[Moller_intdet] [EXTERNAL] Formation of MOLLER HVMAPS Working Group

[David Armstrong]

Hi Michael,
   Please add me to the working group. Let's keep this as separate 
meetings (for now, at least).
  cheers,
    David

  On 5/20/21 12:38 PM, Michael Gericke wrote:
> Hello everyone,
>
> As you may be aware, part of the CFI funding for the main detector is 
> earmarked for a set of HVMAP detectors that would cover
> the ring 5 annulus and the associated electronics. The purpose of 
> these detectors is to monitor scattered electron profile at higher
> rates than what is meant to be achieved by the tracking GEMs, although 
> perhaps not quite at the full beam current (at least not
> without integrating the events in the pixels). These pixel detectors 
> are meant to be placed close to and probably immediately behind
> the the ring 5 quartz tiles. The pixel chips are very thin and will be 
> mounted on thin flexprint (chip + flexprint ~100 um) the entire
> assembly (with mounting) will probably add less than 2 cm of 
> real-estate in the z direction behind the quartz tile, so that the 
> additional
> volume will be taken up entirely by the extent of the quartz light 
> guide assembly anyway.
>
> Thanks to the ever helpful group of people in Germany, who have 
> developed these chips, we (at Manitoba) have been able to gain a fair
> bit of familiarity with these detectors and have been working on the 
> development of readout PCBs and, more recently, looking at cooling
> needs for the chips. But of course, much more work is required to 
> achieve the full implementation for MOLLER. Nik Berger's group in Mainz,
> is working on using these detectors for actual tracking in the P2 
> experiment and has agreed to collaborate on this for MOLLER (for which I
> am really grateful). His group is also a main driver of the 
> development of these detectors for other experiments, such as Mu3e.
>
> I have also had a brief exchange with Yury about this and he has 
> expressed an interest as well and, of course, there is a lot of 
> experience
> with these detectors at Berkeley already.
>
> Given the amount of work that still needs to be done, and the somewhat 
> special nature of that work, I believe it is high time that we form
> a separate working group for this effort (not that anyone needs any 
> more meetings). It may be possible to discuss this work in the tracking
> meeting, but that may overburden those meetings (I am not sure, I 
> haven't been participating in those).
>
> If you have an interest in participating in this work, please let me 
> know and please indicate whether you are okay with forming a separate
> working group, with separate meeting times, or if this should be 
> discussed in the tracking detector meetings.
>
> Thanks,
>
> Michael
>