power converters for magnets

18, 19, 20 February 2002

Power Converters for magnets (PBS 1.2.3)

R. GENAND SL/PO

1

Power Converters for Magnets

– Introduction– Specification

• Magnet characteristics• SPS supercycles

– Design optimization• Generalities• Power converters characteristics• BB4 building• Power converter renovation• Provisional budget• Vacuum chamber protection• CNGS and TI8 main bend powering with electronic switch• CNGS and TI8 main bend powering with mechanical switch• CNGS transfer line cycle

– Status in February 2002– Summary

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Introduction

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Specification (magnet characteristics)

Power Magnet Magnet Magnet Number R per L per Inom I max StabilityConv. Name Name Type of Magnet magnet max DCCT 1/2 hour

Nb (Installation) (Optics) in Series mOhm mH A A (+/-)1 MBSG410010 MBS MBS 8 5 7.5 3600 4400 1*10-4

Switch MBG 410147 B1 MBG 73 4.88 5.7 5100 5400 2*10-51 MDSV400368 MDS 1 150 109 ± 315 ± 400 1*10-41 MDSV 412153 MDH1 MDSH 1 150 109 ± 315 ± 400 1*10-41 MDSH 412243 MDV1 MDSV 1 150 109 ± 315 ± 400 1*10-41 MDSV 412419 MDH2 MDSH 1 150 109 ± 315 ± 400 1*10-41 MDSH 412421 MDV2 MDSV 1 150 109 ± 315 ± 400 1*10-41 QTLD 410100 QTL5 QTL 1 276 390 280 400 1*10-41 QTGF 410200 QTN1 QTG 1 56 36 420 500 1*10-41 QTGD 410300 QTND QTG 7 56 36 400 500 1*10-41 QTGF 410400 QTNF QTG 7 56 36 380 500 1*10-41 QTGD 411700 QTN5 QTG 1 56 36 380 500 1*10-41 QTGF 411800 QTN6 QTG 1 56 36 430 500 1*10-41 QTGD 411900 QTN7 QTG 1 56 36 420 500 1*10-41 QTGF 412000 QTN8 QTG 1 56 36 260 400 1*10-41 QTGD 412100 QTN9 QTG 1 56 36 170 300 1*10-41 QTL 412200 QTL10 QTL 1 276 390 270 400 1*10-4

QTS 412200 QTS10 QTS 1 120 1981 QTL 412300 QTL11 QTL 3 276 390 280 400 1*10-41 QTL 412400 QTL12 QTL 2 276 390 420 500 1*10-4

QTS 412400 QTS12 QTS 1 120 1982 Spare 3/4/5002015 MDGV/H ± 3.5 ± 3.5 5*10-4

35 TOTAL All the big power converters are pulsed

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Specification (SPS supercycles)

The second cycle is very restricting because we have to change the TI8 cycle to a CNGS cycle very quickly and it is foreseen to use the same

power converter to feed both main bend chains (TI8 and CNGS) one after the other.

CNGS+ LHC

CNGS + fixed target

Possible SPSsupercycles(preliminary):

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Design optimization (generalities)

• The CNGS transfer line and the LHC transfer lines will be part of the SPS system. All the power converters will be controlled by the MUGEF. The MUGEF is the present SPS remote control system.

• All the big converters will be pulsed for economical reasons (electrical power and thermal design).

• A maximum of power converters will be recuperated from LEP and SPS.• The MBI magnets (TI8) and MBG magnets (CNGS) were specially designed

to re-use the LEP main bend power converters. To reduce the CNGS project cost, it was decided to use the same power converter to feed MBI or MBG via a power switch (this solution saves about 1.5 million CHF).

• All the power converters for TT41 will be installed in BB4 (existing building close to the shaft).

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Power converter characteristics

Power Magnet Number Inom I max P.C. Irms Load Load L di/dt U Max Converter Origin Umax ImaxConv. Name of max DCCT Loc. (DCCT x R L t=1.7s type Conv. Conv.

