Chinese Academy of SciencesInstitute of High Energy PhysicsAccelerator CenterPower Supply Group

Status of BEPCII and CSNS Power Supply System

Qi Xin May. 23. 2012

DESY

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Outline

• Introduction

• BEPCII Power Supply System

• CSNS Power Supply System

• Prototyping R&D for CSNS PS

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BEPC II

BEPC II is a two-ring e+e- collider running in the tau-charm energy region (Ecm = 2.0-4.2 GeV), which, with a design luminosity of 1 *1033 cm-2s-1 at the beam energy of 1.89 GeV, is an improvement of a factor of 100 over its successful predecessor, BEPC.

Its installation was completed in the summer of 2005 and it has reached most of the design specifications. The collider consists of two 237.5 m long storage rings, one for electrons and one for positrons. They collide at the interaction point with a horizontal crossing angle of 11 mrad and a bunch spacing of 8 ns. Each ring holds 93 bunches with a beam current of 910 mA. The machine will also provide a high flux of synchrotron radiation at a beam energy of 2.5 GeV.

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General layout for BEPCII

BESIII

Double Storage Ring

Transport Line

Injector

BSRF

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BEPCII Power Supply System

Total 650 sets, DC PS, 2 kinds:

• SCR power supply

1000A/300V, 4 sets , dipole magnet PS

• Switch power supply

200A/70V, chopper, 152 sets, quadrupole and sextupole magnet PS

1700A/120V, 3 sets, insertion quadruple magnet PS

……

• All for analog control PS

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BEPCII Power Supply System

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CSNS -China Spallation Neutron SourceBaseline Schedule

February 2001 idea of CSNS discussedprototyping R&D January 2006 –

detail design January 2011 – December 2011

construction start September 2011

civil construction December 2012 – March 2017

component fabrication September 2011 – September 2015

installation & tests June 2013 – March 2017

RCS commissioning start March 2016

first beam on target March 2017

project complete/operation start March 2018 (6.5 years from start)

The site of CSNS has been selected at Dongguan, Guangdong Province

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CSNS Power Supply System MEBT DC PS

LEBT DC PSDTL DC PS

LRBT DC PS

RTBT DC PS

6 sets Resonant PSProgrammable Pulse PSCorrector DC PS

Injection DC PS

Extraction DC PS

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CSNS Power Supply System

Total 303 sets, three operation modes:

• DC mode

from 10A to 1700A, 239 sets

• AC+DC mode(frequency 25Hz)

2200A/6000V, 1set 1700A/4000V, 1set

1700A/1500V, 1set 1700A/1000V, 3sets

•Programmable Pulse mode

28A/400V, 36 sets

•Full digital control PS

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RCS PS system

PS No. Peak Current（ A）

Peak Voltage（ V）

Power Ratio （ kW）

Tracking error

RCS-BPS 1 2200 6000 3108 0.1%

RCS-QPS1 1 1700 4000 2000 0.1%

RCS-QPS2 1 1700 1500 700 0.1%

RCS-QPS3 1 1700 1000 500 0.1%

RCS-QPS4 1 1700 1000 400 0.1%

RCS-QPS5 1 1700 1000 400 0.1%

RCS-SPS 2 185 120 7 DC

RCS-Trim BH 18 28 500 3%

RCS-Trim BV 18 28 500 3%

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Dipole Magnet and Quadrupole Magnet

Magnet Number

Dipole(BM) 24

Quadrupole(QM)

Q1(272)

Q2(253)

Q3(222)

Q4(206)

48

16

8

8

16

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Resonant network structure for BM &QMSerial resonant network

