Run Coordinator Report February 5 to 8 Stepan Stepanyan JLAB 1

HPS 2016 S. Stepanyan, Preparing for spring run 2  Run is scheduled from February 5 to March 14, weekends only  The second energy run, again 1 pass beam but at 2.3 GeV  HPS has the hall from 3 pm on Friday till 7 am on Monday.  Hall-B/HPS is the priority hall over the weekends  Most of the data taking will be with 200 nA beam on r.l. W target  There will be several calibration runs such as – luminosity scans, carbon target, empty target, “straight through” (chicane off) runs, etc. ParameterValue Beam energy (1 pass)2.3 GeV Beam currentup to 300 nA Current stability< 10% Beam profile at the target σxσx < 250  m σyσy < 50  m Beam position stability in x < 100  m in y < 50  m

Goals for Weekend-I (Feb. 5 – 8) S. Stepanyan, Preparing for spring run 3  Complete 1-pass beam setup to Hall-B  Establish production quality beam on target  Complete beam commissioning, BPM calibrations, commissioning of orbit locks, FSD system, positioning of collimator (see procedures on Run wiki for details)  Start commissioning of HPS systems, chicane setup, rate studies, occupancies (see subsystem commissioning plans) Almost all done!

Feb. 4 & 5 S. Stepanyan, Preparing for spring run 4  February 4:  Documentation was complete, run certificate was assigned  HCO for all systems (exception beamline vacuum) was complete  Pumping downstream of the tagger started  February 5:  Vacuum beamline was restored but no vacuum around 2:30pm due to pump issue. HCO for vacuum by operations still not complete  Issue with Hall-B vacuum reading in EPICS prevented hall to go to beam permit at 3 pm. Work in the hall must be organized in such way that at 3pm every Friday beam line and hall are ready to close!  Hall went to controlled access at 6:30pm. Problem with the vacuum was resolved around 9:30pm.  Beam tune started, close to midnight ops was ready to send beam to tagger dump.

February 6 S. Stepanyan, Preparing for spring run 5  Started swing shift with ongoing work on beam dispersion and optics  At 4:20 am got first glimpse of CW beam to the tagger dump  Some beam profile studies and beam tuning with 2C21 and 2C24 (tagger) harps till 10:30 am (beam was too intermittent to go faster)  Experts came in for nA BPM calibrations, started at 10:30 am, work was not finished due to a vacuum problem in the machine at around noon (experts were gone when beam came back)  When beam came back Michael T. continued tuning the beam to the tagger till 6 pm. Beam profiles on 2C21 and 2C24 were acceptable for the commissioning plan  At 6:30 pm started degauss the tagger magnet

Beam profiles at 2C21 and 2C24 harps S. Stepanyan, Preparing for spring run 6

February 6 – 7 S. Stepanyan, Preparing for spring run 7  First beam on Faraday cup viewer was delivered at 7:00 pm  At 9:30 pm positioning of SVT protection collimator was done (perform scans for determination of the widths and centers of the holes)  Found a problem with 2H00 readback, orbit locks were engaged with only 2H02 (worked at some level)  Continued with beam tune on 2H02A harp with Michal T.,  At 1:30 am machine was delivering CW beam to 3 halls for the first time  Had to postponed beam profile studies due to a problem with 2H02A harp. Motor stuck half a way and want move up or down  At 2:40 am beam was good enough (on the viewer) to turn ECal ON  At 3 am cold box tripped at CHL, machine went down. Hall went to controlled access to address issues with 2H02A harp and IOC classc8  No engineering on call! Came at 6am to investigate the issues. Both problems were resolved 7:30am

February 7 S. Stepanyan, Preparing for spring run 8  Beam was restored on at 1 pm (too intermittent)  Beam had a tail requiring retune at the injector  At 4:30 pm got more-or-less good beam on 2H02A harp  Expert were called in to fixed and calibrated both striplines, 2H00 and 2H02  After BPM calibrations, beam orbit was optimized using rates on halo counters  At 7pm orbit was tuned and locked, reasonable beam profile at 2H02A.  Getting ready to turn on HPS

February S. Stepanyan, Preparing for spring run 9  At 11:00 pm chicane was ON, beam was slightly to right (~2 mm) on the screen  Perform ECal rate studies without and with target. Observe somewhat lower rates than expected (350 kHz at 150 nA, x2 lower than expected)  No beam from 1:30 am to 4:30 am RF issues  Continued with FSD system commissioning and trigger rate studies  At 7:00am hall was in restricted access

S. Stepanyan, Preparing for spring run 10

S. Stepanyan, Preparing for spring run 11

S. Stepanyan, Preparing for spring run nA, no target, chicane OFF 200 nA, 4  m W, chicane ON – too low rates (x2)?

ecalDiagGUI S. Stepanyan, Preparing for spring run 13