1. Comments from Physics Division Rolf Ent Associate Director for Experimental Nuclear Physics SOLID collaboration meeting, February 03, 2012 Thomas Jefferson National Accelerator Facility CLEO Magnet Update Electronics Update 2 nd SOLID Brainstorming Session with Physics Division

2. CLEO Magnet: Contact between Cornell and JLab Engineering Division established DOE/NP sensitive about any additional scope/MIE in view of uncertain budget outlook CLEO magnet appears good match to SOLID needs per 2 nd SOLID brainstorming session with Physics Division Due diligence w.r.t. cryogenic system of magnet needed  engaged engineering division  brought into contact with relevant Cornell staff (lab tech lead, activity coordinator, cryo expert) Productive phone meeting between Cornell representatives and JLab engineering & cryogenics staff (Thursday Jan. 12) Magnet seems to be well taken care of, also in decommissioning Cornell will look at sending us copies of drawings of the magnet, cryogenics and controls, and hunt for documentation on procurement specs and shipping tools. Jim Alexander: JLab are first and most serious customer

3. Thomas Jefferson National Accelerator Facility Page 3 Production Board Quantities – per C. Cuevas Board ID Hall D (Spare) Hall B (Spare) Hall AHall C‘Physics’ FEG DAQ Totals $FY12 SOLID FADC250 350 * (36) 310 ** (25) 4 4616726210 Trigger Interface 57 (8) 64 (8) 22613130 Signal Distribution 57 (8) 49 (9) 22211230 Crate Trigger Processor 23211224919 Sub-System Processor 814111253 Global Trigger Processor 2211171 Trigger Distribution 10 112244 Trigger Supervisor 2211171 50  Hall A DAQ upgrade (16 of which used for SBS) 50

4. Thomas Jefferson National Accelerator Facility Page 4 Production Board Notes – per Chris Cuevas Other 12GeV Proposed Detectors ** CLAS12 ‘baseline’ FADC250 board count is 239 - Central Neutron Detector is 288 channels or 18 boards - Forward Tagger (PbWO4) calorimeter is 424 channels or 28 boards - Total on previous page is 310 boards - So, 25 boards are spare * Hall D ‘baseline’ FADC250 board count is 282 - BCAL readout Change Request adds one layer or 32 boards - Total on previous page is 350 - So, 36 boards are spare + Hall C ‘baseline’ FADC250 board count for SHMS is 16 - HMS is 13 boards, plus 2 spares  ordered 15 spares - User request of ~40 boards through NSF/MRI for (PbWO4)  0 spectrometer Note: In FY12 thirty-five (35) Pre-Production units were purchased and will most likely not be used for the final hall installations. These units are functionally equal to the production units, but need a few very minor circuit corrections.

5. Thomas Jefferson National Accelerator Facility Page 5 Electronics Summary Spare FADC250 modules need to be used/shared intelligently Pre-production modules can be used (35) Hall D spares + Hall B Spares + Halls A, C + Physics + pre-production = 162 (+46 + 40?) boards We hope to invest some capital funds in FY12  FY13 for the relevant components of fast pipelined electronics that may become obsolete, and establish a pool of components for all Halls to share Electronics Group has already planned for infrastructure needed for spares storage and repair/testing. Will work closely with DAQ and Hall Groups to maintain spare modules. Need to plan for intelligent module/spare sharing

6. Thomas Jefferson National Accelerator Facility Some thoughts Strategy of fulfilling (most of) not-dedicated readout electronics needs for SOLID does not seem impossible by 1) sharing spares/electronics amongst Halls 2) pre-buying needed components Communication with Cornell on cryogenic needs and planning for CLEO magnet has started 2 nd SOLID Brainstorming session added 3 rd homework Sharing possible between Hall A cryo target, and foreseen Moller and SOLID targets? Director’s review timing likely when more info on magnet has arrived