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

Mon Oct 3 06:03:46 EDT 2022

Just for info:

Beam has been down since 4:20, see RSEP8A tripped off 
https://cebaf.jlab.org/dtm/open-events?event_id=17072

On 02.10.22 20:23, Christopher Keith wrote:
> Yes, switch tomorrow to carbon will be ok.
>
> Chris
> ------------------------------------------------------------------------
> *From:* Sebastian Kuhn <kuhn at jlab.org>
> *Sent:* Sunday, October 2, 2022 6:00 PM
> *To:* Akbar, Zulkaida (za2hd) <za2hd at virginia.edu>
> *Cc:* Christopher Keith <ckeith at jlab.org>; rgc at jlab.org 
> <rgc at jlab.org>; James Brock <jbrock at jlab.org>; James Maxwell 
> <jmaxwell at jlab.org>
> *Subject:* Re: [Rgc] [EXTERNAL] Target Change Tomorrow (Sunday)?
> Looking at the present whiteboard, it appears that the startup for 
> Hall A is now scheduled for TUESDAY, 10/4. The next potential for 
> PLANNED downtime is Monday, 10/10 (Hall A configuration change) or the 
> following Tuesday (Pass change). Of course, with severe flooding and 
> more nasty weather headed our way, we can’t be too sure if/when the 
> beam will be down even sooner than Tuesday. However, if things remain 
> as presently scheduled, my vote would be to
> 1) Change to a C target tomorrow, Monday (at a mutually agreeable time 
> for the target group), and
> 2) Change to NH3 while also reversing the solenoid polarity on Tuesday.
>
> So we need to tell RadCon that we need them both days. Assuming it’s 
> o.k. with the target folks, we should shoot for the canonical 9:00 
> a.m. start (bring Hall to controlled access, have RadCon do their 
> thing, then start target work). Does this sound o.k.?
>
> - Sebastian
>
>> On Oct 2, 2022, at 4:26 PM, Akbar, Zulkaida (za2hd) 
>> <za2hd at virginia.edu> wrote:
>>
>> 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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>>>
>>>
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