SimonJolly at 15:30, 29 November 2017

2017-11-29T15:30:12Z

← Older revision		Revision as of 15:30, 29 November 2017
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	=== Present ===		=== Present ===

	'''Simon Jolly''', '''Laurent Kelleter''', '''Anastasia Basharina-Freshville''', '''Jordan Silverman''', '''Dan Walker''', '''Matthieu Hentz'''		'''Simon Jolly''', '''Ruben Saakyan''', '''Laurent Kelleter''', '''Anastasia Basharina-Freshville''', '''Jordan Silverman''', '''Dan Walker''', '''Matthieu Hentz'''

	'''ABF''':		'''ABF''':
	* ~~Spoke~~ to ~~'''Ruben Saakyan''' about Nuvia sheets~~:		* Fitting finally seems to work for single module spectrum:
	** '''~~Ruben''' visiting Prague in the next few weeks~~.		** Landau-Gaussian convolution with second degree polynomial.
	** ~~Waiting~~ for ~~Nuvia~~ to ~~determine whether they can do 2 mm sheets~~.		** ROOT requires specific order: fits Landau-Gaussian first.
	* ~~Spoke to~~ Hamamatsu ~~about~~ flat panel detectors:		** Small features on the left of peak show extra 'wrinkle' which is not quite fitted; not present in July'15 data with UCL negative base.
	** Contact person ~~might be called~~ Simon...		** Fit worse for MedAustron data but likely to be a result of pile-up.
	** ~~Preferred detector 50x50 mm version: will check the differences.~~		** FWHM from fit overestimates resolution slightly.
	* Working on fitting to single module spectrum:		* Hamamatsu provided quote for flat panel detectors:
	** Issues with ~~fitting in ROOT: version dependent..~~.		** Contact person Simon Whitehead.
	** ~~Now fitting to tail as well as peak, but transition still needs work~~.		** Recommended C9730DK-10 with faster readout rate but larger noise.
	** Will ~~add in exponential term~~ to ~~'join' two parts of fit~~.		** Will ask for quote for C9728SK-10 and check which has larger dynamic range.
			** Will also check whether we can get demo model to test: full cost £16k + £2k for software.

	'''JS''':		'''MH''':
	* ~~Spoke~~ to '''~~Glen Cowan~~''' ~~at RHUL~~ on ~~ROOT curve fitting~~:		* Working on staged simulation to improve speed:
	** ~~Suggested to add in another convolution;~~		** Large speed difference between good and bad nodes: trying to script finding fastest nodes...
	** ~~If that doesn~~'~~t work, try doing piecewise fit~~.		** Time limit of 12 hours for medium queue: some jobs overrun due to slow nodes and get ejected.
	* ~~Will prototype in Python before moving over~~ to ~~ROOT~~.		* Also trying to visualise beam profile every 25mm:
			** Can't define overlapping geometries: need to include parallel world with sensitive detectors.
			** No response from Ben Morgan: will email Geant4 mailing list.
			** Sensitive detectors provide speed up over writing data in the stepping action.
			* Will look into getting Oyster cards for ENLIGHT meeting delegates.

			'''RS''':
			* Visit to Nuvia Monday/Tuesday:
			** Requested 100x100mm sheets, 2mm or 3mm thick depending on reliability of production.
			** Total thickness of 60mm
			** Nuvia produce a thick piece of scintillator, then squeeze under heat to correct thickness, then cut out sheet.
			** Previous issues result from lack of attention to pressing...
			** Samples will arrive before Christmas (perhaps not all...).
			** Hana about to go away on maternity leave...
			* Should be possible to cut and polish samples before they arrive:
			** Derek can cut some pieces from existing spares.
			** '''Georgio Savini''' and '''David Brooks''' should have expertise on polishing.
			** Nuvia may be able to polish themselves.

	'''DW''':		'''DW''':
	* ~~Very close to finishing off producing spectra from~~ Lecroy binary files.		* ROOT scripts for reading Lecroy binary files is now working.
	* Will ~~then move on~~ to ~~curve fitting..~~.		** Defines classes for acquiring and manipulating data.
			** Just got histogram spectrum working.
	'''MH''':		** Will reject bad pulses and pulses with high variation in baseline.
	* ~~Running Clatterbridge simulations with changes in nozzle cap angle~~:		** Can output data to suitable file format.
	** ~~Very little difference in spectra~~.
	** ~~OMA Monte Carlo school indicated overlap in geometry boundaries may be a problem..~~.		'''JS''':
	* ~~Changed how particles recorded~~ from ~~stepping action to sensitive detector~~.		* Working on alternate fit for single module spectrum:
	* ~~Given up on installing Geant4 on MacBook Pro: will switch over to piss poor Lenovo CDT laptop:~~		** Fit uses Landau-Gaussian convolution with extra exponential part.
	** '''SJ''' will ask '''Tim Scanlon''' about swapping for a ~~machine with more horsepower~~.		** Χ<sup>2</sup> per NDF above 5.
			* Not entirely dissimilar from Anastasia's fitting function...
			* Will review in a week.

