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Accelerator Systems Overview

Accelerator Systems Overview. F. Willeke, Director, Accelerator Systems Division 5 th NSLS-II ASAC March 26-27, 2009. Outline. Charge Response to last meeting Overview of Technical Progress Accelerator Physics Injector Magnets Girders and Alignment Frontend and Utilities Vacuum RF

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Accelerator Systems Overview

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  1. Accelerator Systems Overview F. Willeke, Director, Accelerator Systems Division 5th NSLS-II ASAC March 26-27, 2009

  2. Outline Charge Response to last meeting Overview of Technical Progress Accelerator Physics Injector Magnets Girders and Alignment Frontend and Utilities Vacuum RF Instrumentation Controls Insertion Devices Organizational Development Staffing Organization and Group Structure Procurement Plans

  3. Overall AS Status • Focus 2008: • Finalize AS Designs which require strong coordination with building design • Major milestones achieved since last ASAC: • CD-3 Approval Jan. 9, 2009; • Ring Building contract awarded; • Site clearing activities completed, • Preparatory Construction Work started. • Designs being completed in several key areas (girder, magnets, vacuum chambers) • significant progress in prototyping & testing (Magnets) • 2009Project Funding granted as planned ($103M) • Project expects to receive early funding •  Focus 2009: the ramp-up of procurements

  4. Charge • Focus on recent progress major subsystems with near-future procurement activities to offer a last chance to receive comments • Focus subsystems which were not extensively covered in previous meetings. • Specifically: • Review results on DA studies incl. the effect of ID assessment on proposed improvement of non-linear and chromatic correction system •   Review progress on design of the injector system and comment on procurement plans for major components in the near future •   Review results of SR magnet prototype program with respect to readiness to start the production soon •   Review progress of the vacuum system; in particular the shielded bellow design & mitigation of beam heating issues •   Review the superconducting cavity designs and procurement strategies for the RF systems • Review the development of the control system, definition of interfaces between controls and technical subsystems. •   Review the major procurement plans, procurement strategies, assumptions made for the procurement schedule. • The Committee kindly requested to formulate responses in a written report expected to by 4-30-09.

  5. AGENDA

  6. Response to Recommendations Last Meeting • Comment on Staged Procurements: Project Default is phase funded procurements but funding situation has developed such that major ASD procurements can be fully committed • Comments on LINAC procured too late: Funding limitations removed, beneficial occupancy of injector advanced by 6 months, funding available  pull forward LINAC procurement in FY09 together with frontend • LINAC Parameters within reach of Standard Technology, no frontend studies: 15nC/150ns routinely not commercially available • Focus on D.A with ID: Being done, but make only sense if NL lattice optimization sufficiently matured • Decker Distortions Necessary?: They are not in the baseline, will be part of the beam lines in the when fully build-out all beam lines, will probably implement one up-front and get experience • Effort to be made on XBPM: Recent workshop (organized by EFD) • Staffing to be increased in ID, Diagnostics and RF: $5M (~30 FTE) in Labor budget added in September • High Field Quality Necessary: NSLS-II strongly Touschek limited because of low emittance, high intensity and high intensity=New Regime, mechanism for DA reduction from high multipoles well understoodneed high field quality in center quads and sextupoles • Tracking with Engineering Tolerances and Non-systematic errors : Being Done

  7. Response to Recommendations Last Meeting Variable Gap DW to control Emittance: Very expensive way to control beam size; because of DW, impact of ID relatively small: 400kW@25 devicesDPrad~8% Ds=4% Individually Controlled Sextupoles Everywhere: Benefit/cost ratio not obviously optimum, Could still be added any time by adding funds to PS and cabling Include RF into Booster Turn key: Vendors not interested Force Standardization of Equipment on Turn-key Vendors: Desirable, subject to negotiations the contracts, will eventually cost more money, needs to be seen High Field Quality too demanding, measurable?: Required Field quality can be met by vendors and can be measured, field quality was relaxed where D.A. allows, high order multipole in large aperture magnet measured with 30mm radius coil Flat Segments in Pole profile: Decided against to not compromise field quality Corrector Results: Available, meet requirement but concepts has been changed, not presented Building Vibrations Transferred to Tunnel: State of the art modeling says it is no problem

  8. Vacuum Damage by Beam During Commissioning: High Intensity operation only after beam optics/orbit under control and safety systems tested, diagnostic works with single bunch, and at least down to 20% of design intensity : factor 5000 in Beam power, ID’s not installed, later gaps open initially, SR power from bending in commissioning: 0.5W ok for conflat flanges Boil-off N2 necessary: Changed to air, more expensive initially but will safe on the long run Sequence of Ring B.O. of Building Parts: Sequence changed in favor of early availability of RF and Injector buildings Dirty DI Water initially, filters: plan to purge all piping before connecting to components, filters good idea Availability: Availability Study done, 95% requires already MTBF above standard values for typical accelerator components

