Proton Calorimetry/Experimental Runs/2025/Prague 2025-04

Experiment Equipment

Item	Notes
Portable Enclosure	Modified Small Peli Case Wheeled. Features mount for scintillator stacks, front and back openings for beam, patch panel with ports. Mylar windows with 3D printed alignment plates: approximately light-tight.
Rev. E Scintillator stack 1 (with Rev. E boards no. 1 (L) and 4 (R))	32 X x 105 mm, Y x 105 mm and Z x (approx) 3 mm sheets (mix of opaque and machined sheets).
Rev. E Scintillator stack 2 (with Rev. E boards no. 3 (L) and 9 (R))	32 X x 105 mm, Y x 105 mm and Z x (approx) 3 mm sheets (just machined sheets with the closest to ideal thicknesses ~3mm).
Rev. E Scintillator stack 3 (with Rev. E boards no. 5 (L) and 6 (R))	32 X x 105 mm, Y x 105 mm and Z x (approx) 3 mm sheets (mix of opaque and machined sheets).
Rev. E Scintillator stack 4 (spare stack not installed)	32 X x 105 mm, Y x 105 mm and Z x (approx) 3 mm sheets (mix of opaque, machined, and injection moulded sheets - stacked in pairs in alternating directions).
Rev. E Scintillator stack 5 (with Rev. E boards no. 7 (L) and 10 (R))	32 X x 105 mm, Y x 105 mm and Z x (approx) 3 mm sheets mix of opaque, machined, and injection moulded sheets - stacked in pairs in alternating directions).
Rev. E Texas Instruments DDC232 custom circuit board (x9 - 8 installed in modules 1,2,3,5 and one spare)	Housing 32x Hamamatsu S12915-16R photodiodes, coupled directly to scintillator sheets. Aligned by eye to scintillator sheets.
USB104 FPGA development board x 2 (1 main and 1 spare)	For interfacing between DDC232 and pi.
Raspberry pi5 x 2 (1 main and 1 spare)	Control data acquisition + visualise GUI.
Power Strip:	To connect FPGA and daughter board.
DAQ laptop x1	Back up option for data acquisition.
Control Laptop x2	1 for remote control (Sonia's MacBook Pro), 1 for notes/web GUI (Joe's MacBook Pro).
D-LINK Network Hub	Set in experimental room to connect pi5, DAQ laptop + NPL devices
GL-Inet Router	Set in control room to take output from experimental room ethernet connection. Control laptops connected via ethernet or 5GHz WiFi.
Ethernet Cable x4	To connect pi5 and DAQ laptop to network in the experimental room, hub to wall and in control room router to wall, and router to laptop.
MacBook Adapters x2: one for pi5 DAQ laptop one for DAQ laptop
Spare Cables:	Usb-C
Gloves	For handling scintillator

Experiment Plan

Saturday 26th April

1) Shoot-through of each scintillator stack at 250 MeV to check prior calibration. 50mm absorber (?) -> scint stack -> water dump/IBA Zebra or Giraffe for simultaneous WET measurement. Both directions for stack so will rotate midway through.

2) Background measurement of scintillator stacks 1 - 4

-- UCL: Add calibration files to appropiate file for GUI

3) Rotate gantry to front of case. Full system check at 245 MeV with beam on axis.

4) Pristine Bragg Peak (with equal dose) measurements at 70, 100, 130, 150, 170, 200, 245 MeV. Beam on axis.

5) Single slice SOBP at 5Gy or 10 Gy (if available) over full energy range between 70 MeV and 245 MeV.

6) Pristine Bragg peak measurements with beam on axis for different lateral positions i.e. by moving couch. At energies of:

30,000 measurements ~ 5 secs for pristine Bragg peaks/shoot throughs.

1-2 mins per SOBP.