FACET Status ESTB 2011 Workshop

Christine ClarkeMarch 17th 2011

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The FACET Project

Facilities for Accelerator science and Experimental Test beams.

FACET

ESA

ESB

Beam at FACET

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At IP

• FACET uses the first two-thirds of the linac• Energy = 23 GeV• 3.2 nC• Sigma x = 14 um• Sigma y = 6 um• Sigma z = 14 um minimum (20 um typical)• Bunch length can be increased up to a factor of 3• Electrons and positrons

The Facility

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Stairway in Sector 19

User Trailer Experiments Dump

Towards end of linacBeam Direction

Plan – THz and IP Tables

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• Optical Tables for experimenters to mount hardware

• Optics set up for each experiment• Small beam spots in IP region

THz Table (Experimental Area 1)

IP Table (Experimental Area 2)

Beam Direction

THz and IP Optical Tables

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THz Table (looking east towards dump)

IP Table (looking east towards dump)

• Photos taken Feb 11 (Mark Hogan)

• Magnets installed since then.

Current Status

• Magnets installed in sector 20 – photo taken yesterday:

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THz Table (looking east towards dump)

IP Table

Plan – Dump Table

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Dump Table(Experiment Area 3)

• Beam size: 55um x 25um

Plasma Wakefield Acceleration

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• Continuation of very successful FFTB experiments

• Heat-pipe oven to be installed this summer

• Lithium metal vaporized at 800ºC• Length of plasma controllable by

controlling heaters and pressure of helium buffer gas

• Isolated by Be windows

Plasma Wakefield Acceleration cont.

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• What is maximum energy gain available?

• Instabilities?• Self-injected particles?• Phase One: Begin with single electron

bunch in field ionized lithium plasma.• Phase Two: Single bunch in field

ionized cesium plasma.• Phase Three: Use Notch Collimator.• Phase Four: Two electron bunches

(drive and witness) in field ionized cesium plasma.

• After first year, pre-ionized plasma, positrons, positrons and electrons.

Smith Purcell

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• Bunch Time Profile measurements with Coherent Smith-Purcell Radiation

• Moderate band-width terahertz

• Beam passes by grating which has a dispersive effect

• Continuation of experiment at ESA

• Not sensitive to beam spot size (will be situated upstream of IP).

• Non-destructive (parasitic running).

Wakefield Acceleration in Dielectric Structures

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• GV/m class DWA for use in linear colliders and future light sources.

• Previous work at FFTB/SLAC, UCLA, BNL.• High gradient regime at FACET.• FACET beam sent through prototype

dielectric wakefield acceleration structures.• Parametric breakdown studies and lifetime

effects.• Vary structures (dimensions, materials etc). • Use drive and witness bunches to observe

acceleration.• Use coherent Cerenkov radiation• Next year, use protons.

Ultrafast Magnetic Switching

• Continuation of FFTB work.• Change in magnetization of a sample on ultrafast

timescales• Change pulse-lengths with constant Q - do longer

pulse-lengths have more energy deposition?• Expose sample to electron bunch• Then image with spin-sensitive scanning electron

microscope.• Different patterns on same film indicate different

physical processes.• Chaos cannot be explained• Need to rule out experimental artefacts.

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2.3ps

70fs

Other Experiments

• Metallic Periodic Structures– Short-pulse, high fields to study breakdown physics.

• CLIC Studies (letter of intent)– Dispersion-free steering – Accelerating structure Wakefield Studies– Collimator Wakefield Studies

• THz extraction (expression of interest)– Power meter and thermal camera to measure the THz

from the existing FACET bunch length monitor foil. – Extract radiation to an experimental area

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30cm High Power test structure (CLIC Studies)

Suggested extraction of THz

Short Metallic Accelerating Structure

Schedule 2011

• Construction Phase 1 will be complete in May.• Beam Commissioning starts June 13th

• Transitioning to…• User-aided commissioning/Experimental program in July and

August• Users meeting in August• Next round of proposals coming up• Second SAREC review likely October• Construction Phase 2… positron arm of the bunch compressor

in S10• Experimental PPS zone

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Schedule 2012 and Beyond

• FACET will run for 4 months each year for the next five years.• In 2012 the 4 months are likely to be February - June.• Electron beams and positron beams will be available to the

experimenters.• Sector 20 has areas in which experiments can be installed with good

support.• Very flexible facility

• 2013? Phase Three: positron arm of the bunch compressor in S20 (aka the sailboat chicane) for simultaneous electron and positron beams

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Summary

• FACET is a test facility for Plasma Wakefield experiment with flexibility to serve many other experiments.

• Unique high power beams• Installation on track• First Beam June 13th

• Approximately 2 weeks of beam commissioning• User aided commissioning / first science, July and August.• New round of proposals for 2012 due (provisionally) October.• 4 months of FACET running in 2012 and every year until 2017.

• See you at the FACET satellite Meeting at PAC? Marriott Marquis Tuesday March 29, 2011 from 6:00pm-8:00pm in the Brecht Room on the 4th Floor.

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