4GLS OPEN FORUM MEETING
The next 4GLS Open Forum meeting will take place at 10.30am on Thursday the 18 th March in the Tower Seminar Room. Charles Monroe of Monroe Brothers will give a talk entitled, “Cryogenics for the ERL Prototype”.
If time permits this will be followed by a brief, visit summary by Jim Clarke. Jim recently travelled to LURE on a CLIO FEL fact-finding mission.
THE 4GLS INTERNATIONAL ADVISORY COMMITTEE MEETING
The fifth 4GLS IAC meeting will take place in the Tower Seminar Room on the 25 th and 26 th March. The meeting runs from 2.00pm on the 25 th to around 4.00pm on the 26 th. Staff may sit in on parts of the IAC meeting if they wish to but they must participate only as observers.
Please note that attendance at the 4GLS Open Forum and observing the 4GLS IAC meetings should be viewed as part of your learning and development and the time should be booked to your home departments not the 4GLS project. Please ensure line managers approve.
PHOTOINJECTOR LASER
The photoinjector laser was unpacked at RAL by Graeme Hirst, Marta Divall and Gary Markey on the 25 th of March. The laser worked well and comfortably met the specification straight from the box. The next step is to integrate the laser with a chopper and Pockels cell (amongst other bits) which are used to modify the laser output pulse structure so that it can deliver single pulses or 100 microsec pulse trains at 20 Hz. This task will take until August then the system will be transported to DL and re-commissioned in September.

"Gary Markey, Marta Divall and Graeme Hirst with the new photoinjector laser at RAL. The laser controllers, in the centre of the picture, dwarf the laser itself, which is the blue and silver box on the right hand side."
