Minutes of A0 photoinjector (local) meeting
		        Friday Jan 16th, 2004


* Next meeting: Friday January 23rd 4pm in "the Motel"

* attendees: Rodion, Marcus, Nick, Kai, Daniel, Matt and Philippe 

* Plan for next week: 

-Monday:  Laser studies + impact on e- beam. (Rodion + Philippe)
-Tuesday: Morning: cave open
   	  Afternoon: dedicated to plasma (Matt et al.+ Nick)
-Wednesday: North cave will run. We may run in the morning 
          the gun (Philippe). 
	  In the afternoon we may be able to run the 9-cell (Kai?) 
	  and support Daniel work on the interferometer 
-Thursday: Plasma (Matt et al., + Nick)
-Friday:   Depending on Plasma experiment progress, Plasma 
	  otherwise longitudinal beam dynamics studies (Daniel + 
	  Philippe) 

Discussions:
* Rodion presented his impression on the ATF photocathode 
	drive laser at BNL.

* Achievements of last week:

- Monday, Tuesday: 
	-  installation of the Plasma experiment (Matt, et al.).
- Wednesday: beam through the machine: (Kai)
- Thursday and Friday: 
      - longitudinal beam dynamics studies (Daniel/Philippe), 
        no great progress we had problem in recovering the CTR signal 
	from the Michelson interferometer. The device was found to be 
	broken, a mirror had felt from its support the problem was 
	fixed and we could see a signal (interferomgram Friday). 
	However due to network (?) problem with the GPIB device 
	we could not take a good set of data...
      - laser studies (Rodion/Nick): streaked the laser pulse 
        time profile looks alright but quite long ~15 ps FWHM 
      - beam studies (Philippe/Rodion): the electron beam still 
        display a strong asymmetry in x-y that appears as beam skewness 
	or multi-spot depending on which OTR viewers the e- beam is 
	observed. This problem has been existing since late summer and 
	prevent us from doing real progress. It appeared to few of us 
	(after some discussion) this might be related to a change in 
	optics that occured in September or October in the doubling 
	crystal area of the laser: at that time it was decided to focus 
	the laser tighly to increase the conversion efficency there were 
	questions about potential phase mis-matching and operation 
	of crystal close to saturation. We need to check whether returning 
	to the initial configuration however will provide a better (=more 
	uniform) beam and to what price in term of beam charge. 
	

        -----------------------------------------

* Tasks concerning hardware (I updated the list today since we 
did not meet for almost a month: you will noticed many item have 
been resolved!) 

H2/ Corrector HTBX06, Jamie
     Matt asked a Steerer at UCLA it will be sent this tuesday 
H8/ calibration of upstream directional coupler and 
    insulator (Markus need to speak to Tim and with Kai to  
    schedule this STATUS?)
H11/ Some of the toroid need cabling to have signal available 
     out of the cave in the reack area
     (JAMIE, STATUS?)
H13/ Pulse stacker, what do we do? 
     (Rodion)
H14/ air coil steerers, Kai will gather all the paper he has 
     and we will decide whether we can give this project to one of 
     the NIU engineering student
     (Kai, STATUS: nobody at NIU picked up this project...)
H20/ what shall we do with the burnt doubling crystal? Who will 
     specify + order it? 
     (Nick, Rodion and Adrian should discuss next week)	<- NEW
H21/ the laser unifomity problem can this be due to the new (since 
     late summer) tight focusing in the doubling crystal area to 
     improve conversion efficency?    			<- NEW
     (All the laser gurues)
H22/ Radiation shielding test: precise plan on what to do and when
     (Kai + Lautenschlager)    				<- NEW