[Sbs_gems] [EXTERNAL] UV Layer 4 Overview

[Thir Gautam]

Hi Anu and all,

There are 25 APV cards outside of 9th layer. Those APV cards are not tested yet. I believe that there are 20-25 APV cards on the 9th layer. Before getting Nilanga’s ordered we won’t have enough cards to populate a new uv layer.

Regards,

Thir

Sent from my iPhone

> On Dec 3, 2021, at 5:12 PM, Anuruddha Rathnayake <adr4zs at virginia.edu> wrote:
> 
> 
> Hi Nilanga,
> 
> Yes I am working on getting both of the fixes ready with Chris as soon as possible. 
> 
> Layer 9 for GEn-RP  (which is the only one that has not been put on the GEn-RP production frames) already donated 60 APVs for the 3rd UV layer. We can take the rest out of it too if necessary. Thir might be able to give a number on how many good APVs we have outside of that layer.
> 
> Best,
> Anu
> 
> 
>> On Fri, Dec 3, 2021 at 4:48 PM Liyanage, Nilanga K (nl8n) <nl8n at virginia.edu> wrote:
>> 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
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