Скачать презентацию FACET Review End Station A Facility and Science Скачать презентацию FACET Review End Station A Facility and Science

abbfd9f231419510e0ddf24826a4054e.ppt

  • Количество слайдов: 41

FACET Review: End Station A Facility and Science ESA provides 2 nd experimental facility FACET Review: End Station A Facility and Science ESA provides 2 nd experimental facility • expands FACET’s science capabilities • improves operational efficiency • increases cost effectiveness of the investment M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 1

OUTLINE End Station A Facility • Experimental Hall and Counting House • Operational Modes OUTLINE End Station A Facility • Experimental Hall and Counting House • Operational Modes & Beam Parameters Science • Accelerator science and beam instrumentation w/ primary electron beam • Activation, residual dose rates and materials damage studies w/ beam dump tests • Detector R&D using secondary electrons and hadrons • Particle Astrophysics Detectors and Techniques Recent Experiments ESA Program starting in 2011 → FACET-ESA provides unique science capabilities! M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 2

2 -Mile Linac M. Woods, SLAC End Station A DOE FACET Review, Feb. 19, 2 -Mile Linac M. Woods, SLAC End Station A DOE FACET Review, Feb. 19, 2008 3

End Station A (ESA) • • ESA is large (60 m x 35 m End Station A (ESA) • • ESA is large (60 m x 35 m x 20 m) 50 (and 10) ton crane Electrical power, cooling water DAQ system for beam and magnet data DOE FACET Review, Feb. 19, 2008 4

End Station A Facility and Experimental Layout in 2006 -08 *Dimensions given in ft End Station A Facility and Experimental Layout in 2006 -08 *Dimensions given in ft • Primary beam experiments inside concrete bunker • Beam dump experiments inside concrete bunker (or in Beam Dump East beamline) • Secondary electrons for Detector Tests in open region after the concrete bunker M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 5

ANITA Payload and Ice Target in ESA T-486 (2006) Ø Calibrated entire ANITA balloon ANITA Payload and Ice Target in ESA T-486 (2006) Ø Calibrated entire ANITA balloon flight antenna array; major contribution to the experiment! Ø First observation of the Askaryan effect in ice Ø Results published in Phys. Rev. Lett. 99: 171101, 2007 v illustrates capability of ESA Test Beam Facility M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 6

ESA Science: Recent Experiments ILC Program 2006 – 2007 (+ 2008? ) Detector R&D ESA Science: Recent Experiments ILC Program 2006 – 2007 (+ 2008? ) Detector R&D Particle Astrophysics Activation, Residual Dose Rates & Materials Damage Studies M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 7

Linear Colliders → ESA Program Machine-Detector Interface at the ILC • • • (L, Linear Colliders → ESA Program Machine-Detector Interface at the ILC • • • (L, E, P) measurements: Luminosity, Energy, Polarization Forward Region Detectors Collimation and Backgrounds Interaction Region (IR) Engineering: Magnets, Crossing Angle EMI (electro-magnetic interference) in IR MDI-related Experiments at SLAC’s End Station A • • Collimator Wakefield Studies Energy spectrometer prototypes IR background studies for IP BPMs EMI studies Beam Instrumentation Experiments in ESA • • RF BPM prototypes for ILC Linac Bunch length diagnostics for ILC M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 8

ILC Beam Tests in End Station A BPM energy spectrometer (T-474/491) Synch Stripe energy ILC Beam Tests in End Station A BPM energy spectrometer (T-474/491) Synch Stripe energy spectrometer (T-475) Collimator design, wakefields (T-480) Bunch length diagnostics (T-487) IP BPMs—background studies (T-488) LCLS beam to ESA (T 490) Linac BPM prototypes EMI (electro-magnetic interference) + Si. D KPi. X Test during T-492 http: //www-project. slac. stanford. edu/ilc/testfac/ESA/esa. html M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 9

