[Sbs_gems] [EXTERNAL] UV Layer 4 Overview

[Ezekiel Wertz]

Hi folks I would just like to note that if we can come up with a ZIF
connector (INFN) to Panasonic we can try to use as many INFN APVs as I can
find or take off of layers with questionable detectors.

Zeke

On Friday, December 3, 2021, Liyanage, Nilanga K (nl8n) <nl8n at virginia.edu>
wrote:

>
> Also, I guess now we can borrow some APV cards from GEn-RP layers, right ?
> ------------------------------
> *From:* Sbs_gems <sbs_gems-bounces at jlab.org> on behalf of Liyanage,
> Nilanga K (nl8n) <nl8n at virginia.edu>
> *Sent:* Friday, December 3, 2021 4:48 PM
> *To:* Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu>; Jeffas, Sean (sj9ry) <
> sj9ry at virginia.edu>; sbs_gems at jlab.org <sbs_gems at jlab.org>
> *Subject:* Re: [Sbs_gems] [EXTERNAL] UV Layer 4 Overview
>
> Hi Sean, Kondo
>
> Anuruddha is contacting  Chris Cuevas about getting the 3-slot back planes
> fixed/
>
> Anuruddha: I am assuming that the adapters to flip the wire order in the
> cables are also being prepared, right ?
>
> We hope to get the APV cards in the next week or so
>
> Best
>
> Nilanga
> ------------------------------
> *From:* Sbs_gems <sbs_gems-bounces at jlab.org> on behalf of Gnanvo, Kondo
> (kg6cq) <kg6cq at virginia.edu>
> *Sent:* Friday, December 3, 2021 4:43 PM
> *To:* Jeffas, Sean (sj9ry) <sj9ry at virginia.edu>; sbs_gems at jlab.org <
> sbs_gems at jlab.org>
> *Subject:* Re: [Sbs_gems] [EXTERNAL] UV Layer 4 Overview
>
> Hi Sean,
> Yes, you are right. I forgot that the 4-slots backplanes were designed
> only for the UV layers, I don’t think removing them from the layers on BB
> and replace it with 3-slot is ever going to be an option for the current
> run up to end January. In addition to the lack of APV cards,  the 4th UV
> layer is out of the picture at least for now
>
> Best regards
> Kondo
>
> ------------------------------
> *From:* Sbs_gems <sbs_gems-bounces at jlab.org> on behalf of Sean Jeffas <
> sj9ry at virginia.edu>
> *Sent:* Friday, December 3, 2021 4:35 PM
> *To:* sbs_gems at jlab.org <sbs_gems at jlab.org>
> *Subject:* [Sbs_gems] [EXTERNAL] UV Layer 4 Overview
>
> Hi All,
>
> I just wanted to elaborate on the situation on the 4th UV layer, which is
> sitting in EEL and waiting as a spare. Each UV layer uses 12 4-slot
> backplanes and 4 3-slot backplanes. The 3-slot BPs are defective so we are
> using 4-slot BPs in their place. That means that for the three UV layers in
> BB right now we have used up every single 4-slot BP. Therefore we do not
> have the BPs to equip UV layer 4 to use as a replacement for anything.
>
> I am not familiar with the fixes needed for the 3-slot BPs, but assuming
> this is easy and can be done quickly, we still need to recover the 4-slot
> BPs from the UV GEMs in BB. This can probably be done by sliding the GEMs
> to the side in the BB frame, as we have done before, so we can reach them.
> Then we would need to place all the 3-slot BPs on the UV GEMs and test
> them. I would estimate we would need 2 days of downtime in the hall for
> this. Then we would need to add all the electronics to UV layer 4 back in
> EEL, and get it ready in one of the INFN frames and do a cosmic test on it.
> Then we would need another day of down time to swap it with J0 in the hall
> as we did with J2 earlier.
>
> Overall I think it would take two weeks of work to do all of this. Again I
> am completely assuming the fix to the 3-slot BPs is easy, I have no idea.
> Maybe Anu can elaborate. Also we will have to wait until the new APVs
> arrive to start any of this work. Between all of this and the holiday break
> I don't see this layer being used for anything during this run group.
>
> Also as a side note, I will have to dig through some old emails and notes,
> but I am fairly certain we accounted for all APVs and there are not enough
> to equip all 10 UVa SBS layers and 4 UV layers.
>
> Best,
> Sean
>


-- 
Ezekiel Wertz
Graduate Assistant
Department of Physics
College of William and Mary
ewertz at email.wm.edu
Mobile: +1 (717)-269-6488
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