Free Electron Laser Commissioning/Diagnostic Meeting
Tuesday, July 8, 1997
Recorder: R. Legg
Next Meeting
- Date: July 15, 1997
- Time: 3:00 - 4:00
- Place: Bldg 89, Large Conference Room
Attendees
J. Bennett, R. Legg, C.L. Bohn, G.A. Krafft, K Jordan
G. Neil, D. Kehne, G. Biallas, J. Boyce, P. Piot
D. Douglas, Q.S. Shu, R. Walker, L. Merminga
Addenda/Errata to Previous Minutes
Items of Discussion
-----------------
- Dave Kehne presented some of the longitudinal emittance data for
135 pC/bunch taken during the last ITS run. The slides can be
viewed on the www at:
www.cebaf.gov/~kehne/its_results
- It is noteworthy for how closely the energy spread vs. longitudinal
position data matches the PARMELA simulation.
Several issues remain, the transverse sigma of the beam at the
aperture appears to be much larger than predicted by PARMELA and
the beam forms tails at the edge of the bunch. We will try to set
up a Thursday talk for Dave to present his results prior
to going to the FEL conference next month.
New Issues
----------
- George Neil pointed out that we still do not have a complete Meta-
Procedure for Energy recovery on the FEL and we are missing many
of the detailed procedures for the First Light run. He sited:
- detuning curves
- sensitivity curves for the laser vs. beam properties
- efficiency vs. output coupling
- spotter charts for proper beam setup
- dump setups
- operation at harmonics
etc...
- To summarize, we need to get on the ball towards writing the
procedures needed to operate the FEL.
- The multislit desired for the injector will be put on hold until
we can reasonably bring it through the design, fab, and install
process without stalling other high priority projects already
in the pipeline. Geoff will contact E. Feldl and discuss when
it will fit in his schedule and give a five minute report next week.
Action Items
------------
*
Action Priority Items (assigned)
------------------------------
A-15 1 Commissioning Procedure Legg, Krafft 7/16/97
A-19 0 Web Documentation weekly
A-24 1,2 Beam loss Bohn
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 Krafft/Kehne
P-08 1,2 How do we change energy? What is the energy range? Benson
P-19 2 Consistent linac/bunching phase sets Yunn
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 agenda/corrections to minutes Legg 5 min.
* Commissioning Meta-plan Douglas/Legg 30 min
* New issues all 10 min
* Agenda for next meeting All 5 min.