[Rgc] [EXTERNAL] Target Change Tomorrow (Sunday)?

Sun Oct 2 16:26:19 EDT 2022

According to PD, we don't know yet whether there will be maintenance next week or not. If the choice is between NH3/ND3, I think NH3 is better due to the accumulated statistics. There was an option about Carbon as well. But, in my opinion, NH3 is a better option. I hope we can decide before 7.45 AM tomorrow.

Zulkaida
________________________________
From: Rgc <rgc-bounces at jlab.org> on behalf of Christopher Keith <ckeith at jlab.org>
Sent: Sunday, October 2, 2022 6:52 AM
To: rgc at jlab.org <rgc at jlab.org>
Subject: Re: [Rgc] [EXTERNAL] Target Change Tomorrow (Sunday)?

A target change on Monday during the day shift will be fine.

I'll assume it will be either NH3 or ND3, depending on the relative amount of data on the two.  The RC should announce this at the morning meeting and let RadCon know that we'll need their support.  Request a Controlled Access if there are others that want to perform work in the hall.  Will there be an accelerator maintenance day later this week?

Chris

On 10/1/22 9:52 PM, Akbar, Zulkaida (za2hd) wrote:
Dear Sebastian,

You are right, the first 4 hours were wonderful (Run 17118 collected 100 M events in less than 4 hours) but now the beam has been off since 9.15. So, we will run CH2 IN until tomorrow around noon and then flip to OUT and run OUT configuration until Monday morning. And yes, let's discuss about what target to switch to on Monday and whether we should flip the solenoid polarity.

Zulkaida
________________________________
From: Sebastian Kuhn <kuhn at jlab.org><mailto:kuhn at jlab.org>
Sent: Saturday, October 1, 2022 10:41 PM
To: Akbar, Zulkaida (za2hd) <za2hd at virginia.edu><mailto:za2hd at virginia.edu>
Cc: rgc at jlab.org<mailto:rgc at jlab.org> <rgc at jlab.org><mailto:rgc at jlab.org>
Subject: Re: [Rgc] [EXTERNAL] Target Change Tomorrow (Sunday)?

Hi Zulkaida,

as far as I can tell, over the last 6 hours (since beam finally came back) we have taken 120 M events corresponding to 0.09 mC integrated charge. To get the desired quota on CH2, we would need nearly 8x as much - so it looks to me like tomorrow will be too early to switch targets. I would propose we keep running with CH2 until Monday morning. Meanwhile, we can use this thread to discuss what we should  do on Monday - what target to switch to, and whether to flip the solenoid polarity.

More tomorrow - Sebastian

On Oct 1, 2022, at 7:06 PM, Akbar, Zulkaida (za2hd) <za2hd at virginia.edu<mailto:za2hd at virginia.edu>> wrote:

Dear All,

I am sorry to make a new email thread. But there is good news. We got the beam, and it has been stable. In 4 hours, we collected ~100 M events (Run 17118). If the beam keeps stable, We will have ~ 400 M events (200 M HWP In + 200 M HWP Out) by tomorrow morning. So, should we change the target tomorrow during the day shift? What kind of target? Let's have a discussion and decision here.

Best Regards,

Zulkaida Akbar
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