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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
• 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
11
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.
13
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
14
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
15
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
16
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
• 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.
19
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.
20
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.
21