<div dir="ltr">I will make the replacements in an hour or so. If you take LED data and see any suspicious channels, let me know and I can replace them anytime during the access this week.<div><br></div><div>Do you know of any other suspicious channels? I got my list by checking the scalers a week or two ago. I will need to check signals on the scope to make sure they're bad.</div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Nov 28, 2018 at 11:48 AM Alexander Somov <<a href="mailto:somov@jlab.org">somov@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Thanks a lot Colin for the update (and quick response). It would<br>
be great if can replace these bases during this week (the hall<br>
will be closed later today and will be re-opened tomorrow).<br>
<br>
We can take LED data today and check the status.<br>
<br>
Cheers,<br>
Sasha<br>
<br>
<br>
On Wed, 28 Nov 2018, Colin Gleason wrote:<br>
<br>
> Hi Sasha,<br>
><br>
> I suspect there are around 5-10 bad/suspicious FCAL channels. I know of 2<br>
> that are dead and 3 that are just showing noise. I will replace these after<br>
> lunch. Someone either forgot to turn on the FCAL communications yesterday<br>
> or has turned it off today, so I do not know all channels. The ones I know<br>
> of are in (X,Y):<br>
> bad signal:<br>
> 16 8<br>
> 26 0<br>
> 27 -6HV:<br>
> -8 28<br>
> 14 21<br>
><br>
> There are likely a few bases whose HV is below their set point. We usually<br>
> keep these in the FCAL until they die, or, if we have enough spares<br>
> available, will swap them out.<br>
><br>
> Currently we have 16 spares ready to go in, with more ready to be repaired<br>
> by Chris and Nick. The base failure rate had dropped to less than 2 per<br>
> week by the end of the run, so we should be able to manage replacements<br>
> through the rest of the Fall run. I think Chris and Nick have been busy<br>
> with installation, but once that is complete we can get them to repair more<br>
> bases for the spring.<br>
><br>
> -Colin<br>
><br>
> On Wed, Nov 28, 2018 at 11:25 AM Alexander Somov <<a href="mailto:somov@jlab.org" target="_blank">somov@jlab.org</a>> wrote:<br>
><br>
>><br>
>><br>
>> Hi Colin,<br>
>><br>
>> Could you update us on the status of bad (suspicious)<br>
>> channels in the FCAL.<br>
>><br>
>> Could you send a list of bad/suspicious channels<br>
>><br>
>> Did you have a chance to replace bases during<br>
>> this shut down ? How many spare bases do you have ?<br>
>><br>
>> We'll need to take LED data when you turn HVs on.<br>
>><br>
>> Thanks,<br>
>> Sasha<br>
>><br>
>><br>
><br>
> -- <br>
> Colin Gleason<br>
> Postdoctoral Fellow<br>
> Indiana University<br>
> Department of Physics<br>
><br>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Colin Gleason</div><div>Postdoctoral Fellow<br>Indiana University <br>Department of Physics</div></div></div>