BPSDC+AC

Lch-B2

Lm-3Lm-4CB-2

Lch-B3

Lm-5Lm-6CB-3

Lch-B4

Lm-7Lm-8CB-4

Lch-B5

Lm-9

Lm-10

CB-5

Lch-B6

Lm-11

Lm-12

CB-6

Lch-B8

Lm-15

Lm-16

CB-8

Lch-B9

Lm-17

Lm-18

CB-9

Lch-B10

Lm-19

Lm-20

CB-10

Lch-B11

Lm-21

Lm-22

CB-11

Lch-B12

Lm-23

Lm-24

CB-12

Lch-B7

Lm-13

Lm-14

CB-7

Lch-B01

Lm-1

Lm-2CB-01

Lch-B00

CB-00

QPS1DC+AC

Lch-Q1-2

Lm-1Lm-2CQ1-2

Lch-Q1-1

CQ1-1 Lm-3Lm-4

Lm-5Lm-6Lm-7Lm-8

QPS2DC+AC

Lch-Q2-01

Lm-1

Lm-2CQ2-01

Lch-Q2-00

CQ2-00

Lm-3

Lm-4Lch-Q2-2

CQ2-2 Lm-5

Lm-6

Lm-7

Lm-8

Lch-Q2-3

CQ2-3Lm-9

Lm-10

Lm-11

Lm-12Lch-Q2-4

CQ2-4Lm-13

Lm-14

Lm-15

Lm-16

QPS3DC+AC

Lch-Q3-2

Lm-1Lm-2CQ3-2

Lch-Q3-1

CQ3-1 Lm-3Lm-4

Lm-5Lm-6Lm-7Lm-8

QPS4DC+AC

Lch-Q4-2

Lm-1Lm-2CQ4-2

Lch-Q4-1

CQ4-1 Lm-3Lm-4

Lm-5Lm-6Lm-7Lm-8

QPS5DC+AC

Lch-Q5-2

Lm-1Lm-2CQ5-2

Lch-Q5-1

CQ5-1 Lm-3Lm-4

Lm-5Lm-6Lm-7Lm-8

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Dipole Resonant network

MagnetParameters

Number of Dipole Magnet 24

Gap （ mm） 160

Effective length (mm) 2100

Frequency (Hz) 25

AC Peak Current (A) 877

DC Current (A) 1227

Total power loss (kW) 45

Inductance (mH) 38.2

ResonantNetworkParameters

Power Supply for Dipole Magnet 1

Magnet No./Cell 2

Resonant cell 12

Magnet inductance (Lm)/cell (mH) 76.4

Capacitance /cell (F) 1062.03

Choke inductance/cell (mH) 76.4

Peak Voltage/cell (V) 10519

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Quadrupole resonant networks

QPS Q265 Q253 Q222 Q206 Q206

Magnet Parameters

Total No. 16 8 8 8 8

DC Current (A) 895.00 829.00 859.00 813.00 813.00

AC Current (A) 638.00 591.00 612.00 580.00 580.00

Peak Voltage (V) 2554.23 1642.33 855.15 740.32 740.32

Total Loss (KW) 35.60 23.50 17.50 14.20 14.20

Inductance (mH) 25.50 17.70 8.90 8.13 8.13

Resonant Network Parameters

Magnet No./cell 4 8 8 8 8

Resonant cell No. 4 1 1 1 1

Capacitance (F) 795.48 573.02 1139.60 1247.53 1247.53

Lch (mH) 51.00 70.80 35.60 32.52 32.52

Peak voltage/cell (V) 10217 13139 6841 5923 5923

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Power Supply Topology

Diode rectifier + H type PWM inverter

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Prototyping R&D for CSNS

• Prototype for Dipole Power Supply(2006.10-2010.11);

• Choke and capacitor bank(2007.2-2010.11);

• Prototype for Quadrupole Power Supply(2009.10-2011.10);

• Prototype for Trim-B Power Supply(2010.6-2011.8);

• Digital Power Supply Control Module(2005- ;

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Specification of the B-PS prototype• Output current: 1260A+900sint;• Output Peak Voltage : 230V;• Extraction current stability: 100ppm/8H;• Injection current stability: 500ppm/8H; • Frequency stability: 100ppm/8H;• THD: 0.02%;

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Test result• Extraction current long term stability: 3.710-5/8H;• Injection current long term stability: 2.2 10-4/8H;• Frequency stability: 2 10-5/8H.

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Choke and Capacitor• Choke is design with multi-gaps, oil cooling tank. The winding is

used the copper strip, the core is used in steel rolling direction;• Capacitor is a single-phase power capacitor of all film type, with very

low dielectric losses and long lifetime.

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Specification of the Q-PS prototype

• DC mode: • Output: 2000A/120V;

• Long term stability: 50ppm;

• AC mode:• Output current: 1150A+820sint;

• Output peak voltage: 300V;

• DC current stability: 100ppm/8H;

• AC current stability: 100ppm/8H;

• Frequency stability: 100ppm/8H;

• Tracking error: 0.1%

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Power Supply prototype for QM

Diode rectifier +Boost+ H type PWM inverter

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Test result

• DC mode

Current stability: 3.9910-5/8H

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Test result• AC mode, 915+652sinwt A; DC current stability: 5.05 10-5/8H; AC current stability: 8.09 10-5/8H; Frequency stability: 1.27 10-5/8H; Tracking error: 0.07%

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Specification of the Trim-B PS prototype• Any programmable pulse waveform;• Output peak current: ±28 A; • Output peak voltage: 400V;• Maximum di/dt: ≥5.6A/mS;• Tracking error: 3%.

parallel resonant half-bridge rectifier +H type chopper

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Test result• Trapezoidal wave: removal of the inflection point;

• Maximum di/dt: 5.6A/mS;

• Tracking error: 0.7%.

