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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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Presentation Transcript
slide1

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

slide2

Linear Collider

Energy/beam = 250-500 GeV

ECM = 0.5-1.0 TeV

David L. Rubin

slide3

Electron cloud

David L. Rubin

shielded pickup
Shielded pickup

David L. Rubin

shielded pickup1
Shielded Pickup

With no magnetic field, electrons come from the floor of the chamber

David L. Rubin

cloud evolution witness bunch studies
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

slide7

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

slide8

D-line xbsm - positrons

σ =17μm

εv= 18pm

Low emittance tuning procedure typically yields sub 20pm in one or two iterations

David L. Rubin

32 channel detector o utput for 20 bunches 1 ma per bunch

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

slide10

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

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