Free Electron Laser Commissioning Meeting

Thursday, 17 Jul 98
Recorder: G. Neil

NOTE: C. Bohn will be on vacation from 14-24 Jul 98; D. Gilchrist will have phone numbers by which he can be reached during that time. J. Fugitt is on vacation from 8-19 Jul 98.

Next Meeting


Date: 24 Jul 98 (G. Neil officiating)
Time: "0845"-0945
Place: FEL Facility Break Room

Agenda for Next Meeting


Item Person Responsible Time ---- ------------------ -------- Status of Open Action Items All 5 min Commissioning Schedule Neil 10 min Status of Lasing or Gun Activities Neil 5 min Overview of Injector Setup Procedure Biallas 20 min New Issues All 5 min

This Week's Attendees


J. Bennett, S. Benson, J. Bisognano, J. Boyce, F. Dylla, A. Grippo, L. Harwood, K. Jordan, R. Li, L. Merminga, G. Neil, P. Piot, M. Shinn, M.Spata, B. Yunn

Closed Action Items


None.

Items of Discussion


We discussed the hardware and software tasks to achieve 1 kW Lasing. Although there has been significant progress on the list most tasks remain only paritally complete. Efforts need to focus on the must-have actions for the 1 kW lasing.

Hardware progress toward getting the beam recirculated is farther along. Significant installation activity during the last week has moved us closer to completion of the systems. Most systems are in place and believed to be operational. That is, we will find out next week during beam operations what remains on the punch list. All system owners are to perform a hot check of their system before signing it off by next Thursday.

A 5F BPM is unavailable due to our failure to fix the vacuum leaks on the feedthroughs. A second try is underway but if that fails we will remove IPM4F09 on Monday and install it in the 5F region so we have at least minimal diagnostics there. MPS checkout will proceed next Tuesday so that we have permissives for recirculation when we come up on Thursday. Initial plans will be to lase at 5 microns using the high power 10% outcoupler mirrors. (The downstream mirror was checked today for stability of alignment and was found to have a loose screw which was fixed.)

A schedule has been produced for the next two weeks which has us doing that lasing, doing initial recirculation, and providing light for the first user demonstration in Lab1.

We went over in detail the remaining "Subsidiary Tasks for Phase-Space Metaprocedure", and the revised list appears at the end of these minutes.

J. Boyce presented the eight remaining open actions from the ARR which must be accomplished before routine operation of the user facility can proceed. All actions got assigned and only one appeared to have significant impact: closing the shutter to the user lab when the machine is off for extended periods. K. Jordan is looking at the PLC implications of that requirement and the best method to incorporate the change.

New Issues


None.

New Action Items


None.

Old Action Items


Procedures in Work



Procedures Needed for Recirculation



Unfinished Subsidiary Tasks for Phase Space Metaprocedure


Task                                                           Principal
----                                                           ---------
I.      Stabilize Drifts in Drive-Laser RF Phase               Walker/Fugitt

II.     Calibrate RF Gradients
        A.      Buncher                                        Yunn    
        B.      Cryounit Cavities (fix control screen)         Merminga/Krafft/Yunn
        C.      Cryomodule Cavities                            Merminga/Krafft/Yunn

III.    Reconcile Methods for Setting RF Phase                 Merminga/Krafft/Yunn
        A.      Buncher Cavities
                2.      Minimum bunch length/time of flight
                
        B.      Cryounit Cavities
                1.      Transient phasing
                2.      Cresting
                3.      Time of flight

IX.     Complete Diagnostics Procedures and Training            Krafft/Piot
        A.      M_55 #1, #2
        B.      Happek #1, #2
        C.      BPMs
                1.      button calibration factors 
                2.      rotated MEDM spike charts
                3.      difference orbit data acquisition script
        D.      Multislit #1, #2
        E.      Quad/Viewer (at Wiggler, after Wiggler)
        F.      Multimonitor (at Wiggler)
        G.      SLM/CSR
        H.      Zero Phasing
        I.      Momentum Spread (Injector, Linac Pre-Wiggler, Linac Post-Wiggler)
        J.      Energy

XIV.    Update (as appropriate) "First Light" Procedure         Benson