Activities of FNPL from 02/21 - 02/25
                        Friday Feb 25 th, 2005


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



* Plan for next week (02/28 - 03/04):

	Monday:.north cave run
               .laser work [Jianliang. Rodion]
                    - put new UV lens in telescope (?)
	       .other: 
	            - repair floppy disk of the O-scop in control room
	            - steerer power supply of HVA9C trips when being degauss
		      [Jamie]

	Tuesday:.south cave run
		    - flat beam [Yin-e]
		      
	Wednesday, Thursday: plasma lens experiment 
	         [Matt, operator Jamie 9->4, Philippe 4->8, Rodion 8->end]
	          
        Friday: north cave run (?) [of not plasma experiment]


* Last week activities
- Monday and Tuesday, Jianliang and Rodion worked on the laser, trying to 
  optimize the grating settings to minimize the bunch length to about 3.5 ps. 
  This was not successful: the bunch length keeps being around 10 ps FWHM and 
  fluctuate from bunch-to-bunch
- Tuesday evenning we run the plasma experiment, beam + optics was setup 
  and later in the evenning we could observe plasma-based focusing   
- Wednesday and Friday more data on plasma focusing were taken. The e- 
  beam properties were measured: bunch length is about 10 ps rms (at 12 nC), 
  and emittance after the thin Al foil is about 50 mm-mrd. 

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)