PSB Main Power Supply

Serge Pittet

Jean-Paul Burnet, Karsten Kahle, Fulvio Boattini, Max Chamiot-Clerc

TE-EPC Serge PITTET

LIU-2011 Event, 25/11/2011

TE EPC

• Overview of the existing Booster MPS system.

• The 2GeV requirements.

• LIU baseline: The “POPS” style alternative.

• Technical alternatives.

3

TE EPC

Booster MPS load characteristic

4

Magnets quantity

Total resistance [mOhms]

Total inductance [mH]

Dipoles outer ring 64 172 64

Focusing quadrupoles 128 74 8

Reference magnet 4 10 4

Defocusing quadrupoles 64 51 6

Dipoles inner ring 64 172 64

Total 324 479 146

16 periods, 4 rings

TE EPC

Booster MPS circuit

1.4GeV margins:MPS voltage: -2%

MPS peak current: -2%

MPS rms current: 3%

TRIM A peak current: 40%

TRIM Q peak current: 0%

5

64 BHZ Ring 1&4

Reference magnet

GND

128 QFORing 1,2,3&4

64 QDE Ring 1,2,3&4

64 BHZ Ring 2&3

MPS3600V4000Apk

2300ARMS

TRIM A1900V50Apk

30ARMS

QFO520V300Apk

200ARMS

QDE520V300Apk

200ARMS

TE EPC

Booster MPS: the eighties

6

TE EPC

Booster MPS: 1998 consolidation

Automation & firingTrims

7

TE EPC

• Overview of the existing Booster MPS system.

• The 2GeV requirements.

• LIU baseline: The “POPS” style alternative.

• Technical alternatives.

8

TE EPC

LIU project scaling factors

• From 1.4Gev to 2 GeV.

• Considering some saturation effect, margin for B-field regulation and operation.

• Power dissipation in the magnets with today’s ramp rate

• Power dissipation in the magnets with existing MPS at maximal ramp rate.

New magnets and/or new MPS needed in any case

9

B-field: x1.3

Peak Current: x1.4

Power: x2

Far from design margins (20-30%)…

Power: x1.8

Better but not enough…

TE EPC

The existing Booster MPS at 2 GeV

Upgrade scaling on one cycleMPS peak current: +30%

MPS rms current: +35%

18kV apparent power: +77%

18kV peak power: +45%

TRIM A peak current: +540%

TRIM Q peak current: +40%

10

64 BHZ Ring 1&4

Reference magnet

GND

128 QFO Ring 1,2,3&4

64 QDE Ring 1,2,3&4

64 BHZ Ring 2&3

MPS3600V5300Apk

TRIM A1900V270Apk

QFO520V420Apk

QDE520V420Apk

TE EPC

Impact on the 18kV Meyrin network

Fast transients with 2GeV cycle which can not be compensated by Meyrin SVC.

50% increase of active power, 30% increase of reactive power

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0 0.2 0.4 0.6 0.8 1 1.2 1.40

0.5

1

1.5

2

2.5x 10

7

X: 0.8475Y: 2.081e+007

Reactive Power

X: 0.8676Y: 1.582e+007

1.4GeV

2.0GeV

0 0.2 0.4 0.6 0.8 1 1.2 1.4-1

-0.5

0

0.5

1

1.5

2

2.5x 10

7 Active Power

X: 0.6925Y: 1.368e+007

X: 0.742Y: 2.053e+007

1.4GeV

2.0GeV

TE EPC

• Overview of the existing Booster MPS system.

• The 2GeV requirements.

• LIU baseline: The “POPS” style alternative.

• Technical alternatives.

12

TE EPC

“POPS” basic principles

The energy to be transferred to the magnets is stored in capacitors.

• DC/DC converters transfer the power from the storage capacitors to the magnets.• Four flying capacitors banks are not connected directly to the mains. They are charged via the magnets.• Only two AC/DC converters (called chargers) are connected to the mains and supply the losses of the

system.

