Proton Calorimetry/Meetings/2017/03/15: Difference between revisions

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=== Present ===
=== Present ===


'''Simon Jolly''', '''Ruben Saakyan''', '''Anastasia Basharina-Freshville''', '''Laurent Kelleter''', '''Adam Knoetze''', '''Matthieu Hentz''', '''Andreas Christou''', '''Jordan Silverman'''
'''Simon Jolly''', '''Ruben Saakyan''', '''Laurent Kelleter''', '''Adam Knoetze''', '''Matthieu Hentz''', '''Andreas Christou'''
 
'''Student talks on Friday 17th March: 14.00–15.00'''


'''AC''':
'''AC''':


* Working on waveform fitting in ROOT:
* Working on waveform integration in ROOT:
** Gaussian part of the fit works.
** ROOT can integrate pulses.
** Trying to fit falling edge of pulse using single exponential.
** Possible to set short and long gate equivalent.
** Will try implementing double exponential.
** Preliminary results for integration seem to match Anastasia's results.
* Can already filter out pulses with more than one peak:
* FINALLY have info from LeCroy to read out multiple waveforms from a single binary file:
** Will reconstruct ADC spectrum from filtered waveforms.
** Waveforms are called ''segments''.
** Will vary integration window for pulse (50, 100, 150ns used in experiment).
** Sets of waveforms are called ''sequences''.
 
** Single variable in binary header defines number of segments.
'''MH''':
* Looking at emittance and beam profile evolution along Clatterbridge beamline.
* Ignoring protons that fall outside the measurement region in simulations.
* Need to check initial parameters and beam density distributions: will plot intensity distributions to make it clearer.
* Updated geometry based on information from Andrzej.


'''AK''':
'''AK''':
* [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2017/AKnoetze_Hamamatsu_SelfTrig_2.14V_08.03.2017.pdf Looking at Hamamatsu PMT response to LED].
* [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2017/AKnoetze_15.03.2017.pdf Looking at Hamamatsu PMT response to LED:
* '''RS''' and '''ABF''' will walk through results to suggest improvements.
** 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...


'''ABF''':
'''MH''':
* Started looking at data from MedAustron experimental runs.
* [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2017/mhentz_beam_characterisation_update_15-03-2016.pdf Looking at emittance and beam profile evolution along Clatterbridge beamline].
* 0.7% FWHM energy resolution at 252MeV!
* Using new input distributions.
* Will continue analysing results: can distribute to collaborators once complete.
* 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.


'''LK''':
'''LK''':
* [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2017/LK20170308_PhotonFit.pdf Still looking at photon depth curve in simulations].
* Wrote documentation on photon fit for '''Roger Barlow'''.
* Improved y errors: includes fluctuation in energy deposition.
* '''RS''' suggests looking at fit to histograms from calorimeter (reverse Landau).
* Fit looks good but not perfect around Bragg peak.
* '''SJ''' suggests looking into 2 projects from Medical Physics:
* Errors on fitted energy underestimated but final range close to reality.
** ''Monte Carlo for Hounsfield Unit-Relative Stopping Power conversion'' (Paul Doolan);
* '''SJ''' suggests contacting '''Roger Barlow''' (Huddersfield) to discuss fit accuracy.
** ''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...

Latest revision as of 14:57, 15 March 2017

Minutes for UCL Proton Calorimetry Meeting, 15th March 2017 (D17, Physics & Astronomy, UCL)

Present

Simon Jolly, Ruben Saakyan, Laurent Kelleter, Adam Knoetze, Matthieu Hentz, Andreas Christou

Student talks on Friday 17th March: 14.00–15.00

AC:

  • 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.

AK:

MH:

LK:

  • 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...
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