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Hall A Gmp / DVCS Fall preparation

September 16th 2014Hall A meeting

Alexandre Camsonne

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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 defaulthttps://logbooks.jlab.org/book/halla

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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

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Beam line

• BCM– 1 MHz receiver– New receiver built

• Unser– Current source installed

• BPM– Commissionned in March

• ARC ?• HARPS ?

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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 1st

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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

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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

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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 H2Right now it is MT

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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

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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 )

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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

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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