Proton Calorimetry/Meetings/2017/03/15 - Revision history

SimonJolly at 14:57, 15 March 2017

2017-03-15T14:57:09Z

← Older revision		Revision as of 14:57, 15 March 2017
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	* FINALLY have info from LeCroy to read out multiple waveforms from a single binary file:		* FINALLY have info from LeCroy to read out multiple waveforms from a single binary file:
	** Waveforms are called ''segments''.		** Waveforms are called ''segments''.
	** Sets of waveforms are called '''sequences'''.		** Sets of waveforms are called ''sequences''.
	** Single variable in binary header defines number of segments.		** Single variable in binary header defines number of segments.

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	'''MH''':		'''MH''':
	* Looking at emittance and beam profile evolution along Clatterbridge beamline.		* [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].
	* ~~Ignoring protons that fall outside the measurement region in simulations~~.		* Using new input distributions.
	* ~~Need to check initial parameters and~~ beam ~~density distributions: will plot intensity distributions to make it clearer~~.		* Beam evolution looks realistic: nice big hole at stopper!
	* ~~Updated geometry based on information from~~ Andrzej.		* Final beam energy 60.22 MeV.
			* '''SJ''' will send presentation to '''Andrzej Kacperek''', '''Carsten Welsch''', '''Hywel Owen''' and '''Colin Baker''' for review.

	'''~~ABF~~''':		'''LK''':
	* ~~Started~~ looking at ~~data~~ from ~~MedAustron experimental runs~~.		* Wrote documentation on photon fit for '''Roger Barlow'''.
	* ~~0.7% FWHM energy resolution at 252MeV!~~		* '''RS''' suggests looking at fit to histograms from calorimeter (reverse Landau).
	* ~~Will continue analysing results: can distribute to collaborators once complete~~.		* '''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).

	'''LK''':		'''RS''' on behalf of '''ABF''':
	* ~~[http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2017/LK20170308_PhotonFit.pdf Still~~ looking at ~~photon depth curve in simulations].~~		* '''ABF''' looking at rate-dependent gain:
	* ~~Improved y errors: includes fluctuation in energy deposition~~.		** Average anode current too high due to gain (number of stages) and light output of scintillator.
	* ~~Fit looks good but not perfect around Bragg peak~~.		** LED behaviour replicates MedAustron testbeam data almost exactly.
	* ~~Errors on fitted energy underestimated but final range close~~ to ~~reality~~.		* In discussions with Hamamatsu to build PMT with fewer dynode stages to produce lower gain and smaller peak current.
	* ~~'''SJ''' suggests contacting '''Roger Barlow''' (Huddersfield)~~ to ~~discuss fit accuracy~~.		* New detector should be able to reach >10MHz rates...
	~~'''~~

SimonJolly at 14:19, 15 March 2017

2017-03-15T14:19:17Z

← Older revision		Revision as of 14:19, 15 March 2017
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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.

			'''AK''':
			* [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...

	'''MH''':		'''MH''':
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	* 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.		* Updated geometry based on information from Andrzej.

	~~'''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].
	* '''RS''' and '''ABF''' will walk through results to suggest improvements.

	'''ABF''':		'''ABF''':

SimonJolly: Created page with "== Minutes for UCL Proton Calorimetry Meeting, 15th March 2017 (D17, Physics & Astronomy, UCL) == === Present === '''Simon Jolly''', '''Ruben Saakyan''', '''Anastasia Basharina..."

2017-03-15T14:03:49Z

Created page with "== Minutes for UCL Proton Calorimetry Meeting, 15th March 2017 (D17, Physics & Astronomy, UCL) == === Present === '''Simon Jolly''', '''Ruben Saakyan''', '''Anastasia Basharina..."

New page

== Minutes for UCL Proton Calorimetry Meeting, 15th 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''':
* [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''':
* 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''':
* [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2017/LK20170308_PhotonFit.pdf 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.
'''