Diagnostic System for Low Level RF Control System for VUV-FEL

Diagnostic System for Low Level RF Control System for VUV-FEL

Technical University of Łódź, PolandDeutsches Elektronen-Synchrotron, Germany

Tomasz Jeżyński

Outlook

• VUV-FEL • LLRF• Source of perturbations• Diagnostic System for LLRF

LLRF WorkshopCERN 12.10.2005

Tomasz Jezynski

VUV-FEL - the pilot facility for the XFEL

• 260 m long (tunel 100 m)• 6 Cryo-modules• TESLA technology

– 48 superconductive cavities• Development platform for XFEL


Tomasz Jezynski

Tunnel

Place for electronic

• no access during operation

• no service tunnel• risk of radiation

damage


Tomasz Jezynski

Outlook



Tomasz Jezynski

Control System in VUV-FEL

~MO

Cavities

. . .

DSP

HP AmplifierRF

Switch

. . .Downconverters

DAC

DAC

VM

ADC

ADC...7

8

Control System


Tomasz Jezynski

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


Tomasz Jezynski

LLRF– Goals

Provide:

1. stable RF field in cavity during beam2. 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]


Tomasz Jezynski

Outlook



Tomasz Jezynski

Source of perturbationSoftwareHardwareHardware

• MO – phase• VM – Pin, nn• Klyston – Pout = f(Pin)• RF Power distribution• Probes – individual char• Mixers – nn, offset• ADCs – nn, offset• DACs – nn, offset• Timing – time & temp.• Power Supplies• Noise level• ...

Software

• Numerical errors • Calibration• Parameters• Control System• ...


Tomasz Jezynski

Outlook



Tomasz Jezynski

Diagnostic System - Goals

The diagnostic system cannot increase reliability!

but can decrease maintenance cost(minimize time and man power necessary to repair)

provide the high availability


Tomasz Jezynski

Diagnostic System - Goals

Diagnostic have to be:

• Cheap• Flexible (easy modification, extend...)• Failures of diagnostic cannot stop

operation


Tomasz Jezynski

Monitoring

~51 32 4

...

MO

Cavities

. . .

DSP

HP AmplifierRF

Switch

. . .Downconverters

DAC

DAC

VM

ADC

ADC...7

8

Control System

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 yFla tto p

P[M V/m ]

tim e [us]


Tomasz Jezynski

Phase between two points in time

0 50 100 150 200 250 3006

8

10

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18

20


Tomasz Jezynski

400 500 600 700 800 900 1000 1100 1200 1300 14006860

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400 500 600 700 800 900 1000 1100 1200 1300 14006860

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400 500 600 700 800 900 1000 1100 1200 1300 14006860

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400 500 600 700 800 900 1000 1100 1200 1300 14006820

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400 500 600 700 800 900 1000 1100 1200 1300 14006820

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400 500 600 700 800 900 1000 1100 1200 1300 1400-160

-155

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-145

-140

-135

-130

-125

0 500 1000 1500 2000 25000

1000

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5000

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7000


Tomasz Jezynski

Unacceptable data from the system

0 500 1000 1500 2000

100

110

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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]


Tomasz Jezynski

Diagnostic

. . .

DSP

HP Amplifier

Cavities

RFSwitch

~

. . .Downconverters

DAC

DAC

VM

ADC

ADC

51 32

...6

4

MO

Control System

78

DAC

DAC

Tests:• Hardware

• Algorithm


Tomasz Jezynski

Diagnostic & Calibration

. . .

DSP

HP Amplifier

Cavities

RFSwitch

~

. . .Downconverters

DAC

DAC

VM

ADC

ADC DAC

DAC

Sig. Gen.

51 32

9 ...

8

7

4

6

MO

Control System

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]

2000 3000 4000 5000 6000 7000 8000-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8


Tomasz Jezynski

10 x ADC,14 bits,

105 MMz

4 x DAC,14 bits,

200 MMz

Digital IO

2 x optolink 3.125 Gbps

Ethernet


Tomasz Jezynski

Main panel - first result (timing)

Timing requires dedicated hardware !


Tomasz Jezynski

Diagnostic System for VUV-FEL

• Monitoring • Diagnostic• Calibration


Tomasz Jezynski

Monitoring

Error detection Timing signals (synchronization, phase) Pfor & Pref Probes Field stability (RMS, p-p, ...) Detuning Loaded Q Limits of set value ...


Tomasz Jezynski

Diagnostic

• Detect malfunction• Locate damage hardware

– Crate, board, input• Perform components tests

– ADCs, DACs– Interfaces– Memory, DSP blocks ...– Timing distribution

• ...


Tomasz Jezynski

Calibration

• timing• probes• vector sum• ADCs and DACs offset• downconverter• attenuators• .....


Tomasz Jezynski

What we want to do?

• Provide possibility to read data form different points of the system

• Design an universal diagnostic interface and implement it to all electronic boards

• Integrate diagnostic elements in control system– Sources of test signals– RF Switches– ...

• Provide self-diagnostics for all boards


Tomasz Jezynski

THE END

Documents

Diagnostic System for Low Level RF Control System for VUV-FEL