Pulsed Magnet System Eric Blum, Senior Science Associate 8 th ASAC meeting for NSLS-II Project May 10 -11, 2011 1 BROOKHAVEN SCIENCE
People • Presenting on behalf of Pulsed Magnet Laboratory Staff • Acknowledgements • • • Richard Heese Boyzie Singh Stephen Kowalski Peter Zuhoski Marcello Ferreira Michael Johanson Bernard Kosciuk Guimei Wang Dick Hseuh George Ganetis Timur Shaftan 2 BROOKHAVEN SCIENCE
Booster Pulsed Magnets Type H Aperture (mm) V Aperture (mm) Total Length (m) Field (T) Pulse Length (S) Injection Septum 52 30 0. 8 0. 111 100 E-6 1/2 sine Extraction Septum 40 16 0. 63 0. 8 100 E-6 1/2 sine Pulsed Bump 60 20 <0. 2 0. 47 3 E-3 full sine Injection Kicker 60 20 0. 3 0. 055 300 E-9 215 nsec rise/fall Extraction Kicker 60 20 0. 3 0. 076 300 E-9 215 nsec rise/fall 3 Pulse Shape BROOKHAVEN SCIENCE
Pulsed Septum Magnets 100 μs, ½ sine 0. 111 T injection 0. 8 T extraction Vladimir Kiselev, Final Design Review, 2/10/2011 4 BROOKHAVEN SCIENCE
Septum Pulser L – extraction septum (2. 06 H) R 1, R 2 – 2 W 10 Ohm UXP 300, EBG C 1, C 2 – capacitor banks 300 F 2. 5 k. V, General Atomics Q 1, Q 2 – IGBT module FZ 3600 R 17, EUPEC U 1 – 1 C 24 -P 250, Ultra. Volt Alexandr Erokhin, Final Design Review, 2/10/2011 5 BROOKHAVEN SCIENCE
Pulsed Bump Magnets 3 ms full sine 0. 47 T Vladimir Kiselev, Final Design Review, 2/10/2011 6 BROOKHAVEN SCIENCE
Injection and Extraction Kickers 0. 076 T extraction Vladimir Kiselev, Final Design Review, 2/10/2011 0. 055 T injection 7 BROOKHAVEN SCIENCE
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%. 8 BROOKHAVEN SCIENCE
Current Status • Status • Risks • Mitigation • 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 • BNL staff is unfamiliar with the cold cathode thyratron • Kicker flat top ripple specification is extremely stringent • Requested spares for the thyratron • BNL is developing a pulsed magnet laboratory to verify magnet performance 9 BROOKHAVEN SCIENCE
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 10 BROOKHAVEN SCIENCE
Pulsed Magnet Laboratory 11 BROOKHAVEN SCIENCE
Pulsed Magnet Laboratory • Capabilities • Conduct magnetic measurements on all pulsed magnets • Understand develop pulsers – Thyratron – IGBT – SCR • Test ceramic chamber coatings 12 BROOKHAVEN SCIENCE
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 13 BROOKHAVEN SCIENCE
Test Kicker 14 BROOKHAVEN SCIENCE
Test Kicker Pulser 15 BROOKHAVEN SCIENCE
Measurements Current (1500 A peak) Enlargement of Flat Top ~± 0. 3% Ripple 16 BROOKHAVEN SCIENCE
Pulsed Magnet Lab Plans • Magnetic measurement system • Completing analog integrator 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 17 BROOKHAVEN SCIENCE
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 18 BROOKHAVEN SCIENCE
Pulsed Magnet Lab Plans • Starting to develop storage ring diagnostic pinger magnets Horizontal Pinger Vertical Pinger <3 m. R <2 m. R 2. 6 μsec, ½ sine Magnet Length 300 mm Required field 0. 1 T 0. 067 T 0. 84 μH (+. 25 μH leads) 0. 12 μH (+. 27 μH leads) 0. 52 n. F, 3. 75 KV, 3. 2 KA 1. 58 n. F, 2. 87 KV, 5. 4 KA Deflection Angle Pulse length and shape Magnet Inductance Capacitance, voltage, current 19 BROOKHAVEN SCIENCE
Storage Ring Pulsed Magnets • 4 kickers • 0. 131 T • <5. 2 μs half-sine • 1 septum • 0. 85 T • <200 μs sine 20 BROOKHAVEN SCIENCE
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 21 BROOKHAVEN SCIENCE
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 22 BROOKHAVEN SCIENCE
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 23 BROOKHAVEN SCIENCE
