Minutes of A0 photoinjector group meeting
                        Monday June 30th, 2004

           http://home.fnal.gov/~piot/FridayMeeting/Minutes/
           

* Next meeting: Friday July 2nd, 2004

* Plan for next week: 

- Monday:
       - north cave, cold gun running most part of the day
- Tuesday:
       - flat beam [Sun/Piot]
- Wednesday:
       - flat beam [Sun]
- Thursday:
       - flat beams (Lidia)
- Friday:
       - north cave, cold test of 3.9 GHz cavities
       
Discussions:

* Achievements of last week:

   Only two days of productive running last week: Yin-e reported on her 
   measurements: she took again beam spot measurement on the various 
   flags. However the data taking was spoiled by sudden change in the 
   gun phase (by sometime 100's of degree). There also was problems with 
   the FPN charging power supply (some interlock triggered time-to-time)


* Other discussed items:
   P. Piot (with help of Steve Lidia) gave a report on the Advanced 
   Accelerator Workshop that happened last week in Stony Brook. 

   P. Piot presented the opportunity to do laser acceleration 
   experiment with the upgraded FNPL photo-injector.

                   
* Tasks concerning hardware 
ACTION ITEM updated:
Mon Jun 14 19:11:40 CDT 2004

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)
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...)
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]                            
H25/ Software for the digital camera (Jason -- DONE); Now need 
     to choose which camera we are going to use [Jason/Markus] [DONE]
H26/ trigger problem on a couple of CCD camera 
     (->Kai will look into it 03/2004)
H27/ The temperature sensors on the laser components need to be 
     wired and archived on ACNET (Jamie 03/26/04) [DONE]
H28/ Problem with emittance measurement at X7 (Philippe 04/16/04)
H29/ Need daily monitoring of the laser parameters (Jamie/Rodion 04/23/04)
     [EVERYTHING NOW READY SYSTEM NEED TO BE COMMISSIONED]
H30/ Need monitoring of laser oscillator spectrum from HP spectrum 
     analyzer (Jamie 05/21/04) [DONE]
H31/ A/C problem in laser room [Since early May, NOT YET FIXED on JUN 14 !!!!]
     (Jamie) [AC FIXED ONE WEEK AGO]
H32/ Digital camera from SONY(?) need to be ordered
     (Jason) [ORDERED, ORDER STILL AT FNAL PROCUREMENT]
H33/ laser fluctuation since June 1st week


from Adrian Melissinos:

NEEDED LASER STUDIES:

1. Study of oscillator bandwidth versus length of 
   compressed pulse. Measure IT length using stepping 
   autocorrelator
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 
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