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Pulsed Magnet System

Pulsed Magnet System. Eric Blum, Senior Science Associate 8 th ASAC meeting for NSLS-II Project May 10-11, 2011. People. Presenting on behalf of Pulsed Magnet Laboratory Staff Richard Heese Boyzie Singh Stephen Kowalski Peter Zuhoski Acknowledgements Marcello Ferreira

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Pulsed Magnet System

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  1. Pulsed Magnet System Eric Blum, Senior Science Associate 8th ASAC meeting for NSLS-II Project May 10-11, 2011

  2. People • Presenting on behalf of Pulsed Magnet Laboratory Staff • Richard Heese • Boyzie Singh • Stephen Kowalski • Peter Zuhoski • Acknowledgements • Marcello Ferreira • Michael Johanson • Bernard Kosciuk • Guimei Wang • Dick Hseuh • George Ganetis • Timur Shaftan

  3. Booster Pulsed Magnets

  4. Pulsed Septum Magnets 100 μs, ½ sine 0.111 T injection 0.8 T extraction Vladimir Kiselev, Final Design Review, 2/10/2011

  5. Septum Pulser L – extraction septum (2.06 H) R1, R2 – 2W 10 Ohm UXP 300, EBG C1, C2 – capacitor banks 300 F 2.5 kV, General Atomics Q1, Q2 – IGBT module FZ3600R17, EUPEC U1 – 1C24-P250, UltraVolt Alexandr Erokhin, Final Design Review, 2/10/2011

  6. Pulsed Bump Magnets 3 ms full sine 0.47 T Vladimir Kiselev, Final Design Review, 2/10/2011

  7. Injection and Extraction Kickers 0.076 T extraction 0.055 T injection Vladimir Kiselev, Final Design Review, 2/10/2011

  8. Extraction Kicker Pulser 310 ns flat top <210 ns rise and fall times <0.2% amplitude stability Cold cathode thyratron Injection kicker is similar but uses a single pulser for the one kicker module and has a saturable choke to suppress post pulse oscillations. Amplitude stability requirement < 0.5%.

  9. Current Status • Status • Systems under construction at BINP • First kicker ready for review early July • We hope to receive the first kicker at BNL soon after completion • Magnets are due to arrive at BNL by Spring, 2012 • Risks • BNL staff is unfamiliar with the cold cathode thyratron • Kicker flat top ripple specification is extremely stringent • Mitigation • Requested spares for the thyratron • BNL is developing a pulsed magnet laboratory to verify magnet performance

  10. Pulsed Magnet Laboratory • The pulsed magnet lab accomplishes the following tasks: • Train NSLS-II staff in pulsed magnet technology • Understand pulsers • Correct problems when the magnets arrive • Fix the magnets when they break • Build proof of concept prototypes • Write reasonable specifications • Verify performance of purchased kickers • Magnetic measurements

  11. Pulsed Magnet Laboratory

  12. Pulsed Magnet Laboratory • Capabilities • Conduct magnetic measurements on all pulsed magnets • Understand and develop pulsers • Thyratron • IGBT • SCR • Test ceramic chamber coatings

  13. Test Kicker • Similar to booster kickers • 43 mm (v) x 70 mm (h) x 500 mm (length) • 500 Gauss field • 200 ns rise • 300 ns flat top • <±0.4% flat top irregularity

  14. Test Kicker

  15. Test Kicker Pulser

  16. Measurements Current (1500 A peak) Enlargement of Flat Top ~±0.3% Ripple

  17. Pulsed Magnet Lab Plans • Magnetic measurement system • Completing analog integrator for field probe • Translation stage for field probe • Automated measurement of integrated field vs. transverse position • Manual adjustment of vertical position • Designing curved probe for septum measurements

  18. Pulsed Magnet Lab Plans • Ceramic chamber coating characterization • Technique described by Doose, et. al., from the APS at PAC 97. • Works by measuring coupling of an AC field from a coil outside the chamber to the coating inside • No contact with inner surface, thus no risk of damage or contamination • Can find local variation of coating thickness

  19. Pulsed Magnet Lab Plans • Starting to develop storage ring diagnostic pinger magnets

  20. Storage Ring Pulsed Magnets • 4 kickers • 0.131 T • <5.2 μs half-sine • 1 septum • 0.85 T • <200 μs sine

  21. September 2010 Review • Original proposal • Orbit distortion <10% of stored beam size outside injection straight at SR source points • Amplitude error < 4 x 10-5 • Timing jitter <74 ps • Roll Error 10 μrad • Septum leakage field < 6 μT-m • Review said this was far too stringent • Provided a table of achieved performance at other light sources

  22. Storage Ring Pulsed Magnet Specifications • In response to the review we revised the specs as follows • Kicker • Waveform amplitude variation <0.1% • Timing jitter < 1 ns • Septum • Amplitude variation < 0.01% • Timing jitter < 10 ns • Leakage < 30μT-m

  23. Storage Ring Pulsed Magnet Tuning • SPEAR 3 example • Safranek reduced orbit errors from 1 mm peak-to-peak to 20 μm by adjusting kicker amplitude, timing, and xy coupling using skew quads and a special multipole magnet • We will have remote kicker roll adjustment

  24. Storage Ring Pulsed Magnet Supplies

  25. Storage Ring Pulsed Magnet Status • Status • Kickers and septum out fo bid • Purchase to include • 5 kickers • 1 septum • Pulsers and charging power supplies • Stands and supports • Vacuum chambers for the pulsed magnets • All cables and wiring • 5 vendors were contacted • Bids are due in early June • Risks • No bids • Bids will be too expensive

  26. Conclusions • BINP construction of booster pulsed magnets well underway. • BNL pulsed magnet lab is preparing to measure the magnets when they arrive • Storage ring pulsed magnets are out for bid.

  27. Additional Slides • Magnet specification tables follow

  28. Booster Pulsed Septum Magnet Specifications Vladimir Kiselev, Final Design Review, 2/10/2011

  29. Booster Pulsed Bump Magnet Specifications Vladimir Kiselev, Final Design Review, 2/10/2011

  30. Booster Injection and Extraction Kickers Vladimir Kiselev, Final Design Review, 2/10/2011

  31. Booster Kicker Pulsers Vladimir Kiselev, Final Design Review, 2/10/2011

  32. Storage Ring Pulsed Magnet Specifications

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