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NSLS-II Injector Status

NSLS-II Injector Status. T. Shaftan Injection System Group Leader NSLS-II Accelerator Systems Advisory Committee October 16-17, 2010. Outline. Injector design requirements Injector procurements Linac Booster Storage Ring injection straight section Pulsed magnet laboratory (PML)

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NSLS-II Injector Status

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  1. NSLS-II Injector Status T. Shaftan Injection System Group Leader NSLS-II Accelerator Systems Advisory Committee October 16-17, 2010

  2. Outline • Injector design requirements • Injector procurements • Linac • Booster • Storage Ring injection straight section • Pulsed magnet laboratory (PML) • Transport lines • Summary

  3. Injector Requirements • NSLS-II requires a reliable injector capable of filling and maintaining storage ring current. Top-off mode of injection is required • Repetition rate of 1 Hz (2 Hz) sufficient with multibunch injection: initial fill 00.5 A in 3 min

  4. NSLS-II accelerator milestones Bunch patterns • Storage ring schedule contain two milestones: • Goals for start-up operations: • Two RF cavities • 21 m of damping wigglers • Low current 50 mA • Emittance 1 nm rad • Stable orbit • Top-off • Mature facility performance: • Complete RF system • Full current 500 mA Ib T0 80%/20% t Ib T0 Bunch trains t + Ib T0 Camshaft t Ib T0 Uniform t

  5. NSLS-II injector Injection straight B-SR TL 3-GeV booster, C=158m 20 mA, 1 Hz, 40 nmrad 200-MeV linac 15 nC/160-300 ns, 0.5% e.s., 50 µmrad LB TL 4

  6. Ongoing injector procurements • Linac • Four proposals received • Contract awarded to Research Instrument (RI, Germany) • Booster • Three proposals received • Contract awarded to Budker Institute of nuclear physics (BINP, Russia) • RF transmitter contract has been awarded recently • Transport line magnets • 7 types in two contracts • Proposals are being evaluated • Injection straight pulsed magnets • Preparation of specification and SOW is in progress • 4 kickers and 1 septum magnets with PS, vacuum chambers, supports • Considering both in- and out-of-vacuum septa solutions for the proposal

  7. 200 MeV linac 90-keV gun 4th acc. structure 1st acc. structure triplet • Linac contract has been awarded in April 2010 to Research Instruments (Germany) • PDR took place in July 2010 • FDR is scheduled for October 19 • Beam dynamics analysis is nearing completion • Decision has been made to use Solid-State modulators • Accelerating sections and solenoid magnets are being manufactured • Linac Front-End will be delivered in April 2011 for performance verification; diagnostics station is in procurement phase bunchers solenoids Linac Front-End J. Rose

  8. Linac Beam Dynamics Phase Space prior to Final Buncher with Chopper included • Linac beam dynamics efforts in parallel with Vendor • Corroborate vendor results • Supplement vendor work • Obtain tolerances for the components • Installation of a short drift in the linac front end for installation of a chopper as a future upgrade. • Chopper will be used to: • Cut the head and tail of bunch train to provide sharp edges • Deflect certain bunches into an aperture to shave some of the charge to produce a more uniform charge/bunch in the train. RMS beam sizes along the linac R. Fliller, G. Wang

  9. Booster • 200  3000 MeV • 36 nm rad, 0.1% energy spread at 3 GeV • 4-fold combined-function FODO lattice with dispersion suppressors • 32 BD magnets • 28 BF magnets • 24 quads • 16 discrete sextupoles • 40 correctors • 36 BPMs • 4 straight sections: • RF • Injection • 1 septum, 4 kickers • Extraction • 4 bumpers, 1 kicker, 1 pulsed septum, 1 DC septum • Diagnostics section

  10. Booster • Booster Contract has been awarded to BINP in May 2010 • PDR held in the week of October 11 • BINP team is on site • Detailed lattice design is completed • Major components are designed • Long-lead procurements are on the way: steel, copper, PS parts, ceramic chambers • Contract on RF transmitter is awarded • Booster FDR will take place at end of January 2011 • First articles will be produced by May 2011 • BD, BF magnets • Girder • Kicker • Corrector, sextupole PS • Installation labor estimate and installation sequence are available Booster PDR document dipole quad Cable routing Corrector PS