ILC Beam Tests in End Station A 50 Participants from 16 institutions at SLAC ILC Beam Tests in End Station A 50 Participants from 16 institutions at SLAC in 2006/07 for this program Birmingham U. , Cambridge U. , Daresbury, DESY, Dubna, Fermilab, Lancaster U. , LLNL, Manchester U. , Notre Dame U. , Oxford U. , Royal Holloway U. , SLAC, UC Berkeley, UC London, U. of Oregon Wakefield Studies from MCC T-474 and EMI Test Users in ESA Counting House M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 10

ESA Equipment Layout Wakefield box Wire Scanners blue=FY 06 red=new in FY 07 rf ESA Equipment Layout Wakefield box Wire Scanners blue=FY 06 red=new in FY 07 rf BPMs “IP BPMs” T-488 18 feet T-487: long. bunch profile Ceramic gap for EMI studies Dipoles + Wiggler Ø able to run several experiments interleaved in a compatible setup Ø typically rotate which experiment has priority every 2 -3 shifts during a 2 -3 week run M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 11

Prototype Energy Spectrometers BPM Energy Spectrometer • ILC needs precision energy measurements, 50 -200 Prototype Energy Spectrometers BPM Energy Spectrometer • ILC needs precision energy measurements, 50 -200 ppm, e. g. for Higgs boson and top quark mass measurements • BPM & synchrotron stripe spectrometers evaluated in a common 4 -magnet chicane. U. Cambridge, DESY, Dubna, Royal Holloway, SLAC, UC Berkeley, UC London, U. of Notre Dame Synch Stripe Spectrometer U. of Oregon, SLAC BPM 4, 7 Vertical Wiggler BPM 3, 5 D 1 D 2 D 3 BPM 9 -11 Wiggler synchrotron stripe Detector is downstream D 4 Energy Scan measured with Chicane BPMs For BPM spectrometer • d. E/E=100 ppm → dx= 500 nm, at BPMs 4, 7 Dipole B-field ~ 1 k. Gauss Ø these are same as for ILC design M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 12

Prototype Linac RF BPMs S-Band BPM Design (36 mm ID, 126 mm OD) Q~500 Prototype Linac RF BPMs S-Band BPM Design (36 mm ID, 126 mm OD) Q~500 for single bunch resolution at ILC y 4 (mm) 550 nm BPM res. y 5 (mm) M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 13

Resolution & Stability: Linking BPM Stations in ESA BPMs 1 -2 x Run 2499 Resolution & Stability: Linking BPM Stations in ESA BPMs 1 -2 x Run 2499 -2500 BPMs 3, 5 BPMs 4, 7 BPMs 9 -11 Wake. Field Box Chicane region 30 meters v use BPMs 1, 2 and 3, 5 and 9 -11 to fit straight line • predict beam position at BPMs 4 • plot residual of BPM 4 wrt predicted position y Run 2499 -2500 Run *0. 5 mm → 100 ppm “error” bars shown are rms resolution → investigating long-term (hours) stability at sub-micron level; study dependence on beam parameters and environment (temperature, magnetic fields) and electronics stability → stability studies important for Linac BPM and quad magnetic center stability requirements (also of interest for system of 40 RF BPMs for LCLS undulators) M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 14

Energy Spectrometers: Future Measurements & Tests Needed BPM Spectrometer: • establish BPM calibration procedure Energy Spectrometers: Future Measurements & Tests Needed BPM Spectrometer: • establish BPM calibration procedure and frequency • establish energy spectrometer calibration procedure and frequency (requires reversing chicane polarity) • can luminosity be delivered during calibrations? • establish requirements for temperature stability, vibrations from water systems Synchrotron Stripe Spectrometer: • still need to demonstrate proof-of-principle with quartz fiber detectors; will need 24 Ge. V beam rather than 12 Ge. V beam • study concept using visible light detection; hope to test in 2008 Both systems: • want to compare results from the 2 systems; do they agree? • is 50 ppm accuracy achievable? • tests evolve from concepts to prototypes to qualifying production components → need tests prior to completion of ILC beam delivery system M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 15

