1. 352MHz Klystron Control for the 3MeV Linac test stand
New 352MHz Klystron control system based on LHC standard
21/10/2003
L. Arnaudon AB-RF-CS

2. Items covered General overview
Details of the Klystron and High Voltage control
What will be “under control”…
… and what will not be “under control”
A bit of planning, man-power and cost estimation
Conclusions … Q&A

3. General overview
The control system is based on Schneider PLC’s and some remote I/O connected with the FIPIO Field network.
The first PLC is controlling the Klystron parameters (PLC_L1) and the second is dealing with the HV Bunker and the Power Supply (PLV_HV).
Both PLC’s have Ethernet 10/100Mb connection and WEB service available.
The fast fault detection and interlock (HV and RF) is managed by a separate system.
Remote I/O

4. Details of the Klystron
Next to each Klystron there will be one control rack (see sketch) containing all the remote I/O and signal conditioning as well as some high power elements (Focus Ps, Filament heater ..)
All the RF cables will end on patch panels and RF measurements are done in this rack, with power meter boards.
This may change for pulsed operation.

5. Details of the High Voltage
Inside the HV Bunker there will be one control rack (see sketch) containing all the remote I/O and signal conditioning as well as the 230/400Vac distribution for the Klystron elements (Focus Ps, Blower and Vacuum pumps)
The Klystron Current, HT Voltage and current measurements are also done in this rack, with two DCCT devices.
For pulsed operation the HT modulator control has to be reviewed as well as the Klystron current measurements.

6. What will be “under control”
The Klystron
Cooling :
Blower control
Water temp and flow
Air temp and pressure
Filament heater
Focus Power Supply
Vacuum pumps
Drive Amplifier
Interlocks (HV and RF)
The High Voltage
General Mains distribution
Voltage Measurements
Modulator oil level and temperature
HV Switch control
Crowbar control
Power Supply
Voltage setting and control
Interlocks To/From RF
The function of this part of the control system is to bring the
Klystron to the level >> Ready for RF

7. What will not be “under control”…
Due to pulse operation we will have to change:
The HV modulator control
The RF power measurements
The Klystron current measurement
We will also have to perform some test on:
Power Supply control
Drive amplifier in pulsed operation
The synchronization of the data acquisition
The RF and HV pulse generation and all possible loop or low level control are not taken into account in this part of the control system.

8. A bit of planning, man-power and cost estimation
We will build the 352MHz Klystron control for the SM18 test stand by April 2004.
The system needed for the 3MeV Linac can profit from this design and production phase. (+/- some minor modifications)
The man-power for installation, cabling and tests has to be found (estimation 10 to12 weeks) also some commissioning time (estimation 2 to 3 weeks)
As a first estimation the cost would be:
One klystron control __________________________~32KCHF
HV bunker control for two klystron _______________~35KCHF
Front end control and data acquisition ____________ ~AB-CO

9. Conclusions …………….. Q&A
Looking at the project schedule and at the fact that we can profit from LHC design I do not see any major problem.
There are some points to clarify and more detailed planning to be elaborated for a final proposal.
Now time for questions ( if any! )