DAQ

The Carlton setup uses this amplifier https://www.fastcomtec.com/amp/csp10-charge-sens-preamp

for single SiPMs and a custom multi SiPM board designed at TRIUMF.

DAQ components:

We will get rid of the arduino and possibly the Raspberry Pi.

DAQ setup with the CAEN desktop modules

All supplies for the dark box experiments that have to be conducted in the office have been moved to SP115. The equipment consists of:

• A dark box (this box still needs to made light tight and does not yet have feedthroughs for any cables)
• Two extension cords
• A box containing the SiPMs, both VUV and visible, the peltier element, the casing for the grating, gloves, an optical cable and connection cables
• Two boxes containing mostly power cables and the filter and amplifier boxes
• A power source (bottom) for the peltier element
• A power source (middle) for the amplifier
• A power source (top) for the SiPM bias
• An oscilloscope
• The CAEN desktop digitizer (two units)
• A heat sink for the peltier element (not in the office, get a block of copper or other metal somewhere that fits inside the dark box)
• A desktop (on the floor) with software to talk to the CAEN modules (do not remove the red USB)

Setting up the experiment:

1. Connect the extension cords to a wall outlet (not to another extension cord!)
2. Connect the power sources and the oscilloscope to the extension cords using the cables from the small see-through boxes
3. Connect the CAEN modules to eachother with the data cable (sturdy black one) and to the extension cords using their power cords (the ones with the adapters)
   1. NB. These connections are not very strong, so make sure the cords will stay connected
4. Get the filter and amplifier boxes (the silvery ones) and connect the red black and blue wires to the amplifier power source
5. Connect the 'out' BNC connector with a wire to the ANALOG IN number 1 port on the CAEN module (or to the oscilloscope or both)
6. Connect the 'in' BNC connector side with the SiPM wires (maybe need to make a wire)
7. Put the SiPM in the dark box and connect it to the wires (wear gloves and do not touch the front of the SiPM!)
8. Connect the pre-amplifier adapter (black cord from the silvery boxes) to the power
9. Connect the peltier element to the power source and place the element on the heat sink
10. Connect the desktop to the power and to the monitor
11. Connect the CAEN module with the USB cord to the desktop
12. Check if everything is connected

Starting up the experiment:

1. Turn on the oscilloscope and the desktop
2. Turn on the amplifier power source (it needs to be set to 5V), check if you see the signal change on the oscilloscope (you expect amplified noise)
3. Turn on the SiPM bias voltage and slowly increase the voltage
   1. There should not be any current running, if you see any (but really even the tiniest bit) of current when you flip the A/V meter switch, you probably put the SiPM in the wrong way or you have a short somewhere
   2. Turn the voltage all the way down again
   3. You will need try the SiPM the other way, if that does not fix it, try to find your short
   4. Check every now and then if there is still no current
4. When you reach ~56V you should see the signal on the oscilloscope change, this is our signal, the basis is now working
5. Now turn on the digitizers (they both have a switch), this should not change anything on the oscilloscope, if it does, you did something wrong (try setting the oscilloscope to 1MΩ)
6. READ AHEAD NOW UNTIL STEP 9 BEFORE DOING ANYTHING BECAUSE YOU NEED TO BE FAST
7. On the desktop, double click the DAQreadout.py file, which should start pycharm, and run it
8. You will hear a faint click when the connection to the CAEN module is established
9. Stop the DAQreadout.py file (preferably before it starts overwriting the last data file, or run it with dedicated file name (run->run->edit->edit the filename in the run command->run))
10. Now start the software that is on the desktop (SciWare or something?), it is in the bottom right corner
11. Go to Readout Devices and in the popup screen click the DT5550 and the connect
12. In the screen that pops up when connected, go to oscilloscope->oscilloscope0 and right click to view
13. In the screen that pops up now, select channel 1, and set the trigger to free running, press the play button and you should see the digitized signal
14. Stop it for a second to check at what level your signal is (probably around 7000), if it is at a different level, you have to change the trigger threshold in the VUVconfig file
15. Shut down this software completely (you cannot connect to the DAQ twice) and go back to DAQreadout.py
16. In the run->run->edit menu, edit the run command to the number of samples you'd like (1000 (2 min), 5000 (10 min) or 10000 (20 min) depending on the stability of your measurement environment, especially temperature!) and the filename
17. The convention is to use in the filename "dc" for darkcount or "xxnm" for the wavelength (not relevant now), then the SiPM type "VUVxxxx" or "VISx" where x is the number of the SiPM, and finally a number indicating the run (just in case you do the same thing multiple times), so you would get something like dc_VUV1821_1.raw or 128nm_VIS1_12.raw.
18. Start a run and check if you see data being written to the folder that also contains the DAQreadout.py file
19. After the run, move all data to a folder with the date