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DC3

DC

DC +

-

DC1

DC

DC

DC5

DC

DC +

-

DC4

DC

DC-

+

DC2

DC

DC-

+

DC6

DC

DC

MAGNETS

+

-

+

-

CF11

CF12

CF1

CF21

CF22

CF2

AC

CC1

DC

MV7308

AC AC

CC2

DC

MV7308

AC

18KV ACScc=600MVA

OF1 OF2

RF1 RF2

TW2

Crwb2

TW1

Lw1

Crwb1

Lw2

MAGNETS

AC/DC converter - AFE

DC/DC converter - charger module

DC/DC converter - flying module

Chargers

Flying capacitors

Active power of the magnets

-60000000

-40000000

-20000000

0

20000000

40000000

60000000

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

Time [s]

Po

wer

[W

]

.

Power to the magnets:

+50MW peak

Resistive Losses and charger power

0

2000000

4000000

6000000

8000000

10000000

12000000

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

Time [s]

Po

we

r [W

] .

Power from the mains

10MW

TE EPC

LIU Baseline: Fast cycle

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Upgrade scaling on one cycleMPS peak current: +30%

MPS rms current: +3%

18kV apparent power: -26%

18kV peak power: -78%

DC3

DC

DC +

-

MAGNETS

V_F3

UdcF3

AC

CC1

AC

MV7308

DC

DIP+QF+REF

DC3

DC

DC +

-

V_F3

UdcF3

AC

CC1

AC

MV7308

DC

DIP+QD+REF

DC3

DC

DC +

-

UdcF3

AC

CC1

AC

MV7308

DC

TE EPC

LIU-PSB 5.2 WU– MPS power converter

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physics LS1 physics LS2 physics

2011 2012 2013 2014 2015 2016 2017 2018 2019

Alternative with new

magnet studied

Specification ready for

submission

Design baseline confirmed and

refined

Market survey and call for

tender completed

Converter system

commissioned

Converter commissioned and ready for operation

Converter manufactured and installed

Benefits• Overall voltage available increases and would allow a reduction of the RMS current using a faster ramping.• The capacitor bank totally absorbs the peak power on the 18kV network. Meyrin SVC would then become optional.• Spare sharing between MPS A and B and eventually with POPS.• Only a few new cables needed between the reference magnet (BCER) and the MPS.• New B-field regulation to minimize eddy currents and saturation effects impact at higher current and acceleration rate.

Drawbacks• Cost.

DC3

DC

DC +

-

MAGNETS

V_F3

UdcF3

AC

CC1

AC

MV7308

DC

DIP+QF+REF

DC3

DC

DC +

-

V_F3

UdcF3

AC

CC1

AC

MV7308

DC

DIP+QD+REF

DC3

DC

DC +

-

UdcF3

AC

CC1

AC

MV7308

DC

TE EPC

LIU-PSB 5.2 WU– MPS civil engineering

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physics LS1 physics LS2 physics

2011 2012 2013 2014 2015 2016 2017 2018 2019

Civil engineering

pre-study completed

Civil engineering

heavy workload done

Civil engineering

designed

Building infrastructure

& services ready

With this new building:• We can install and commission during Booster operation.• We have a backup power supply during the first years.• Easy connection to existing cables and cooling services.

TE EPC

Building 245 - Preliminary Drawing

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Designed by Nigel Baddams

TE EPC

• Overview of the existing Booster MPS system.

• The 2GeV requirements.

• LIU baseline: The “POPS” style alternative.

• Technical alternatives.

18

TE EPC

Existing MPS with new magnets

• Preliminary design of the magnets by TE-MSC: R=0.52Ohm, L=0.42H, Inom@2GeV=3500A.• Simulation shows that the existing MPS could be reused (consolidation sill needed!).• Stress on the meyrin 18kV network similar to what is measured today at 1.4GeV.

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TE EPC

New MPS with new magnets

• Allows fast cycle and significant reduction of the RMS current in the magnets.

• Cost of an adapted POPS style MPS to be compared to the consolidation cost of the existing one.

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TE EPC

Comments on Power Consumption

• Values plotted below are based on the existing magnets, 5000 hours of operation per year and 0.051CHF/kWh (average price in 2010).• In any cases several MCHF would be saved on a new supply and/or on electricity consumption with new magnets.• Does not include a foreseeable increase of the price per kWh.

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THANK YOU FOR YOUR ATTENTION!