Transcript Requirements for diagnostic for EU-XFEL Tomasz Jeżyński Technical University of Łódź, Poland

Requirements for diagnostic for
EU-XFEL
Tomasz Jeżyński
Technical University of Łódź, Poland
Deutsches Elektronen-Synchrotron, Germany
Outlook
EU-XFEL
 VUV-FEL
 Proposal for diagnostic

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EU-XFEL – Light Source
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EU-XFEL
~2000 superconductive cavities
 Length : 2100 m
 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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VUV-FEL - the pilot facility for the XFEL
260 m long (tunel 100 m)
 5 Kyro Modules
 40 superconductive cavities
 TESLA technology
 Development platform for XFEL

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Measurements points in LLRF
15
15
10
10
5
5
0
0
500
1000
1500
2000
0
2500
0
500
1000
1500
2000
2500
phase [ deg]
-120
mean value
15
standard
deviation
Flattop
P
[MV/m ]
-140
100
200
300
400
500
600
700
800
900
Fillin
g tim
e
ay
-160
0
c
De
10
5
1000
t [pulse no.]
0
0
500
1000
1500
2000
tim e [us]
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2500
VS and signal from single cavity
10
P9
[MV/m ]
Vec tor sum
8
7
6
5
4
3
1
0
Filling
tim e
2
Flattop
500
1000
1500
2500
Dec ay
Cavity 1
tim e [us]
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Mean & std. of measured signals (VS)
phase [ deg]
-120
mean value
standard
deviation
-140
-160
0
100
200
300
400
500
600
700
800
900
1000
t [pulse no.]
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Field Phase in Vector Sum
4
std [ deg]
mean phase [ deg]
-150
2
-155
Mean
Value
-160
0
0
2
1
time [hours]
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LLRF in VUV-FEL
DOOCS
Server
VM
MO
Pream.
I
DOOCS
Server
Amplifier
Q
TM
DOOCS
Server
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Controller
DAC
DAC
1
DAC
Board
2
DSP
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ADC Board
32
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Gen.
Diagnostic for VUV-FEL
DOOCS
Server
VM
MO
Pream.
I
DOOCS
Server
Q
Amplifier
RF
Switch
TM
DOOCS
Server
Gen.
Controller
DAC
DAC
Data
analysis
1
DAC
Board
2
DSP
ADC Board
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Ac c ess to internal data in the boards
Read / write possible
Diagnostic system
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Diagnostic of LLRF - Goals

Provide continuous operation of LLRF
System

Reduce maintenance cost
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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 for EU-XFEL
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
 ...
 Pizo
tuning
 ...
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ADC Board and diagostic element
Programable
Generator
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Board with integrated diagnostic elements
Program able
Generator
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Future Downconverter
Program able
Generator
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Recomendation
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
It is possible to predict operation
interrupt before it happens (?)
The diagnostic system should be integrated
with control system and hardware
Base on experience from TTF and VUV-FEL
the diagnostic system will decrease maintenance cost
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END
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