Activities of FNPL from 03/07 - 03/11
                        Friday Mar 25 th, 2005


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



* Plan for next week (03/28 - 04/01):

	Thursday: north cave running (SRF tests) 
	
	Other days are dedicated to round beam (Rodion) and longitudinal 
	dynamics studies (Rodion + Daniel)
		- establish beam and measure bunch length with CTR and 
		  streak camera 
		- get a two pulses bunch and test whether the structure 
		  can be detected by the CTR autocorrelation
		- take a set of round beam emittance at X3 (1 nC, scan 
		  solenoids, gun E-field to maximum possible)
		- measure spot size evolution along the beamline


* Last week activities
- Monday and Tuesday: 
      laser work: Jianliang and Rodion commissioned and aligned the pulse 
      stacker. They also tested a thinner BBO crystal to convert IR to green, 
      and measured a 32 % conversion efficiency (40 % improvement compared to 
      the present configuration with a 10 mm BBO)
      cold gun: Ray work on the cold gun he was able to operate the gun cold 
      at 30 MV/m with a rf pulsae of 140 musec maximum. Ray also measured the 
      Q of the cold gun and reported it is about 2.7 time higher than the
      measured Q when the gun is at room temperature. 
      
- Wednesday: Problem with RF 200 kW klystron (John Reid worked on it all the
      day)  
- Thursday/Friday: trying to resume beam operation, many problems/buggs (the 
      machine was off for 10 days), slow down our plans. By friday afternoon 
      Philippe and Daniel finally get beam up to the spectrometer.

* Discussion:
      - Philippe presented the layout of the  new user beamline. The beamline 
        SHOULD be installed in April and will support the fast kicker experiment
	by Gollin (UIUC) et al, the EO sampling experiment (NIU/Rochester) and 
	OTR interferometry experiment (FNAL)
      - Jamie reported the water system for the laser is now finished and was 
        being leak checked. 
      - John Reid ordered a new power supply for the 200 kW solenoids, one of 
        the present power supply keep trupping every two hours
      - shutdown: TimeBandwidth did not provide an exact date for the laser 
        delivery. During the shutdown the following item should be done:
	   - install laser and rearrange laser room, 
	   - install new user beamline (optical table in cave also)
	   - measure skew quadrupole
	   - update digital camera software
	   - gun klystron should be changed 
	   -...
	   
ACTION ITEM 
updated: Mon Mar 25 11:54:13 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, imaging system helped with 
      alignement of pulse stacker)
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]
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, design DONE] 
H41/ OTRI experiment [Greg]
H42/ revisit EO sampling experiment [Jianliang]
H43/ laser cooling system upgrade 
     [on-going work soon completed]
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]
H47/ dying 200 kW klystron [Tim K.->John Reid] Spare OK -> solenoid power supply
H48/ H/V steerer downstream of 9-cell need to be fixed HTV9A-C
H49/ skew quad measurements
H50/ LINAC-type steerers for user beamline
#.50

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)