Minutes-2-27-2014

February 27, 2014 FDC meeting

Agenda

1. Installation status [1]
2. Engineering (Bill, Dave)
   1. Cathode scan
   2. LV fast shutdown
3. Electronics problematic channels (Fernando, Chris, Nick)
4. Mini-DAQ status FDC E-log (Beni)
5. Other

Minutes

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

Installation

- A cable holder frame has been installed at the top on face of the magnet (picture attached). It's too far from the mesh and the cables will sag (Nick), but better than before. We may need such frames also on the sides. New cable tray will be installed on the right side of the magnet to avoid crossing with the BCAL water pipes. Tom is working on the cable cradle that will slide together with the FDC on bearings (Bill). Bill is manufacturing the FDC-to-mesh connections made of metal and plastic to insulate the two. We also have to cut the mesh loop. Need to have also caps for the Fluorinert tubes to be used when the cooling system is disconnected from the FDC.

- Yesterday Lubomir replaced the mass flow controller (6000 sccpm range) of the temporary gas system with a re-calibrated one of 500 sccpm. It turned out that to have the same flow on the rotameter we had to set the flow at 200 sccpm or less, to be compared to setting of the previous flow controller of 400sccpm. It turned out also that gas bottle pressure goes down slower than before, but we need more days to figure this out. If this is the case then the old flow controller was leaky, but at the same time it is strange that we are flushing now successfully all the four packages with just 200sccpm total; normally we needed such a flow for one package only.

Engineering

- Bill returned from Hexagon Metrology, Charlotte, NC, and showed us pictures of the MCC machine and a lot of data: the xlsx file is attached above containing all the raw data. The cathode was scanned optically and automatically with a small step (5mm?) along the strips recording the edges of the strips. Sometimes the machine re-scanned the same point, sometime was obstructed by a defect, or by the tape on the back of the cathode that connects the foils. In any case, this is not a problem since the number of points is huge. Eugene proposed for a better visualization to make a scattered plot of all the (x,y) points. This will help to decide how to analyze the data.