Proton Calorimetry/Meetings/2020/12/09

Minutes for UCL Proton Calorimetry Meetings, 9th December

Simon Jolly, Raffaella Radogna, Saad Shaikh, Fern Pannell

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.

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