1 BROOKHAVEN SCIENCE ASSOCIATES Pulsed Magnet System Eric Blum, Senior Science Associate 8 th ASAC...

1 BROOKHAVEN SCIENCE ASSOCIATES

Pulsed Magnet System

Eric Blum, Senior Science Associate8th 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• Michael Johanson• Bernard Kosciuk• Guimei Wang• Dick Hseuh• George Ganetis• Timur Shaftan


Booster Pulsed Magnets

Type H Aperture (mm)

V Aperture (mm)

Total Length(m)

Field (T)

Pulse Length (S)

Pulse Shape

Injection Septum 52 30 0.8 0.111 100E-6 1/2 sine

Extraction Septum 40 16 0.63 0.8 100E-6 1/2 sine

Pulsed Bump 60 20 <0.2 0.47 3E-3 full sine

Injection Kicker 60 20 0.3 0.055 300E-9 215 nsec rise/fall

Extraction Kicker 60 20 0.3 0.076 300E-9 215 nsec rise/fall


Pulsed Septum Magnets

Vladimir Kiselev, Final Design Review, 2/10/2011

100 μs, ½ sine

0.111 T injection

0.8 T extraction


Septum Pulser

R 2

dФ/dt

L load

Q 1

DC-DC1KVOUT

U 1 U L TR A V O L T C 250 1K V

R 1

C 1C 2

Q 2

Powersupplycontrol

DRIVER

L – extraction septum (2.06 H)R1, R2 – 2W 10 Ohm UXP 300, EBGC1, C2 – capacitor banks 300 F 2.5 kV, General AtomicsQ1, Q2 – IGBT module FZ3600R17, EUPECU1 – 1C24-P250, UltraVolt

Alexandr Erokhin, Final Design Review, 2/10/2011


Pulsed Bump Magnets


3 ms full sine

0.47 T


Injection and Extraction Kickers

Vladimir Kiselev, Final Design Review, 2/10/20110.076 T extraction

0.055 T injection


Extraction Kicker Pulser

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%.

Cold cathode thyratron

310 ns flat top<210 ns rise and fall times<0.2% amplitude stability


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


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



• Capabilities• Conduct magnetic measurements on all pulsed magnets• Understand and develop pulsers

– Thyratron– IGBT– SCR

• Test ceramic chamber coatings


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


Test Kicker


Test Kicker Pulser


Measurements

Current (1500 A peak)

Enlargement of Flat Top~±0.3% Ripple


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



• 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



• Starting to develop storage ring diagnostic pinger magnets

Horizontal Pinger Vertical Pinger

Deflection Angle <3 mR <2 mR

Pulse length and shape 2.6 μsec, ½ sine 2.6 μsec, ½ sine

Magnet Length 300 mm 300 mm

Required field 0.1 T 0.067 T

Magnet Inductance 0.84 μH (+ .25 μH leads) 0.12 μH (+ .27 μH leads)

Capacitance, voltage, current 0.52 nF, 3.75 KV, 3.2 KA 1.58 nF, 2.87 KV, 5.4 KA


Storage Ring Pulsed Magnets

• 4 kickers• 0.131 T• <5.2 μs half-sine

• 1 septum• 0.85 T• <200 μs sine


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


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


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


Storage Ring Pulsed Magnet Supplies

ElectricalTriggerPulse

HVPowerSupply

120VAC PN+E

N-Type

WarningLight

Door

Door

EmergencyStop

IndicatorLEDs

Mezzanine SynchrotronTunnel

DC Power 24V

Vacuum

Machine Safety

BNC SHV

Control SystemEPICS

Digital Output(On/Off, Reset)

Pulser Interlock

Digital Input(copy of all Interlocks)

Analog Output(16bit Charging Voltaqe)

Analog Input(16bit Peak Current)

MagnetHV RelayInterlock

Roll Motor(for kickersystems only)

DC Power 24V

HV Interlock toAC Contactor

VmeasVset

Fiber OpticTrigger Pulse

Fan 120V

EPICSStepperMotorDrivers

RackCircuitBreakers

Electical / Optical

Local /Remote

Changeover

BNC SHV

Analog Electronics andRelay Logic

Pulser

Not in Call for Tender

120VAC PN+E

On / Off Relay

RG214Precision PeakDetectorVME format

N-Type

Sample PulseSample Pulse

OutputCurrent

OutputVoltage


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


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.


Additional Slides

• Magnet specification tables follow


Booster Pulsed Septum Magnet Specifications

Type of a magnet Injection Extraction

Energy MeV 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 (horver) mm2 5230 4016

Copper conductor size mm2 328 314

Current A 1500 10220.0

Resistance (at 30C) m 0.7 1.0

Inductance H 1.6 2.1

Pulse length (1/2 sine) s 100 100

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 0.35



Booster Pulsed Bump Magnet SpecificationsNumber of magnets 4

Gap mm 33

Magnetic field amplitude T 0.47 (0.54)

Effective magnetic length m 0.17

Bending angle mrad 7.5 (8.5)

Good magnetic field region mm ± 20

Non-homogeneity within good field region 110-3

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 310-3

Peak current ImaxA 1500 (1750)

Active resistance of magnet Ohm 0.003

Inductance of magnet H 6210-6

Voltage drop active V 4.5

Voltage drop reactive V 200

Average power consumption per magnet W 10 ( 20 -2Hz)

Overall weight of magnet kg 39



Booster Injection and Extraction Kickers

Name of parameter Injection Extraction

Maximum Magnetic Field (T) 0.055 0.076

Effective length, mm 207 207

Magnetic gap, mm 38 38

Gap between the poles, mm 84 84

Bend angle (mrad) 17 6.2

Inductance (nH) 650 650

Peak current on the kickers plates (A) 1650 2300

Maximum Charging voltage of PFN (kV) 21 21

Maximum Voltage in kickers plates (kV) 15 20

Drive Capacitor PFN PFN

Pulse Shape 215 nsec risetime /fall time, 300 nsec flat-top

215 nsec risetime/fall time, 300 nsec flat-top

Magnetic Material Ferrite core CMD5005 Ferrite core CMD5005



Booster Kicker Pulsers


Parameter name

Injection

ExtractionSingle-turn injection (BU3,4SI)

Beam stacking mode 2nd pulse

(BU3,4SI/BU1,2SI)

Maximum current of the kicker plates (A) 1650 1120/795 2300

Maximum pulse modulator output current 3300 2240/1590 4600

Inductance of kicker section (nH) 650 650

Equivalent load inductance (nH) 162.5 325

Pulse flat top (ns) 310 310

Pulse rise time (ns) <210 <210

Pulse fall time (ns) <210 -

Output current instability (including pulse top ripples) ±0.5% (including post pulse ripples) ±0.2%

PFN impedance (Ohm) 5.9 4.4

Maximum Charging voltage of PFN (kV) 20 21

Maximum Voltage on kickers plates (kV) 15 20


Storage Ring Pulsed Magnet Specifications

Kickers Septum

Number 4 1

Maximum field (mT) 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 sine

Pulse Length (μs) <5.2 <200

Maximum repetition rate (Hz) 2 2

1 BROOKHAVEN SCIENCE ASSOCIATES Pulsed Magnet System Eric Blum, Senior Science Associate 8 th ASAC...

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