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Laser-wire at the ATF extraction line

The Laser-Wire project aims to achieve a 1-micrometer resolution measurement of electron beam profiles at the ATF extraction line, involving teams from leading universities and research institutes. Key methods include high-power laser technology, advanced focusing optics, and comprehensive diagnostics tools. The project spans multiple phases in 2005, including site visits for detector studies, commissioning of equipment, and initial measurements. Current progress includes lens design and vacuum vessel development, with a focus on achieving precise profiling capabilities.

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Laser-wire at the ATF extraction line

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  1. Laser-wire at the ATF extraction line People involved Goals Features Schedules Current status Summary February 2005 http://www-pnp.physics.ox.ac.uk/~delerue/laserwire/atf.php

  2. People and institutes involved • 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 • University College London:Stewart Boogert, Steve Malton • KEK:Hitoshi Hayano, Pavel Karataev, Kiyoshi Kubo, Junji Urakawa • SLAC:Josef Frisch, Marc Ross

  3. Goals and requirements Goal: Measure the electron beam profile with a resolution of 1 micrometer. To achieve this we need • A high power laser to produce enough photons • A lens to focus the laser to a spot size of ~1micrometer. • Basic laser and accelerator diagnostics tools Simulations with CAIN

  4. Features of our system(still under discussion) • Focusing of the laser to a 1 micrometer spot size • Focusing optics outside the vacuum (makes the design easier) • The vacuum window will be made of optical glass differentially pumped • Laser diagnostics outside the vacuum • OTR in the vacuum vessel • Coarse scanning of the electron beam by the laser done by moving the vacuum vessel and the focusing optics • Fine scanning done in the laser hut • Use relay optics to repeat the fine scanning at the Interaction Point

  5. Schedules for 2005 • March: Trip to KEK to study the photon detector (APD), the laser and the DAQ. • May-June: Trip to KEK to finalize the DAQ issues and prepare laser optics • July: Commissioning of the vacuum vessel in Oxford • August: Vacuum vessel shipped to KEK • September: Installation of the vacuum vessel in the ATF extraction line and installation of the laser focusing optics • November & December: Commissioning of the full system and (hopefully) first profile measurements

  6. Current status • The laser focusing lens is being designed • Interactions of the laser and the electron beam with our proposed parameters (strong focusing,…) have been studied • Test lab in Oxford is almost completed • Vacuum vessel design will be completed by the end of the month. • We will come to the ATF in March.Goals of our trip in March: • Do a wire-scanner measurement with our DAQ • Study the high power laser • Study the beam jitter • Gain experience of ATF operations

  7. Summary • We want to measure the beam profile at the ATF with a resolution of 1 micrometer • A lens focusing the laser to 1 micrometer is being designed • Design of the vacuum vessel is under-way • We will come 4 times to the ATF before the end of the year to prepare our measurement • We aim to do a first profile measurement before the end of 2005. http://www-pnp.physics.ox.ac.uk/~delerue/laserwire/atf.php

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