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PRESENTATION AT ATF USERS’ MEETING – APRIL 4-6, 2007

PRESENTATION AT ATF USERS’ MEETING – APRIL 4-6, 2007. AFTER LACARA ? J. L. Hirshfield 1,2 on behalf of the Yale-Columbia-Omega-P collaboration, including S.V. Shchelkunov, 3 T.C. Marshall, 3 and M.A. LaPointe 1

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PRESENTATION AT ATF USERS’ MEETING – APRIL 4-6, 2007

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  1. PRESENTATION ATATF USERS’ MEETING – APRIL 4-6, 2007 AFTER LACARA? J. L. Hirshfield1,2 on behalf of the Yale-Columbia-Omega-P collaboration, including S.V. Shchelkunov,3 T.C. Marshall,3 and M.A. LaPointe1 1Department of Physics, Yale University, P.O. Box 208124, New Haven, CT 06520-8124 2Omega-P, Inc., 199 Whitney Avenue, Suite 200, New Haven, CT 06511 3Department of Applied Physics, Columbia University, New York, NY 10027 Research sponsored by US DoE, DHEP.

  2. PRESENTATION ATATF USERS’ MEETING – APRIL 4-6, 2007 LAserCyclotron (AutoResonance) Accelerator LACARA is the only vacuum accelerator that can accelerate a non-pre-bunched beam, with all particles receiving nearly-equal energy gains.

  3. PRESENTATION ATATF USERS’ MEETING – APRIL 4-6, 2007 So what is planned for after the LACARA experiments described yesterday by Sergey? A three-stage program for three-to-five more years is anticipated: A. Increase energy gain using more CO2 laser power. (MeV) 65 MeV, 5.2 T 50 MeV, 6.2 T 35 MeV, 8.4 T TW of laser power B. Create a beam of femtosecond bunches by chopping. C. Build an optical-scale high-gradient wake field accelerator driven by the train of fs sheet bunches.

  4. PRESENTATION ATATF USERS’ MEETING – APRIL 4-6, 2007 Portrait of beam emerging from LACARA (using emittance filter) x-y (time integrated) x-t (fixed y) After the LACARA magnet, accelerated particles move on inclined rectilinear orbits, cycling at 2.9 x 1013 Hz, or about 30 revolutions in each picosecond.

  5. PRESENTATION ATATF USERS’ MEETING – APRIL 4-6, 2007 Create chopped beam using beam stop with small aperture A beam stop of 2-cm thick tungsten, with a 1-mm diameter inclined hole, allows transmission of crisply-chopped fs microbunches once each optical cycle. N holes located at 360/N can create micro-bunches at the N th optical harmonic.

  6. PRESENTATION ATATF USERS’ MEETING – APRIL 4-6, 2007 Create a train of fs, pC sheet bunches using a quadrupole, and inject the beam into a micron-scale planar dielectric structure to generate intense wake fields for acceleration of a test bunch sheet beam is 10’s of µm x 3 mm planar dielectric structure

  7. PRESENTATION ATATF USERS’ MEETING – APRIL 4-6, 2007 Calculated wake fields for injection of one-to-ten 1 pC sheet bunches (10µ x 150µ x 1µ) into a micro-structure of height (width) 150µ (19µ), and gap width of 15µ. Dielectric constant  = 3.0 (NaCl or BaF2) with low infrared losses. one bunch (~60 MeV/m) two bunches (~120 MeV/m) three bunches (~180 MeV/m) ten bunches (~600 MeV/m)

  8. PRESENTATION ATATF USERS’ MEETING – APRIL 4-6, 2007 Summary: • There is life after near-term LACARA experiments, first to exploit maximum available laser power at ATF to obtain energy doubling, e.g. 40 MeV  80 MeV, or maybe more. • Insertion of a W chopper into the beam after LACARA can create a train of ~20-100 crisply chopped fs, pC bunches, at intervals equal to the laser period or sub-multiples of it. • These bunches can be focused/defocused by a quadrupole into a train of micron-scale sheet bunches for injection into a micron-scale planar dielectric structure, to generate wake fields of 100’s of MeV/m, maybe as high as 1 GeV/m. • LACARA-ology can have an exciting future at ATF for years to come, in the humble opinion of the speaker.

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