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Laser-wire at the ATF extraction line: Progress report

This report provides an update on the progress of laser wire activities at the ATF extraction line, including collaboration with UK institutes, the laser wire principle, progress made, and future plans.

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Laser-wire at the ATF extraction line: Progress report

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  1. Laser-wire at the ATF extraction line:Progress report • UK collaborators • Laser-wire principle • Progress on the ATF laser-wire • Future plans Nicolas Delerue, University of Oxford for the Laser Based Beam Diagnostic collaboration 1/8

  2. People and institutes involvedin laser-wire activities in the UK • University of Oxford:Nicolas Delerue, Brian Foster, David Howell, Armin Reichold • Royal Holloway University London:Ilya Agapov, Grahame Blair, Gary Boorman, John Carter, Chafik Driouichi, Michael Price, Thorsten Kamps (now at BESY) • University College London:Stewart Boogert, Steve Malton We acknowledge great help from DESY, KEK and SLAC. 2/8

  3. How does a laser-wire work? • A laser-wire uses a high power laser to shoot short laser pulses on a particle beam. • A movable mirror is used to "scan" the beam:each laser pulse is deflected by the mirror with a different angle. • When the pulse hits a bunch of electrons, Compton photons are produced. • A calorimeter is installed downstream after a bend in the electrons trajectory. • This distribution of the energy gives the beam profile. • From the beam profile, it is possible to exctract the size of the electron beam. Laser wavelength: 532 nm (Nd:YAG) Laser power: 1MW@PETRA 1GW@ATF 3/8

  4. This year’s plans for the ATF extraction line laser-wire • March 2005:“study trip”: Understand the possible setup [optics/infrastructure], prepare our DAQ, study the laser,… • May/June 2005:Laser measurements, study the beam optics, validate the DAQ • Summer/September 2005:Install the laser transport and delivery (Optics, Scanning,…), install our vacuum vessel at the ATF and final focusing lens • November/December 2005:Laser-wire run Our latest plans for our work at the ATF are posted at: http://www-pnp.physics.ox.ac.uk/~delerue/laserwire/atf.php 4/8

  5. Results from this trip • The APD has been validated but another detector may better suit our needs… • Some preliminary tests have been done for the DAQ. • A design is ready for the laser delivery and diagnostics optics. • Better idea of the beam jitter (thanks to the nanoBPM group). • Learned a lot about the laser and the ATF timing system (thanks to the Compton e+ group and Naito-san). • Lots of discussion on the vacuum vessel design and the lens design (still need to finalize the discussions) • Need for more work on the electron beam optics has been uncovered. 5/8

  6. APD signal at the Compton IP • After some alignment we observed signal in the APD when inserting the screens located near the Compton IP. • Signal seen with “Y” screen but no with “X” screens (not installed). 6/8

  7. Wire scan with the APD and our DAQ Beam profile with our system (not great yet) 7/8

  8. Future plans • Our goal is to perform our first scan by the end of the year but… • There is still a lot of work to be done: • Electron beam optics and diagnostics • Vacuum vessel • Lens design • Laser delivery and diagnostics (scheme proposed this week) • DAQ • Put everything together • We would like to thank people from the ATF and from SLAC for their help and their support 8/8

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