FACET Update ARD Status Meeting Christine Clarke April 14th 2011 The FACET Project Facilities for Accelerator science and Experimental Test beams. FACET ESB ESA FACET Update Page 2
Beam at FACET FACET uses the first two-thirds of the linac Energy = 23 GeV 3.2 nC Sigma x = 14 um At IP Sigma y = 6 um Sigma z = 14 um minimum (20 um typical)
Bunch length can be increased up to a factor of 3 Electron beam (2011) FACET Update Page 3 The Facility Stairway in Sector 19 User Trailer Experiments Dump Towards end of linac Beam Direction
FACET Update Page 4 Plan THz and IP Tables THz Table (Experimental Area 1) IP Table (Experimental Area 2) Optical Tables for experimenters to mount hardware Optics set up for each experiment Small beam spots in IP region Beam Direction
FACET Update Page 5 THz and IP Optical Tables IP Table (looking east towards dump) THz Table (looking east towards dump) Photos taken Feb 11 (Mark Hogan) Magnets installed since then. FACET Update Page 6 March
Some magnets installed in sector 20 photo taken March 16th : THz Table (looking east towards dump) IP Table FACET Update Page 7 April All magnets in sector 20 photo taken last Tuesday : THz Table (looking east towards dump) IP Table FACET Update
Page 8 Close-up of THz Beamline almost complete Initial THz diagnostics with OTR foils (1um titanium) Cubes Beam here large in x (>1mm) Future location of Smith-Purcell experiment. FACET Update Page 9
Close-up of IP Table Could be complete end of next week IP experiments located here (second table to come). For tuning, vacuum drifts, wire scanner and OTR screens. FACET Update Page 10 SAREC Final Report SLAC Accelerator Research Experimental program Committee Convened in January to review 8 proposals
6 proposals accepted as Experimental Programs 1 proposal incorporated into FACET diagnostics (ODR) 1 letter of intent requested to present two proposals in the next round. 1 expression of interest asked to make preliminary measurements this summer (THz). Second call for proposals this fall for the spring 2012 and 2013 runs SAREC review in the early winter of 2012. FACET Update Page 11
Plasma Wakefield Acceleration Continuation of very successful FFTB experiments Heat-pipe oven to be installed this July Lithium metal vaporized at 800C Length of plasma controllable by controlling
heaters and pressure of helium buffer gas 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. FACET Update Page 12 Smith Purcell 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). FACET Update Page 13 Wakefield Acceleration in Dielectric Structures 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. FACET Update Page 14 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 2.3ps Need to rule out experimental artefacts. 70fs FACET Update Page 15
Additional Experiments Metallic Periodic Structures (Accepted Proposal) Short-pulse, high fields to study breakdown physics. High gradient dielectric wakefield measurements (Accepted Proposal) dielectric based collimating systems CLIC Studies (letter of intent) Dispersion-free steering Accelerating structure Wakefield Studies Collimator Wakefield Studies Suggested THz extraction (expression of interest)
extraction Extract radiation to an experimental area of THz Short Metallic Accelerating Structure 30cm High Power test structure (CLIC Studies) FACET Update Page 16 Schedule 2011
Construction Phase 1 will be complete in May. Beam Commissioning starts June 13th Experiments are installed July 5th- July 14th Experimental program in August Users meeting August 29th /30th Next round of proposals coming up (fall) Construction Phase 2 positron arm of the bunch compressor in S10 Experimental PPS zone FACET Update Page 17 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. 2013? Phase Three: positron arm of the bunch compressor in S20 (aka the sailboat chicane) for simultaneous electron and positron beams FACET Update Page 18 Summary FACET is currently near the end of its primary construction phase. First Beam June 13th Approximately 3 weeks of beam commissioning, some User assistance. User aided commissioning / experiment commissioning program, August. New round of proposals for 2012 due (provisionally) October. 4 months of FACET running in 2012 and every year until 2017.
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