Nb (Installation) in Series [A] [A] 0.55) mOhm mH V V

1 MBSG410010 8 3600 4400 BB4 2420 49 60 155 370 R121* SPS 510 6000Switch MBG 410147 73 5100 5400 BA4 2970 402 416.1 1322 3493 2xMB* LEP 3600 5400

1 MDSV400368 1 ± 315 ± 400 BA4 220 239 109 26 121 NO8 New 125 ± 4001 MDSV 412153 1 ± 315 ± 400 BB4 220 314 109 26 151 R33S SPS 262 ± 4001 MDSH 412243 1 ± 315 ± 400 BB4 220 319 109 26 153 R33S SPS 262 ± 4001 MDSV 412419 1 ± 315 ± 400 BB4 220 322 109 26 155 R33S SPS 262 ± 4001 MDSH 412421 1 ± 315 ± 400 BB4 220 322 109 26 155 R33S SPS 262 ± 4001 QTLD 410100 1 280 400 BB4 220 353 390 92 233 B10 LEP 250 3601 QTGF 410200 1 420 500 BB4 275 118 36 11 69 B5 LEP 225 6001 QTGD 410300 7 400 500 BB4 275 492 252 74 320 B7 LEP 350 6001 QTGF 410400 7 380 500 BB4 275 497 252 74 323 B7 LEP 350 6001 QTGD 411700 1 380 500 BB4 275 192 36 11 106 B8 LEP 210 7201 QTGF 411800 1 430 500 BB4 275 196 36 11 108 B8 LEP 210 7201 QTGD 411900 1 420 500 BB4 275 200 36 11 110 B8 LEP 210 7201 QTGF 412000 1 260 400 BB4 220 204 36 8 90 B10 LEP 250 3601 QTGD 412100 1 170 300 BB4 165 208 36 6 69 B2 LEP 200 3001 QTL 412200 1 270 400 BB4 220 454 390 138 373 B12 LEP 400 360

QTS 412200 1 132 1981 QTL 412300 3 280 400 BB4 220 1065 1170 275 701 B9 LEP 700 3601 QTL 412400 2 420 500 BB4 275 763 780 288 735 R34XS SPS 710 500

QTS 412400 1 132 1981 Spare 3/4/500 BB4 R34XS SPS 710 ± 5001 Spare 3/4/500 BB4 B9 LEP 350 7202015 MDGV/H ± 3.5 ± 3.5 BB4 COD New 70 ± 3.5

35 TOTAL LEP 12 + 2 Peak power in BB4 18kV : 4100 kVA * water cooledSPS 7 400V : 3600kVA

News 1 + 15

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BB4 building

The power converters will be installed in an existing building. It will need to be cleaned and the false floor will be adjusted to receive the power converters (this cost is in ST budget).

CNGS Power Converters

BB 4

PAP4

RS2135

RS2136

VENTILATIONRE

1832

RS3178

RA

173

0

RA

173

1

RA

173

2

RA

173

3

Toilet

RE2416

EKT415.2 EKT4151

ES

D2

10/B

4

EBD450/B4 2 MVA

EMT212/B4 GL4

BHA4

AC

CE

SS

CO

NT

RO

LS

YS

TE

M

QTGF 4200/B10QTGF 4040/B7 QTGD 4170/B8

MDSH4215

TYPE R33S

MDSV4224

TYPE R33S

MDSH4241

TYPE R33S

MDSV4241

TYPE R33S

Spare

TYPE R34S

QTL/QTS4240

TYPE R34SQTGD 4210/B2

SPARE/B9

MBS 4001MSE MSE

IntercomIntercom

QTLD 4010/B10

QTL 4230/B9

MBS 4001

TYPE 123MSE

Magnet+

Interco

QTGF 4020/B5

QTGD 4030/B7

QTGF 4180/B8

QTL 4220/B12

CODMUGEF COD

MBS4001

EMT311/B4

A.U.Control

FireDetect

ERD4/B4EBD4/B4

Miscellaneous Equipment

EBD451/B4

Extraction System

MSE

TYPE 60QTGD 4190/B8

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Power converter renovation

The old power converters coming from SPS and LEP need refurbishing to improve their reliability

• New electronics crate for regulation and remote control• New DCCTs (Direct Current Current Transformers)• New motor-driven circuit-breaker• Cabling modifications for new electronics adaptation and electro-

magnetic compatibility improvementFor the power parts of the power converters, the price of the refurbishment

is about 30% of new converters.

