[Bteam] BTeam notes: Tue 24 Jan 2012
Matt Poelker
poelker at jlab.org
Thu Jan 26 09:27:24 EST 2012
During the long shutdown, John Hansknecht will try to implement an idea
that will allow us to produce longer laser pulses, which as Mike T
points out, could improve transmission, reduce prebuncher gradient, and
eliminate tails, etc.,. Unfortunately, a longer laser pulse will not be
available during QWeak and the rest of the 6GeV run.
Matt
Todd Satogata wrote:
> Bteamers,
>
> Here are the notes from yesterday's weekly meeting. There was a lot of
> discussion about the
> tune time on Thursday that attempted to install a new M56 optics in
> the injection chicane
> but eventually was removed. Some issues were found in the model that
> will be addressed,
> a LEMI configuration problem was fixed, some optics anomalies (such as the
> disappearing/reappearing blown dispersion mismatch out of arc 2) need
> understanding.
> We learned important things during that tune time, but we will be more
> efficient if we
> have more time to plan and double-check for tuning; Yves's summary at
> the end of what
> worked and what didn't will be helpful for the planning of the 5-pass
> spin-up; a plan is
> being developed that will be discussed and hopefully scheduled by this
> week's beam
> studies scheduling meeting on Friday.
>
> Alex Bogacz has graciously agreed to chair the BTeam meeting while I'm
> on travel
> to SLAC Jan 26-Feb 1 inclusive.
>
> -Todd
>
>
> BTeam-2012-01-24
>
>
> 1 Optics on Call Report/Schedule
>
> * Rotates at BTeam (10:00 Tuesdays)
> * Medium-term machine development
> o DONE Write 5-pass spin-up ATLis (Jay, a11894
> <https://cebaf.jlab.org/atlis/task/11894>), relies on ARC9
> box supply repair (ongoing)
> * 17 Jan-24 Jan: Vasily/Yves (Outgoing)
> o SL has still been running few degrees off crest to reduce
> Compton backgrounds (Jay)
> o Hall B sensitivity to energy drift of some concern (Tief)
> o Mon 23 Jan Add M56 optics in injector (Yves/Jay, a11924
> <https://cebaf.jlab.org/atlis/task/11924>)
> + Not successful, see Yves's entry at e1661381
> <https://cebaf.jlab.org/elog/entry/1661381>
> + HGAP for inj chicane dipoles will be updated; 0L/0R
> optics plan in the works
> + 12h of tuning time: what was gained? How are we
> accountable for that time?
> # Who owns the process of unscheduled tuning?
> Optics or plan owner should be focus; PD
> schedules time
> # Scheduling for studies <1h later makes things
> rushed, perhaps hours of inefficiency
> # OptiM to elegant translation can use better
> efficiency (at least yesterday)
> # High sensitivity of Compton halo to 1L02 quad
> was found at end in current configuration
> # Now running 2.5 degrees off crest in SL,
> better than the 6+ degrees over weekend
> # We're very likely on the edge of something,
> including scraping, based on large sensitivities
> # RayTrace would provide optics, may also well
> provide an aperture check (Tief)
> # Spot was a lot tighter in 1A with the M56
> improvement, so we will likely want to use
> this in Feb
> # Is a longer laser pulse feasible for 180uA for
> better injector transmission/Hall B? (Tief)
> # Alex: Can redesign an M56 optics with a
> stronger 1L02 quad setting for potentially
> improved stability
> # Underlying cause of arc2 dispersion match
> blown? Was seen in previous week as well
> (Jay/Spata/Tief)
> # DONE Jay has changed LEM config file for NL to
> set 1L02 quad to 521.6 (as of AM Jan 24 2012)
> # TODO injector rematch with HGAP in 0R dipoles
> (Michele/Yves, report Feb 02 BTeam)
> # TODO Address blown arc2 dispersion match
> during Jan 25 beam studies recovery (Optics)
> # TODO Planning group for M56:
> Yves/Jay/Tief/Alicia/Alex/Ed/Geoff/Yuhong
> * 24 Jan-31 Jan: Ed/Alex (Oncoming)
> o TODO Readdress injection matching to NL, SL gang phase,
> Hall C Compton
> o TODO Restore SL MOMOD after SL on crest, confirm good Hall
> C Compton rates (Tief/ops)
> o TODO Diagnose intermittent problems in NL MOMOD (Musson?
