Next Meeting
Attendees
J. Bennett, C. Bohn, D. Douglas, F. Dylla, K. Jordan, G. Krafft, C. Leemann, R. Legg, R. Li, L. Merminga, G. Neil, P. Piot, J. Preble, B. Yunn
Addenda/Errata to Previous Minutes
Items of Discussion
In his new role as FEL Commissioning Coordinator, C. Bohn talked
about his prioritized tasks to take place from now until the August 1998 FEL
Conference to be held locally in Williamsburg. The tasks are:
MUST -- Priority 1: >100 W Light, First CSR Data, First User Experiment
SHOULD -- Priority 2: Lase with Energy Recovery
LIKE -- Priority 3: kW Light, Detailed CSR Study
Both F. Dylla and C. Leemann advised that these tasks and their respective priorities are consistent with the current state of overall Accelerator Division planning. In conjunction, C. Bohn announced his plan to hold a meeting on 24 Sep 97 to strategize how to phase commissioning and installation activities in the FEL Facility. The goal is to try to come up with viable groundrules for phasing the day-to-day, shift-to-shift commissioning and installation activities in the FEL Facility. This will contribute to determining detailed resource requirements for M7, as well as setting us up for commissioning the machine efficiently.
In his new role as FEL Injector Systems Manager, R. Legg distributed and discussed procedures and test plans for starting up the photocathode gun, rough setup of the injector, and setup of the 10 MeV injector dump. The procedures are available on the www at: http://www.cebaf.gov/~legg/procedures/Injector_setup_proc.pdf.
Questions about the final electron-beam energy from the injector and from the full linac were raised because these energies affect procedures for rf phasing and for setting up the electron-beam transport system. In particular, performance of the injection/extraction (DV) dipole magnets is sensitive to the cryounit performance. D. Douglas is considering how to maximize the variability of the beam-transport system for "5 mA, 42 MeV" performance in view of uncertainties in the ultimate linac performance. There is less, but not negligible, concern with "1.1 mA, 35 MeV" first-light beam. L. Merminga will be scheduled to talk about rf phasing issues in two weeks.
New Issues
Action Items
Action Priority Items (assigned)A-15 1 Commissioning Procedure Legg 7/16/97 A-19 0 Web Documentation weekly A-34 2 Consistent Linac phasing plan Yunn A-44 1,2 Start Rui, Jinhu? on emittance code Douglas 8/13/97 Action Items (pending)
P-05 1 Devise fine-tuning procedure for buncher gradient Legg P-08 1,2 How do we change energy? What is the energy range? Benson P-20 1 Lock plans (who in particular) Johannes? P-21 1 Save/restore plans Benesch P-25 1,2 RF control sensitivities/ Merminga Microphonics Diff for FEL/ Pathlength effect P-29 2 FEL/linac interaction Merminga Agenda for Next Meeting
Item Person Responsible Time ---- ------------------ ----- Review of Minutes/Errata All 5 min Commissioning/Installation Strategy Bohn 15 min Methodology for CSR Experiments Piot 20 min New Issues All 10 min Agenda for next week All 5 min