Compton monitoring

The Compton polarimeter can be used to non-invasively monitor the beam polarization. It has three major components: an optics table with a laser that can lock to a Fabry-Perot cavity; an electron detector to count scattered electrons; and a photon detector to count scattered photons. At present, the electron detector is not online, so only the photon detector can be used.

Taking Compton Data

Runcontrol Already Open To start a run, click the "Start" button in the runcontrol window. After a time, you should see the event count start to go up and the message "Transition Go Succeeded" at the bottom of the screen.

While running, you can monitor the beam current, photon rates, cavity status, etc using a strip chart. If the chart is not already open, type "StripTool transversity" in a compton@compton terminal. (The password is the same as for the adaq account.) Here's what it might look like:

Starting from Scratch SSH into the compton@compton account. The password is the same as for the adaq account.