Free Electron Laser Commissioning Meeting
Friday, 23 Jan 98
Recorder: C. Bohn
Next Meeting
- Date: 30 Jan 98
- Time: 0830-0930
- Place: FEL Facility Break Room
Agenda for Next Meeting
Item Person Responsible Time
---- ------------------ --------
Status of Open Action Items All 5 min
Progress Report on Commissioning Preparations Bohn/All 20 min
Overview of MPS/BLM Checkout Procedures Jordan 10 min
Progress with CSR Simulations Li 15 min
New Issues All 5 min
Agenda for next week All 5 min
This Week's Attendees
J. Bennett, G. Biallas, J. Bisognano, C. Bohn, D. Douglas, J. Fugitt, A.
Hofler, K. Jordan, G. Krafft, R. Legg, L. Merminga, W. Oren, P. Piot, J.
Preble, Q.-S. Shu, R. Walker
Closed Action Items
- Merminga: Meet with L. Doolittle to decipher whether we need PTUNE.
Lia reported on planned modifications of rf software. TUNE22 needs to be
modified to incorporate the magnetostrictive tuners and drive them based on
a current-dependent set point. Lia needs to resolve how to obtain current
readings for this purpose during operations (see new action below).
Likewise, PTUNE needs modification to incorporate the tuners. Lia and her
colleagues will try to get these mods in place prior to first-light
commissioning. Some discussion also ensued on how to put off-crest cavity
operations into CREST. Lia closed by highlighting ongoing CEBAF efforts to
simplify screens that indicate rf and srf status, and the intent is to load
the updated software into the FEL system as it becomes available.
- Bohn: Decide when formally to implement the position of FEL Experiment
Coordinator. Strictly speaking, the FEL EC is not needed until we begin
operating from the MCC. However, to identify and mitigate difficulties
that might arise with the position, we will have an FEL EC as soon as we
begin operating again (nominally 2 Feb 98). J. Fugitt offered his
services, so he will be first up. He (and Bohn) will be carrying a
cellular phone.
- Bohn: Inform D. Windmueller about FEL SWIS requirements. R. Walker is
working this. He met with Windmueller, and they have already developed a
draft FEL SWIS screen. Walker will see the effort through to completion.
Items of Discussion
Resumption of FEL commissioning is planned to begin 2 Feb 98, although
this date could slip a few days depending on CHL availability. Please
remain calm.
We reviewed progress on the remaining key tasks that need to be
accomplished prior to resuming commissioning:
- Task: Prepare for Commissioning from MCC (Bohn)
Status: Hardware for the MCC (two workstations and a video system) is
still projected to be installed prior to resumption of FEL operation. The
video system is already installed but needs cables. R. Legg conducted a
tour and tutorial of the FEL machine for CEBAF operators that was filmed.
Bohn needs to coordinate the FEL shift-staffing plan with R. Lauze to fold
in CEBAF operators.
- Task: Complete MPS for First Light (Jordan)
Status: Remaining is the need to interface the defocusing quads and
raster magnets and finish instrumenting the dumps. A meeting was held on
22 Jan 98 with the principals to ascertain required settings, and
appropriate follow-up will take place. Jordan estimates that the MPS
necessary to run 1.1 mA cw in the injection line to the 0G dump will be in
place by 10 Feb 98, and that needed to run 1.1 mA cw to the straight-ahead
(2G) dump will be in place by mid-February, both commensurate with the
commissioning schedule.
- Task: Complete First-Light Magnet Field Maps (Biallas)
Status: Done for QBs; incomplete for QGs, but in progress.
- Task: Finish and Install Bunch-Length Monitors (Jordan)
Status: Uwe Happek's student, Michael James, is now slated to come
here in mid-February to install the injection-line device and do checkout.
The second monitor, to be located prior to the wiggler, will be installed
in mid-March.
G. Krafft mentioned that a current-monitor (and M_55) cavity has been
installed on the injection line prior to the X-chamber, and cabling is in
place. This will be a nice, independent, calibrated diagnostic for current
measurements.
There was considerable discussion on scheduling. Bohn invited
everyone to e-mail R. Walker, with copy to Bohn, in cases where there are
personal preferences or constraints that need to be considered. Bohn also
reminded everyone that the strategy continues to be always to have a solid
two-week plan that will be documented on the white board in the FEL break
room, as well as a three-month projection. We will work out the details
as we go and will try to be accommodating insofar as is possible.
R. Legg advised that he completed the Procedure for CW Setup for First
Light and all that remains is to post it on the Web.
C. Bohn relayed a memo from J. Boyce saying that the DOE site
office and the Accelerator Division have agreed that the FEL Accelerator
Readiness Review will need to be held in early May prior to conduct of user
experiments. This means all WBS managers and other affected parties will
need to begin doing the ARR assessment soon. Boyce will set up a refresher
workshop, which all present agreed should ideally be in late February
(post-GEN) or perhaps March.
New Issues
None.
New Action Items
- Merminga: Resolve how to obtain current readings and feed it into rf
software for cavity tuning. (due 30 Jan 98)
- Walker: Amend OSP to enable FEL operations prior to 5 Feb 98 (the
projected date for resumption of MCC operations). (due 27 Jan 98)
Old Action Items
- Bohn: Meet with S. Suhring to discuss procedures for CATER follow-ups.
Status: Bohn and Walker collected some information from B. Madre
concerning CATER summaries, and Biallas offered to assist with CATER
follow-ups. However, Bohn still needs to sit down with Suhring. (due 30
Jan 98)
- Bohn/Walker: Review and distribute 3-month shift schedule. Status: A
draft schedule was distributed with the intent of soliciting individual
preferences. It still needs to be finalized and coordinated with R. Lauze
as concerns use of CEBAF operators. (due 30 Jan 98)
- Biallas: Install the generic field maps for the QB and QG quads, and
recheck to ensure all magnet field maps necessary for first-light operation
are accessible from the control room. Status: Done for QBs, but not for
QGs. Biallas is working this with S. Higgins and will see it through to
closure. (due 30 Jan 98)
- Legg : Develop strategy for optimizing electron beam quality. Status:
Closeout awaits B. Yunn's return from Korea, the exact date of which is
uncertain.
Procedures in Work
Emittance Growth from CSR
- Tomographic Phase-Space Map Piot, 15 May 98
- Back Leg Thread Douglas, 30 Jan 98
Thread Beam around Machine, Top-Level Douglas, finalize 30 Jan 98
RF Stability during Energy Recovery Merminga, 30 Jan 98
MPS/BLM Checkout for First Light Jordan, 30 Jan 98