  9. Accelerator Physics • Dynamic Aperture so far still in the focus (WM Guo’s, J. Bengtson’s presentations) • Relaxation of field specifications of quadrupoles and sextupoles assed • Dipole magnet field specification revisited • Usefulness of a 3rd chromatic know acknowledged: Alternatives for implementation: • - Use one of the Geometric sextupoles inside achromat or • - move one chromatic sextupole inside achromat • - decision pending, will use window of opportunity • Good progress in integration of damping wigglers • Progress in integration of IVU’s into the lattice (up to 10) : So Far not issue • EPU studies started • Lattice refinement, tolerance and flexibility studies continued • (longitudinal position, magnetic lengths, ps stability, working point flexibility, • TOP-OFF studies continued, need to take up speed again • Impedance assessment concentrated on vacuum chamber rogue-modes and BPM heating recently • FAST Ion and e-cloud instabilities assessed, do not represent a threat • Transverse Feedback Design Started • Fast Orbit Feedback and Corrector Layout re-optimized for Separated Function Correctors

  10. Fast Orbit Correction Task Force • Kick-off Fast orbit feedback Taskforce headed by • Recent Results: measurements of the transfer function of the improved 156mm corrector with a shielded bellow (APS design) in the magnet gap baseline solution of fast corrector satisfies requirements for NSLS-II However: Each fast corrector will see different eddy current environment , will behave differently Corrector PS design represents considerable challenge  Taskforce to explore alternatives:

  11. Injector • Large Efforts to clarify interfaces and define details of injector building: detailed layout of equipment rooms, tunnel wall penetrations, labyrinths etc, cable conduits etc…. confident that Injector building providing completely for injector needs • Injector Linac specification and procurement documents nearly completed LINAC turn-key procurement: one staged procurement (funds available) 4 interested vendors • Booster design refined, improved lattice Booster procurement documents drafted Booster RF cavities on site, adaption to NSLS-II needs in progress ( RF, J. Rose) Plan and cost estimate for in-house integration of booster developed for purpose of reference and fall back • Beam line designs iterated with building design refinements • Injection scheme about to be changed from 4-kicker bump to sextupole injection Details: T. Shaftan’s Presentation

  12. Storage Ring Magnets • Prototypes production by 3 manufacturers completed • Measurement and test program almost completed, NSLS-II Specs can be met, in some areas some relaxation of non-allowed harmonic specifications • Construction readiness review completed and final Design Refinements completed • Procurement Documents and Drawing packages completed • Magnets will be built to Specifications (deviating from previous plans) • Procurement awaiting DOE Approval for Go-Ahead • Plan to submit request for proposals within 2 weeks • Contract award planned for August 15 (back to original schedule) • Details J. Skaritka’s Presentation

  13. Girder, and Alignment • Girder and Alignment R&D completed, original procedures refined and revised  • Quadrupoles and Sextupole magnets can be aligned routinely on Girders with 30mm precision using vibrating wire technique and motorized magnet movers and manual fixation • Girder surface can be recorded to 5mm precision using inclinometers and laser trackers • Girders can be moved to the tunnel and the high precision alignment can be restored by restoring girder surface using inclinometers and laser trackers • Girders in the tunnel can be bolted to the tunnel floor magnet position preserving the magnet alignment within 30 mm. • Girders in the tunnel will have no resonant mechanical vibration modes below 30Hz • Girder thermal expansion hysteresis will be < 5mm @ DT= 1ºC • described in a detailed step-by-step procedure, each step has been demonstrated

  14. Girder R&D: Behavior under Temperature Changes Temperature Cycling and Reproducibility Tests Result: Reproducibility after 1 °C Temperature Change : ~0.5 mm

  15. Beam Line Front Ends Beam Line Front-Ends designed ahead of time Ray-tracing and thermal analysis performed • All components have been modeled. Detailed drawings are in progress. • XBPMs and slits (if any) are to be designed

  16. Process Water System Process water s designs well advanced

  17. Diagnostic Systems • RF Button Redesigned to optimize the sensitivity (requires new vacuum chamber cross section) • Button heating suppressed by optimization of Geometry • High Stability BPM Stand iterated  new concept based on Invar • Noise Performance of commercial electronics tested and found to meet NSLS-II requirements • Fast Orbit Correction Feedback re-assessed New concept based on separated function correctors • Photon BPM Workshop held in March (organized by EFD)

  18. Diagnostic Overview * IPR 2007 recommendation

  19. RF Button Redesign 16 mm • Sensitivities (/mm) • Sx =~ 0.09; Sy =~ 0.09 (OK) • Electronic Resolution • (0.017 – 200 Hz BW) • H-Resolution =~ 135 nm • V-Resolution =~ 135 nm • Required =~ 200 nm the crucial dimension: need enough material to get helicoil length for seal clamping force BPM flange with 2 buttons - Configuration requiring one large hole In multipole chamber – Simplifies installation and survey

  20. RF Button Heating New design incorporates a Boron Nitride heat sinking washer on the ambient side of the glass seal. Heat flux of 8 watts per button worst case, 25% of the total heat load was applied to the button, 75% was applied to the stainless body directly outside the button perimeter, mating surface of the stainless held at 25 ºC temperature maximum value of 109 ºC. Washer Seal

