[Clas12_first_exp] Accelerator status/Hall access/cosmic, calibration runs/meeting today at 3pm

[Francesco Bossù]

Great plots!

If the energy loss you refer to the deviation in the bottom right plot,
I would say that before saying it is energy loss, we need to have the
alignment and geometry corrections.

Ciao

Francesco


On 03/05/2018 23:14, Francois-Xavier Girod wrote:
> For reference, we had found evidence for elastic scattering from the
> gas in the empty target using coincidence between forward carriage
> ECAL info and CVT (even with partial phi coverage) as documented here
>
> https://logbooks.jlab.org/entry/3517628
> https://logbooks.jlab.org/entry/3517631
>
> Also, those results did suggest significant energy loss for the
> protons in the central, but that was of course very early so things
> may be different now
>
> I will submit runs 2443 and 2449
>
> On Thu, May 3, 2018 at 1:40 PM, Mac Mestayer <mestayer at jlab.org
> <mailto:mestayer at jlab.org>> wrote:
>
>     Thank you, FX;
>
>     I will talk to you this afternoon or tomorrow.
>     I was not aware of this run, but it may be just what
>     I need.   - Mac
>
>     "mestayer at jlab.org <mailto:mestayer at jlab.org>", (757)-269-7252
>
>
>     On Thu, 3 May 2018, Francois-Xavier Girod wrote:
>
>         Dear Mac
>
>         Note that we have taken similar data at 2 GeV in the run range
>         2441 to 2449
>
>         Best regards
>         FX
>
>         On Thu, May 3, 2018 at 10:49 AM, Mac Mestayer
>         <mestayer at jlab.org <mailto:mestayer at jlab.org>> wrote:
>
>             Hello Lei and all;
>
>             If possible, I would like to have a short alignment run with
>             the torus turned off, but with the solenoid on.
>
>             This would reduce our background from very low momentum
>             electrons
>             and should be complementary to the data we have already
>             acquired (run 2467).  In that data, we can use the target
>             position
>             as a constraint, but as I said we have a large
>             contamination of
>             very low-momentum tracks.
>
>             An hour should give us good statistics.
>             Because of a doctor's appointment, I may not be able to be
>             at today's meeting, but please discuss this.
>
>                                 regards, Mac
>
>             "mestayer at jlab.org <mailto:mestayer at jlab.org>", (757)-269-7252
>
>             On Thu, 3 May 2018, Lei Guo wrote:
>
>             Dear All,
>
>
>                 Steve (PD) gave us an update this morning at the MCC
>                 meeting. If you read
>                 somewhere in the logbook that the beam might be back
>                 in four hours around
>                 noon — it won’t happen. The best case scenario would
>                 be sometime during the
>                 swing shift when we could expect beam to back. The
>                 network issue is nearly
>                 resolved. However, there are a lot of remaining items
>                 the accelerator team
>                 needs to address before they can deliver beam.
>
>                 This gives us an opportunity for Hall Access if anyone
>                 needs it. Please
>                 let PDL and me know if you do need it.
>
>                 Additionally, if anyone needs special runs that do not
>                 need beam, such as
>                 cosmic runs, LED runs, calibration runs, please let me
>                 and the shift leader
>                 know.
>
>                 Realistically, we have about two days of data taking
>                 left if all goes
>                 well. Therefore, we must have a meeting today at 3pm
>                 to discuss the
>                 remaining plans.
>
>                 Let’s meet at 3pm in the counting house then. Meeting
>                 link is below
>                 https://bluejeans.com/7572697303/
>                 <https://bluejeans.com/7572697303/>
>                 <https://bluejeans.com/7572697303/
>                 <https://bluejeans.com/7572697303/>>
>
>                 Lei
>
>
>
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