Tracking Error

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Test result• Arbitrary waveform: reference to ISIS Trim-B;

• Maximum di/dt: 6.5A/mS;

• Tracking error: -2.5% / 2%.

Tracking Error

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Digital Power Supply Control Module(DPSCM)

• Based on FPGA;

• Physical connection: optical fiber;

• Communication protocol: RS-232;

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DPSCM

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DPSCM for Trim-B PS

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DPSCM for B-PS

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Problem both in B-PS and Q-PS Magnet inductance non-linearity( test result)

BM: ≈ 14% QM: ≈7% Choke: ≈ 1.4%

Power supply output voltage

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Magnet Field TrackingCurrent Tracking

Perfect sinusoidal field

High order harmonic current vector control

Digital Control for B-PS and Q-PS

Change control strategy

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Digital Control for B-PS and Q-PS

• In ensuring perfect sinusoidal magnetic field under the premise,

the real time calculation method replaces the look-up table

method .

• Through precisely controlling the current amplitude and 25Hz

phase to obtain the B/Q magnet field tracking.

• A 100kHz clock signal is used the synchronize the digital Power

Supply Control Module (DPSCM).

• A 25 Hz trigger signal is used to synchronize for BM and QM.

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Digital Control for B-PS and Q-PSHigh order harmonic current vector control one with the original harmonic magnetic field of similar amplitude, phase contrast harmonic field is injected to reverse the original harmonic field , which makes the harmonic field small enough.

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Harmonic injection before and after contrast

Current (after injection)

Current-B Current-Q

1st(25) 100% 100%

2nd(50) 0.882% 0.583%

3rd(75) 0.513% 0.324%

4th(100) 0.224% 0.133%

5th(125) 0.106% 0.058%

6th(150) 0.038% 0.016%

7th(175) 0.022% 0.008%

Field (before injection)

B(BL) Q(GL)

1st(25) 100% 100%

2nd(50) 0.524% 0.713%

3rd(75) 0.112% 0.135%

4th(100) 0.042% 0.094%

5th(125) 0.015% 0.0365

6th(150) 0.010% 0.006%

7th(175) 0.003% 0.015%

Current (before injection)

Current-B Current-Q

1st(25) 100% 100%

2nd(50) 1.301% 1.061%

3rd(75) 0.527% 0.327%

4th(100) 0.202% 0.054%

5th(125) 0.114% 0.025%

6th(150) 0.047% 0.021%

7th(175) 0.021% 0.020%

Field (after injection)

B(BL) Q(GL)

1st(25) 100% 100%

2nd(50) 0.003% 0.005%

3rd(75) 0.005% 0.002%

4th(100) 0.002% 0.006%

5th(125) 0.002% 0.008%

6th(150) 0.001% 0.002%

7th(175) 0.003% 0.001%

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Compare with J-PARC

Current BL

1st (25Hz) 100% 100%

2nd (50Hz) 1.335% 0.003%

3rd (75Hz) 0.841% 0.002%

4th (100Hz) 0.475% 0.001%

5th (125Hz) 0.256% 0.002%

Current BL

1st (25Hz) 100% 100%

2nd (50Hz) 0.882% 0.003%

3rd (75Hz) 0.513% 0.005%

4th (100Hz) 0.224% 0.002%

5th (125Hz) 0.106% 0.002%

Current GL

1st (25Hz) 100% 100%

2nd (50Hz) 1.948% 0.006%

3rd (75Hz) 1.197% 0.006%

4th (100Hz) 0.672% 0.008%

5th (125Hz) 0.333% 0.003%

Current GL

1st (25Hz) 100% 100%

2nd (50Hz) 0.583% 0.005%

3rd (75Hz) 0.324% 0.002%

4th (100Hz) 0.133% 0.006%

5th (125Hz) 0.058% 0.008%

CSNS J-PARC

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Summary

Control strategy • New control strategy solves the technical problem and DPSCM

work well.

Power supply • Not too much consideration of the magnet inductance

nonlinearity . • Pay more attention to the current stability, the DC ripple and the

bandwidth.• Pay more attention to high voltage insulation, energy feedback

protection, grounding protection, module generalization and safety interlock protection.

Chinese Academy of SciencesInstitute of High Energy PhysicsAccelerator CenterPower Supply Group

Mailing address 19B Yuquan Lu/ Shijingshan District / Beijing/ China100049