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FACET

FACET. Andrei Seryi FACET Project Manager 2009 SLUO Annual Meeting - September 17th 2009. What is FACET. F acility for A dvanced A c celerator E xperimental T ests FACET will provide short, intense pulses of e- and e+ to study plasma wakefield acceleration

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FACET

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  1. FACET Andrei Seryi FACET Project Manager 2009 SLUO Annual Meeting - September 17th 2009

  2. What is FACET • Facility for Advanced Accelerator Experimental Tests • FACET will provide short, intense pulses of e- and e+ to study plasma wakefield acceleration • FACET scope includes beamlines in Sector 20, a new arm of the chicane in Sector 10 and a generic experimental area • FACET will also allow a vast range of experiments for variety of science applications

  3. DOE Mission and FACET • DOE Office of Science • advance basic research and the instruments of science that are the foundations for technology innovation, and a source for remarkable insights into our physical and biological world and the nature of matter and energy • High Energy Physics • understanding how universe works at its most fundamental level • to enable these discoveries, supports theoretical and experimental research in elementary particle physics & fundamental accelerator science & technology • Plasma wakefield acceleration, with its potential for a 1000-fold or more increase in acceleration gradient, is one of the most promising approaches for dramatic reduction of the size and cost of future accelerators, particularly high-energy electron-positron colliders • Mission Need Statement for an Advanced Plasma Accelerator Facility was signed by Dr. Raymond Orbach, Under Secretary for Science, on January 28, 2008 and Critical Decision 0 was approved on February 27, 2008 • Facility for Advanced Accelerator Experimental Tests • provides short, intense pulses of e- and e+ to study a variety of critical issues associated with plasma acceleration • meet the mission need statement for Advanced Plasma Acceleration Facility

  4. Project Overview • FACET is ARRA funded MIE project which includes • new Beamline System in Sector 20 • additional arm of Bunch Compressor in Sector 10 • generic Experimental Area • Key Performance Parameters for CD4 validation • allow timely transition to science required parameters • Project team in place & proceeding with project execution • Project is well defined and design is mature • Estimated cost range: $14.5-16.0M (TPC) • Baseline target: $14.5M of available ARRA funds • Project schedule: 24.5 months • DOE CD1 review July 30-31: committee recommended CD1 approval • ESAAB meeting approved CD-1 on Sep 10, 2009

  5. Project team and collaborations • Project team at SLAC: • J.Amann, K.Bane, L.Bentson, D.Blankenship, E.Carrone, J.Chan, R.Chestnut, S.DeBarger, F.-J.Decker, A.DeLira, R.Erickson, C.Hast, M.J.Hogan, B.Ilinets, R.Iverson, J.Keller, J.Kenny, J.Krebs, N.Li, J.J.Lipari, D.B.MacFarlane, S.Mao, P.Miller, Y.Nosochkov, T.O.Raubenheimer, P.Rodriguez, M.Santana, J.T.Seeman, A.Seryi, H.Shin, R.Singh, C.Spencer, J.Vollaire, D.Walz, W.Wittmer, M.Woodley, G.Yocky • Science collaborations in place: • PWFA: • Joshi Group @ UCLA (20+ years PWFA & LWFA plasma physics) • Mori Group@ UCLA (Advanced computation/simulation) • Muggli Group @ USC (Experimental plasma physics) • Katsouleas Group @ Duke (Plasma theory) • DWA: • Rosenzweig Group @ UCLA (DWA theory & experiments) • Euclid Tech (Advanced materials) • Solid state, THz, magnetism • Stöhr/Siegmann Groups at SLAC (Solid state physics) • Expecting (and encouraging!) additional collaborations to form I am grateful to M.Hogan, L.Bentson, W.Wittmer, Y.Nosochkov, S.Mao, J.Vollaire, J.Stohr, et al. for providing materials and slides for this presentation

  6. FACET goals • Unique properties of SLAC e+ and e- beams (high energy, ultra-short, high charge) give worldwide unique science opportunities for variety of fields: • e- and e+ plasma acceleration as primary goal • Plasma lens for compact focusing • Bent crystal for beam collimation or photon source • Dielectric wakefield acceleration • Generation of THz radiation for materials studies

  7. Scope of work & Operation modes Sector 20 • Operation modes that FACET Project will provide: • electrons to Sector 20 Experimental Area (CD-4A) • (After construction of Sector 20 chicane. Completed first.) • positrons to Sector 20 Experimental Area (CD-4B) • (After construction of Sector 10 e+ arm of chicane.) • (Polarity of S20 chicane will be switched, to provide the e+ mode) • After a future upgrade (not in the Project scope) may also haveboth e- and e+, simultaneously delivered to Sector 20 Sector 10 Focal point Existing e- chicane e- (or e+) compressor chicane & FF New e+ chicane

  8. FACET parameters for Science • Project deliverables: Key Performance Parameters (KPP) for CD-4A (& B): • Electron (Positron) Energy 23 GeV • Electron (Positron) Charge > 1 nano Coulomb • KPP allow validation of new beamlines and timely transition to science parameters

  9. Org: DOE-SSO-SLAC DOE-SC / Office of High Energy Physics Dennis Kovar, Director (Acquisition Executive) LK Len, FACET Program Manager DOE-SLAC Site Office Paul Golan, Manager Hanley Lee, FACET Federal Project Director SLAC National Accelerator Laboratory Persis Drell, Director David MacFarlane, PPA Director Andrei Seryi, FACET Project Manager