  21. First Results from Libera Tests – Meet Drift Specification Igor Pinayev HOR ~ 200 nm HOR 50 Hrs VERT ~ 150 nm VERT TEMP ~ 1 oC TEMP • Power level 6 dBm (0 dBm at each input) • 80% fill (2 μs pulse duration with 2.62 μs pulse repetition rate) • Total drift 200 nm; Temperature Drift 100 nm /°C

  22. New Concept, Prototyping and Tests of the High Stability BPM Stand

  23. Vacuum Systems • Extruded Al Vacuum chamber design well advanced • Extrusion-, machining-, welding-tests successful, Prototype chamber built and tested • Chamber profile revised to accommodate improved BPM antennas new prototyping • Procurement for vacuum chamber has started • NEG pumps prototype produced, installed & tested • In-situ heating of chamber tested, meets requirements • Dipole chamber bending tests successful • Shielded Bellow design well progressed • Vacuum laboratory assembled, ozon cleaning apparatus installed • Vacuum assembly facility delayed •  Details: Hsiao Chaun Hseuh’s presentation

  24. Technical Progress: RF Storage Ring RF: CESR-B or KEK-B single cell 500 MHz sc. cavity Three possible vendors for turn-key cavity module CESR-B Cavity and Cryostat need design improvements to comply with FR 851; redesign effort started in collaboration with industry Turn-key RF transmitter system defined and specified; Klystron or IOT LLRF system FPGA based control module, designed, prototype fabricated, tests performed; 2nd prototype  (HJ Ma’s presentation) Extensive LLRF modeling in progress, optimize control algorithm to satisfy high demands on RF phase stability of 0.5 ° NSLS-II Landau cavity design, copper module built, measurements in progr. Cryogenic plant preliminary design completed  See J. Rose’s presentation LBL Collab.

  25. PS System • Design of power supplies for the main dipole and quadrupole, sextupole, and corrector magnet in progress • Prototyping of Fast Corrector Supply • Tested • Alternative 2 channel DC corrector+ • Independent fast corr. Supply developed • Equipment Enclosures Prototypes being tested • Detailed layout of cable system including cable conduits / penetrations from mezzanine into tunnel, cable trays, AC distribution

  26. Layout of equipment on tunnel mezzanine Detailed 3-D CAD models of PS equipment inside the racks and Rack Layout on Mezzanine (tunnel roof) incl. cable trays, cable conduits, AC distribution

  27. Insertion Devices • Design Contract for Damping Wiggler about to be placed • Magnetic Design of DW, IVU, EPU completed • Build out of Insertion Device Laboratory started • Staffing Situation slowly improving: • Insertion Device group has now 1 ½ Scientist+ 0.5FTE MOU Scientists from Magnet Division from 1 Mechanical Engineer, 1 Electrical Engineer • Scope of Project Insertion Devices is changing: • -Only one DW Beam line with a 2 x 3.5m device • -Need to develop IVU optimized for large beta straight • -Specialized IVU for ISX beam line to be developed IVU EPU 3PW

  28. Control System Efforts concentrated on three areas: Controls Architecture Development development is the embedded device controller - standard EPICS and control system studio a collaborative set of operator applications being developed at DESY and SNS. Relational Database Development Development/formatting of configuration tools, scripting tools, web-based reports and machine files High Level Application Platform online model running tracy 2 is operational with a lattice derived from an elegant desk As it runs under EPICS all of the channel access clients work on it including the XAL tools and the matlab middle layer toolkit and SDDS for that matter. open-source protocol (DDS)is examined whether suitable for the high level application architecture.  L Dalesio’s Presentation Device Controller Board Prototype

  29. ASD Procurement in FY09

  30. Staffing • ASD 90 Staff & ~ 10FTE MOU & 3 FTE Temporary Staff • Some key Staff still not on board, but hiring process is converging  Tight coordination with NSLS-II HR support • Labor Budget increased by 5M$ (@~30FTE) in September (injector, mechanical engineering) • Certain Areas still too lightly staffed: design room, survey, mechanical engineering electrical engineering @30FTE • Staffing Concerns: Steep increase of temporary labor in FY11 and FY12 • Rapid decrease of project funding after 2012 • So far early operation to support commissioning not supported

  31. Staffing

  32. ASD is moving from the design in the construction phase • Design of key components is completed or sufficiently advanced to begin procurement • Design optimization continues wherever there this is not in conflict with the schedule of components • Storage Ring Magnet Program is proceeding well, prototype program successfully completed, Bid opening within the coming few weeks, contracts to be placed in August • Technical challenges of support systems in meeting the tight alignment and stability tolerances • Successfully completed, girder integration prepared • Vacuum systems design well advanced, pre-production started, mass production will start in this FY. • LINAC procurement in progress, plan to award contract in October • ASD Organization and Management developing • Staff almost complete • Labor resources tight, ASD falling behind schedule in labor intense areas (~20FTE accumulated resources missing) • Project received funds ahead of time, prioritization of work and procurement pulled forward in progress Conclusions

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