Next Meeting

Date: 13 Feb 98

Time: 0830-0930

Place: FEL Facility Break Room

Agenda for Next Meeting

                Item                             Person Responsible     Time
                ----                             ------------------  --------
Status of Open Action Items                             All            10 min
Progress Report on Commissioning                        Bohn/All       30 min
Scheduling                                              Bohn           10 min
New Issues                                              All             5 min
Agenda for next week                                    All             5 min

This Week's Attendees

J. Bennett, S. Benson, J. Bisognano, C. Bohn, D. Douglas, D. Engwall, A. Grippo, K. Jordan, R. Legg, R. Li, G. Neil, Q.-S. Shu, T. Siggins, R. Walker, B. Yunn

Closed Action Items

• Bohn/Walker:. Amend OSP to enable FEL operations without MCC staffing. Status: Closed. It was signed and released 4 Feb 98.
• Bohn/Dylla: Determine the disposition of the daily commissioning summaries that D. Engwall will be preparing. Status: Closed. Daily reports will be monitor and passed to Benesch at Dylla's discretion.
• Legg/Fugitt: Resolve whether gun HVPS modifications are needed to provide sufficient voltage preservation during operation with long (250 µs) pulses. Status: Closed. Legg has done PARMELA simulations indicating the voltage droop (250V) should have no discernible effect on beam dynamics.

Items of Discussion

R. Legg reported electron beam was passed through the cryounit and viewed to be a small round spot. The multi-slit diagnostic produced clear distinct stripes. He also reported the gun stalk was drooping causing an alignment problem with the first solenoid and the cathode wafer may be cocked causing field emission and arcing at 348 kV. The pros and cons of operating with the conditioning resistor were discussed. It was determined to fix these problems over the weekend. By working in parallel, additional time for SRF and RF tests is thus available. A revised schedule was made reflecting the tasks and times available for testing.

R. Legg reported the Quarter can be operated at 11 and 9 MV/m after the warm windows were changed and testing by SRF. B. Yunn agreed these were the values to use according to his simulations. The cryomodule cavity 4 runs only to 7 MV/m due to window temperature, but it is still being worked. The other cavities work well.

R. Walker reported a list of open caters has been given to C. Bohn, but that most of them are already solved and just need to be closed.

R. Walker noted the FEL enclosure is now a Radiologically Controlled Area, with access covered by a General RWP. All persons who may enter the FEL vault need to read and sign the RWP in the FEL control room. Remember to treat ALL beamline components as radioactive and to work with ALARA in mind when in the vault. A cabinet next to the lower level elevator doors, has been placed as a staging area for material coming from the vault. An ARM must survey stuff coming from the vault before putting it into the cabinet to make ensure that it does not cause an RCA at the cabinet.

New Issues

None.

New Action Items

None.

Old Action Items

• Bohn: Meet with S. Suhring to discuss procedures for CATER follow-ups. Status: Bohn still needs to meet with Suhring, who continued to be occupied all week with CEBAF duties. (due 10 Feb 98)
• Legg : Develop strategy for optimizing electron beam quality. Status: B. Yunn has returned and Legg has been discussing this issue with him. (due 11 Feb 98)
• Jordan: Provide an html template linking shift summaries and electronic logbook entries and making both easily accessible from www. Status: No progress. (due 11 Feb 98)

Procedures in Work

Emittance Growth from CSR

Tomographic Phase-Space Map                 Piot, 15 May 98
Back Leg Thread                             Douglas, 27 Feb 98

Thread Beam around Machine, Top-Level           Douglas, finalize 27 Feb 98
RF Stability during Energy Recovery             Merminga, 6 Feb 98
MPS/BLM Checkout for First Light                Jordan, 6 Feb 98