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![Page 1: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/1.jpg)
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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![Page 2: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/2.jpg)
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Outline
• Introduction
• BEPCII Power Supply System
• CSNS Power Supply System
• Prototyping R&D for CSNS PS
![Page 3: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/3.jpg)
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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.
![Page 4: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/4.jpg)
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General layout for BEPCII
BESIII
Double Storage Ring
Transport Line
Injector
BSRF
![Page 5: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/5.jpg)
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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
![Page 6: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/6.jpg)
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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
![Page 8: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/8.jpg)
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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
![Page 9: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/9.jpg)
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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
![Page 10: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/10.jpg)
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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- ;
![Page 17: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/17.jpg)
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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
![Page 22: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/22.jpg)
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Test result
• DC mode
Current stability: 3.9910-5/8H
![Page 23: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/23.jpg)
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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
![Page 26: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/26.jpg)
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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
![Page 27: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/27.jpg)
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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.
![Page 34: Chinese Academy of Sciences Institute of High Energy Physics Accelerator Center Power Supply Group Status of BEPCII and CSNS Power Supply System Qi Xin.](https://reader035.fdocuments.in/reader035/viewer/2022062301/5697bfd91a28abf838cafccb/html5/thumbnails/34.jpg)
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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.
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Chinese Academy of SciencesInstitute of High Energy PhysicsAccelerator CenterPower Supply Group
Mailing address 19B Yuquan Lu/ Shijingshan District / Beijing/ China100049