SimonJolly at 19:36, 2 November 2016

2016-11-02T19:36:28Z

← Older revision		Revision as of 19:36, 2 November 2016
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	* Newer fit works over larger range, improving errors on fit, but results in slightly larger energy resolution.		* Newer fit works over larger range, improving errors on fit, but results in slightly larger energy resolution.
	* Will look at other spectra before moving onto waveform data.		* Will look at other spectra before moving onto waveform data.


	'''LK''':		'''LK''':

SimonJolly: Created page with "== Minutes for UCL Proton Calorimetry Meeting, 5th November 2016 (D17, Physics & Astronomy, UCL) == === Present === '''Simon Jolly''', '''Ruben Saakyan''', '''Laurent Kelleter'..."

2016-11-02T19:33:32Z

Created page with "== Minutes for UCL Proton Calorimetry Meeting, 5th November 2016 (D17, Physics & Astronomy, UCL) == === Present === '''Simon Jolly''', '''Ruben Saakyan''', '''Laurent Kelleter'..."

New page

== Minutes for UCL Proton Calorimetry Meeting, 5th November 2016 (D17, Physics & Astronomy, UCL) ==

=== Present ===

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

'''RS''':

* Dates for next Clatterbridge run set: 24th/25th November.
* Planning for next run:
** Same measurements as last run but with our divider rather than Hamamatsu active divider:
*** Our divider contains no active components (transistors etc.) to linearise response of PMT: may be reason for high rate distortion.
*** Additional capacitive resistance in active divider means higher resistance for high rates.
** Measure high rate and linearity: retake wheel measurement.
** Record Caen ADC, Caen waveform and scope waveform.
** Take both scintillator blocks: start with new block, try old block if we have time.
* Check with Anastasia about potential questions for next run.

'''AK''':
* Converted all data from LeCroy scope format on plus1.
* Can’t easily find peaks as all waveforms concatenated together with continuous timebase.
* Looking at ROOT, Geant4 tutorials and detector emulator manual.
* Will start looking at producing periodic pulses from detector emulator.
* Aim is to produce replica of PMT output signal for proton light pulse with realistic noise variation.

'''MH''':

* Looking at [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2016/mhentz_water_scintillator_comparison_02-11-2016.pdf energy deposition with proton pencil beam tutorials on PBT Wiki].
* Comparing energy deposition in scintillator and water: seeing nice Bragg Peaks!
* Will redo simulations using 60MeV pencil beam and check match to Clatterbridge data. Also replot with finer energy and position resolution.
* Next step is to start integrating Clatterbridge beamline simulation and characterise the effect of adding in each component.

'''AC''':

* Looking at [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2016/AChristou%2002.11.2016%20-%20improved%20adc%20fit.pptx improving fitting of Caen ADC spectrum].
* Improved quality of fit by increasing convolution number: reduces Chi2 by about half, but doubles time to produce fit.
* Newer fit works over larger range, improving errors on fit, but results in slightly larger energy resolution.
* Will look at other spectra before moving onto waveform data.

'''LK''':

* Running [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2016/LKelleter_20161102_Geant4SegmentedCalo.pdf simulations in Geant4 of segmented calorimeter].
* Reading out photon production for individual scintillator slices in response to single protons.
* Seeing both Bragg Peak and effects of quenching!
* Possible bug in Geant4: total energy deposition in scintillator + wrapping more than initial energy.
* Will fix scintillator and wrapping thickness and add more layers for higher energy.

'''SJ''':
* Date of next visit to Clatterbridge fixed for 24th/25th November.
* Have heard back from Liviu Penescu at MedAustron: still waiting on possible dates to visit for experimental runs. Liviu to confirm availability of collimators and mounting.
* Also need to arrange PSI visit: Ros Perrin/Tony Lomax lung phantom with UCL scintillator.
* Requested that future talks uploaded to [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/ wikiData presentations directory] contain some description of the data they show and include useful info in filename.

Proton Calorimetry/Meetings/2016/11/02 - Revision history

SimonJolly at 19:36, 2 November 2016

SimonJolly: Created page with "== Minutes for UCL Proton Calorimetry Meeting, 5th November 2016 (D17, Physics & Astronomy, UCL) == === Present === '''Simon Jolly''', '''Ruben Saakyan''', '''Laurent Kelleter'..."