  10. FACET Org chart Channel for proposal submission for FACET (being formed) Particle Physics And Astrophysics MacFarlane, David Associate Laboratory Director AD / LCLS Interface Acc. Directorate Knutson, Dale ALD Seeman, John Dept. ALD Sector-0-20 Division Wienands, Uli SLAC / PPA Experimental Program Advisory Committee Project Manager Seryi, AndreiDeputy Project Manager Krebs, Jim Project Safety Kenny, Joe Advisory Boards PMOG 1.1 Financial Alva, Rafael, Byrne, Rob Procurement King, Jerry Administration Meyers, Jill Special Assistant Hast, Carsten Project control J.Chan, R.Singh LCLS Interfaces Engineering, Acc. physics. Area Mngrs. Experimental Area Hogan, Mark Common Systems & Accelerator Integration Wittmer, Walter Beamline Systems & Engineering Integration Bentson, Lynn Experimental Community 1.2 1.4 1.3 1.5

  11. FACET Schedule Overview Pilot science experiments start early-mid 2011 Anticipate 4 month/year beam runs Science program: 5 years after CD4B

  12. View of beamlines New stair case in S19 • Sector 20 • Bunch compressor, final focus, experimental area and beam dump Sector 10 bunch compressor Experimental area,instrumentation and dump ~30 meters for experiments

  13. Optics designand optics modifications in Linac New positron chicane in Sector-10 and focusing adjustment Focusing adjustment in Sector-19 and in e+ production line New optics in Sector-20: chicane, Final Focus and experiment line

  14. DR Sec-10 Sec-20 Bunch length compression in Linac Bunch compression is achieved through manipulation of beam energy spread and bunch length along the Linac using momentum compaction of bending systems and optimization of RF accelerating phase. Illustration of bunch length compression along the Linac

  15. Generate two bunches by selectively collimating during bunch compression process Exploit Position-Time Correlation on e- bunch to create separate drive and witness bunch Adjust final compression dp/p [%] Disperse the beam in energy z [mm] dp/p [%] x [mm] ...selectively collimate

  16. R56 = 4 mm, Ds = 52.7 mm e+ upgrade e+ e+ Shared linac Shared FF sailboat chicane IP sx = sy h = 0 e- e- e- R56 = 4 mm 64 m Chicane optics in Sector-20 • Requires R56 = 4 mm for final compression of bunch length • Chicane optics is compatible with “sailboat chicane” upgrade • The upgrade e+ chicane is designed for 52.7 mm longer path length to correctly position the drive (e-) and witness (e+) bunches in wakefield plasma experiment

  17. Sailboat Chicane Upgrade will enable full exploration of plasma acceleration of e+ in e- wakes • Extract e- & e+ from damping rings on same linac pulse • Accelerate bunches to sector 20 5cm apart • Use ‘Sailboat Chicane’ to put them within 100µm at entrance to plasma • Large beam loading of e- wakes with high charge e+ beams Focal Point: Dz = -0.1mm e+ RF e+ e- Dz = 5 cm z (m)

  18. X Y Z Beam sizes at FACET IP • DIMAD tracking simulation • Initial longitudinal beam spread from LiTrack simulation. • IP sizes (sx=13.6, sy=8.8, sz=19.9 mm) are within the FACET goal. dE/E

  19. LCLS and FACET FACET LCLS FACET LCLS SDMP Sector 20 Wall

  20. Worst case: 16 W loss on SDMP 0.5 mrem/h < 0.5 mrem/h at target height • The shield wall adequately protects the FACET area

  21. FACET Access

  22. FLUKA Implementation Solid Edge Design FACET beam dump design • Copper and tungsten dump, surrounded by steel and borated poly shielding • Additional shutter to reduce the residual dose rate in the experiment • Ensures negligible dose outside the tunnel and low dose in the experimental area

  23. Control system • Control system approach: hybrid solution • Use the LINAC basically as is, on a legacy system • Implement the renewed Sector 20 in EPICS, with very minor exceptions in both cases • LCLS has dealt with the hybrid issue and we are able to draw from this experience and use established solutions.

  24. Facility for Advanced Accelerator Experimental Tests Unique properties of SLAC e+ and e- beams (ultra-short, high charge) provide worldwide unique opportunities for accelerator research at FACET e- e+ Focal Point: Dz = -0.1mm RF Two electron bunches formed by notch collimator will allow study energy doubling, high efficiency acceleration, emittance preservation e- e+ Dz = 5 cm “Sailboat” dual chicane will give unique opportunity to study acceleration of positrons by an electron bunch • Unique science opportunities for variety of fields: • e- and e+ plasma acceleration as primary goal • Plasma lens for compact focusing • Bent crystal for beam collimation or photon source • Dielectric wakefield acceleration • Generation of THz radiation for materials studies Short bunches and their Tera-Hz radiation open new possibilities to study ultrafast magnetization switching

  25. Summary • FACET will be a new test facility at SLAC • First science experiments: early-mid 2011 • Unique beams • 23 GeV, high current (~20KA), small spots (~10mm) • Will enable reach science • e- and e+ plasma acceleration • Plasma focusing • Bent crystal as photon source • Dielectric wakefield acceleration • THz radiation for materials studies, etc • Many other experimental opportunities • Vast range of possible applications • Many opportunities for existing collaborations to grow and for new collaborations to form

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