Collimator Wakefields Collimators remove beam halo, but excite wakefields. Goal: determine optimal collimator material Collimator Wakefields Collimators remove beam halo, but excite wakefields. Goal: determine optimal collimator material and geometry → Beam Tests address achieving design luminosity → effects determine collimation depth and radius of vertex detector Collaborating Institutions: U. of Birmingham, CCLRC-ASTe. C + engineering, CERN, DESY, Manchester U. , Lancaster U. , SLAC, TEMF TU Concept of Experiment 2 doublets BPM Two triplets BPM ~40 m BPM 15 m Vertical mover M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 16

Collimator Wakefields 1500 mm Concept of Experiment 2 doublets BPM Two triplets BPM ~40 Collimator Wakefields 1500 mm Concept of Experiment 2 doublets BPM Two triplets BPM ~40 m Vertical mover M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 BPM 15 m 17

Results from 2007 Data Col. 6 a = 166 r = 1. 4 mm Results from 2007 Data Col. 6 a = 166 r = 1. 4 mm Col. 12 a = 166 mrad r = 1. 4 mm • Collimator 6 was also measured in Run 1, with consistent result. • Collimator 12 is identical to 6 for taper angle and gap, but it has a 2. 1 cm flat section • A total of 15 different collimator geometries were tested in 2006 and 2007 (differing taper angles, gaps, length of flat sections, materials and surface roughness) M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 18

Collimator Wakefields: Future Measurements & Tests Needed Comparing with Analytic Calculations and 3 -d Collimator Wakefields: Future Measurements & Tests Needed Comparing with Analytic Calculations and 3 -d modelling: • consistency with existing data varies from 10% level to a factor of 2 disagreement depending on geometry • goal is to accurately model wakefield effects to 10% • in some cases better modeling is needed; but also need more accurate data for some geometries as well as new data for different geometries and materials Broad interest in Wakefield tests: • relevant for linear colliders, LHC, low emittance light sources Future measurements: • best done with low energy beams; desire for relatively low emittance and short, well understood bunch lengths • bunch lengths may be too long for FACET-ESA to be very useful; → can do these experiments at ASF • later upgrade for an RF gun at the injector would enable these tests in ESA (+ in general an RF gun would add significant capability to ESA program, providing significantly smaller transverse and longitudinal emittances) M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 19

Detector Development KPi. X readout chip is being developed at SLAC for Si. D Detector Development KPi. X readout chip is being developed at SLAC for Si. D concept. • 1000 -channel ASIC design to read out entire Si wafer or pixel detector • Si-W ECal, Si Outer Tracker, GEM HCal, (Muons? ) • 32 x 32=1024 channels; currently a 2 x 32 prototype • Pulsed-power operation delivers 20μW/channel average with ILC timing 2007 beam test used 3 planes of Si (50 mm width) mstrip sensors (spare from CDF Layer 00) ESA beamline setup KPi. X Local DAQ board w/ FPGA; fiber bundle to detector, and USB to local PC w/ ethernet Future development & tests needed: • bump bonding • 1000 channels • sensor resolution • KPi. X on new sensors M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 20

Other Recent Experiments Detector Tests: • T-469 (ESA 2006 -7): Focusing DIRC for particle Other Recent Experiments Detector Tests: • T-469 (ESA 2006 -7): Focusing DIRC for particle ID, and very precise TOF detectors aimed at 10 ps timing resolution (motivated by Super-B) Radiation Physics and Materials Damage Tests: • T-489 (ESA 2007) – activation and residual dose rates of materials compare with MARS and FLUKA simulation codes • T-493 (ESA 2007) – LCLS undulator beam-induced demagnetization studies Particle Astrophysics Detectors and Techniques: • GLAST (ESA 2000) – LAT Tower (anti-coincidence detector, silicon tracker and calorimeter) calibration and system integration using secondary positrons, hadrons and tagged photons • FLASH experiment (2002 -2004 in FFTB) measured fluorescence yields in electromagnetic showers to help calibrate air shower detectors for ultra-high energy cosmic rays (used primary beam) • Askaryan effect (FFTB 2002): demonstrated a radio Cherenkov signal from Askaryan effect for detectors proposed to detect ultra-high energy neutrinos; used primary electron beam • ANITA (ESA 2006): calibrated the entire balloon flight array and made the first observation of the Askaryan effect in ice; used primary electron beam M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 21

