Minutes for UCL Proton Calorimetry Meeting, 15th March 2017 (D17, Physics & Astronomy, UCL)
Simon Jolly, Ruben Saakyan, Laurent Kelleter, Adam Knoetze, Matthieu Hentz, Andreas Christou
Student talks on Friday 17th March: 14.00–15.00
- Working on waveform integration in ROOT:
- ROOT can integrate pulses.
- Possible to set short and long gate equivalent.
- Preliminary results for integration seem to match Anastasia's results.
- FINALLY have info from LeCroy to read out multiple waveforms from a single binary file:
- Waveforms are called segments.
- Sets of waveforms are called sequences.
- Single variable in binary header defines number of segments.
- [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2017/AKnoetze_15.03.2017.pdf Looking at Hamamatsu PMT response to LED:
- Measurements over wide range of frequencies with fixed current.
- Also took data with emulator.
- Odd results from UCL base: probably broken by RS in transit from MedAustron...
- Looking at emittance and beam profile evolution along Clatterbridge beamline.
- Using new input distributions.
- Beam evolution looks realistic: nice big hole at stopper!
- Final beam energy 60.22 MeV.
- SJ will send presentation to Andrzej Kacperek, Carsten Welsch, Hywel Owen and Colin Baker for review.
- Wrote documentation on photon fit for Roger Barlow.
- RS suggests looking at fit to histograms from calorimeter (reverse Landau).
- SJ suggests looking into 2 projects from Medical Physics:
- Monte Carlo for Hounsfield Unit-Relative Stopping Power conversion (Paul Doolan);
- Build-up effect and skin sparing in proton therapy (Adam Gibson).
RS on behalf of ABF:
- ABF looking at rate-dependent gain:
- Average anode current too high due to gain (number of stages) and light output of scintillator.
- LED behaviour replicates MedAustron testbeam data almost exactly.
- In discussions with Hamamatsu to build PMT with fewer dynode stages to produce lower gain and smaller peak current.
- New detector should be able to reach >10MHz rates...