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Abstract

Abstract. NSLS-II Performance and Magnet Lattice S. Krinsky, NSLS-II Project

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Abstract

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  1. Abstract NSLS-II Performance and Magnet Lattice S. Krinsky, NSLS-II Project In this presentation, we introduce the NSLS-II storage ring magnet lattice and review the basic machine performance parameters. In particular, we discuss the requirements on dynamic aperture necessary to achieve acceptable injection efficiency and Touschek lifetime. The tight specifications on the harmonic content of the magnetic fields in the NSLS-II multipole magnets have been set to assure sufficient dynamic aperture not only for the bare NSLS-II lattice but also to leave room in the nonlinearity budget for the installation of 27 or more insertion devices to serve as the sources for the user research programs. *Work performed under auspices of the United States Department of Energy, under contract DE-AC02-98CH10886

  2. NSLS-II Performance and Magnet Lattice Samuel Krinsky NSLS-II Accelerator Physics Group Leader NSLS-II Magnet Production Workshop April 11-12, 2012

  3. Some Basic NSLS-II Project Goals

  4. Technical Requirements & Specifications

  5. Injection System Local Control Room Equipment Racks for Linac and LTB line Klystron Gallery Linac Tunnel

  6. Storage Ring

  7. Storage Ring Cell Configuration C F C C F C C C F 3-pole wiggler • 10 quadrupole magnets per cell, independent power supplies (initially 4 quads in the matching section) • 9 sextupole families, 3 chromatic and 6 geometric. (initially 12 sextupole families) • 2 slow correctors and 2 BPMs per girder to allow girder by girder orbit correction • 2 additional high stability BPMs in each straight section to improve stability • 3 fast correctors per cell for fast orbit correction • most of the magnet to magnet separation is standardized to 17.5 cm. • (straights increased from 5/8 to 6.6/9.3) • 3-pole wiggler was added to the lattice to provide dipole radiation F

  8. Lattice Functions for One Cell

  9. Reduction of Emittance with Damping Wigglers Baseline design has three damping wigglers: L=7m, B=1.8T

  10. SR Lattice & Electron Beam Sizes/Divergences Lattice Functions Most challenging Beam stability Requirements = ~ 0.31 μm Electron Beam Sizes & Divergences

  11. SR BPMs and Correctors 2 1 BPMs 2 3 1 3 4 6 5 SC SC FC FC SC FC SC • Slow correctors (Qty=6) • Slow response – 2 Hz • Strong strength – 800 μrad • Utilized for – • Alignment • Slow orbit feedback SC SC • Fast correctors (Qty=3) • Fast response – 2 kHz • Weak strength – 15 μrad • Utilized for – • Fast orbit feedback 156 mm slow 100 mm slow 30 mm fast (air core)

  12. Touschek Scattering Energy acceptance is smaller if electron is scattered at high dispersion Scattering rate is smaller for high dispersion, since bunch volume bigger Touschek Lifetime σs=15ps w/o Landau Cavity

  13. Requirements on Dynamic Aperture • Injection: we need to maintain particles with initial displacement of • about 11mm. We therefore look for solutions with calculated • on-momentum dynamic aperture of >15mm (including IDs and errors) • Touschek lifetime: we require the Touschek lifetime to be >3hrs • with Landau cavity. Therefore, our goal is to achieve a calculated energy • acceptance of +/-2.5% for scattering at low dispersion and +/- 2.0 % • for scattering at high dispersion. This will provide sufficient margin to • allow for effects not included in the tracking simulations.

  14. Introduction of Third Chromatic Sextupole Knob Allows reduction of second order horizontal chromaticity while maintaining flexibility in Geometric sextupoles to correct the tune-shift with amplitude. --moved one of the defocusing chromatic sextupoles toward max dispersion

  15. NSLS-II Beamlines Underway • BeamlineConstructionProjects SE TE • NSLS-II Project Beamlines • Inelastic X-ray Scattering (IXS) 1 1 • Hard X-ray Nanoprobe (HXN) 1 1 • Coherent Hard X-ray Scattering (CHX) 1 1 • Coherent Soft X-ray Scat & Pol (CSX) 2 2 • Sub-micron Res X-ray Spec (SRX) 1 1 • X-ray Powder Diffraction (XPD) 1 1 • NEXT MIE Beamlines • Photoemission-Microscopy Facility (ESM) 2 3 • Full-field X-ray Imaging (FXI) 1 1 • In-Situ & Resonant X-Ray Studies (ISR) 1 2 • Inner Shell Spectroscopy (ISS) 1 1 • Soft Inelastic X-ray Scattering (SIX) 1 1 • Soft Matter Interfaces (SMI) 1 2 • ABBIX Beamlines • Frontier Macromolecular Cryst (FMX) 1 1 • Flexible Access Macromolecular Cryst (AMX) 1 1 • X-ray Scattering for Biology (LIX) 1 1 • Type II Beamlines • Spectroscopy Soft and Tender (NIST) 2 6 • Beamlinefor Materials Measurements (NIST) 1 1 • MicrodiffractionBeamline (NYSBC) 1 1 • TOTAL 21 28 18 Beamline Construction Projects Underway 21 Simultaneous Endstations (SE) 28 Total Endstations (TE) Beamlines with design and construction underway 22 additional beamlines (25 SE) have been proposed by the user community and approved by the SAC and NSLS-II but are not yet funded

  16. NSLS-II,NEXT, and ABBIXInsertion Devices † For canted IDs/FEs, ( ) shows canting angle in mrad * Depending on location within ID straight section ** Off-center canting magnet location in ID straight section PPM: Pure Permanent Magnet EM: Electro Magnet H: Hybrid Magnetic Design

  17. ID Field Error Comparison • 1st & 2nd • Integrals Cf. 1000 G.cm.cm corresponds to 1 micron in displacement at NSLS-II

  18. Commissioning Schedule

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