ANNEX

WP 1.04, Michael Ebert 2MAC PETRA-III Review Meeting, DESY,29th November 2006

Sandblasted Center Conductor of a Cavity Input Coupler

Ra = 1.651 µmRz = 9.46 µm

Ra = 2.164 µmRz = 11.9 µm

Ra = 1.994 µmRz = 11.6 µm

Ra = 0.624 µmRz = 3.82 µm

Ra = 0.380 µmRz = 3.00 µm

Ra = 0.338 µmRz = 2.05 µm

Simulation Rauhigkeit vor dem StrahlenRz=3,8µm; Ra=0,66µm

-6,00

-4,00

-2,00

0,00

2,00

4,00

6,00

0 50 100 150 200

Messstrecke

Z [

µm

]

Simulation Rauhigkeit nach dem Strahlen Rz=10,3µm; Ra=1,9µm

-6,00

-4,00

-2,00

0,00

2,00

4,00

6,00

0 50 100 150 200

Messstrecke

Z [

µm

]

Before Sandblasting After Sandblasting

Ra: Mittenrauwert, average surface roughness

Rz: Rautiefe, rouhgness depth

WP 1.04, Michael Ebert 3MAC PETRA-III Review Meeting, DESY,29th November 2006

Coupler Conditioning

RF-Power [kW], Klystron-HV [kV]

Klystron Drive Power [W], Cavity-Vacuum [mbar]

Traditional Conditioning Method New Conditioning Method

Two Hours Samples of

WP 1.04, Michael Ebert 4MAC PETRA-III Review Meeting, DESY,29th November 2006

Coupler Conditioning Arc-Detector vs Vacuum-Interock

FMFrequency Deviation: 100 kHzModulation Frequency: 400 Hz

163 ms

3*10-8 mbar

1*10-6 mbarVacuum Pressure

Ârc-Detector Signal

Coupler Forward Power

WP 1.04, Michael Ebert 5MAC PETRA-III Review Meeting, DESY,29th November 2006

RF Control Loop & LLRF

In order to suppress amplitude and phase modulation noise at the klystron rf output a fast I/Q rf-loop is foreseen. The expected noise suppression is 60dB@300Hz, 40dB@3kHz, 20dB@30kHz, 6dB@300kHz. For compensating beam loading and temperature influence on phase and amplitude of the cavity voltage a second control loop is foreseen. The hardware of both loops is identical in order to keep the number of different components minimal.

Status:

• Function of KWPC was proven using a single klystron transmitter and a standard desktop PC.

• Prototypes of the essential rf-loop components have been built and tested.

• Function of the fast I/Q rf-loop was proven at a single klystron transmitter.

Outlook:

• KWPC algorithm must be extended for a two-klystron transmitter and adapted to the ELWIS-Hardware

• Series rf-loop components must be built.

• Function of the rf-loops must be proved together with the KWPC.

• Test is scheduled for February 2007

In order to run the klystron over the full output power range close to saturation and at highest efficiency a Klystron Working Point Controller (KWPC) was developed. The KWPC is a PXI-PC with ADC inputs for measuring the required klystron output power Pin, the present klystron output power Pout and the present drive power Pdrv. DAC outputs are available for setting the correct drive, beam current and cathode voltage via the voltage controlled attenuator, anode power supply and cathode voltage supply. The optimum values of klystron voltage, current and drive for any klystron output power are stored in a look-up table of the KWPC. The table values are optimized during klystron operation by an additional algorithm which changes successive and marginal klystron voltage, current and drive for best efficiency.

WP 1.04, Michael Ebert 6MAC PETRA-III Review Meeting, DESY,29th November 2006

Waveguide Shutters

WP 1.04, Michael Ebert 7MAC PETRA-III Review Meeting, DESY,29th November 2006

Typical Structure of our RF-Systems

14 Electronic Racks

HV Cabinet

12 Cavities

Klystron

Circulator

Load

60 terminal

strips

signal converters, comparators, control electronics, displays, tell-tales,…

250 relays & power

contactors

jumble of cables &

plugs

2000 wires

~80

Crate

s

>200

Plug

s

WP 1.04, Michael Ebert 8MAC PETRA-III Review Meeting, DESY,29th November 2006

WiringConventional vs. ELWIS

actorsignalcond.

DAC

controller

sensorsignalcond.

ADC

controller

routerdeviceserver

actor

sensor

electronicboard

electronicboard

deviceserver

boardcrateterminal strips

terminal strip

terminal strip

Rack

Rack

Conventional

ELWIS

WP 1.04, Michael Ebert 9MAC PETRA-III Review Meeting, DESY,29th November 2006

Available Inputs/Outputs

Provided in/out channels of one ELWIS-Module

• 12 digital inputs (24V, optical coupled)

• 4 digital outputs (60V, 3A optical coupled)

• 8 digital outputs (optionally 60V, 3A optical coupled or power contactors)

• 2 arc detector inputs (optionally rf-rfl. detector)

• 4 analog outputs (-10V…+10V, dc…30Hz galvanic isolated)

• 10 temperature sensor inputs (PT-100)

• 6 analog inputs (-10V…+10V, dc…30Hz galvanic isolated)

• 8 analog inputs (optionally 500MHz, 30dBm or -1V…+1V, dc…3MHz)

WP 1.04, Michael Ebert 10MAC PETRA-III Review Meeting, DESY,29th November 2006

originallyELWOMIS

What does ELWIS mean?

Acronym:

Eier legende Woll-Milch-Sau

egg-laying wool-milk-sow

ELWomIS

All-in-one device suitable for every purpose