Sphenix-tpc-l mailing list

["Tarafdar, Sourav" <sourav.tarafdar AT vanderbilt.edu>]

Hi Bill and Oleg,

I went through the QA document and most of it is clear. Just couple of questions mostly about section 6. 

1. Is the method of stretching is gluing has been left out for the time being and will be added later ?

2. Other than  HV testing of GEM shouldn’t we also include the measurement of capacitance of the GEM in the testing procedure ? Usually for standard 10x10 GEM the capacitance is about 5.7 nF though I am not sure what it will be for the sTPC GEMs .  We might want to measure the capacitance of these GEMs both before and after framing. Also in the air and in N2 gas environment. Even better if we do it after placing the GEM in the experimental gas mixture but may be it will be over kill. 

3. Also one can test the GEMs conductivity using multimeter. In principal it should show 0 nanosiemens with fluctuation of unto +/- 0.2 nanosiemens. This again can be done before and after framing the GEMs.

4. Do we really need to check all the 16 GEM sectors for leakage current at the same time or we can just do 8-9 sectors at one time and then go for rest of the sector ? This question is mostly because we have 10 channel pico ammeter so testing all the 16 sectors at the same time seems difficult.

5. Checking the SMD load resistor . Any specific procedure to follow or just checking the resistor values using multimeter will be good enough ?

Thanks,

-Sourav

On Apr 19, 2019, at 1:22 PM, William Llope <wjllope AT wayne.edu> wrote:

Hi tom and all

I missed the meetings this week, but did hear about the "QA documents" effort
from Oleg. I was unable to figure out what to do with a couple of the documents
he gave me (something about the NSLS-II?), but we did take a stab at the SOP
document.

Oleg wrote section 6, and I wrote the rest.
It is attached.

Any comments would be much appreciated - I don't yet have a good feel for
what is really needed here, so this version may be pretty bad!!

 cheers
     bill

> On Apr 18, 2019, at 2:11 PM, Thomas K Hemmick <Thomas.Hemmick AT stonybrook.edu> wrote:
>
> Hi Everyone
>
> Today's L2 managers meeting is pressing on us for the schedule of activities.  Since the practice session for the management plenary talks for the PD2/3 review are now scheduled for May 9, they would very much like all our action items (e.g. the new QA documents!) to be already available at that point.  This is a bit earlier than I had specified in yesterday's meeting when I was referencing the May 15 date for the L2 manager's review.
>
> Thanks,
> Tom
>

___________________________
W.J. Llope       Ph.D., Assoc. Prof.
http://wjllope.physics.wayne.edu/
Wayne State University, Physics    
666 W. Hancock, Room 347
Detroit, MI  48201
313-577-9805

<SOP_GemFrameAndTest_20190419.docx>