Minutes-1-23-2014

January 23, 2014 FDC meeting

Agenda

1. Installation [1],[2] (all)
2. Engineering (Bill)
3. Electronics [3] (Chris, Nick)
4. Mini-DAQ results FDC E-log (Beni)
5. Other

Minutes

Participants: Eugene, Fernando, Dave, Nick, Chris, Simon, Beni, and Lubomir.

Installation

- The third quadrant (down left) has been connected to the detector side (see pictures attached). To keep the cables flat on the mesh, Casey uses long zip ties; we want to make sure that at the inner side of the mesh (second picture) these ties do not touch the CDC. Starting Monday, Nick and Chris (with the help of Casey and Tina if needed) will start routing these quadrant below the platform to the electronics side. Before that, over the weekend, Beni will test the second half of the quadrant (packages 3 and 4) with the mini-DAQ.

- The HV was stable at +2100V/-500V without any trips from last Thursday (1/16) till Tuesday (1/21). On Tuesday Lubomir increased it to +2200V/-500V and it was stable over the night for all the channels, except four channels where the negative HV had to be lowered by 100V to have it stable. On Wednesday morning suddenly all the positive HV channels were turned off and it is not clear how, because the lab was closed and there was nobody in the Hall. We suspect it was a power glitch, but then why the negative HV channels were still on. Beni suggested checking if the ROCs did restart at the same time which may suggest it was a power problem.

- On Wednesday also the gas bottle was empty. Since there were no techs to crane a new bottle, Lubomir switched to another bottle used before which was empty by Thursday morning. It turned out that one bottle (Ar/CO2 40/60 pre-mixed) at 800 sccpm is good for four days. We decided with Tom to have always one extra, full bottle, craned on the platform, so that we can change the gas without the techs being there. Another option would be to mix the gas using a temporary gas system, but Eugene suggested we better use pre-mixed bottles till the final gas system is ready. Then, as Beni explained, the idea is to have 12 Ar bottles used at the same time (connected in one by the supplier). This is not the case for the CO2 bottles, but we will have many of them at the same time.

Engineering

- Bill was transporting (that's why not at the meeting) the extra cathode mounted on the strong back to be scanned at a Williamsburg company. It turned out they don't have an optical CMM with these sizes, but suggested to contact the same company (New River Kinetics) at Richmond.

Electronics

- Fernando and Bill decided this morning