Next Meeting

Date: 10 Dec 98

Time: 1500-1600

Place: FEL Facility Break Room

Agenda for Next Meeting

                Item                             Person Responsible       Time
                ----                             ------------------    --------
Performance Summary of Recent FEL Cathodes           Fugitt/Siggins     30 min
Status/Quantification of Cathode Scans               Jordan             15 min
Status of Procedures                                 Bohn               10 min
New Issues                                           All                 5 min

This Week's Attendees

G. Biallas, C. Bohn, F. Dylla, J. Fugitt, G. Neil, L. Phillips, T. Siggins, C. Sinclair

Discussion

The purpose of this second meeting of the FEL Gun Committee was to check progress on the action items developed at the first meeting. Discussions are reflected and summarized in the compilation of action items below.

Closed Action Items

• Bohn: Meet with Sinclair, then Siggins, to list key processing steps that will serve as an outline of processing procedures.
  Status: Completed at this meeting. The result is a comprehensive list of elements of a "FEL Gun Refurbishment Metaprocedure", and it gives an indication of the work needed for comprehensive procedures:

  Cathode Preinstallation Preparation/Cleaning
  Cathode Changeout (have in draft)
  Vacuum Bake (have in draft)
  Cathode Heat Cleaning
  High-Voltage Processing (have in draft; needs significant enhancement)
  Making a Cathode (have Dunham's 1992 procedure as starting point)
  Establishing Voltage After Making Cathode
  Subsequent Reactivations (have Dunham's 1992 procedure as starting point)
  

New Action Items

• Biallas: Distribute documentation of B. Schneider's cathode temperature calculations to members of Gun Committee. (due 8 Dec 98)
• Siggins/Biallas: Specify design of experiment to measure cathode temperature. (due 17 Dec 98)
• Bohn: Distribute compilation of FEL gun FLOGs to members of Gun Committee. (due 8 Dec 98).
• Dylla: Inquire of M7 to determine their willingness to adopt a load-lock design effort as a formal Division task. (due 10 Dec 98)

Old Action Items

• Dylla: Ascertain feasibility of low-cost "load lock" for cathode-processing experiments in the ARC. Status: No progress. (due 10 Dec 98)
• Dylla: Work with contacts in academia to identify graduate-student candidates for ARC experiments on electrode materials and geometries. Status: No progress. (due 10 Dec 98)
• Fugitt: Follow through with Ling-Ling on having her develop a strawman table of HV experiments on candidate electrode materials. Status: No progress. (due 10 Dec 98)
• Fugitt: With Siggins and Phillips, begin filling out "wafer history charts", starting with the most recent wafers. Status: Siggins has handwritten summaries of the histories of the last two cathodes that he will present next meeting. The remaining histories still need compilation. Siggins compiled FLOGs related to the FEL gun and gave them to Bohn; Bohn will distribute it to the members of the Gun Committee per "New Action Items" above. (histories due to be completed by 17 Dec 98)
• Siggins: Begin scanning gun data and, with D. Gilchrist's help, compiling information into an electronic logbook. Status: No progress. (due 10 Dec 98)
• Biallas: Preposition resources for fleshing out designs of candidate load locks. Status: Accelerator Division has allotted only 0.25 manyears of designer time to the FEL for FY99, making it virtually impossible to complete a load-lock design. If we are to accomplish one, M7 will need to adopt it formally as a Division task. F. Dylla needs to inquire of M7 per "New Action Items" above. Biallas has notional designs already drawn up. G. Neil reported that a new funding source (Naval Surface Warfare Center in Dahlgren, VA) may be surfacing that would allot ~500 k$ for gun improvements -- a long shot, but he is following up with the lead. (due 10 Dec 98)
• Jordan: Quantify cathode scans, being careful to ensure the scanner intensity does not drive the physics into the Child-Langmuir regime. Status: Nearly complete; to be reported at next meeting.