> Tief? Plawski?)
> * 31 Jan-07 Feb: Yuhong/Geoff
> o 5-pass spin-up schedule? Mid-February for Hall A, but
> early Feb for Hall B shift?
> * 07 Feb-14 Feb: Balsa/Todd
> * 14 Feb-21 Feb: Fanglei/Mike Spata
> * 21 Feb-28 Feb: Todd/Jay
>
>
> 2 Measuring Bunch Length using 1A Sync Light Monitor (Tief)
>
> * New BTeam elog entry on this procedure: e1661304
> <https://cebaf.jlab.org/elog/entry/1661304>
> * Done capturing images from datacube; online bunch length
> application may be resurrected (Michele/Tief)
> * Arne believes this will be resurrected when we have pure digital
> cameras for 12 GeV
> * TODO Prioritize and projectize for long down (Arne)
>
>
> 3 C100 Status
>
> * 26/52/79 Hz signal on 1/4 cryo drive gradient/phase (Suleiman/Spata)
> * Beam studies rescheduled for Wed 25 Feb
>
>
> 4 Beam Studies Report 18 Jan 2012
>
> * Studies scheduled 08:00-20:00 (on time)
> o a11858 <https://cebaf.jlab.org/atlis/task/11858> 0.0 C100:
> Search for 79 Hz (Parisitic, Suleiman/Spata; strong 52 Hz
> on 1/4 cryo drive gradient/phase)
> o No other studies accomplished due to box supply failures,
> repair
>
>
> 5 Beam Studies Scheduled 25 Jan 2012
>
> * TODO Submit ATLis items for desired beam studies for next week
> (25 Jan)
> * Same studies as last week based on lost time to box supply failures
> * Studies scheduled 08:30-20:30
> o *[X]* ------ 1.0 Optics: Fopts/allsaves
> o *[X]* a11882 <https://cebaf.jlab.org/atlis/task/11882> 8.0
> C100: Stability testing (Hovater, Spata, etc, full
> gradient on both C100s, 10uA)
> o *[X]* a11865 <https://cebaf.jlab.org/atlis/task/11865> 1.0
> Modeling: RayTrace validation (Bodenstein, Tief)
> o *[X]* a11885 <https://cebaf.jlab.org/atlis/task/11885> 0.0
> PePPo: Modeling (Grames, Contingency)
> o *[X]* a11849 <https://cebaf.jlab.org/atlis/task/11849> 0.0
> Mott: Mott DAQ Test (Suleiman, Contingency)
> o *[X]* ------ 2.0 Optics: Restoration
> * TODO Optics should write notes, observations of fopt/etc to
> Bteam elog
> o Include pathlength check (pathlength was good Mon day)
>
>
> 6 Next week
>
> * Alex Bogacz has graciously agreed to chair while Todd is on travel
> * Hall B to 5th pass ~ Feb 1?
>
>
> 7 From last week: Evaluate possibilities of Krest during beam
> restoration (Okay)
>
> * Takes more like 4h to run through both linacs to get decent
> results (Terry)
> * But Hall C doesn't get good data while Krest is running either
> (but Hall B can)
> * Perhaps part of 2h can be a manual touch-up of cresting (15 min
> total, 2 operators)
> o TODO Todd has emailed Noel to see if manual touch-up is
> acceptable weekly retune
>
> ------------------------------------------------------------------------
>
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--
Matt Poelker
Jefferson Lab
MS Bldg 5A, Rm 500-17
12000 Jefferson Ave.,
Newport News, VA 23606
poelker at jlab.org
757-269-7357 office
757-897-9408 cell
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