Grzegorz Jablonski, Technical University of Lodz, Department of Microelectronics and Computer Science XFEL-LLRF-ATCA Meeting, 3-4 December 2007 XFEL The

Grzegorz Jablonski, Technical University of Lodz, Department of Microelectronics and Computer Science

XFEL-LLRF-ATCA Meeting, 3-4 December 2007

XFELThe EuropeanX-Ray Laser Project

X-Ray Free-Electron Laser

Controller

for XFEL

2





Agenda

• Introduction/Purpose of the project

• Basic Requirements

• Structure of the Controller

• Functional features

• The controller against the background of the whole system

• Current status

• Test results

3





Introduction

4





Introduction

cryomodule cryomodule cryomodule cryomodule

5





Introduction


Adaptive Feed-Forward

System Identification

Loop gain and loop phase calculation

detuning and loaded Q calculation

Vector sum calibration

Exception Detection and Handling

Beam DiagnosticAutomated frequency tuning

...

6





Introduction


Low Level

Applications

High Level

Applications

Controller

Provide RF field control

Provide interfaces to other systems

7





Basic Requirements

The controller must provide RF power for RF station in the

controlled way, using different operation modes.

The supported operation modes are:

Normal mode used for control of the RF field with a given

precision

Measurement mode used for measurement of basic

parameters of a single cavity.

8





Basic Requirements

The controller must provide interfaces for algorithms and

applications implemented as part of other Work Packages.

These include:

Low Level ApplicationsHigh Level ApplicationsPiezo controlControl systemDiagnostics

9





Structure of the Controller

Field detection

module

Feedback

module

Output

module

To Vector Modulator

Cavity signals

Timing module

DAQ module

CTL module

Comm. Interface

Ext. Interfaces

The computation pipe of

the controller was divided

into 3 subcomponents

Additional components

provide means of

communication with the

external environment.

10





Structure of the Controller

Field detection

module

Feedback

module

Output

module communication links implemented using low

latency communication protocols

Each part of the controller can be implemented on

the separate board (or separate FPGA chip). The

field detection module can be duplicated to increase

input channel count.

The remaining peripheral controller modules are

duplicated as necessary for each location used for

implementation.

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Functional features

Field detection module includes:

– Field measurement

– Input linearization

– Field calibration

– Field I component detection

– Field Q component detection

– Components conversion to field amplitude

– Components conversion to field phase

– Measurement filtering

Feedback module includes:

– Field error calculation

– PID transfer function

– MIMO controller

Output module includes:

– Output linearization

– Correction tables

– Offset compensation

– Control signal adjustments

– Control signal limiters

– Loop phase adjustment

– Loop gain adjustment

– Output delay

The features can be used both in normal and

measurement mode.

Measurement mode provides such

functionality as SEL or Frequency Sweep

mode.

12





Against the background of the whole system

RF station

Controller

13






RF station

ControllerAs the field controller

14






RF station

Controller As the interface between

RF station and Low

Level Applications

Low Level App.

15






RF station

Controller

As the interface between

RF station and High

Level Applications

Low Level App. High Level App.

16






RF station

Controller


Control System and part of

Low Level Applications


Control System

17





Piezo Control


RF station

Controller


Piezo Control and part of

Low Level Applications


Control System

18





Current status

The prototype implementation of the controller presented above has been

running in ACC1 module for more than 12 months.

It has become the basis for the controller used in FNAL.

Several tests of the additional functionality were performed in ACC1

module and module test stand during accelerator study weeks.

The measurement mode of the controller will be tested in CHECHIA test

stand during next weeks.

The controller is also capable of CW (Continuous Wave) operation.

19





Test results – normal mode (IQ control)

Amplitude and phase of vector sum for IF=54MHz

ampl

itude

phas

e

time

20





Test results – normal mode (IQ control)

beam energy stability for IF=54MHz

21





Test results – normal mode (AQ control)

AQ control with feedback on amplitude only

ampl

itude

phas

e

time

22





Test results – Measurement mode (delay scan)

23





Test results – Measurement mode (SEL)

time

ampl

itude

phas

e

Documents

Grzegorz Jablonski, Technical University of Lodz, Department of Microelectronics and Computer Science XFEL-LLRF-ATCA Meeting, 3-4 December 2007 XFEL The