[Sbs_gems] [EXTERNAL] Upper limits in terms of beam current for the GEM study planned for tomorrow

[Gnanvo, Kondo (kg6cq)]

Ok,
I just wanted to check with you, I remember for SBS-8, we were taking data with LD2 @ 5 uA and efficiency was still pretty high, so I am surprised that your plots show a nonlinear current increases starting at 3 uA with LH2.
But if you are sure about that. Then that is fine

Best regards
Kondo

From: Anuruddha Rathnayake <adr4zs at virginia.edu>
Sent: Sunday, February 6, 2022 12:41 PM
To: Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu>
Cc: sbs_gems at jlab.org; Arun Tadepalli <arunts at jlab.org>
Subject: Re: [Sbs_gems] [EXTERNAL] Upper limits in terms of beam current for the GEM study planned for tomorrow

Hi Kondo,

I just double checked. The titles of the plots in the above log entry are correct.

SBS-8 -> LH2
SBS-11 -> LD2

Best,
Anu

On Sun, Feb 6, 2022 at 12:34 PM Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu<mailto:kg6cq at virginia.edu>> wrote:
Hi Anu,
The title for all your plots shows LH2 but even when some studies where done with LD2. Could you confirm which target these studies where performed at for SBS-8 and SBS-14?
Thanks
Kondo

From: Sbs_gems <sbs_gems-bounces at jlab.org<mailto:sbs_gems-bounces at jlab.org>> On Behalf Of Anuruddha Rathnayake
Sent: Sunday, February 6, 2022 9:52 AM
To: sbs_gems at jlab.org<mailto:sbs_gems at jlab.org>
Cc: Arun Tadepalli <arunts at jlab.org<mailto:arunts at jlab.org>>
Subject: [Sbs_gems] [EXTERNAL] Upper limits in terms of beam current for the GEM study planned for tomorrow

Dear All,

There is a discussion going on between our current RC (Arun) and some of us here in Jlab about what would be the beam current limits that we should adhere to, if it is possible to come into such a limit looking at the observations we have made so far.

I'm attaching the GEM linearity studies we have done so far, if that helps to make a decision. https://logbooks.jlab.org/entry/3932489

I believe if you use linearity studies done at SBS-11, that would be the best as our current spectrometer angles at SBS-9 are similar to what we had at SBS-9 (Please correct me if I am wrong, I know this more of as a word of mouth rather than referring to any official documentation).

Best,
Anu
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