[Clas12_first_exp] RC update so far, and Meeting at 3pm on Monday

[Lei Guo]

Dear All,

I’d like to give you a brief update.

Overall, it’s been not too many troubles and we are steadily taking production data. A few issues are summarized below:

1. FT trigger problem: Starting from Thursday day shift, we have experienced quite a number of issues with the FT triggers (Bit 24, 25, 26, and 27). This sometimes can be resolved by rebooting the adcft1,2,3, rocs, but that doesn’t always happen. Sergey/Ben/Valery believes that this might be due to problematic FADC->VTP trigger link in the hodoscope crate, and plans to replace the module on Monday. Hopefully, this will solve the issues. The impact is that we had to take 5 runs without the FT triggers since Thursday 4pm. The good news is that the majority of the runs were not impacted.
(An example of the issue can be seen here: https://logbooks.jlab.org/entry/3569189 <https://logbooks.jlab.org/entry/3569189>)

2. FTtrck high occupancy for channel 100 (Saturday Owl) which was solved by recycling the LV. The problem has not resurfaced.

3. MVT gas temperature problem. This was resolved for the time being (https://logbooks.jlab.org/entry/3568775 <https://logbooks.jlab.org/entry/3568775>). On Monday Bob/Francesco will further look into this issue since we are expecting hot weather ahead and this problem might resurface.

Since there are various issues that we hope will be resolved on Monday, I’d like to have a RC meeting at 3pm tomorrow. 

Cheers!

Since



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