lhc beam dump system technical audit trigger synchronisation unit
TRANSCRIPT
January 2008 CERN - A. ANTOINE 2/14
Topics
• Requirements • Architecture
– Timing unit– Dump request client interface– Dump request management– Supervision & Diagnostic
• Design
January 2008 CERN - A. ANTOINE 3/14
Layout (Reminder)
Fault-tolerantFail-safe Re-trigger lines
Branch A
BranchB
BranchA
BranchB
Generator 1
Generator 15
TFO
TFO
Trigger Fan-out
PTU
PTU
PTU
PTU
Power Trigger
Unit
RTB
RTB
RTB
RTB
Re-trigger Box
RTD
TSU
TSUClient Interface
Frev
Trigger Synchronisation
Unit
January 2008 CERN - A. ANTOINE 4/14
Requirements
• 3 µs beam abort gap synchronisation• RF-signal recovery capability• Multiple Dump request client detectors• Remote diagnostic• Fault tolerant behavior• Low failure rate (p = 5.52.10-10 / year)• Injection Kicker AGK window generation
January 2008 5/14
Dump Request Client Interface
Digital Phase Locked Loop
Dump Request Management
Timing Unit
Beam Revolution Frequency
Delay Adjustment
Supervisory&
Diagnostic
VME
TFO-A
TSU-A
10 MHzFrequency detector
DTPT TRGS
SBDT
TFO-B
SBDT
Non-Ambivalent State Relay
CurrentLoop
Detector
Dump RequestClients
RTB
ABDT
Architecture
DPDT : Dump Trigger Pulse TrainsTRGS : Trigger Request gate signalSBDT : Synchronous Beam Dump TriggerABDT : Asynchronous Beam Dump Trigger
Dump Request Client Interface
Digital Phase Locked Loop
Dump Request Management
Timing Unit
Beam Revolution Frequency
Delay Adjustment
Redundant TSU Communication
Supervisory&
Diagnostic
VME
TFO-A
10 MHzFrequency
detector
DTPTTRGS
SBDT
TFO-B
SBDT
Non-Ambivalent State Relay
CurrentLoop
Detector
Dump RequestClients
RTB
ABDT
TSU-B
Redundant TSU Communication
January 2008 CERN - A. ANTOINE 6/14
RFRevolutionFrequency
TSU&
TFO
Generator(PTU)
Magnet
δ1 δ2 δ3 δ4 δ5 δ6
251
Timing unitDelays
• δ1 : Transmission speed between RF transmitter & LBDS• δ2 : TSU delay & TFO with compensation delay• δ3 : f(Magnet position) = cable length delay adjustment• δ4 : f(Generator) = Turn on delay compensation• δ5 : cable length delay• δ6 : ceramic chamber effect delay
TSU with Configurable DelayTSU with Configurable Delay
δ1
January 2008 CERN - A. ANTOINE 7/14
Timing unitRF-signal transmission
• Optical Fiber Transmission• Optical / electrical conversion by AB/RF Rx & Tx board• ECL 5 ns / 1V / 50 Ω signal converted to CMOS by BT/EC• NO REDUNDANCY
ADPLL as clock recoveryADPLL as clock recovery
1
FO
ECLFO
EL
Tx Rx ConverterRF
RF LBDS
ECL
CMOSvolutionfRe
January 2008 CERN - A. ANTOINE 8/14
Timing unitADPLL
+
1Z
+
1Z
Boundaries11229.5Hz < f < 11253.3Hz
14
14
32
32
FromPhase
Detector ToINTERNAL
NCO
ToOUTPUT
NCO
(-)
1Phase Detector 2ADPLL
Controller
3NCO
INTERNAL
5NCO
OUTPUT4NCO Loader
BRF
SYNC_BRF
PFD
UP-14 BitCounter
N = 32
N = 32
Reset
)1()2(
)1(2
PLLPLL
PLL
KZKZ
ZK
NCLK
NCO
fWORDf
2
NCLK
NCO
fWORDf
2
MHzfCLK 100
0CLOCK
January 2008 CERN - A. ANTOINE 9/14
Dump Request Client• Based on CPLD technology in redundancy• Each CPLD is program by a different author• 3 different client interfaces :
– Hardware (outside CPLDs) :• Current loop
– Beam loss Monitor• Logical state detector
– Programmable logic Controller– Inject & Dump
– Firmware (inside CPLDs) :• Square wave frequency detectors
– Beam Interlock System– Beam Energy Tracking System
=> All dump requests issue LBDS Synchronous trigger & a one => All dump requests issue LBDS Synchronous trigger & a one turn delay (added by RTD) asynchronous triggerturn delay (added by RTD) asynchronous trigger
January 2008 CERN - A. ANTOINE 10/14
Dump Request ClientFrequency detectors
• 2 frequency detector types– Fast detector
• Detects signal activity within a short integration period (250 ns)• One missing pulse tolerant• Acts as a low-pass filter
=> No Frequency drift detection=> No Frequency drift detection– Slow detector
• Calculate the real input frequency• Long integration period (200 µs)
=> Frequency drift detection=> Frequency drift detection
January 2008 CERN - A. ANTOINE 11/14
Dump Request Management
• Discreet components• Synchronous & asynchronous trigger output• Local operation allowed (Test acceptance)• Supervision & Diagnostic unit management
Dump Request
Dump Request
Q
QSET
CLR
S
R
Record Sync Enable
ENB
Buffer
TFO - A
TFO - B
Buffer
RTDClient 1
Client 2
Enable
ENB
Dump Request
Local/Manual
January 2008 CERN - A. ANTOINE 12/14
Supervision & Diagnostic• Arming process (before injection allowed)
– Check all sub entities state– Initiate ADPLL pull-in process => Wait ADPLL lock
• Synchronisation check between TSU-A & TSU-B (See table)• Dump Request Management unit control• VME communication for remote diagnostic
TSU-A TSU-B Status Action
OK OK All OK nothing
OK FALSE TSU-B oscillator failureTSU-A Dump immediately
TSU-B disable its own dump request
FALSE OK TSU-A oscillator failureTSU-B Dump immediately
TSU-A disable its own dump request
FALSE FALSE Timing failure TSU-A & TSU-B dump after 5 cycles
January 2008 CERN - A. ANTOINE 13/14
Design
• VME crate implementation• 2 redundant electronic boards
with:– 1 CIBO interface (AB/CO - BIS)– 2 independent CPLD for the
dump request client interface– 1 FPGA for synchronisation,
supervision & communication– 1 Dump Request management
unit (Discrete components )– A VME interface
• VME backplane for crosscheck communication
• VME interface boards
CIBO FPGA
CPLD
DRM
VME