T-489 Activation Experiment (CERN, SLAC collaboration) Setup Analysis Ø gamma spectroscopy for many isotopes T-489 Activation Experiment (CERN, SLAC collaboration) Setup Analysis Ø gamma spectroscopy for many isotopes Ø residual dose rates versus time Ø tritium activity M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 22

Future Activation and Materials Damage Studies • test different target materials • test different Future Activation and Materials Damage Studies • test different target materials • test different geometry configurations • instrumentation tests and calibration • radiation hardness for electronics and materials Ø broad interest for these studies in high radiation environments at different accelerators Ø needed for both accelerator and detector components M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 23

FACET-ESA Facility Operational Modes & Beam Parameters Operational Modes: • ESA operation simultaneous with FACET-ESA Facility Operational Modes & Beam Parameters Operational Modes: • ESA operation simultaneous with ASF using pulsed magnets • ESA access and experimental setup while ASF in operation • ASF access prevents beam to ESA, but can access ASF for experimental setup during day and run ESA beam at night Beam Parameters: • Primary Beam for Accelerator Science, Beam Instrumentation and Beam Dump experiments • Secondary electrons and hadrons for Detector R&D M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 24

Primary Beam Parameters to SLAC ESA Parameter “PEP-II” operation FACET Proposal 10 Hz 10 Primary Beam Parameters to SLAC ESA Parameter “PEP-II” operation FACET Proposal 10 Hz 10 -30 Hz Energy 28. 5 Ge. V 12 Ge. V* Bunch Charge 2. 0 x 1010 up to 3. 5 x 1010 (single bunch), up to 5 x 1011 (400 ns bunch train) Bunch Length 300 -1000 mm (1 -5) mm Energy Spread 0. 2% 0. 4% 300, 15 150, 15 0 (<10 mm) Repetition Rate gex, gey (mm-mrad) Dispersion (h and h’) *24 Ge. V possible with later upgrade, moving extraction point to Sector 18 M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 25

Secondary Electrons Ø Electron rates from single particle up to 105 per pulse Ø Secondary Electrons Ø Electron rates from single particle up to 105 per pulse Ø 2 -10 Ge. V momentum range Ø precise (0. 1%) momentum analysis using A-line as a spectrometer Ø rms spotsize in ESA ~3 mm Production: insert a valve in EBL for a low intensity beam of ~109. Insertable valve Other possibilities: i) higher intensities of 12 Ge. V electrons: collimate a low intensity, large energy spread beam with A-line momentum slits (cover range from ~106 up to full intensity) ii) set A-line to accept positrons. (may be possible to design PPS M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 26 to allow ESA occupancy during beam on operation? )

A-Line Hadron Production Facility Be Target: 0. 43 r. l; 1. 5 -deg production A-Line Hadron Production Facility Be Target: 0. 43 r. l; 1. 5 -deg production angle PC 28: 6 msr geometric acceptance C 37: up to 11% momentum acceptance; adjustable Q 38: corrects dispersion at detector in ESA Q 29, Q 30: control spotsize in ESA (ongoing studies indicate need for additional 2 quads in ESA; use Q 29, Q 30 for waist at C 37). Expect to achieve ~1 cm rms spotsize at detector location in ESA M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 27

Secondary Hadron Yields Measured and predicted (curves) particle fluxes of secondary beams from SLAC Secondary Hadron Yields Measured and predicted (curves) particle fluxes of secondary beams from SLAC Report 160. (pulse length is 1. 6 ms, so 1 m. A corresponds to 1010 electrons/pulse) SLAC-R-160 FACET-ESA Beam Energy 19. 5 Ge. V 12 Ge. V Production Target 0. 87 r. l. Be 0. 43 r. l. Be Production Angle 1. 5 deg Acceptance 30 msr, 4% Dp/p 6 msr, 11% Dp/p M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 28

