VUVProjectsPlanning

Update September 2022

Task (measurements)	DRI	Main dependencies	Status	Finish by
Measure fluorescence efficiency of PTFE	Emily
Measure reflectance of cryostat components	Marjolein
Measure optical properties of Arapuca components	Vikas
Measure the spectrum of the D2 lamp	Jasmijn			Dec 1 (?)
Gain characterization of SiPMs	Jasmijn
Measure excitation beam intensity as function of SiPM position and slit width
Measure time stability of D2 lamp intensity
DN vs temperature characterization of SiPMs
Determine effect of exposure to radiation on fluorescence of plastics

Task (hardware)	DRI	Main dependencies	Status	Finish by
Read out pressure sensor and debug code	Marjolein	Vikas	Done	Sept 23
Check if lamp noise is still there/what it looks like now	Emily		Done	Sept 23
Cooling system for sample/SiPM planning and component ordering (design, simulations, quotes for components)	Emily		Done	Sept 27
Get SiPM signal out of vacuum (1 channel for now, 9 channels eventually)	Emily		Done	Oct 1
Leak check vacuum system and fix leaks - clean vacuum chamber - pump down and check pressure + pump-down time - tighten bolts on monochromator and feedthroughs - pump down and check pressure + pump-down time	Marjolein (Jasmijn)	Pressure read-out working	Done	Oct 1
SiPM signal output - Adjust readout frequency cutoffs (Hans' one-channel board) - Test SiPM signal (noise) when pump and lamp are on, fix if necessary - Connect and test the Zurich board - signal-to-noise - Figure out what changes if any are needed to bias and read the fluorescence measurement SiPMs - Design and get a SiPM connector plug for inside the vacuum	Emily	Vacuum/light leak eliminated	Done	Oct 7 (Oct 20 for the new board)
Design SiPM array holder for fluorescence	Marjolein	Preliminary analysis of sensitivity needs finished		Nov
Design SiPM array holder for reflectance/transmission	Marjolein	Analysis of physics goals finished		Nov
Get SiPM signal to disk such that single-pulse rates can be measured (programmable CAEN digitizer for now, V1720 with XAMS-like read-out later)	Marjolein (Jasmijn)			Nov
Calibrations start	Emily Marjolein	Minimum working setup		Dec
Get sample holder (fluorescence design) built	Emily		Done	Nov
Install cooling system (LN2 plate, thermal shorts, LN2 fill system, super insulation)	Emily	Delivery of components/LN2 approval for lab		Dec/Jan		Set up slow-control read-out and data storage, monochromator motor control	Vikas -> ?			Jan

Task (review and calculations)	DRI	Status	Finish by
Estimate sensitivity needs of the PTFE fluorescence measurement (preliminary, rough calculation)	Emily (Jasmijn)		Oct 28
Review past reflectivity setup design/sample holder (that had XENON in mind) in light of DUNE needs	Marjolein		Oct 30

Update August 2022

PhDs:

Vikas: At CERN until end of the year. Will work a little bit with CT technician to get code and slow control in good shape.

Emily: Focus on getting the SiPM signals to the digitisers. Work with Hans from ET department.

Marjolein: Focus on getting the data from the digitisers into a good format. Work with Maricke/Joran to copy XAMS read-out software.

Undergraduates:

Ilze (start Sept 12, HBO internship): Get vacuum chamber working correctly, design improved SiPM holder. Measure beam intensity as function of distance using SiPM

Jasmijn (start Sept, AUC capstone project): Measure lamp spectrum. Based on expected PTFE fluorescence efficiency, calculate amount of light expected on SiPM, and whether that is measurable over the DC rate

Not free: Monday 11-14, Tuesday 11-13, Wednesday 9-12, Thursday 16-18, Friday 16-18

Lucia (January 2023): Measure the SiPM DC rate as a function of temperature

Projects for distibution

1. SiPM array and holder --> reflectivity design (modelling/ mechanical viability/ feedthrough positioning)
2. SiPM array and holder --> fluorescence design (modelling/ mechanical viability/ movement inside chamber/ solid angle coverage)
3. Cooling system for sample holder/SiPMs (CAD/COMSOL/ LN2 bath)
4. Put together a plan for data taking