The PITZ Timing System
description
Transcript of The PITZ Timing System
24.9.2002
The PITZ Timing System
Frank TonischDESY - Zeuthen
24.9.2002 The PITZ Timing System, F.Tonisch 2
RF-Gun as an Electron Source
• Laser hits a cathode producing photo electrons
• Electrons are accelerated by a pulsed RF field in the gun cavity
• Laser and RF Source must be synchronized very precisely
• Required Phase Stability <1psrms
Ref: I.Bohnet, Technical Seminar held on 20.Feb.2001, Zeuthen
24.9.2002 The PITZ Timing System, F.Tonisch 3
PITZ Timing
• Burst structure– Number of pulse up to 800
– Pulse distance from 110ns (with a future Laser) to 1s (act. at PITZ)
– Repetition rate from 1Hz to 10Hz
Ref.: I.Will, MBI
24.9.2002 The PITZ Timing System, F.Tonisch 4
Timing for Low Level RF
DA
C
DA
C
AD
C
DSP System
I/QModulator
Amp
Clystron
1.3GHz-250kHz
From Timing Unit
From Timing Unit
1MHz
Gu
n
LP
1.3GHz
24.9.2002 The PITZ Timing System, F.Tonisch 5
Timing for Laser Operation
54MHz Pulse Train
1.3GHz (EOM)27MHz (AOM)
Ref.: I.Will, MBI
Start & Stop from Timer27MHz/27 for Pulse Gating
24.9.2002 The PITZ Timing System, F.Tonisch 7
To Laser, LLRF
}To Laser
1300MHz
108MHz
54MHz
27MHz
9MHz
RF-MasterOscillator Timing System
(Overview)
50Hz
RepRateGen
Var M
Var N
10Hz
0.1Hz
9MHz
~
ClockGen
ClockIn Out
A7
A6
A5
A4
A3
A2
A1
A0
To
Dia
gnos
tics
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
VME
24.9.2002 The PITZ Timing System, F.Tonisch 8
To Laser, LLRF
}To Laser
ClockGen
1300MHz
108MHz
54MHz
27MHz
9MHz
RF-MasterOscillator Timing System
(Overview)
To
Dia
gnos
tics
50Hz
RepRateGen
Var M
Var N
10Hz
0.1Hz
9MHz
~ ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
A7
A6
A5
A4
A3
A2
A1
A0
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
VME
24.9.2002 The PITZ Timing System, F.Tonisch 9
RF Masteroscillator
Masteroscillator: fM 9.027775MHz Timing
144*fM 1299.999600MHz RF, Laser
12*fM 108.333300MHz Streak Camera
6*fM 54.166650MHz Laser
3*fM 27.083325MHz Laser
x 3
x 2
x 2XPCRO(x 144)
4-WaySplitter
Amplifier108MHz
54MHz
9MHz
1300
MH
z
27MHz
Dou
ble
Loo
p P
LL
Direct Multplier
OCXO9MHz
24.9.2002 The PITZ Timing System, F.Tonisch 10
OCXO
• Oven Controlled Crystal Oscillator
• Frequency Stability:– Aging Rate/Day: 5*10-11
– Aging Rate/Year: 3*10-8
– Thermal Stability: 2*10-10
– Short Term Stability: 2*10-12
• Phase Noise (from Specification):– 1Hz -90dBc
– 10Hz -120dBc
– 100Hz -140dBc
– 1kHz -155dBc
– 10kHz -155dBc
– 100kHz -155dBc Frequency
Pow
er
fc
24.9.2002 The PITZ Timing System, F.Tonisch 11
Frequency Multiplier
• Direct Frequency Multiplaction on non-linear devices– Phase Noise Deviation: +20*log(N)+3dB
• or with PLL-Devices (Phase Locked Loop)– Phase Noise (from Specification):
• <100Hz +20*log(144)+3dB
• 100Hz -72dBc
• 1kHz -102dBc
• 10kHz -112dBc
• 100kHz -140dBc
24.9.2002 The PITZ Timing System, F.Tonisch 12
Integrated Phase Jitter
• Can be calculated from Phase Noise:
Ref.: W.P.Robins, Phase noise in signal sources, Peter Peregrinus Ltd, London, UK, 1084
BB
B
f
C
N
f
f C
Nrms df
fP
fPdf
fP
fP
0 )(
)(2
)(
)(
1 10 100 1 103 1 104 1 105200
150
100
50
0
Offset Frequency [Hz]
Pha
se N
oise
[dB
c/H
z]
Masteroscillator:
MOrms 1.881 103
deg
t MOjitter 5.789 1013
s
XPCRO:
XPCROrms 0.428 deg
t XPCROjitter 9.151 1013
s
24.9.2002 The PITZ Timing System, F.Tonisch 13
To Laser, LLRF
}To Laser
ClockGen
1300MHz
108MHz
54MHz
27MHz
9MHz
