Webpage title: How can I measure the threshold voltage for my muon experiment?

[Bigfoots mum]

Hi,

Im currently doing an experiment with muons : detection, measuring lifetimes, mass etc.
Im currently struggling with a basic measurement.
I have a standard NIM crate setup, with discriminator, delay, coincidence units etc, and an oscilloscope. I have no user manuals for any of the units however.
I have 2 photomultiplier tubes and i connect each of these to a discriminator. I want to adjust the discriminator threshold voltage to minimise noise and other systematic issues, but I am not entirely sure how i measure this threshold voltage using my equipment. To alter the threshold, i have to adjust a small screw on the discriminator unit.

Any help or good references would be greatly appreciated.
Thanks

 

[mark726]

Hi, it sounds like you are off to a great start with your muon experiment! Adjusting the discriminator threshold voltage is an important step in minimizing noise and ensuring accurate measurements. Here are a few suggestions for measuring the threshold voltage using your equipment:

1. Check the manual for your oscilloscope: Even though you don't have manuals for your NIM crate units, you may have one for your oscilloscope. Check the manual for instructions on how to measure voltage levels. You may also find information on how to adjust the trigger level, which can help with setting the discriminator threshold.

2. Use a voltmeter: If you have a voltmeter, you can use it to measure the threshold voltage directly. Connect the voltmeter to the output of the discriminator and slowly adjust the threshold until you see a change in the voltage reading. This will give you an approximate value for the threshold voltage.

3. Use a pulse generator: Another option is to use a pulse generator to send a known voltage signal to the discriminator. This will allow you to adjust the threshold until the signal is just above or below the threshold, giving you a more precise measurement.

4. Collaborate with other scientists: If you have colleagues or contacts who have experience with similar equipment, they may be able to provide guidance or even loan you a manual for the units you are using. Don't be afraid to reach out for help or advice!

I hope this helps and good luck with your experiment!