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

[Christopher Keith]

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>
> *Sent:* Saturday, October 1, 2022 10:41 PM
> *To:* Akbar, Zulkaida (za2hd) <za2hd at virginia.edu>
> *Cc:* rgc at jlab.org <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> 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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>
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