[Solid_gem] minutes from Wednesday's meeting

[Alexandre Camsonne]

A colleague sent me a workshop about high rate TPCs,

there are several talks about new chips in development :

https://indico.desy.de/conferenceDisplay.py?confId=7435

Alexandre


On Thu, Aug 29, 2013 at 12:01 AM, <liujianb at ustc.edu.cn> wrote:

> Hi All,
>
> We had a great kick-off meeting yesterday. Thanks to everyone for your
> participation, particularly to our colleagues in China for overcoming the
> inconvenient time difference. Also a special big thank you to Yuxiang for
> setting up ReadyTalk and a Skype group for the meeting.
>
> So below are the minutes I've just complied of yesterday's meeting:
>
> X-ray test of a 30*30cm2 GEM prototype at USTC  (Wenhao You and Yi Zhou)
> ---------------------------------------
> - A short was spotted and fixed on segment 3 of foil 1
> - Multiple 8KeV X-ray scans were performed at different times.
>  * Energy resolutiosn look OK generally.
>  * Spectrum peaks varied a lot across sectors and with time, and not in a
> monotonic way in the latter case.
>    o) This prototype was stretched completely manually. This may have
> caused imperfect tension distribution over foils resulting in non-uniform
> space between foils and eventually producing the nonuniform gains suggested
> by the spatial variations on X-ray spectrum peak.
>    o) Unstable gas condition was suspected of being responsible for the
> time variations.
> + Next to do
>   * continue the X-ray test and identify the cause of the time variations.
>   * improve foild stretching for next prototypes
>
> GEM progress from Tsinghua (Zhigang Xiao)
> -----------------------------------------
> - Two problems (high trigger rate and very narrow energy spectrum)
> reported at Huangshan workshop concerning the GEM electronics developed at
> Tsinghua have been solved by picking up trigger signals from the lowest GEM
> foil.
> - A readout PCB was designed in collaboration with Duan Limin from IMP.
> Strips are arranged in the central region, whereas pads are used on the
> skirts to reduce readout density.
>   o) It was commented that this was obviously just a temporary design that
> can not be adopted in the actul case.
> + Next to do
>   * test the home-made electronics with a large size GEM chamber.
>
> GEM status at CIAE (Chao Shan and Xiaomei Li)
> --------------------------------------
> - Status of GEM foild production R&D was presented
> - A simulation study of boron coated GEM for neuntron detection was also
> presented
> - APV25 test still ongoing. Some problems with its DAQ are being debuged.
>   o) Gu Chao is currently helping with the test and debugging
> + Next to do
>   * Kapton etching
>   * Continue with APV25 test
>
> GEM progress from LanZhou Univeristy (Xiaodong Wang)
> ---------------------------------------
> - finished a prelimenry design of GEM frame for a small GEM prototype
> (10cm*10cm)
>   o) It was suggsted to put gas input and output on two separate sides
> instead of on the same side as is the case in the current desgin.
> - designed a readout PCB for the prototype.
>   o) The feature of distributing strip readout in a much larger area that
> the actual active area in the current design won't be accepted in the Solid
> experiement.
>   o) A lot of other technical comments also received.
> + Next to do
>   * discuss with Zhouyi and others beyond the meeting for more details on
> the technical design of the readout PCB.
>
> Message from Jianping about APV25 chips
> ---------------------------------------
> If we need more APV25 chips, we should act now to allow time for getting a
> new license through approval.
>
>
> Jianbei
>
>
>
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>
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