1. Plans for Laser-wire System Grahame Blair 30th May 2005
Brief overview of UK LW programme
ATF Extraction line LW
Plans for this year
ATF2

2. University College London (UL)
Laser-wire People
BESSY
T. Kamps
DESY
H. C. Lewin, S. Schreiber, K. Wittenburg, K. Balewski
Oxford
R. Bingham, B. Foster, N. Delerue, D. Howell, A. Reichold
Royal Holloway (UL)
Agapov, G. Blair, G. Boorman, A. Bosco, J. Carter,
L. Deacon, F. Poirier, M. Price, C. Driouichi
University College London (UL)
S. Boogert, S. Malton
CCLRC Daresbury
L. Jenner
KEK
Aryshev, H. Hayano, P. Karataev, K. Kubo, N. Terunuma, J. Urakawa
Kyoto
N. Sasao
SLAC
A. Brachmann, J. Frisch, M. Ross
Project web page:

3. Progressing really well
Laserwire - PETRA
+ UCL
+ Oxford
RHUL
UCL
DESY
CERN
Progressing really well

4. PETRA laser-wire – 2d system
2-d scanning system
Mechanics designed + built at Oxford
Optics + electronics on order
Final construction at RHUL with UCL + Oxford
Will be shipped to DESY in summer 2005

5. Laser-wire Future Major new laser lab now set up at Oxford
Building international group in advanced lasers for
accelerators; mode-locked system planned.
Install micron laser wire in ATF extraction line
Build expertise in ultra-fast EO scanning
Improve PETRA LW performance
Plan move to PETRAIII location + new optics
Build ATF2 micron-scale laser-wire
Multiple IP systems
ATF2 proposal for LW
“Shintake” systems with Tokyo Uni./ KEK
(ATF2 proposal in preparation)

6. ATF Laser-wire Motivation
At ATF, we will aim to measure micron-scale electron spot-sizes
with green (532 nm) light.
Aim at intra-rain (fast) scan for 300ns bunch spacing.
The final spot-size measurable at ILC will have implications for
the length and layout of the BDS diagnostics section.
The ATF/ATF2 results will be crucial to determine the technical
boundaries.

7. pulsed laser-wire location

8. This year’s activity for the ATF extraction line laser-wire
March 2005: “study trip”: Understand the possible setup [optics/infrastructure], prepare our DAQ.
May 2005: Laser measurements, study the laser beam optics. Plan DAQ. Electron beam optics. Lens design.
September 2005: Install laser transport and beam delivery (Optics, Scanning, electronics), install vacuum vessel and build final focusing lens. First installation of DAQ.
November/December 2005: Laser-wire run.

9. + Axel + Marc + Pavel + Alex + KEK

10. Other issues
Multiple IPs: How many laser-wires will we need for ATF2 / ILC?
Synergy with “Shintake” system.
Laser transport: Multiple IPs – how do we distribute the laser light; fibers ? Local laser amplifiers ? Timing issues ?
Compton Detectors: How best to detect – electrons/photons (both?). Speed, resolution, location. Also EUROTeV input here.
Optics design of beam diagnostics region Still lots to do; intrinsic part of our programme.

11. Complementary Strategy
PETRA aims: Turn-key diagnostic,
reliability, speed, resolution. 2-d system.
Workhorse diagnostic for PETRA III and
foundation for ILC.
Will use identical DAQ for ATF.
ATF2 aims: Micron spot-sizes in ILC-like
conditions. Critical LW specs for CDR.
Both: excellent training ground for the people
who will actually build the ILC

12. Summary PETRA and ATF/ATF2 complementary laser-wire systems
Strong international team growing around ATF
Major new laser project about to grow in UK.
Very successful visit to KEK
Look forward to mini-workshop in London in June
Thankyou to our hosts at KEK for their hospitality,
help and support.