Activities of FNPL from 01/16 - 01/21
                        Friday Jan 21 th, 2005


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



* Plan for next week:

   - Monday:
	- probably need laser work (see below) [Jianliang, Rodion]
	- measure the UV pulse length
   - Tuesday,Wednesday, Thursday: running beam
	- flat beam: 	- work on improving emittance ration
			- do a clean measurement of e+/-=e0+/-L
			- flat beam emittance vs B and sigma_c
	- round beam:	- emittance measurements, test mask
			- bunch length measurements  
   - Friday: No beam (gun only?); SRF test in north cave
    
* Last week activities:

- Monday and Tuesday: work in the cave occur on the plasma 
	chamber, beam was ran Tuesday afternoon for safety 
	approval [Gary]. 

- Wednesday: beam up to the plasma chamber in the afternoon, 
	start with Q=2-3 nC, after tuning the laser later in 
	the night Q=7-8 nC were produced (quoted charge are 
	at the gun), there are still a few problem regarding 
	beam transport up to the plasma chamber, generally 
	only 50% of the charge was transported to the experiment. 
	Need to do some simulations to understand what is the 
	problem (current thinking is the UV pulse length is 
	to short for this high charge and we might want to 
	have the pulse stacker in operation next time the 
	plasma experiment is scheduled to run). 
	The OTR imaging from the screen located in the plasma 
	chamber was tested, but due to high intensity plasma 
	flash light, the beam could not be seen when the plasma 
	source was turned on. We noticed the laser has many fellow 
	travelers

- Thursday: most of the day, Matt and Gregory worked on improving 
  	the shielding in the plasma chamber to reduce the level 
	of the plasma flash light, they build a small Al pipe in 
	the plasma chamber. In the afternoon, beam was again run to 
	the plasma chamber and the test of the OTR imaging was 
	successfull: the beam image is clear even when the plasma 
	is operating. 
	In the morning Jamie + Rodion finished aligning the UV laser 
	on the streak camera and conclusive testr were done in the 
	evenning however no data were saved.
	
- Friday: problem with cryogenic delay turn on to late morning
	 in parallel work on the laser was done to try to improve the 
	fellow traveler. In this process the laser energy dropped 
	by a factor 2 probably due to misalignments.  



	
	
ACTION ITEM updated:
date

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]
H32/ Digital camera from SONY(?): [Philippe/Yin-e]
     to be TESTED with OTR [Sep 27] [FIXED, we have prototype]
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]
H39/ streak camera new optics for plasma OTR and UV laser 
     streaking. [Jamie, Greg, Rodion, Philippe]
H40/ installation of UIUC experiment, beamline design [Philippe] 
H41/ OTRI experiment [Greg]
H42/ revisit EO sampling experiment [Jianliang]
H43/ laser cooling system upgrade [Jamie]
#.43

from Adrian Melissinos:

NEEDED LASER STUDIES:

1. Study of oscillator bandwidth versus length of
   compressed pulse. Measure IR length using stepping
   autocorrelator [Done week of AUG 23rfd 2004]
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
3. Relay imaging UV from laser room to cave[Done]
4. _harware_: replacing all coolers with new system IV +
   use existing system III as back-up
5. pulse stacker studies, new pulse stacker R&D