[Sbs_gems] [EXTERNAL] Fwd: Fwd: GEM HV scan with new resistors

[Anuruddha Rathnayake]

Hi Kondo,

This is what Sean had shared in the Slack channel with us just a
short while ago.

Anu

On Sat, 20 Nov 2021, 14:20 Gnanvo, Kondo (kg6cq), <kg6cq at virginia.edu>
wrote:

> Hi Andrew,
>
> Is there somewhere one can have a look at the weird noise issue you are
> alluding too?
>
> Thanks
>
> Kondo
>
>
>
> *From:* Sbs_gems <sbs_gems-bounces at jlab.org> *On Behalf Of *Andrew Puckett
> *Sent:* Saturday, November 20, 2021 12:54 PM
> *To:* Jeffas, Sean (sj9ry) <sj9ry at virginia.edu>
> *Cc:* Sbs_gems at jlab.org
> *Subject:* Re: [Sbs_gems] [EXTERNAL] Fwd: Fwd: GEM HV scan with new
> resistors
>
>
>
> good idea. Tracking and efficiency analysis should be ready to go, up to
> this weird new noise issue we are seeing
>
> puckett.physics.uconn.edu
>
>
>
> On Nov 20, 2021, at 10:32 AM, Sean Jeffas <sj9ry at virginia.edu> wrote:
>
> 
>
> Hi All,
>
>
>
> Looks like Brad accidentally only sent this message to a few of us. Since
> we have so much time I think we can take at least two data points every day
> using cosmics. So we will try to do that.
>
>
>
> Best,
>
> Sean
>
> ---------- Forwarded message ---------
> From: *Brad Sawatzky* <brad at swatter.net>
> Date: Fri, Nov 19, 2021 at 8:15 PM
> Subject: Re: Fwd: [Sbs_gems] GEM HV scan with new resistors
> To: Ezekiel Wertz <ewertz at email.wm.edu>, Brad Sawatzky <brads at jlab.org>
> Cc: Thir Gautam <tns.gautam at gmail.com>, Xinzhan Bai <xb4zp at virginia.edu>,
> Jeffas, Sean (sj9ry) <sj9ry at virginia.edu>
>
>
>
> We will not have any beam until Tuesday swing at the earliest, probably
> later.
>
> If this scan can be done with cosmics (slowly...) Then perhaps it may be
> worth doing some of this over the weekend?
>
> On November 19, 2021 7:01:03 PM EST, Ezekiel Wertz <ewertz at email.wm.edu>
> wrote:
>
> Hi Brad,
>
>
>
> I think you are on the GEM mailing list so you probably saw this
> discussion. At the time of the RC meeting this afternoon I thought the
> table of points for the efficiency scan was set in stone. But that seems
> less clear to me now. Anyway I know we will not be going above 3653 (4100
> equiv) V and I suspect we will go down to 3385 (3800 equiv) V via the
> attached email. Thir is currently the GEM on-call and his number is on the
> whiteboard. I know Xinzhan is on some shifts over the weekend. So depending
> on the timing of beam return and this task he might be able to do it as
> well. It's not entirely clear to me if Kondo and Nilanga have come to a
> consensus on the best form of the efficiency scan they would want. But
> maybe the UVa folks have more knowledge that I am unaware of.
>
>
>
> Zeke
>
>
>
> ---------- Forwarded message ---------
> From: *Holly Szumila-Vance* <hszumila at jlab.org>
> Date: Fri, Nov 19, 2021 at 4:09 PM
> Subject: [Sbs_gems] GEM HV scan with new resistors
> To: sbs_gems at jlab.org <sbs_gems at jlab.org>
>
>
>
> Hi Kondo, Nilanga, all,
>
>
>
> I realize the voltage scan doesn’t need good alignment, but right now the
> alignment was showing the new HV layer with about 14% occupancy, which is
> why I brought up the point about making sure alignment will be somewhat
> ready. Andrew says it will be, so we should be able to see in real time if
> we are getting plateaus.
>
>
>
> The HV scan we completed previously consisted of running:
>
> 3385 (3800 equiv)
>
> 3430 (3850 equiv)
>
> 3475 (3900 equiv)
>
> 3519 (3950 equiv)
>
> 3564 (4000 equiv)
>
> 3608 (4050 equiv)
>
> 3653 (4100 equiv)
>
> 3697 (4150 equiv)
>
> 3720 (4175 equiv)
>
>
>
> Can we reduce some of these points? Should we stay below 3653V or some
> other limit? These values correspond to the divider before modification.
>
>
>
> Thanks,
>
> Holly
>
>
>
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>
> --
> Sent from my Android phone with K-9 Mail. Please excuse my brevity.
>
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