Storage Ring Pulsed Magnet Supplies 24 BROOKHAVEN SCIENCE
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 25 BROOKHAVEN SCIENCE
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. 26 BROOKHAVEN SCIENCE
Additional Slides • Magnet specification tables follow 27 BROOKHAVEN SCIENCE
Booster Pulsed Septum Magnet Specifications Type of a magnet Injection Extraction Energy Me. V 200 3000 Deflection angle mrad 125 48 Effective length m 0. 75 0. 6 Total length m 0. 8 0. 63 Magnetic field T 0. 111 0. 8 Aperture (hor ver) mm 2 52 30 40 16 Copper conductor size mm 2 3 28 3 14 Current A 1500 10220. 0 Resistance (at 30 C) m 0. 7 1. 0 Inductance H 1. 6 2. 1 Pulse length (1/2 sine) s 100 Maximal voltage V 140 680 Power loss per magnet(2 Hz) W 2 35 Field stability % 0. 05 0. 02 Total magnet weight kg 170 150 Lamination thickness mm 0. 35 Vladimir Kiselev, Final Design Review, 2/10/2011 28 BROOKHAVEN SCIENCE
Booster Pulsed Bump Magnet Specifications Number of magnets 4 Gap mm 33 Magnetic field amplitude T 0. 47 (0. 54) Effective magnetic length m 0. 17 mrad 7. 5 (8. 5) mm ± 20 Bending angle Good magnetic field region Non-homogeneity within good field region 1 10 -3 Overall length of the magnet along the orbit mm < 200 Lamina thickness mm 0. 5 Number of coils 2 Number of turns per coil 4 Pulse length (1 sinusoid) s 3 10 -3 Peak current Imax A 1500 (1750) Ohm 0. 003 Inductance of magnet H 62 10 -6 Voltage drop active V 4. 5 Voltage drop reactive V 200 Average power consumption per magnet W 10 ( 20 -2 Hz) Overall weight of magnet kg 39 Active resistance of magnet Vladimir Kiselev, Final Design Review, 2/10/2011 29 BROOKHAVEN SCIENCE
Booster Injection and Extraction Kickers Name of parameter Injection Extraction 0. 055 0. 076 Effective length, mm 207 Magnetic gap, mm 38 38 Gap between the poles, mm 84 84 Bend angle (mrad) 17 6. 2 Inductance (n. H) 650 Peak current on the kickers plates (A) 1650 2300 Maximum Charging voltage of PFN (k. V) 21 21 Maximum Voltage in kickers plates (k. V) 15 20 PFN 215 nsec risetime / fall time, 300 nsec flat-top 215 nsec risetime/fall time, 300 nsec flat-top Ferrite core CMD 5005 Maximum Magnetic Field (T) Drive Capacitor Pulse Shape Magnetic Material Vladimir Kiselev, Final Design Review, 2/10/2011 30 BROOKHAVEN SCIENCE
Booster Kicker Pulsers Injection Parameter name Single-turn injection (BU 3, 4 SI) Beam stacking mode 2 nd pulse (BU 3, 4 SI/BU 1, 2 SI) Extraction Maximum current of the kicker plates (A) 1650 1120/795 2300 Maximum pulse modulator output current 3300 2240/1590 4600 Inductance of kicker section (n. H) 650 Equivalent load inductance (n. H) 162. 5 325 Pulse flat top (ns) 310 Pulse rise time (ns) <210 Pulse fall time (ns) <210 - ± 0. 5% (including post pulse ripples) ± 0. 2% PFN impedance (Ohm) 5. 9 4. 4 Maximum Charging voltage of PFN (k. V) 20 21 Maximum Voltage on kickers plates (k. V) 15 20 Output current instability (including pulse top ripples) Vladimir Kiselev, Final Design Review, 2/10/2011 31 BROOKHAVEN SCIENCE
Storage Ring Pulsed Magnet Specifications Kickers Septum 4 1 Maximum field (m. T) 131 850 Maximum yoke length (mm) 650 1300 Maximum bend angle (mrad) 7. 85 100 Septum radius of curvature (m) NA 13 Magnet aperture (x vs. y) (mm) 90 x 41 24 x 10 Chamber Aperture (x vs. y) (mm) 76 x 25 20 x 7 Pulse shape ½ sine <5. 2 <200 2 2 Number Pulse Length (μs) Maximum repetition rate (Hz) 32 BROOKHAVEN SCIENCE
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