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Provisional budget

17 old converters + 2 spares + 18 MDGV/H (15 + 3 spares) + 1 New

• New electronics + DCCTs 20x12= 240• LEP converter modifications with new MCB 12x8= 96• SPS converter renovation 7 units 242• Power electronic switch for MBG 175x1= 175• New COD for MDGV/H 18x2.5= 45• New power converter 400A/125V 40x1= 40• Spares 30• Total 868• Manpower (installation + commissioning) 40• Total 908• Remote control system (MUGEF, installation + commissioning) 100• Total 1008

kCHF

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Vacuum chamber protection

• In case of power converter fault or power converter drift, there is a significant risk of irradiation and even perforation of the vacuum chamber.

• We have to protect the vacuum chamber. To do that, the idea is to measure all the power converter currents in real time, to check if all are inside the tolerances on the flat top and to send a global extraction permit signal or an extraction abort signal to the kickers some milliseconds before extraction.

• This new development must be done for the LHC transfer lines where the problem is more critical. CNGS will profit of this.

• This work is in a process of realization by the remote control team in our group with the MUGEF system.

• The first results in the laboratory are promising.

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CNGS and TI8 main bend poweringwith electronic switch

To comply with the SPS supercycle specification, we must use an electronic switch. Since it is not a safe element, if we want to give access in TI8 while CNGS is running, we will need mechanical switches to

disconnect the MBI.

MUGEF

DCCT

Ref.

Cyclestatus

MUGEF

ADC

ADC

Extractionpermit / abort

TI 8Main

Dipoles

CNGSMain

Dipoles

ControlSystem

3 600 V

5 400 Apeak

MB 1 MASTER

MB 2 SLAVE

Firing

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CNGS and TI8 main bend poweringwith mechanical switch only

With more time between LHC cycle and CNGS cycle (~20s) and a number of operations limited (a few per day), it would be possible to use an easier and cheaper design. With only one mechanical switch, we can

gain ~ 100 kCHF.

MUGEF

DCCT

Ref.

Cycle status

TI 8Main

Dipoles

CNGSMain

Dipoles

ControlSystem

3 600 V

5 400 Apeak

MB 1 MASTER

MB 2 SLAVE

MUGEF

ADC

ADC

Extractionpermit / abort

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CNGS transfer line cycle

• In a transfer line, the only significant performance portion is the flat top for the passage of the beam. But, to reduce electrical consumption and cooling power, we have to decrease the r.m.s. current value as much as possible.

• The CNGS cycle is short. It is difficult to reduce the r.m.s. value because it involves high dI/dt. In addition, we need a flat top length of about 300 ms to reach the right values without overshoot.

The initial estimate was 60% of the flat top value but with optimized current references, we can assure 55%.

CNGS current cycles

0

1000

2000

3000

4000

5000

6000

0 1000 2000 3000 4000 5000 6000 7000

Time (ms)

Cu

rre

nt

(A)

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Status in February 2002

• The power converters coming from SPS are already refurbished, delivered to CERN, cost committed or already paid.

• The new power converters for the small correctors (MDGH/V) are delivered to CERN, cost committed or already paid.

• The new power converter for the big corrector (MDS) is not yet ordered.

• For the power converters coming from LEP and for MBI/MBG sharing system, nothing has been done yet.

• For the remote control system, 80% of the cost is committed.• Budget situation:

Committed or paid Future spendingkCHF kCHF

Converters (material) 303 565Manpower 40Remote control 80 20TOTAL 383 625

525 kCHF without electronic switch

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Summary

• Globally, for CNGS, the power converters and their control system can be looked upon as a copy of the LHC transfer line power converters.But:we have to study, design and manufacture the switch for MBI and MBG supply:

- More difficult and expensive with electronic switch but runs with supercycle.

- Easier and cheaper with mechanical switch only (gain ~ 100 kCHF) but waste of time during change of cycle (~ 20s) and number of operations limited (a few per day). If this solution is chosen, it will be possible to add the electronic switch in the future without problem (just money wise).

• Presently some expenses have been delayed. If the situation is clarified in 2002, there will be no consequences on the planning (start up 2005), nor on the cost. If it is not the case, there will be consequences on both aspects.

power converters for magnets

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