Next Meeting

Date: September 30, 1997

Time: 3:00 - 4:00

Place: Bldg 89, Large Conference Room

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

A rough procedure is needed by 1 October 1997 for commissioning the full recirculating accelerator with low-current beam. D. Douglas is working a draft procedure.

Items of Discussion

F. Dylla and C. Leemann announced a reorganization of the FEL commissioning activities, distributed a memorandum to that effect, and discussed its content. For details, see the memorandum.

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

• See above.

Action Items

• Bohn: Set up FEL Commissioning/Installation Strategy Meeting (already done as of this writing).

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