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ATF2 Layout/Optics (v3.7)

ATF2 Layout/Optics (v3.7). Coupling Correction / Emittance Diagnostics. FONT. nBPM (KEK). nBPM (SLAC). Compton / laserwire. Existing ATF Extraction Line. ODR. (v3.7). Version 3.7 Changes. remove EXT sextupoles remove FF octupoles and decapoles

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ATF2 Layout/Optics (v3.7)

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  1. ATF2 Layout/Optics (v3.7) Coupling Correction / Emittance Diagnostics FONT nBPM (KEK) nBPM (SLAC) Compton / laserwire Existing ATF Extraction Line ODR July 18,2007

  2. (v3.7) July 18,2007

  3. Version 3.7 Changes • remove EXT sextupoles • remove FF octupoles and decapoles • 2 new IDX skew quadrupoles in EXT for vertical dispersion correction (Okugi-san’s locations) • final magnet designs selected; use correct effective lengths, bores, gaps, etc. • all diagnostic and correction devices (that I know of) now in MAD decks • more QBPMs added in EXT … total for ATF2 is now 34 • “standard” installation for all BPMs is on downstream end of magnet … as discussed and agreed at the SLAC-ATF2 meeting last March (there are some exceptions) • nomenclature for FF devices updated • “FF” appended to device names • as Kuroda-san suggested, “QD10” quads become “QD10BFF” and “QD10AFF” (also “QF9”, “QF5”, and “QD4”) • “QD2B” (a QF) and “QF3” (a QD) become “QF3FF” and “QD2BFF” respectively July 18,2007

  4. Tracking Results Program σy*(rms) σy*(sig) εyΔεy nm nm nm % -------- -------- -------- ------- ----- MAD 38.261 35.524 32.8839 9.6 ELEGANT 38.401 35.551 32.9674 9.9 TURTLE 36.292 34.791 31.6332 5.4 DIMAD 38.165 36.575 32.7121 9.0 LUCRETIA SAD • perfect machine • 10,000 particles (Gaussian distributions; 5σ) • sextupole component in SHI H-bends included • multipoles in SLAC epoxy kickers, QM7R.1, BS1X, QF1, and QD0 not included • no chromatic correction in EXT July 18,2007

  5. ATF2 Inflector (v3.7) K2 BH2 BH1 6.0 m BH1 K1 • BH1 (SHI “H”) strengths same as existing EXT • BH2 (SHI “C”) has 110% of present strength July 18,2007

  6. FF: IP Area IP configuration Monitors : 3 beam size monitors 2 C-band BPMs 1 Screen Monitor 1 ICT 1 IP-BPM S-band BPM Sweeping Magnet Carbon Wire C-band BPM Shintake Monitor Area Screen Monitor Honda Monitor C-band BPM ICT 180 135 120 100 100 100 180 135 180 100 150 180 550 155 QD0 Dump Bend C-band ref 350 200 390 540 605 105 150 547.5 705 IP-BPM 705 from Okugi-san’s 4th ATF2 Project Meeting talk IP Honda Monitor ; Moving Stage 350 nm – 1 micron ( -540mm from IP) ( Beam Vibration ) Shintake Monitor ; Sweeping Magnet < 350 nm ( at IP ) Phase Scan Carbon Wire ; Moving Stage ( micron level ) > 1 micron ( +390mm from IP) Sweeping Magnet ( sub-micron level ) July 18,2007

  7. K1(+) K2(+) July 18,2007

  8. SQ SQ SQ SQ WS WS WS WS WS 0.42 0.86 0.86 3.82 3.76 2.55 1.24 1.27 0.85 0.85 1.27 2.20 1.26 3.82 – x – y 90° 90° 180° 90° 90° 90° 11° 18° 28° 29° 42° 43° 29° 29° 80.6 10.0 154.7 6.7 88.5 11.7 153.0 6.6 86.5 11.7 σ (μm) 7 < σx/σy < 23 July 18,2007

  9. July 18,2007

  10. July 18,2007

  11. July 18,2007

  12. 2nd order dispersion July 18,2007

  13. chromaticity (EXT) July 18,2007

  14. beam size (μm) Parameters energy = 1.3 GeV γεx = 5×10-6 m εx = 2×10-9 m γεy = 3×10-8 m εy = 1×10-11 m σz = 8 mm σδ = 0.08 % βx* = 4 mm βy* = 0.1 mm σx* = 2.828 μm σy* = 34 nm July 18,2007

