Next Meeting

Date: 27 Mar 98

Time: "0845"-0945

Place: FEL Facility Break Room

Agenda for Next Meeting

                Item                             Person Responsible     Time
                ----                             ------------------  --------
Status of Open Action Items                             All             5 min
Scheduling and Commissioning Program                    Fugitt/All     25 min
CSR Simulations                                         Li             15 min
New Issues                                              All             5 min
Agenda for next week                                    All             5 min

This Week's Attendees

S. Benson, J. Bisognano, C. Bohn, J. Boyce, S. Buettmann (Phy Div), R. Campisi, D. Douglas, J. Fugitt, A. Hofler, K. Jordan, G. Krafft, R. Lauze, R. Legg, R. Li, L. Merminga, J. Mitchell (Phy Div), G. Neil, D. Oepts, J. Parkinson, P. Piot, M. Shinn, Q.-S. Shu, T. Siggins, R. Walker, B. Yunn, 3 other Phy Div members

Closed Action Items

• Douglas: Update spreadsheet code to reflect "song-sheet" nomenclature. Status: Complete.
• Bohn: Test www logbook and shift-summary entries via a trial shift log. Status: It appears that FLOG entries are not automatically transcribed in the shift log. We likewise noted this during the week's commissioning activities. A. Hofler has been apprised.
• Fugitt/Physics: Resolve how to verify spot size on the GEN targets. Status: As of this morning, the plan is to install a ceramic viewer with a hole along with a monitoring camera. The ceramic will tolerate up to 80 ľA current.
• Bohn: Check with Parkinson about reactivating the NEG in the energy-recovery dump line. Status: The NEG pump did not need to be reactivated.
• Boyce: Resolve with Physics Division people the time needed to irradiate each GEN target, and arrange for one of them to give an overview of the irradiation procedure at next week's meeting. Status: Warm targets will require 8-10 hours of 2 ľA irradiation, and cold targets will require 5-6 hours of 2 ľA irradiation. M. Seely gave the overview this morning.
• FEL WBS Managers/Integrators: Attempt log-on to www-based ARR system. Status: J. Boyce contacted the affected individuals so they know who they are. C. Bohn attempted log-on and worked with Boyce through a few bugs in the process.
• Douglas: Update spreadsheet code to propagate zero-current beam to the straight-ahead dump given the 60 pC PARMELA settings. Status: Complete and running on a workstation in the FEL Control Room.

Items of Discussion

With this week's successful commissioning of the injector and linac with cw electron beam up to about 8 ľA, we are ready to begin GEN target irradiation and will start ASAP this afternoon. M. Seely led a discussion of the associated procedure and technical details. Some highlights are:

• The FEL operator, not the Physics Division participant, will have final say in the respective shift activities. We all expect collegial communications, but the attendees felt it important to establish unambiguously the "crew chief".
• Per Physics Division request a couple of weeks ago, GEN target irradiation will be controlled from the FEL Control Room rather than the MCC due to the use of some specialized diagnostic equipment and cabling for the equipment.
• Warm target will require 8-10 hours of 2 ľA irradiation, and cold targets will require 5-6 hours of 2 ľA irradiation.
• A ceramic viewer with a hole, along with a monitoring camera, will be installed to monitor beam position on the target. CTR may be sufficient to look at the whole beam profile (we'll see tonight). The ceramic will tolerate up to 80 ľA current.
• Target irradiation does not require precise delivery of dosage. A factor-of-two measurement of electron-beam current is more than sufficient. We will therefore use the BCM cavity on the linac as the principal current monitor. It was tested this week with beam and "calibrated" against the picoammeters on the straight-ahead dump.
• The cold dewar will be located at the downstairs elevator foyer until it is needed in the beamline. The dewar needs to be topped off about every 8 hours. When the dewar is moved into the vault, we will not have both access doors closed with the dewar and a person inside (for ODH safety). Rather, one door will remain open in the process, which is eminently doable since at least two people will be involved.
• An approximately uniform beam (at the 10% level) is needed across the target. We will therefore leave the raster magnet on during irradiation, per our original plan.
• Everyone is looking forward to the upcoming activity. The discussion was very good.

New Issues

This is not really a new issue, but it was emphasized today that we need to work out how and when to transition to the MCC for FEL commissioning. Following GEN, the program is to proceed with injector setup for first-light beam, then linac setup for first-light beam. A general question arose as to which diagnostics can presently be implemented from the MCC and which cannot. We will be working through this question in the immediate future. Plans are to transition to the MCC as soon as possible. R. Lauze indicated that there are six new operator postings, and so operator availability for the FEL is likely to improve gradually.

New Action Items

• Hofler: Recheck software link between FLOG and FEL shift summaries. (due 25 Mar 98)

Old Action Items

• Douglas/Karn: Ready the oval first-light air core correctors for installation. Status: Karn is planning to begin magnet measurements next week. (due 26 Mar 98 -- with some flexibility)
• Li: Explore implications of 60 pC settings for CSR experiments. Status: Li now has some preliminary simulation results around the first recirculation arc. She will continue and give an update at next week's meeting. (due 27 Mar 98)
• Yunn/Jordan: Prepare, label, and post to the "FEL operator page" viewer images of PARMELA beam for the optimized 60 pC setup. Status: Viewer images for the injection line and injector dump line are posted. Yunn and Douglas are working together on linac viewer images. There are hard copies in the FEL Control Room, but to date not all viewer images are posted on the operator page. (due 27 Mar 98)
• Jordan: Prepare procedure "MPS/BLM Checkout for First Light". Status: Was awaiting completion of the MPS. There is still some uncertainty in the MPS configuration/implementation that will be worked out next week, though at present the MPS is running and will support first- light electron beam. Jordan will get to work on the procedure. (due 27 Mar 98)
• Yunn/Jordan: Prepare, label, and post to the "FEL operator page" viewer images of zero-current PARMELA beam given the optimized 60 pC setup. Status: Hard-copies of the viewer images for the injection line and injector dump line are in the FEL Control Room, and D. Douglas's spreadsheet plots linac viewer images. They still need posting on the operator page. (due 27 Mar 98)

Procedures in Work

Emittance Growth from CSR

Tomographic Phase-Space Map                 Piot, 15 May 98
Back Leg Thread                             Douglas, 6 Mar 98

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

(Note:  The highest-priority item here is the procedure for MPS/BLM
Checkout for First Light!)