Transcript Preparation of the Hardware Commissioning

Status of LHC-TB Power Converters
Hugues Thiesen
TE-EPC
Internal review of superconductor and magnet laboratories
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Internal review of superconductor and magnet laboratories - Status of LHC-TB Power Converters
Contents
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Inventory of power converters
Status of power converters
AC and CV infrastructures
Client requests
Conclusions and recommendations
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Internal review of superconductor and magnet laboratories - Status of LHC-TB Power Converters
Inventory of power converters
 Power converters have been designed for LHC applications
 High current (up to 15 kA) and Low voltage (6V to 16V)
 Main PCs are unipolar in current and Corrector PCs are limited to 600A
 40 power converters in 8 different laboratories
 4 in Block-4 for diode packs and special magnets
 1 x [15kA/25V] thyristor power converter (20kA)
 2 x [±600A/±12V] switch mode power converters (CIRTEM)
 1 x [±2kA/±10V] modified LEP type D power converter
 5 in building 163 for superconducting cables
 3 x [16kA/6V] switch mode power converters (Danfysik)
 1 x [4kA/8V] switch mode power converter (Kempower)
 1 x 1Q with mechanical polarity switch (ISR power converter)
 1 in building 180 for Atlas (Out of Service since 2006)
 1 x [24kA/6V] switch mode power converters (Danfysik)
 1 in building 281 for 600A HTS current leads
 1 x [±600A/±12V] switch mode power converters (Transtechnik)
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Internal review of superconductor and magnet laboratories - Status of LHC-TB Power Converters
Inventory of power converters
 40 power converters in 8 different laboratories (cont.)
 1 in SM-18 for RF cavities
 1 x [100kV/40A] LEP RF power converter
 2 in SM-18 for calibration of magnetic instrumentation
 1 x [200A/300V] LEP type B power converter
 1 x [±600A/±12V] switch mode power converter (Transtechnik)
 1 in SM-18 for 13 kA current leads (Out of Service since 2004)
 1 x [15kA/16V] switch mode power converters (Transtechnik)
 26 in SM-18 for MQ and MB magnets
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1 x [15kA/±70V] thyristor power converter (20kA)
5 x [15kA/±16V] thyristor power converter
6 x [±600A/±12V] switch mode power converter (Transtechnik)
6 x [±600A/±12V] switch mode power converter (CIRTEM)
4 x [±60A/±8V] switch mode power converter (LHC prototype)
2 x [±60A/±8V] switch mode power converter (LHC series)
2 x [±120A/±10V] switch mode power converters (LHC series)
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Internal review of superconductor and magnet laboratories - Status of LHC-TB Power Converters
Status of power converters
 Status of power converters
 14 different types of power converters
 Between 10 and 20 years old
 Prototype PCs or modified PCs
 Main issues
 Number of spare parts is limited
 No spare parts for the [±2kA/±10V] power converter in Block-4
 No spare parts for the 18kV transformer (special transformer with 2
outputs) used for the [15kA/±70V] power converter in SM-18 (cluster A)
 Obsolescence of the components
 Power semiconductors
 Digital electronics
 End of the lifetime for several devices
 MCB for the [15kA/±16V] power converters (MTB in SM18)
 Difficulties to modify the power converters
 It is not possible to modify the internal software for several PCs (LEP)
 It is difficult to modify the software of the MTB PCs
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Internal review of superconductor and magnet laboratories - Status of LHC-TB Power Converters
AC and Water infrastructures
 AC infrastructure
 No problem with the existing AC infrastructures if no additional power
converters are requested
 The AC infrastructures have been designed for the initial requests only
 1 x (2MVA, 400V) switch-board free in SM-18 (String II)
 Possibility to install the Block-4 power converters in SM-18
 Cooling infrastructure
 In general, no problem with the existing cooling infrastructures if no
additional power converters are requested
 Limited capacity in SM-18
 No possibility of using the 6 MTBs at the same time (max. 3)
 Water cooling problem if the Block-4 power converters are installed in SM-18
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Internal review of superconductor and magnet laboratories - Status of LHC-TB Power Converters
Analysis of client requests
 LHC spares and stock
 No major problem (limited activity)
 Main issues
 The diode packs can be tested only in Block-4 with the [15kA-25V] power converter
(special test bench)
 The 15kA power converter of the CL test bench is not operational
 LHC operation support
 No major problem (limited activity)
 LHC upgrade phase I
 Main issues
 For this moment the corrector power converters are limited to 600A
([±600A/±12V])
 The needs for the string test must be defined
 Development requests
 The requests must be clearly defined
 Specifications (maximum current and voltage, accuracy, etc…)
 Types of power converters (1Q, 2Q, etc…)
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Conclusions and recommendations
Internal review of superconductor and magnet laboratories - Status of LHC-TB Power Converters
 Conclusions and recommendations
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The LHC TB power converters have been designed for LHC (max.
current is 15 kA). 20kA can be reached in SM-18 (Cluster A) but new
DCCTs must be bought.
The [24kA/6V] power converter in building 180 and the [15kA/16V]
power converter in SM-18 are not operational. The 24kA can be restart
but the 15kA must be replaced.
The [±2kA/±10V] power converter in Block-4 is at the end of its
lifetime and must be replaced.
The ISR power converter in building 163 is obsolete and must be
replaced.
4 of the 6 [±60A/±8V] power converters in SM-18 are prototype power
converters. The replacement of these 4 power converters by LHC
power converters (750 in operation) is strongly recommended.
All software modifications are difficult or impossible. The replacement
of the control electronics (FGC-1) of the SM-18 power converters by
LHC control electronics (FGC-2) is strongly recommended.
No problem to support a limited activity. If the activity must increase, a
PC consolidation must be planed (e.g. MCB of the main PC of the MTB
in SM-18)
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