[Clas12_first_exp] DC setting

[Francois-Xavier Girod]

Dear all

run 4875 is currently not available. Please let me know if the following
list contains all the runs currently on tape to study the DCHV settings
4842
4843
4844
4845
4875

I am launching 4875 now

Best regards
FX

On Mon, Oct 8, 2018 at 11:50 AM Latifa Elouadrhiri <latifa at jlab.org> wrote:

> Dear FX and Mac,
>
> We will need also to cook if it is not already done Run 4875, this run
> (45nA)  was taken at DC HV: 9,10,10. At this HV setting DC were stable no
> trips. We should compare tracking efficiency from this run and any good
> recent run at 45 nA.
>
> If we are going to run at this current of 45 to 50 nA we should weigh in
> the DC setting.
>
> Best regards,
>
> Latifa
>
>
>
> On 10/8/18 2:25 AM, Rafayel Paremuzyan wrote:
>
> Dear FX,
>
> At high currents (I > 40 nA), the speared between different sectors is
> about x2 more than at lower currents,
> Is this because data at high current don't have enough statistics, or this
> is something else?
>
> Rafo
>
>
> On 10/07/2018 06:41 PM, Francois-Xavier Girod wrote:
>
> Dear all
>
> I looked at the ratio of events with positive time based tracks normalized
> at 2 nA vs beam current from the luminosity scan, and posted the
> corresponding plot, with separated sectors, here
> https://logbooks.jlab.org/entry/3605590
>
> At 45 nA I found a ratio of about 75% +/- 5% depending on the sector number
>
> Best regards
> FX
>
> Best regards
> FX
>
> On Sun, Oct 7, 2018 at 8:34 PM Rafayel Paremuzyan <rafopar at jlab.org>
> wrote:
>
>> Dear all,
>>
>> We didn't get much beam since yesterday,
>> MCC is still working on  resolving Accelerator related issues( RF
>> separator, RF zone 1L03).
>> I think there is no much to discuss for today.
>> Instead will be good if we work on the analysis of the special runs
>> (random, packed data, Lumi scans),
>> and in tomorrow's RC meeting discuss what decisions we should make in
>> terms of trigger/bit packing and the beam current.
>>
>> Rafo
>>
>>
>> On 10/06/2018 09:42 AM, Rafayel Paremuzyan wrote:
>> > Dear all,
>> >
>> > We took data up to 2:am this night and after that south linac had
>> > vacuum problems,
>> > which was solved half hour ago.
>> > We expect to get the beam soon, and the plan is to continue data
>> > taking through this weekend.
>> >
>> > There is no important items to discuss today.
>> > I will update you with the run status tomorrow by e-mail.
>> >
>> > Rafo
>>
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>
>
>
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