Transcript QPS Data Transmission after LS1

QPS Data Transmission after LS1
TIMBER
TE-MPE-EP, RD, 06-Dec-2013
R. Denz, TE-MPE-EP
WinCC OA
PM
Tsunami warning: https://cds.cern.ch/record/1424362 (Feb. 2012)
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QPS - protection of superconducting elements in the LHC
Circuit type
Quantity
Main bends and quads
24
Inner triplets
8
Insertion region magnets
94
• Dependability
of the
system is critical for LHC performance.
Corrector circuits
600 A
418
• Due to the mere size
of the system, reliability, availability and
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maintainability are a major challenge.
• QPS supervision is used for the operation of the system and for
the diagnostics of the superconducting elements.
Protection system type
Quantity
• During LHC operation access to the QPS systems is very
Quench detection
systems
13440
restricted
and practically impossible
for the superconducting
elements
warm-up!).
Quench heater
discharge(
power
supplies
6076
• In consequence it is vital to have a maximum of information
Energy extraction systems 13 kA
32
available for remote diagnostics.
TE-MPE-EP, RD, 06-Dec-2013
Total
Energy extraction systems 600 A
202
Data acquisition systems
2574 (~2300 exposed to ionizing radiation)
Software supervision channels
93584
System interlocks (hardwired)
13560
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TE-MPE-EP, RD, 06-Dec-2013
QPS supervision - basic architecture
QPS supervision provides data for:
• Operator screens (WinCC OA) and expert consoles
• Software interlocks (QPS_OK signal)
• LHC logging database
• Post mortem servers, viewers and automatic analysis
• Warning 600
generation
(SMS,
email) forLeads
pre-defined
faults states
A
IPD, IPQ, IT
main circuits
EE
(e.g. loss of a quench heater power supply)
nQPS
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QPS DAQ systems
 Fieldbus (WorldFip™) controlled data acquisition
system
– Synchronized to accelerator time (∆t = 1 ms)
– Up to 8 analog input channels and up to 80
digital I/O channels
– Interfaces to associated equipment (SPI or I2C)
• Up to 16 active clients
 2574 devices in LHC (~2300 exposed to ionizing
radiation)
TE-MPE-EP, RD, 06-Dec-2013
– Required radiation tolerance restricts
functionality of field devices e.g. for data
buffering and filtering
 The present soon obsolete and not fully radiation
tolerant field-bus coupler of the MicroFip™ type will
be superseded by the CERN made NanoFip
– New circuit boards, firmware, supervision
software …
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QPS raw data rates (the view from the bottom …)
 Fieldbus of the WorldFIP™ standard (1 Mbit/s)
• WorldFIP™ macro-cycle length tmacro = 100 ms (pre LS1 200 ms)
• Clients are based on the MicroFIP™ ASIC
• Consumed variables TIME (global) and COMMAND, 8 Bytes each
• Produced variables DATA0, 1, 2, 3 (24 Bytes each)
• About 90% of the QPS fieldbus couplers are exposed to ionizing radiation
• Limited functionality with respect to data buffering and filtering
 Raw data rates (not compressed, containing all available information)
TE-MPE-EP, RD, 06-Dec-2013
 post LS1/ pre LS1 = QPS2014/QPS2008 = 2 (≠ Moore’s law)
MB/s
GB/h
GB/day
TB/week
TB/year
Nominal
1.1
4.0
96.6
0.7
35.3
Maximum
2.5
8.9
213.5
1.5
77.9
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QPS data types
 Booleans (flags) and states
• On change recording acceptable if signal refreshment can be traced (is true ...)
TE-MPE-EP, RD, 06-Dec-2013
 Slow analog values (0.1 Hz)
• Newly created for post LS1 operation
• The major change compared to the pre LS1 situation is the
• Quench heater discharge power supply charging voltage (fast recording only
suppression of the on change data recording of analog values
during PM required)
using dead bands.
• Many
by QPS
operators and users.
• HTS
currentcomplaints
lead protection
systems
• Significant part of recorded analog data actually has been
• Bus-bar splice protection systems
rendered useless by on change recording.
• On• change
recording
or filtering will
not introduce
permitted automatic consistency
Post LS1
QPS operation
checks depending on properly recorded data.
 “Fast” analog values (10 Hz)
• Substantial effort to acquire data in the LHC environment not to
• Magnet
protection
systems
be spoiled
easily.
• Systems treat signals significantly faster but transmit only during PM at full
speed (some kHz)
• On change recording of filtering not permitted
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Conclusion
 QPS supervision is an essential part of an important machine protection system
• Proper functioning cannot guaranteed without adequate data acquisition
• On change recording (or any kind of filtering) of analog data is not acceptable
• Data transmission rates might be slightly lowered in case of major problems
 QPS upgrades introduced during LS1 focus on:
• Reduction of system down time, improved reliability and system maintainability
• Remote maintenance options
• Configuration database
• Improved radiation tolerance
TE-MPE-EP, RD, 06-Dec-2013
• Enhanced supervision capabilities e.g. for quench heater circuits
• Automatic tools for system integrity checks
 Limitation by the high level control systems in handling the QPS data flow needs to
be understood
• Technology, manpower, hardware  where is the real bottleneck?
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