Performance Degradation of the Low Level RF Control System for VUV-FEL
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Performance Degradation of the Low Level RF Control System for VUV-FEL Technical University of Łódź, Poland Deutsches Elektronen-Synchrotron, Germany Tomasz Jeżyński
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Performance Degradation of the Low Level RF Control System for VUV-FEL. Tomasz Jeżyński. Technical University of Łódź , Poland Deutsches Elektronen-Synchrotron, Germany. Outlook. VUV-FEL LLRF Source of perturbations Proposal for diagnostic. VUV-FEL - the pilot facility for the XFEL. - PowerPoint PPT Presentation
Transcript of Performance Degradation of the Low Level RF Control System for VUV-FEL
Performance Degradation of the Low Level RF Control System for VUV-FEL
Technical University of Łódź, PolandDeutsches Elektronen-Synchrotron, Germany
Tomasz Jeżyński
MIXDES, Krakow, 2005 Tomasz Jeżyński 2
Outlook
VUV-FEL LLRF Source of perturbations Proposal for diagnostic
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VUV-FEL - the pilot facility for the XFEL
260 m long (tunel 100 m) 6 Kyro Modules TESLA technology
48 superconductive cavities Development platform for XFEL
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Kyro module
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Inside the tunnel
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Tunnel
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Low Level Radio Frequency – Goal(s)
Provide stable RF field in cavity during beam
• continuous operation
0 500 1000 1500 2000 25000
5
10
15
Fillin
g ti
me
De c a y
Fla tto pP
[M V/m ]
tim e [us]
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LLRF - requirements
Electrical field : 30 MV/m Required field stability :
10-5 in amplitude, 0.01° in phase Continuous operation is required
one maintenance day per month
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Low Level Radio Frequency System
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Source of perturbation
MO – phaseVM – Pin, nnKlyston – Pout = f(Pin)RF Power distributionProbes – individual charMixers – nn, offsetADCs – nn, offsetNumerical errorsDACs – nn, offsetTiming – time & temp.SuppliesNoise
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Diagnostic of LLRF - Goals
Provide continuous operation of LLRF System
Reduce maintenance cost
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Measurements points in LLRF
0 500 1000 1500 2000 25000
5
10
15
0 500 1000 1500 2000 2500
0
5
10
15
0 1 0 0 2 0 0 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 1 0 0 0-1 6 0
-1 4 0
-1 2 0
t [pu lse no.]
ph
ase
[ d
eg]
standarddeviation
m ean va lue
0 5 0 0 1 0 0 0 1 5 0 0 2 0 0 0 2 5 0 00
5
1 0
1 5
Fillin
g tim
e
De c a y
Fla tto pP
[M V/m ]
tim e [us]
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VS and signal from single cavity
500 1000 1500 25000
1
2
3
4
5
6
7
8
9
10
Fillin
g ti
me
De c a y
Fla tto p
P[M V/m ]
tim e [us]
Ve c to r sum
C a vity 1
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Mean & std. of measured signals (VS)
0 1 0 0 2 0 0 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 1 0 0 0-1 6 0
-1 4 0
-1 2 0
t [pu lse no.]
ph
ase
[ d
eg]
standarddeviation
m ean va lue
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Field Phase in Vector Sum
0 1 2-160
-155
-150
tim e [hours]
me
an
[ d
eg
]
p
ha
se
M eanValue
std
[ d
eg
]
2
4
0
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Unacceptable data from the system
0 500 1000 1500 2000
100
110
120
130
140
150
160
170
180
tim e [us]
pha
se [
de
g]
0 5 0 0 1 0 0 0 1 5 0 0 2 0 0 0 2 5 0 00
5
1 0
1 5
Fillin
g tim
e
De c a y
Fla tto pP
[M V/m ]
tim e [us]
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LLRF in VUV-FEL
ADC Bo a rd
1
2
32DSP
D A C
D A C
DACBo a rd
C o n tro lle r
Am p lifie rPre a m .
I Q
M O VM
TMDO O C SSe rve r
DO O C SSe rve r
DO O C SSe rve r
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Diagnostic for VUV-FEL
R FS w itc h
ADC Bo a rd
1
2
32DSP
D A C
D A C
DACBo a rd
C o n tro lle r
Am p lifie rPre a m .
I Q
M O
Ac c e ss to inte rna l d a ta in the b o a rd sRe a d / write p o ssib le
VM
TMDO O C SSe rve r
Da taa na lysis
D iag n o s tic sy s tem
Gen
.
DO O C SSe rve r
DO O C SSe rve r
G e n .
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What we know about EU-XFEL ?
What we know? Technology is unknown Structure (distributed? links?) Algorithms (under development)
Diagnostic have to be: Cheap Flexible (easy modification, extend...) Integrated with system
• But, failures of diagnostic cannot stop operation
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Proposal for diagnostic
Monitoring Diagnostic Calibration
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Monitoring
Error detection Timing signals (synchronization, phase) Pfor & Pref Probes Field stability (RMS, p-p, ...) Detuning Loaded Q Limits of set value ...
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Diagnostic
Detect malfunction Locate damage hardware Perform components tests
ADCs, DACs Interfaces Memory, DSP blocks ... Timing distribution
...
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Calibration
Timing Correction of parameters
Probes Downconverters ADCs & DACs offset ...
Piezo tuning ...
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Recommendations
Provide possibility to read data form different points of the system
Design the universal diagnostic interface and implement it to all electronic boards
Integrate diagnostic elements in control system Sources of test signals RF Switches ...
Provide self diagnostic for all boards
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Conclusion
Base on experience from TTF and VUV-FELthe diagnostic system will decgrease maintenance cost
The diagnostic system should be integrated with control system and hardware
It is possible to predict operation interrupt before it happens
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END
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Measurements points in LLRF
