Proton Calorimetry/Meetings/2017/02/15: Difference between revisions

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== Minutes for UCL Proton Calorimetry Meeting, 25th January 2017 (D17, Physics & Astronomy, UCL) ==
== Minutes for UCL Proton Calorimetry Meeting, 15th February 2017 (D17, Physics & Astronomy, UCL) ==


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


'''Simon Jolly''', '''Ruben Saakyan''', '''Anastasia Basharina-Freshville''', '''Laurent Kelleter''', '''Adam Knoetze''', '''Matthieu Hentz'''
'''Ruben Saakyan''', '''Anastasia Basharina-Freshville''', '''Laurent Kelleter''', '''Adam Knoetze''', '''Matthieu Hentz'''
 
'''MH''':
* Worked on emittance of protons in Clatterbridge beam line. Need to check size of initial source (beam outside beam pipe!). Maybe switch so coloured plot instead of scatter-plot. Check for secondary protons, too.


'''AK''':
'''AK''':
* Working with pulser and LED.
* Made measurements with lower LED frequency. Part of the rate problem is understood: Coming from the frequency dependent signal inverter used for pulser trigger mode. Go to self trigger mode or adapt signal form (NIM to TTL).
* Running detector emulator into digitiser produces exact replication of spectra as expected.
* Driving LED with detector emulator more problematic: digitiser won't trigger properly on PMT output.
* Driving LED with regular pulses gives similar response to experimental measurements:
** For Hamamatsu base, mean ADC position (gain) drops with frequency then stabilises around 100kHz;
** For UCL base, ADC mean drops quickly then rises from ~30kHz up to ~450kHz.
* Will try more measurements at lower and higher frequencies.
 
'''MH''':
* PDFs of layout sent to Clatterbridge and Carsten Welsch: no response as yet...
* Measuring the emittance evolution down the Clatterbridge beamline:
** Original element written by ESA: doesn't work...
** Will write own custom element for specifying input emittance.


'''LK''':
'''LK''':
* [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2017/LK20170208_ProtonRangeFromPhotons.pdf Looking at getting the proton range (mean proton energy) from a scintillation photon depth distribution].
* [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2017/LK20170215_BraggAndPhotonFit.pdf Managed to fit Bragg curve and photon yield. Fine tuning necessary
* Deriving analytic function to describe quenched Bragg Peak very complex...and may not be accurate...

Latest revision as of 16:54, 17 February 2017

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

Present

Ruben Saakyan, Anastasia Basharina-Freshville, Laurent Kelleter, Adam Knoetze, Matthieu Hentz

MH:

  • Worked on emittance of protons in Clatterbridge beam line. Need to check size of initial source (beam outside beam pipe!). Maybe switch so coloured plot instead of scatter-plot. Check for secondary protons, too.

AK:

  • Made measurements with lower LED frequency. Part of the rate problem is understood: Coming from the frequency dependent signal inverter used for pulser trigger mode. Go to self trigger mode or adapt signal form (NIM to TTL).

LK:

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