Data Acquisition System and Triggers

Overview

Vince's detailed Writeup about HRS (some information is outdated for tritium)

Step 1

1. Use remote scopes with inputs S0 (from FIFO), S2 (from FIFO), GC (from FIFO), S0&S2 (from Logic Unit) and S0||S2 (from Logic Unit)
2. Verify that the S0 and S2 signals are as they should be (see picture (needs to be added!!!))
3. Verify that the S0&&S2 signal is within the GC signal with the desired time distance (see picture (needs to be added!!!))
4. Verify that the S0||S2 signal is within the GC signal with the desired time distance. Take also into account the extra cable delay from the S0|S2 logic unit to the (S0||S2)&&GC logic unit (see picture (needs to be added!!!))
   • NOTE: The S0&&S2 and S0||S2 times could be also estimated from the S0 and S2 signals with the known delays from the trigger schematics if there is no remote scope available for the RHRS.
5. If necessary go to the hall and change individual trigger delays!

• In parallel: Check S0, S2 and GC timings with Tong's and Jason's scripts.

Step 2

1. Go to the hall and plug in the trigger signals and S2 on the 4-channel scopes.
2. Check the individual trigger delays with respect to each and other and S2 (leads the time for S0&S2 and S0&S2&GC). Keep in mind to take also into account different cable length of the triggers from the logic unit to the TS input.
3. If necessary go to the hall and modify the cables.

• In parallel: Check trigger time distributions with Shujie's script.
• If everything looks fine we need one hall access in total, if not we need more.

LHRS scopes

• A 4-chan scope and a 2-chan scope is installed. To access them in control mode, one has to open /escope/index.html in the adaq home folder with a browser.
• The IP address of the 4-chan scope is 129.57.192.253.
• The IP address of the 2-chan scope is 129.57.164.37 or hascope1.
• Both scopes are also accessible in observer mode if you type in the IP address in the browser.