Secondary Hadron Yields Measured and predicted (curves) particle fluxes of secondary beams from SLAC Secondary Hadron Yields Measured and predicted (curves) particle fluxes of secondary beams from SLAC Report 160. (pulse length is 1. 6 ms, so 1 m. A corresponds to 1010 electrons/pulse) SLAC-R-160 FACET-ESA Beam Energy 19. 5 Ge. V 12 Ge. V Production Target 0. 87 r. l. Be 0. 43 r. l. Be Production Angle 1. 5 deg Acceptance 30 msr, 4% Dp/p 6 msr, 11% Dp/p → expect rates up to ~10 pions/pulse per 1010 electrons on target → rates for kaons and protons x 10 -50 less M. Woods, SLAC 3. 7 6 8 10 Naïve scaling for FACET DOE FACET Review, Feb. 19, 2008 should be reduced by ~x 2. 5) (+ yields 29

ESA Science Program starting in 2011 1. Linear Colliders, Accelerator Science & Beam Instrumentation ESA Science Program starting in 2011 1. Linear Colliders, Accelerator Science & Beam Instrumentation Ø primary beam experiments Ø need to evaluate both cold (ILC) and warm (ex. CLIC) linear colliders; ex. demonstrate beam instrumentation capabilities to resolve beam parameter time dependence along a 200 -300 ns train Experiments • BPMs + other typical accelerator instrumentation such as toroids • MDI components and instrumentation: energy spectrometers, polarimeters, forward region detectors, luminosity detectors, beam halo detectors • tests requiring large amount of space: mockups of IR components, long baseline BPM or quad tests for vibration and stability studies • tests that don’t require ultra-small or ultra-short beams M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 30

Comparing Beam Parameters for FACET-ESA and Linear Colliders Parameter ILC (cold) X-band (warm) CLIC Comparing Beam Parameters for FACET-ESA and Linear Colliders Parameter ILC (cold) X-band (warm) CLIC (warm) FACET Proposal 5 Hz 120 Hz 10 -30 Hz Energy 250 Ge. V 12 Ge. V* Bunch Charge 2. 0 x 1010 0. 75 x 1010 0. 37 x 1010 (0. 2 – 2. 0) x 1010 rms Bunch Length 300 mm 110 mm 30 mm 1000 mm rms Energy Spread 0. 1% 0. 2% 0. 35% 0. 4% Bunches/Train 2670 192 312 1 (up to 1200**) Bunch spacing 300 ns 2. 8 ns 0. 5 ns - (0. 3 ns**) 1 ms 300 ns 150 ns - (up to 400 ns**) Repetition Rate Train length *24 Ge. V possible with later upgrade, moving extraction point to Sector 18 ** long pulse operation can give 400 -ns train with 0. 3 ns bunch spacing and total charge up to 5 x 1011 (other bunch spacings may also be possible) Ø only place in the world to do this! M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 31

ESA Science Program starting in 2011 2. Advanced Detector R&D with secondary electrons and ESA Science Program starting in 2011 2. Advanced Detector R&D with secondary electrons and hadrons • Linear Colliders, LHC detectors, Super-B, … • large scale mockups and integration tests possible Ø precise momentum definition for electrons Ø precise timing Ø multiple particles coincident in time, and high-density electron rates possible 3. Activation, Residual Dose Rates and Materials Damage Studies • additional data needed for accelerator and detector components at linear colliders, LHC and light sources • data needed to tune and validate simulation codes such as MARS and FLUKA • data needed for environmental impact in high radiation environments 4. Tests for Particle Astrophysics Detectors and Techniques • calibrating instruments and testing new detector concepts with test beams will continue to be essential for experiments in high energy particle astrophysics The FACET-ESA facility will attract and service a wide range of users! M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 32

Summary of ILC Detector R&D Test Beam Needs (from “Roadmap for ILC Detector R&D Summary of ILC Detector R&D Test Beam Needs (from “Roadmap for ILC Detector R&D Test Beams” document) + significant test beam needs for LHC upgrade, Super-B if it proceeds, … v CERN and Fermilab have the most capability for energy range and particle species v FACET-ESA at SLAC can provide an important additional U. S. facility M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 33

