Changes between Version 3 and Version 4 of Research/LhARA/RadiationBiology/Meetings/2025-10-30


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Timestamp:
Oct 30, 2025, 5:00:39 PM (5 days ago)
Author:
ccd24
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  • Research/LhARA/RadiationBiology/Meetings/2025-10-30

    v3 v4  
    2727 - Missing pulses were traced to a failed power supply. New power supply gives an increase in energy. The increase in power was sufficient to move one of the system outside its linear range and compromise operation. There are ND filters in the system to correct for this and once the problem was identified and located, the level of filtering was corrected and the team were able to produce a good focal spot at close on Tuesday. On Wednesday, the quads were placed in the beamline and we saw proton focus. Today (Thursday), the quads were moved as close to the source as possible, and an increase in proton flux was seen. A z-scan has also been performed, waiting for resutls.
    2828- Dose Rate Update:
    29  - [raw-attachment: Dose_Rate_Calc.pptx Slides]
     29 - [raw-attachment:Dose_Rate_Calc.pptx Slides]
    3030 - Calvin's sim produced ~1Gy. The RCF dose calculated by Nick peaked at 7Gy in the distribution. Tony produced a number of 2000Gy. Believe this must be a normalisation issue. Possibly a confusion of N vs E compared with dN/dE vs E
    3131 - Clarify the problem to Tony so that he can calculate a more accurate dose per pulse
    … …  
    3838- However, fear with the statistics used in the optimisation causing the noise to dominate and uniformity being lost to noise.
    3939- Can improve the sims by reducing the bin sizes.
    40  - [raw-attachment: Optimal_gold_setup.pptx Slides]
     40 - [raw-attachment:Optimal_gold_setup.pptx Slides]
    4141- Alfredo simulation results
    4242 - Indicated that a run with higher stats still looks uniform