Activities of FNPL from 02/28 - 03/04
                        Friday Mar 4 th, 2005


     
      minutes at: http://nicadd.niu.edu/fnpl/Operation/Minutes/



* Plan for next week:

	Monday: - north cave run [Ray]
                 - fix problem with steerer [Jamie]
                 - work on 200 kW klystron (south cave should be interlocked) [John, Tim]
                 - do some test on cryo [Brian]

	Tuesday:- more work on klystron ?
                 - realign/recalibrate OTR for flat beam experiment [Philippe]
                 - work on O-scope [Jamie]

	Wednesday: 
                 - 5-beamlet experiments [Philippe, Jianliang, Rodion]

	Thursday:          
                 - flat beam [Philippe]

	Friday: 
                 - AM north cave [Ray]
                 - PM flat beam 

* Last week activities:
- Monday: north cave ran. Work on the laser was performed by Jianliang 
  replaced the last UV lens of the telescope by a shorter focal length 
  to be able to control the beam spot on the iris in the laser room
- Tuesday, the camera optics at X8 was improved (zoomed by a factor 2) 
  and a set of flat beam data were taken
- Wednesday/Thursday: the optics to focuss the OTR from the plasma 
  chamber to the streak camera was commissionned: first results are 
  encouraging (can see the beam on the camera) but further 
  work is needed (chesk if we have a focussing). Note the streak camera 
  slit was open from 78 microns to 1000 microns. Thursday night the 
  9-cell klystron was unstable and could not deliver the proper 
  power anymore, this resulted in the impossibility to take data
- Friday: north cave was running, the 200 kW klystron was moved out 
  and was diagnosed: some contact on the klystron soket are damaged, 
  but the klystron filament looks OK

ACTION ITEM 
updated: Mon Feb 21 10:45:52 CST 2005

H8/ calibration of upstream directional coupler and
    insulator (Markus need to speak to Tim and with Kai to
    schedule this STATUS?)
H13/ Pulse stacker, what do we do? (Rodion)
H21/ the laser uniformity problem can this be due to the new (since
     late summer) tight focusing in the doubling crystal area to
     improve conversion efficiency? On going work [Rodion]
H33/ laser fluctuation since June 1st week [FIXED?]
H34/ Need more work on power supply + devise a way to measure
     the current being put out to the magnet [Jamie]
H36/ laser room/table vibration studies [Rodion] write up available [DONE}
H39/ streak camera new optics for plasma OTR and UV laser 
     streaking. [Jamie, Greg, Rodion, Philippe] UV works need to test OTR
H40/ installation of UIUC experiment, beamline design [Philippe] 
H41/ OTRI experiment [Greg]
H42/ revisit EO sampling experiment [Jianliang]
H43/ laser cooling system upgrade 
     [Jamie-> discuss with Adrian, Jianliang,Rodion Req written up -> Helen]
H44/ do we need to get our rf system out of the TeV LCW and Why [Jamie/Philippe]
H45/ O-scope floppy disk [Jamie]
H46/ dying gun klystron [Tim K.->John Reid]
#.46

from Adrian Melissinos:

NEEDED LASER STUDIES:

2. beam profile (wavefront) studies both in IR and UV
   in laser room and on virtual cathode. Use spatial filters
3. study of doubling and quadrupling efficencies with old
   and new crystal, take a tuning curve 

POSSIBLE LASER UPGRADE PROJECTS

1. Measure IR pulse length before compression (use diode?)
   implement cw autocorrelation
2. Install new beamline between multipass and 2-pass --
   install spatial filter, rebalance 2-pass amplifiers
4. _harware_: replacing all coolers with new system IV +
   use existing system III as back-up (see H43)
5. pulse stacker studies, new pulse stacker R&D (see H13)