	'''LK''':		'''LK''':
	* ~~Discussing build-up~~ paper ~~with~~ '''~~Adam Gibson~~''':		* All of last few weeks spent writing paper on '''Build-Up Effects in Proton Therapy''':
	** ~~Simplified definition of~~ build-up ~~to be based on Bragg curve~~.		** Struggling to define protonic build-up in robust way.
	** ~~Understanding more about the physics!~~		** Using 30% of Bragg peak good at high energy but poor at low energy.
	** ~~Reran simulations at higher energies~~: ~~absorber too small~~.		** Bortfeld formula works in opposite direction: would rather not use fit (need to check with '''Adam Gibson''').
	** ~~Will contact various OMA colleagues~~ to ~~understand origin of high entrance dose for protons above 200 MeV~~.		** Have contacted '''Tracey Underwood''' to review paper.

SimonJolly: Created page with "== Minutes for UCL Proton Calorimetry Meeting, 22nd November 2017 (D17, Physics & Astronomy, UCL) == === Present === '''Simon Jolly''', '''Laurent Kelleter''', '''Anastasia Bas..."

2017-11-29T14:06:36Z

Created page with "== Minutes for UCL Proton Calorimetry Meeting, 22nd November 2017 (D17, Physics & Astronomy, UCL) == === Present === '''Simon Jolly''', '''Laurent Kelleter''', '''Anastasia Bas..."

New page

== Minutes for UCL Proton Calorimetry Meeting, 22nd November 2017 (D17, Physics & Astronomy, UCL) ==

=== Present ===

'''Simon Jolly''', '''Laurent Kelleter''', '''Anastasia Basharina-Freshville''', '''Jordan Silverman''', '''Dan Walker''', '''Matthieu Hentz'''

'''ABF''':
* Spoke to '''Ruben Saakyan''' about Nuvia sheets:
** '''Ruben''' visiting Prague in the next few weeks.
** Waiting for Nuvia to determine whether they can do 2 mm sheets.
* Spoke to Hamamatsu about flat panel detectors:
** Contact person might be called Simon...
** Preferred detector 50x50 mm version: will check the differences.
* Working on fitting to single module spectrum:
** Issues with fitting in ROOT: version dependent...
** Now fitting to tail as well as peak, but transition still needs work.
** Will add in exponential term to 'join' two parts of fit.

'''JS''':
* Spoke to '''Glen Cowan''' at RHUL on ROOT curve fitting:
** Suggested to add in another convolution;
** If that doesn't work, try doing piecewise fit.
* Will prototype in Python before moving over to ROOT.

'''DW''':
* Very close to finishing off producing spectra from Lecroy binary files.
* Will then move on to curve fitting...

'''MH''':
* Running Clatterbridge simulations with changes in nozzle cap angle:
** Very little difference in spectra.
** OMA Monte Carlo school indicated overlap in geometry boundaries may be a problem...
* Changed how particles recorded from stepping action to sensitive detector.
* Given up on installing Geant4 on MacBook Pro: will switch over to piss poor Lenovo CDT laptop:
** '''SJ''' will ask '''Tim Scanlon''' about swapping for a machine with more horsepower.

'''LK''':
* Discussing build-up paper with '''Adam Gibson''':
** Simplified definition of build-up to be based on Bragg curve.
** Understanding more about the physics!
** Reran simulations at higher energies: absorber too small.
** Will contact various OMA colleagues to understand origin of high entrance dose for protons above 200 MeV.

Proton Calorimetry/Meetings/2017/11/29 - Revision history

SimonJolly at 15:30, 29 November 2017

SimonJolly: Created page with "== Minutes for UCL Proton Calorimetry Meeting, 22nd November 2017 (D17, Physics & Astronomy, UCL) == === Present === '''Simon Jolly''', '''Laurent Kelleter''', '''Anastasia Bas..."