Condensed list of TASKS FOR EG2000
 
 

Target
 

1. Improve safety against vacuum "event". Increase magnet insulation, remove flow restrictions. New barriers, safety documents, active and passive warnings etc.
2. Decrease operating temperature of cryostat ("banjo") from 1.2 K to less than 1 K. Reduce He consumption/flow and therefore icing.
3. Improve reliability and ease of operation. Examples: Batch filling, better stepper motors, redesigned target stick, more probes. Hunt for and eliminate noise sources. Revamped µwave system, NMR system.
4. Other issues: Software improvements and changeover to EPICS. New irradiated material. New survey. Full tests planned for May before installation in August 2000. Update documentation.

Beamline

Minimize obstructions. Re-survey narrow beam line elements? Align BPM and target carefully to beam line. Need reliable survey marks on target (radiograph?) Auxiliary steerers? Study beam transport.
 

Møller Polarimeter

1. Protect pol. target and CLAS detectors during Møller run (shielding of CLAS against spray). Max. luminosity?
2. Optimize/simplify interface (GUI), get reliable normalization (beam monitor scintillators?), fast online reporting, handle 30 Hz/indirect helicity reporting (???).
3. MC simulation/final analyzing power corrections.

Raster

1. Increase cooling (larger aperture hoses, copper cooling lines) for magnet power supplies, get clean chiller with higher cooling power. Reliable operation (overraster) at 6 GeV! Need spares?
2. BCS: Get finer control for raster size and position. Clean up interface (more reliable, feedback, GUI more logical). No more "zero on change". Need to be able to change one parameter without resetting others.

BPMs

We need the 2 before the raster for orbit lock. Last one needs to be fast for normalization and position readout. First one needs to be fast, too, for Møller normalization. Requires changes in electronics and/or software (coordinate with Chip Piller, Acc. Group, others…). Actual performance (limits) must be tested.
 

Reliable, fast normalization

Fast Faraday cup integrator -> need at least 1kHz/nA. Module exists, but must be installed and tested. Faraday Cup time constant must be determined.

Fast BPM (see above)

Additional luminosity monitors? Suggested: Cerenkov integrator in beam line.

Fast charge asymmetry readback and feedback to injector via EPICS.
 

DAQ

Fast readout of BPM and raster magnet analog signals

Helicity scheme: SLOW raster, FAST helicity change

Readout of 300 scaler events every 10 s. Need to include helicity-correlated deadtime.

Settling "blank-off" (gates for scalers and trigger!)? Direct reporting!

Trigger studies

Special calibration requirements?

Online Monitoring (asymmetries, other diagnostics). Need GUIs

Fast offline monitoring (can we produce HelP tables right away)?