Proton Calorimetry/Meetings/2017/03/08: Difference between revisions

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* Ignoring protons that fall outside the measurement region in simulations.
* 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.
* Need to check initial parameters and beam density distributions: will plot intensity distributions to make it clearer.
* Updated geometry based on information from Andrzej's.
* 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_Hamamatsu_SelfTrig_2.14V_08.03.2017.pdf Looking at Hamamatsu PMT response to LED].
* '''RS''' and '''ABF''' will walk through results to suggest improvements.


'''ABF''':
'''ABF''':
* Testing LED pulser to check whether variation in gain comes from LED or PMT.
* Started looking at data from MedAustron experimental runs.
* After MedAustron will retest with super-stable SuperNEMO LEDs.
* 0.7% FWHM energy resolution at 252MeV!
* Taking signal from last dynode rather than anode to avoid final gain stage (~3.5) and saturation.
* Will continue analysing results: can distribute to collaborators once complete.
* Long scintillator bars arrived from Nuvia:
** Wrapped in mylar only to reduce amount of internal reflections.
** Energy resolution worse: ~11% at 1MeV.
* Preparing for MedAustron: '''MH''' and '''LK''' will prepare cables...
* Housing needs modifying to fit long scintillator bar: need to make sure its light tight in case room lights cannot be switched off.  '''LK''' suggests using a cardboard box...


'''LK''':
'''LK''':
* [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2017/LK20170222_PhotonFit.pdf Fitting curve to photon yield to check Bragg curve].
* [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2017/LK20170308_PhotonFit.pdf Still looking at photon depth curve in simulations].
* Fit not yet perfect: still using an approximation.
* Improved y errors: includes fluctuation in energy deposition.
* Fit looks good but not perfect around Bragg peak.
* Errors on fitted energy underestimated but final range close to reality.
* '''SJ''' suggests contacting '''Roger Barlow''' (Huddersfield) to discuss fit accuracy.
'''

Latest revision as of 15:10, 8 March 2017

Minutes for UCL Proton Calorimetry Meeting, 8th March 2017 (D17, Physics & Astronomy, UCL)

Present

Simon Jolly, Ruben Saakyan, Anastasia Basharina-Freshville, Laurent Kelleter, Adam Knoetze, Matthieu Hentz, Andreas Christou, Jordan Silverman

AC:

  • Working on waveform fitting in ROOT:
    • Gaussian part of the fit works.
    • Trying to fit falling edge of pulse using single exponential.
    • Will try implementing double exponential.
  • Can already filter out pulses with more than one peak:
    • Will reconstruct ADC spectrum from filtered waveforms.
    • Will vary integration window for pulse (50, 100, 150ns used in experiment).

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:

ABF:

  • Started looking at data from MedAustron experimental runs.
  • 0.7% FWHM energy resolution at 252MeV!
  • Will continue analysing results: can distribute to collaborators once complete.

LK:

  • Still looking at photon depth curve in simulations.
  • Improved y errors: includes fluctuation in energy deposition.
  • Fit looks good but not perfect around Bragg peak.
  • Errors on fitted energy underestimated but final range close to reality.
  • SJ suggests contacting Roger Barlow (Huddersfield) to discuss fit accuracy.

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