Next Meeting

Date: March 18, 1997

Time: 3:00 - 4:00

Place: Test Lab Conference Room

Attendees

• None Items of Discussion
  ----------------------
  

• Kevin and Lia presented plans concerning the FEL "AMS". Kevin gave a brief outline of the system architecture. He described a set of VME switch modules (HP; used for video switching in the ITS presently) linked as a MUX with 12 fiber lines to carry the signals to the MCC. The analog to fiber converters are an "off-the-shelf" commercial design. The system allows 96 inputs to 12 outputs in the MCC with each of the 96 inputs going through a buffer and into an A/D convertor defined in EPICS.

• This would be a vast improvement over the existing AMS allowing virtually any signal in the machine to be stripcharted/archived for cross-correlation or off- line analysis. However care must be taken because these switch modules have no readback, a principle flaw in the existing AMS. They are a commercial card in a commercial card cage using the existing Epics communication links, so this should be nowhere near as great a problem.

• Lia talked about using 60 of the 96 signals for the rf system. In addition to the standard GSET, GMES, PSET and PMES, she would like the CFQEx signals out of the control modules. These signals are directly related to the off- crest phase of the cavities and should allow testing of stability issues.

• It was decided that, rather than degenerate into design details for the system, Kevin would schedule a design review after the Eng. Change for the system was approved.

• Dave Douglas talked about the procedure to rematch the beam into the wiggler. This procedure is available on his www page. It was overshadowed by his comment that to do the CSR emittance tests we need to move the OTRs in the backleg. This caused Kevin to worry about changes to requirements after the hardware was designed. Dave agreed to get the correct posistions for the OTRs to Kevin/mechanical design as soon as possible. The other issue that came up was resolution vs. field of view on the cameras used for the OTR's will require zoom lenses to have sufficient sensitivity to make the measurement. Dave also agreed to talk to Jinhu about the ssytem to get details. George Neil said Kevin should plan for three motorized zoom lenses. -more changes in existing designs -

  New Issues
  ----------
  

• We need to revisit Byung on injector parameter issues.
• What is final aperture configuration for the injector drive laser? Modeling is for 3 mm aperture with 2 sigma spot and it was agreed that this would be what was run for the next series of runs at 350 keV.

  Action Items
  ------------
  

• Dave Douglas to talk to Jinhu about camera system.
• Dave also to get OTR placement in backleg finalized.
• Kevin to get engineering change in place for AMS system.

  	
  Action Priority  Items (assigned)
  
  ----------------------------------
  
  
  A-05   2  Injector energy precision                     Douglas
  A-15   1  Commissioning Procedure                       Legg, Krafft    5/16/96
  A-19   0  Web Documentation                                             weekly
  A-20   1  10->42 MeV dump                               Douglas
  A-24  1,2 Beam loss                                     Bohn
  A-29   1  Software Planning for Longer Term             Bohn, et al.
  A-30   1  Burnthrough/Conflat Expansion                 Denard, Kloppel
  A-34   2  Consistent Linac phasing plan                 Yunn
  A-35   1  simultaneous transverse and longitudinal      Kehne/Engwall	8/6/96 
  A-39   1  report on ARR plan 				Legg		8/23.
  A-42   2  2nd gun for long term tests			Bohn		10/1/96
  A-44  1,2 Start Rui on emittance code                   Bohn            8/13/96
  A-47   1  OTR beam interaction number by 		Denard		9/11
  A-54   1  FEL Turn-On Proc				S. Benson	11/1/96
  A-55   1  Laser Diagnostic Proc				Benson		11/1/96
  
  Action Items (pending)
  ------------
  
  P-02  1   Laser phase modulator						Jordan
  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-14  1   How is the gun/laser operated?				Benson
  P-15      Discussion on robustness of controls				Legg
  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
  P-30  2   Tracking including realistic wiggler fields			Douglas
  P-37  1   42 MeV dump design and interlocking				Wiseman
  
  Agenda for Next Meeting
  -----------------------
  
                  Item                              Person Responsible     Time
                  ----                              ------------------     ----
      *	Review agenda/corrections to minutes	        Legg	         5 min.
      *	ARR issue review				Boyce		 20 min
      *   Close out action items				all		 10 min
      *   New Issues 					ALL    		 10 min
      *	Agenda for next meeting		                All		 5 min.