  11. Beam stacking • 15 nC/160 ns from linac is a challenging requirement • Looking into ways of reducing this requirement • One way to reduce charge from linac in half is beam stacking • Linac generates two 7.5 nC bunch trains separated by 100 ms. First is stored in the booster until the second train is added. • Intensive simulations were carried out to ensure high injection efficiency • It is determined that more than 90% of two beams will be captured for subsequent acceleration to 3 GeV • Kicker requirements (15 mrad in 300 ns with raise/fall time of 100 ns) are quite challenging • Submitted to PR ST AB R. Fliller

  12. Injection Straight section vac. pump, absorber septum kicker • Injection straight section design is ongoing • Two options considered: in- and out-of-vacuum septa • Preliminary design of magnets, vacuum system is completed • Preliminary impedance analysis is completed • Injection Straight section review took place in Sept 2010 • Reviewers from ALS, Diamond, SLS, SLAC, APS, NSLS-II, SPRING-8 • Review report is coming in October • Procurement documents for 4 kickers and septum magnet are being prepared; potential bidders are identified • DC septum is a copy of the booster extraction septum and will be delivered by BINP • Contract award for Injection straight section pulsed magnets is February 2011 • Testing of the 1st article and final magnets at Pulsed Magnet lab DC septum M. Ferreira et al.

  13. DC/Slow ramping bump at injection straight fast bump DC/slow bump • To improve the fast bump stability and reproducibility, three DC/slow ramping correctors are used as a local bump to lower the fast bump kick strength. • The max. bump amplitude at the septum knife is 5mm to maintain the stored beam lifetime and to keep the injected beam away from the septum knife. • The DC/slow bumper strength is 2.5mrad. • The fast bumper strength reduces by a factor of 1/3. The corresponding error tolerance is 1.5 times bigger. *DCfs1: DC bump + fast bump (different fast bump amplitude) DCfs2: DC bump + fast bump (equal fast bump amplitude) G. Wang, F. Willeke

  14. Transport Line Status • Current focus is on the LtB since that will be the first installed. • Assembly area designated in Mechanical Equipment Room of Injector Service Building. • Transport Line Optics Designed • Magnet Vendor proposals are being evaluated • LtB Vacuum chamber design is underway • Some diagnostics are in house, other procurements are underway • Stands and support structures are being designed for LtB, similar stands will be used for BtS. • Supplemental shielding is being designed, locations are understood for LtB. Linac to Booster Transfer Line in the Linac Vault R. Fliller et al.

  15. Pulsed Magnet Lab Status • PML is developed to: • Test concepts of pulsed systems • Build prototypes of critical pulsed systems • Test procured devices • PML staff: • Senior scientist • Electrical engineer • Technician • Help from other NSLS-II/NSLS staff • Hiring experienced engineer • Working on today: • Prototyping booster extraction kicker • Developing concept of a single PS for all SR kickers • Testing high-voltage switches • Developing PML measurement and control systems • PML is getting ready to receive SR pulsed magnets for testing S. Kowalski, R. Heese

  16. Injector milestones

  17. Conclusions • Injector design is complete except for • Transport line vacuum chambers and supports (detailed design) • Detailed designs of the injection straight components • Number of new design features (booster beam stacking, DC/slow bump) has been implemented recently • Components are now in manufacturing stage • Linac and booster contracts are with capable vendors • Procurement of the injection straight section pulsed magnets is in preparation; Pulsed magnet laboratory is ready to receive pulsed magnet prototypes for testing • Looking forward to availability of the injector building in May 2011

  18. Working on injector G. Wang, R. Fliller, J. Rose, R. Heese, G. Fries, B. Parker, F. Willeke, S. Ozaki, E. Johnson, E. Weihreter, Y. Li, S. Kramer, I. Pinayev, M. Ferreira, R. Faussett, Y. Kawashima, M. Johansen, R. Alforque, S. Krinsky, A.Blednykh, O. Dyling, R. Meier, S. Sharma, T. Mennona, B. Kosciuk, D. Hseuh, G. Ganetis, H. Ma, T. Shaftan, O. Singh, J. Skaritka, C. Spataro, E. Golnar, C. Lavelle, P.K. Job, B. Casey, G. Woods

  19. Injector Shielding • Injector shielding includes many supplemental shielding structures • in both transport lines • injection, extraction and shadow shielding in booster • around injection straight in the storage ring In-Vacuum septum Out-of-Vacuum septum R. Alforque

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