RF-MasterOscillator Timing System
(Overview)
To
Dia
gnos
tics
50Hz
RepRateGen
Var M
Var N
10Hz
0.1Hz
9MHz
~ ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
A7
A6
A5
A4
A3
A2
A1
A0
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
VME
24.9.2002 The PITZ Timing System, F.Tonisch 14
Repetition Rate Generator
• Operates on 50Hz AC line(zero crossing detector)
• Division by 5 gives 10Hz
• Further division
M N10Hz 10Hz M/1
5Hz M/22Hz M/51Hz M/100.5Hz M/200.2Hz M/50
0.1Hz 0.1Hz M/100
Outputsvariable
fixed
24.9.2002 The PITZ Timing System, F.Tonisch 15
To Laser, LLRF
}To Laser
1300MHz
108MHz
54MHz
27MHz
9MHz
RF-MasterOscillator Timing System
(Overview)
To
Dia
gnos
tics
50Hz
RepRateGen
Var M
Var N
10Hz
0.1Hz
9MHz
~ ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockGen
ClockIn Out
A7
A6
A5
A4
A3
A2
A1
A0
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
VME
24.9.2002 The PITZ Timing System, F.Tonisch 16
Clock Generator (I)
• IP-Module• Logic (on ACTEL chip)
containing:– IP Interface logic
– TCLK Decoder (Tevatron style clock)
– Serializer & Manchester Encoder
– Prioritizer for Decoded Events, Input latches & Computer Events
– Computer Event Latch
– 8 Input Latches
• Normally one module in the SystemRef: from Users Manual
24.9.2002 The PITZ Timing System, F.Tonisch 17
Clock Generator (II)
• Manchester Code– „0“ no transition in the
middle of the bit– „1“ transition in the
middle of the bit– allways transitions on bit
bounderies
• allow easily clock recovery
24.9.2002 The PITZ Timing System, F.Tonisch 18
Clock Generator (III)
• TCLK Events– 0xh; 1xh, 2xh from incoming clock
• Trigger Events– A7h-A0h, generated from inputs IN7-IN0
– B7h-B5h, generated from reference event A6h• B7h every 16th A6 with 6s delay
• B6h every 32th A6 with 9s delay
• B5h every 64th A6 with 12s delay
• Computer Events– C0h-CFh, writing to an internal register
24.9.2002 The PITZ Timing System, F.Tonisch 19
To Laser, LLRF
}To Laser
ClockGen
1300MHz
108MHz
54MHz
27MHz
9MHz
RF-MasterOscillator Timing System
(Overview)
To
Dia
gnos
tics
50Hz
RepRateGen
Var M
Var N
10Hz
0.1Hz
9MHz
~ ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
A7
A6
A5
A4
A3
A2
A1
A0
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
ClockIn Out
N7
N6
N4
N5
N3
N2
N1
N0
Timer
Out3
Out2
Out1
Out0
Del
ayG
ate
1MHz
9MHz
VME
24.9.2002 The PITZ Timing System, F.Tonisch 20
Timing Unit (I)
• IP-Module• Logic (on ACTEL chip
containing:– IP Interface Logic– TCLK Decoder (Tevatron style clock)– Serializer & Manchester Encoder– Prioritizer for Events– 4 16-bit Event Registers – 6 16-bit Delay counters– 8 16-bit Delay Registers & Comparators– 4 16-bit Control Registers
24.9.2002 The PITZ Timing System, F.Tonisch 21
Timing Unit (II)
• one Event & Control Register for 2 Delay Outputs at a time
24.9.2002 The PITZ Timing System, F.Tonisch 22
Timing Unit (III)
• 8 Delay Outputs
• Timebase 110ns (Prescale bit =0 ) or 1s (Prescale bit =1 )
• Pulse length control– 110ns , 800ns or 8s
• Daisy Chain Mode– Channel 2,3 (6,7) started by Channel 0,1 (4,5) resp. allowing for
long pulses
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Timing Unit (IV)
• 4 Gate Outputs– Gate 0 started with Out0 & removed with Out2
– Other trigger pairs:• Gate 1: 1-3
• Gate 2: 4-6
• Gate 3: 5-7
24.9.2002 The PITZ Timing System, F.Tonisch 24
Timing Control Comand(timingctr at corvus)
Author: B. Petrosyan