[Clas12_rgb] Data taking status. NO RC meeting today.
Valery Kubarovsky
vpk at jlab.org
Thu Mar 14 09:07:11 EDT 2019
Hi All,
I talked with Bob today. He said that the transition from one target to another will take around 6 hours.
The natural time to empty and fill target is Wednesday day shift during beam studies if we don't want to lose beam time for this procedure.
The accelerator folks told me today one more time that the Parity Quality Beam (PQB) tests on Monday and Tuesday in Hall-A
will not affect the beam quality and beam polarization in Hall-B. I suggest to continue data taking up to Wednesday morning
without any interruption.
We are smoothly taking data during last 24 hours (see attached plot).
We will not have RC meeting today until somebody has urgent request for discussion.
Regards,
Valery
RG-B RC
On 3/13/19, 12:06, "Silvia Niccolai" <silvia at jlab.org> wrote:
Hi all,
I propose to postpone the Moeller run to after those tests. And if we don’t get the extension, as Valery says we may leave it to RGA.
Valery is also right in leaving also the ET run to RGA, or to just before it starts, as the target will have to be emptied anyway...
So, my bottom line is: the only “special run” we can do right away is the random trigger one. For the rest, let’s wait to know about the extension, hopefully we’ll know before Monday.
Best regards,
Silvia
Sent from my iPhone
> On 13 Mar 2019, at 16:59, Stepan Stepanyan <stepanya at jlab.org> wrote:
>
> Hi Valery,
>
> As far we know tests on Monday/Tuesday are for parity quality beam studies which means they will change injector settings to minimize of example transverse component of polarization. Ideally you expect all changes to be reverted and injector be back to its original state. From previous experience, this may not be true. But, you can argue that it then makes more sense then to do Moller run after these tests. It is kind of judgment call.
>
> Regards, Stepan
>
>> On 3/13/19 11:53 AM, Valery Kubarovsky wrote:
>> Hi Stepan,
>>
>> Do we expect some accelerator configuration changes on Monday-Tuesday?
>>
>> Valery
>>
>> On 3/13/19, 11:50, "Clas12_rgb on behalf of Stepan Stepanyan" <clas12_rgb-bounces at jlab.org on behalf of stepanya at jlab.org> wrote:
>>
>> Hi Silvia,
>> I suggested to do Moller run, just because I do not know what kind of machine we will get back from Monday/Tuesday tests. But of course we can wait and see how things will develop and do Moller run either Monday or Tuesday.
>> Remember, we have only one measurement at this angle that was done as part of spin dance.
>> Stepan
>> > On Mar 13, 2019, at 11:33 AM, silvia at jlab.org wrote:
>> >
>> > Hi Jerry/Valery,
>> > unfortunately tonight I won't be able to attend the RC meeting.
>> > I have a couple of comments on the plan:
>> >
>> > 2) Do we really need to have a Moeller run this week? We had the spin
>> > dance on Friday, and since I don't think anything changed at the
>> > accelerator level, did it?
>> >
>> > Important thing: last I have made an official request to RGA of a few days
>> > (5 is the latest figure) of extension to make up for the losses of beam
>> > time we suffered during this spring run. The CCC discussed it, asked for
>> > feedback, I provided it yesterday, and now I am waiting for a final reply
>> > on this.
>> >
>> > If we get an extension, it would maybe make sense to wait until onday or
>> > Tuesday for the Moeller.
>> > Is there any chance for any beam Mon and Tue or not at all? If there was,
>> > maybe we could leave the Moeller to then, but this is just in case we
>> > obtain the extension. Otherwise, we could probably have another Moeller
>> > before the weekend.
>> >
>> > 3) I guess we are due an ET run at some point, as the last one was ten
>> > days ago.
>> >
>> > If we get the ~5 days extension, we'll have to find an RC, but we
>> > shouldn't discuss this until we know it for sure.
>> >
>> > Best regards,
>> > Silvia
>> >
>> >
>> >> Hi Folks,
>> >>
>> >> We WILL have an RC meeting today to discuss some RGB plans/issues for the
>> >> remainder of the week. The tentative agenda is the following. Starting
>> >> time will be 2:00 pm, but we may be delayed by people (like me) attending
>> >> the weekly MCC meeting scheduled for 1:30 pm.
>> >>
>> >> 1. Plans for random trigger run.
>> >>
>> >> 2. Moller run.
>> >>
>> >> 3. Should we have another empty target run?
>> >>
>> >> 4. AOB.
>> >>
>> >> BlueJeans address: 230805731
>> >>
>> >> Accelerator continues to give us stable beam and we push ahead collecting
>> >> more data.
>> >>
>> >> The run plan is summarized below and posted on the wiki.
>> >>
>> >> 1. Maintain production running as much as possible.
>> >>
>> >> 2. Random trigger run.
>> >>
>> >> 3. Moller run this week.
>> >>
>> >> 4. Empty-target run perhaps later in the week.
>> >>
>> >> Let me know what you think.
>> >>
>> >> Jerry
>> >>
>> >>
>> >> -----
>> >> Dr. Gerard P. Gilfoyle
>> >> Physics Department
>> >> University of Richmond, VA 23173 USA
>> >> e-mail: ggilfoyl at richmond.edu
>> >> phone: 804-289-8255
>> >>
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>> >
>> >
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