1. Hall A Gmp / DVCS Fall preparation September 16 th 2014 Hall A meeting Alexandre Camsonne 1

2. General Power outage at counting house last week Slow progress for DAQ, Compton, Cryo … Power should be stable in Hall Computers powered up since Friday Power back to counting house maybe next week Use new accelerator HALOG as default https://logbooks.jlab.org/book/halla 2

3. Left HRS Mostly commissionned in March HV switched to Raspberry pi Left to be done – Check buffering ( Alexandre, Kalyan ) – Reorganize normalization scalers, helicity gated ( Bob, Kalyan ) – Test EDTM ( Longwo, Kalyan, Barak ) – How to / documentation 3

4. Beam line BCM – 1 MHz receiver – New receiver built Unser – Current source installed BPM – Commissionned in March ARC ? HARPS ? 4

5. Polarimetry Helicity signals fed to TS ( Buddhini ) : need to be tested – Plan for 30 Hz in time Helicity scalers used to monitor charge asymmetry ( tweak by hand regularly for charge symmetry ) Moller – Commissionned March – Sasha and Roman on site November 1 st 5

6. Compton (Dave Gaskell) Cavity – Slow progress with outages – Laser and PPLN working – Will do alignment when power comes back Photon detector – CMU has lead tungstate, CsI in place for now – Photon vacuum tube manufactured Chicane – Electron detector chamber modified – Dipole chamber being leaked checked 6

7. Target Only scattering chamber installed Target ladder – 15 cm 3 inches Silviu cell – Standard 3 inches 15 cm and 4 cm – Optics – Solid target Wire target planned to be installed, march TOSP resubmitted http://hallaweb.jlab.org/12GeV/experiment/E12-07- 108/Collab_Meetings/Sept_4_2014/Target_Status.pptx 7

8. 15 cm Silviu 4 cm LH2 15 cm LH2 4/15 cm Dummy Optics Solid Run with 2 loops filled with H2 Use D2 tank for H2 Right now it is MT 8

9. DVCS Stand in Hall RG213 cabled and tested 3 VME64X, 1 VME crate for trigger installed TI installed and plug to TS CPU on network, on shared directory and user for DVCS OSP submitted, waiting for feedback 9

10. Remaining task list GMp / HRS Wire target ( Meekins ) Test EDTM ( Longwo, Barack, Kalyan ) Migrate HV settings to rpi Sieve slit ( Eric Christy ) Check buffering (Alexandre, Kalyan) Check filesplitting(Alexandre, Kalyan) Check replay warming message Option : implement TDC window suppression ( Kalyan ) 10

11. Remaining tasks list DVCS Calorimeter 11 block repair /tests ( ODU end of this week ) Calorimeter stacking / cabling ( ODU, IPN : 3 days ) DVCS HRS trigger setup and timing ( Paul, Alex 1 week ) DVCS calorimeter cabling to electronics ( Paul, Camille, Mongi, Norman 3 days ) Calorimeter readout ( Paul Norman Alex 3 days ) Deadtime / high rate tests ( Paul Norman Alex 1 day ) Display/decode DVCS detector ( Carlos 1 day ) EPICS / HV check ( Kijun 1 day) Most work in parallel : plan to be done by end of the month 11

12. Conclusion GMp mostly ready – Need check UNSER, wire target, EDTM DVCS installation in progress – Electronics /trigger setup – Block repairs – Calorimeter stacking – should be ready by end of the month 12