Proton Calorimetry/Meetings/2016/11/09

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Minutes for UCL Proton Calorimetry Meeting, 9th November 2016 (D17, Physics & Astronomy, UCL)

Present

Simon Jolly, Ruben Saakyan, Laurent Kelleter, Andreas Christou, Matthieu Hentz, Adam Knoetze, Anastasia Basharina-Freshville (Phone)

AC:

  • Looking at improving fitting of Caen ADC spectrum.
  • Possible advantages of Vavilov distribution over Landau: much more complex to calculate however! RS suspects Landau will be more appropriate...
  • Continuing to look at spectrum fits for lower energy histograms.
  • Not sure which input datasets being used for fits: need to start with better distributions. Check runs listed in Proton_Calorimetry/Experimental_Runs/2016/Aug2-3.
  • Looking to use more efficient methods of numerical integration to speed up fitting in ROOT.

RS:


AK:


MH:


LK:


SJ:

  • Responses from Liviu Penescu at MedAustron regarding possible experimental visit:
    • It is possible to get 2 shifts for measurements; for more than this, it will be quite difficult, due to busy schedule at this time.
    • The room to use will be the one for "non-clinical research"; that means that the setup can be done earlier.
    • The shifts can also be during the week-nights (22h00 to 06h00), not only during weekends (but this does not increase the chances of getting more than 2 shifts before end of February, because the total pool of shifts is the same...).
  • The main remaining concern at MedAustron is the intensity. Even though there are several possibilities to reduce the beam intensity delivered per second at the isocenter, all of these would require further beam commissioning shifts aimed at this, which is not possible in the needed timeframe. Therefore there are two remaining solutions:
    • To reduce the particle number by using collimators. There again, MedAustron have the constraint that the beam at the isocenter is of only 4mm (more information from Liviu on sizes and locations of collimators to follow).
    • To install the calorimeter off-centered, in order to use only the beam "halo".
  • Discussion with Ros Perrin at PSI regarding UCL scintillator in LuCa lung phantom to image dose deposition for tumour motion:
    • We have cylindrical offcuts we can provide.
    • Laurent interested in helping with the dose reconstruction: also involves fitting to quenched Bragg curve.
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