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CESR Test Accelerator – Investigation of the physics of charged particle beams

CESR Test Accelerator – Investigation of the physics of charged particle beams. Circumference = 768m - Beam energy 1.8-5.5 GeV - Electrons and Positrons. Linear Collider Energy/beam = 250-500 GeV E CM = 0.5-1.0 T eV. Electron cloud. Shielded pickup.

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CESR Test Accelerator – Investigation of the physics of charged particle beams

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  1. CESR Test Accelerator – Investigation of the physics of charged particle beams Circumference = 768m - Beam energy 1.8-5.5 GeV - Electrons and Positrons David L. Rubin

  2. Linear Collider Energy/beam = 250-500 GeV ECM = 0.5-1.0 TeV David L. Rubin

  3. Electron cloud David L. Rubin

  4. Shielded pickup David L. Rubin

  5. Shielded Pickup With no magnetic field, electrons come from the floor of the chamber David L. Rubin

  6. Cloud Evolution: Witness Bunch Studies TiN Chamber Cloud is generated by the first bunch. The witness bunch follows and kicks the cloud electrons into the pickup. Decay time of the cloud is evident. David L. Rubin

  7. Example: Positron Witness Bunch Study at 2GeV Peak SEY Scan Coherent Tune Shifts (1 kHz ~ 0.0025), vs. Bunch Number - 21 bunch train, followed by 12 witness bunches - 0.8×1010 particles/bunch - 2 GeV. - Data (black) compared to POSINST simulations. SEY=2.0 SEY=2.2 Train SEY=1.8 Witnesses David L. Rubin

  8. D-line xbsm - positrons σ =17μm εv= 18pm Low emittance tuning procedure typically yields sub 20pm in one or two iterations David L. Rubin

  9. C-line – electron beam size 20 bunches,14 ns spacing, 32 channels, pinhole optics Capability to measure bunches spaced by as few as 4ns 32 Channel Detector Output For 20 Bunches, 1 mA Per Bunch David L. Rubin

  10. C-line – electron beam size CesrTA Grad students Joe Calvey – Electron cloud Jim Shanks – Low Emittance Tuning Mike Ehrlichman – Intra-beam scattering David L. Rubin

  11. David L. Rubin

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