CERN PS/SPS Test Beams C. Rembser, CERN SPS: 4 Test Beamlines 2007: Beam time CERN PS/SPS Test Beams C. Rembser, CERN SPS: 4 Test Beamlines 2007: Beam time requests from 47 groups, O(1500) users SPS test beams: 23. 5 weeks requested PS test beams: 28 weeks requested • ~52% LHC & LHC upgrade • ~43% LHC & LHC upgrade • ~35% external users M. • ~12% external users Woods, SLAC DOE FACET Review, Feb. 19, 2008 34

LHC Test Beam Experience (from P. Schacht at IDTB 2007 Workshop) Typically 3 phases LHC Test Beam Experience (from P. Schacht at IDTB 2007 Workshop) Typically 3 phases of testbeam activities: • prototype tests • quality control + validation of performance requirements • full calibration of final calorimeter; wedge tests Ø Phase 2 hardware (read-out electronics, cabling, calibration) and software (reconstruction algorithms, calibration modes) should be close as possible to final Ø Phase 3 hardware and software have to be final versions Ø Transition regions – cracks between calorimeters, dead material, etc. – important: • optimize correction procedures, validate MC geometry + hadronic shower models ATLAS wedge test M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 35

Fermilab M-Test Beamline (from E. Ramberg at IDTB 2007 Workshop) Energy (Ge. V) Estimated Fermilab M-Test Beamline (from E. Ramberg at IDTB 2007 Workshop) Energy (Ge. V) Estimated Rate in New Design (dp/p 2%) 1 --- ~1500 2 --- ~50 K 4 ~700 ~200 K 8 ~5 K ~1. 5 M 16 ~6 m Present Hadron Rate MT 6 SC 2 per 1 E 12 Protons ~20 K ~4 M Plans for CALICE Setup Tail Catcher HCAL ECAL M. Woods, SLAC Electronic Racks Spill structure • one (1 -4)s spill every 2 minutes • possibility for 1 ms “pings” at 5 Hz during spill • 3 MHz bunch structure possible Beam DOE FACET Review, Feb. 19, 2008 36

ESA capabilities for Detector Beam Tests ESA strength ESA satisfies many of the desired ESA capabilities for Detector Beam Tests ESA strength ESA satisfies many of the desired capabilities for a test beam facility M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 37

Summary FACET provides unique capabilities w/ a high energy, high intensity electron beam ESA Summary FACET provides unique capabilities w/ a high energy, high intensity electron beam ESA provides a large flexible facility with excellent infrastructure to accommodate a wide range of experiments: • accelerator science and beam instrumentation tests that do not require spotsizes below 100 microns or bunch lengths below 1 mm • advanced detector R&D with high quality secondary electron beams and a general purpose pion beam; good applicability for a linear collider, for LHC upgrades or for Super-B • beam dump experiments for activation, dose rate and materials damage studies • detector R&D for high energy astrophysics instruments • variable flux of electrons available from single particles to moderate intensities for high rate detectors (ex. very forward Beam. CAL detectors at a linear collider) to full primary beam power v Inclusion of ESA in the FACET proposal broadens the science capabilities. • interleaved experiments in 2 facilities improve efficiency and cost effectiveness • choice to do experiments in ASF or ESA FACET can build on a long, rich history of successful test beam and small experiments in End Station A. M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 38

Additional Material M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 39 Additional Material M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 39

Transverse Beam Emittance to ESA no radiation (chromatic) input level (from DR) At 12 Transverse Beam Emittance to ESA no radiation (chromatic) input level (from DR) At 12 Ge. V, expect gex = 150 mm-mrad gey = 15 mm-mrad M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 40

Longitudinal Emittance to ESA Li. Track simulation results for bunch length and energy spread: Longitudinal Emittance to ESA Li. Track simulation results for bunch length and energy spread: rms Bunch Length (mm) rms Energy Spread (%) Ne = 0. 75∙ 1010 E = 12 Ge. V Large R 56 (=0. 465 m) for A-line and relatively large energy spread at low energy result in large bunch lengths in ESA. M. Woods, SLAC DOE FACET Review, Feb. 19, 2008 41