Proton Calorimetry/Meetings/2020/12/09

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Minutes for UCL Proton Calorimetry Meetings, 9th December


Simon Jolly, Raffaella Radogna, Saad Shaikh, Fern Pannell

Raffaella Radogna

Saad Shaikh

  • Compared readout speeds of TI DDC232, DDC316 and DDC118: DDC232 with 1:1 photodiode to input mapping is the best option, with largest dynamic range and minimum integration time of 181 us with 5 modules.
  • Optimised live ROOT-based plotting and fitting of photodiode data: can get roughly 40 FPS with live plot and 6 FPS with live fit (with residual plot).
    • Will investigate frame rate without residual plot and without any graphing.
  • Took measurements at home using UV torch – doesn't appear to be a good uniform source of light. Results appended to Nov 12th experiment.
  • Successfully ran libFTDI on Windows using Visual Studio and can connect via DPTI on Nexys Video after overwriting default FTDI USB drivers.
    • libFTDI deregisters USB CDC drivers upon use – Matt has suggested a fix to split JTAG and DPTI sides of interface into two cables. Will require new cable and soldering modification to Nexys Video, which will be done some time next week.
    • Once up and running, will hopefully be able to debug and continue to develop USB interface.

Fern Pannell

  • PhotodiodeValues.csv can now be updated by running the Java file on the HEP server
    • SSH user connection, followed by SSH pc1XX.
    • Navigate to java directory within pbt/PDdisplay
    • Run java -cp . pbt.PhotoDiodeDataWriter 20 ../photodiodeValues.csv (where output rate and path file can be specified)
    • Some issues seem to occur in the display when running at 50Hz (values displayed not matching those being generated). Seems fine at 20Hz.
  • Need to determine how to translate the current working (but limited) prototype display into either CanvasJS or Chart.js
    • Investigate whether CanvasJS or Chart.js is more suitable for final display
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