  15. Pulse-to-Pulse Feedback • stabilize beam into Final Focus (especially at sextupoles) • 2 dipole correctors per plane (Final Doublet phase and IP phase) • 2 BPMs per plane (Final Doublet phase and IP phase) • correctors and BPMs should be as far downstream as possible • feedback BPMs should have no dispersion • cavity BPMs used for feedback must have movers • BPMs must have resolution ≤ spot size for sub-σ stabilization • requires sub-micron resolution for vertical BPM at IP phase • move nanoBPM setup to selected location (between QM14FF and QM13FF … it’s a tight fit) and use nBPM3 for feedback … or … • could we use the IPBPM test setup here instead? • use a stripline BPM for horizontal BPM at IP phase July 18,2007

  16. ZH ZV BPM IP IP phase FD phase IP phase FD phase QBPM7FF IP phase nBPM3 FD phase ZV1FF IP phase ZV11X QBPM9FF FD phase ML1FF IP phase ZH10X FD phase ZH1FF July 18,2007

  17. ZH BPM 1910.5 µm 7.9 µm ZV BPM 302.6 µm 0.4 µm July 18,2007

  18. Version 3.7 Parts List Issues • 2 new IDX skew quadrupoles (QS1X and QS2X) • 2 new 20 amp bipolar power supplies (QK1X and QK4X) • 4 new NKK CH horizontal dipole correctors (with 5(?) amp bipolar power supplies) • 2 new NKK CV vertical dipole correctors (with 5(?) amp bipolar power supplies) • QD14X running at 97% of max power supply current (see parts list … ) • FF matching quadrupoles (QM16FF – QM11FF): bipolar power supplies? • power supply for BDMP • Alexander Kalinin’s Feedforward/Feedback devices for EXT have not yet been incorporated into the MAD decks … should they be? can they coexist with FONT? • off-beamline components (detectors, gamma collimators, MONALISA, etc.) not included • also see comments and notes on each worksheet of the parts list … July 18,2007

  19. Version 3.7 Optics and Simulation Issues • OTR1X … interference with DR quadrupole QM8R.1? • nanoBPM setup … does it fit between QM14FF and QM13FF? (if not, move QM14FF upstream); can we use it for pulse-to-pulse feedback? • should there be a location reserved for ODR? • FONT kickers are not in the deck yet … need a design (30 cm striplines? FEATHER kickers? • Kalinin’s feedforward/feedback devices? • possible reduced (20-25%) gradient for extracted beam in QM7R.1: can’t match in EXT using only quadrupole strengths … change DR optics to compensate? • simulations with estimated multipole content of SLAC epoxy kickers, QM7R.1, BS1X, and shimmed QC3s • need “small spot” optics for LW1X (1 µm) operation • need to redo and expand full tuning simulations • MPS issues for commissioning? July 18,2007

  20. Release v3.7 Files (July 18, 2007) -------------------------------------------------------------------------------- ATF2_common.xsif : MAD input file (common definitions) EXT_v3.7.xsif : MAD input file (EXT line) FF_v3.7.xsif : MAD input file (Final Focus) inrays.mad : MAD input ray definitions (10000) for tracking ATF2_v3.7.mad : top level MAD command file ATF2_v3.7.save : MAD SAVE file (for conversion to other optics program inputs) ATF2_v3.7.saveline : MAD SAVELINE file (for conversion to other optics program inputs) -------------------------------------------------------------------------------- ATF2v3.7.ppt : v3.7 overview presentation (PowerPoint) ATF2v3.7.pdf : v3.7 overview presentation (pdf) ATF2DeviceListv3.7r0.xls : detailed parts list (Excel) ATF2v3.7Layout.ppt : scaled cartoons of specific locations (PowerPoint) ATF2v3.7Devices.txt : simple text file with device names, lengths, center positions, and nearby spaces ATF2v3.7Devices.fig : scrollable beamline schematic (Matlab figure file) MagnetPositions.txt : comparison of v3.7 magnet positions to their v3.6 positions -------------------------------------------------------------------------------- Version 3.7 Release Files July 18,2007

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