks.
- Will investigate double peaks next week but continue working on producing PMT-like pulses.
- Will also adjust format of ASCII scope waveform files to restart timebase for each waveform, rather than continuous.
SJ:
- Email James Dawson at DPD Couriers for quote for Clatterbridge transport.
ABF:
- Putting together list for upcoming Clatterbridge trip.
- Optical module setup to be used:
- 2” Hamamatsu R13089-100 PMT with negative UCL soldered base (running at -900 V)
- Coupled to a 3 cm x 3 cm x 5 xm cuboid ENVINET/NUVIA standard scintillator
- Coupled with BC-630 gel and wrapped in 3 layers of PTFE on the sides and 12 um of Mylar on the sides and entrance face.
- List of measurements to make at Clatterbridge (not necessarily in this order):
- Remember to do a peak current estimate at -900 V at a threshold of -100 mV.
Note! Results for peak current at -900 V with Hamamatsu active divider base PMT:
Amplitude: 421 mV
Width: 29.2 ns
At a threshold of: - 100 mV
Peak current: 12 mA - Energy-range calibration scan with the Clatterbridge wheel carried out at low rates and using fine steps:
Using the digitiser in ADC mode for a gate of 150 ns
Some data collected with the digitiser in waveform mode - Measurements with two PMMA plate thicknesses corresponding to two different wheel segment thicknesses to again confirm that we are only going through one segment of the wheel.
- ADC and especially waveform data collected at a range of rates going up to high rates.
- Calibration of scattering foil current and rates measured on the scope, so we can hopefully extrapolate the rates using the scattering foil current more accurately this time.
- Rate tests with the scope.
- Data taking with the scope.
- Remember to take note of the dose delivered to the scintillator!
- Remember to do a peak current estimate at -900 V at a threshold of -100 mV.
- List of equipment to take (please add anything we've forgotten):
- Digitiser
- Portable HV unit
- Laptop
- Scope, keyboard and mouse
- The usual “box of tricks”, containing things like BC630 gel, the two scintillators, the two PMTs, barrels and connectors etc.
- The smaller of the two black boxes to house the OM setup
- Small pulser? We usually bring this with us but so far haven’t needed to us it (SJ: not necessary).
- This time, as we’re using a courier, I think perhaps it best to not take the large hexagonal OM with us. Ruben - you usually bring some emergency tools with you - is there something you recommend we take with us since you won’t be there this time?
- “To Do” before trip:
- 207Bi measurement for radiation hardness tests.
- Transportation of equipment from UCL form (will this need to be given to the courier?)
- Finalise organising courier - we are still waiting to hear from MSSL. If they don’t respond soon I’ll send them an email.