1. Manipulating RF phase and amplitude at high power level.
Past, present and future.
I. Syratchev

2. Generic RF power manipulating circuits
Variable phase shifter L
Exp(j0)
Variable power splitter
Movable short circuit L
Exp(j0)
3dB hybrid
0->1
Exp(j(0+Lx/)
1->0
Exp(j0+/2)
Exp(j(0+Lx/)
‘Classical’ movable short circuits. Do not work at high RF power!
Design of ‘RF contact-free’ movable short circuit is the main challenge.

3. Year 2008. Designed and fabricated by GYCOM (Russia)
Splitter measurements
Variable (2) RF phase shifter
3-dB hybrid
Variable RF power splitter
H10-H01 mode converter
Short circuit part
Both devices operated at high power level in TBTS until late However, 10% insertion losses, narrow bandwidth and complicated design (fabrication cost) never made us satisfied.

4. Mode converter build by CEA piston
Year First compact high power movable short circuit design (Syratchev/Cappelletti)
Compact H10□-> H20 □ ->H GHz mode convertor (original idea by S. Kazakov, KEK in 2003)
E-field
H-field
H01
H20□
H10□
Mode converter build by CEA
piston
The use of the compact mode converter allowed to reduce dramatically the length of device. However bandwidth was still narrow to be compatible with CLIC PETS ON/OFF needs.

5. extremely broad band (~1 GHz)
Year Ultra compact high power movable short circuit and variable reflector designs (Syratchev).
Full reflection
Full transmission
RF filter
Radiation through the filter
extremely broad band (~1 GHz)
low surface electric field (< 45 MV/m at 150 MW)
reduced actuators stroke (~l/4)
contact-free

6. The variable RF short circuit
The variable RF reflector and short circuit.
OFF
The variable RF short circuit
Reflection
Transmission
Bold line – measured
Thin line -HFSS ON

7. Modification of the TBTS PETS tank layout in 2011.
The movable compact RF short circuit was successfully tested in TBTS at power levels well above 150 MW.

8. Year 2013. 3dB ‘cross’ hybrid. 3 ports; 4 modes
Inspired by the work done by:
Year dB ‘cross’ hybrid. 3 ports; 4 modes
Transmission
C. Chang, S. Tantawi SLAC
Reflection
S. Kazakov, KEK
Rotating TE11 A1 A2

9. 450
Magic-T
A1/20.5 x e(j)
A1/20.5
A1/20.5 x e(j0)
A1/20.5

10. Rotating modes launcher. Practical design.
Reflection
Transmission
Ultra compact 3dB hybrid design by A. Grudiev

11. Variable splitter
#1->#2
#1->#3 #1 #2 #4 #3

12. To come in year 2014. Most compact variable splitter (personal choice)
Most compact design.
Components (not a hybrid yet) high power tested.
We have enough experience with operating the system with two independent pistons.

13. Where would we need them?
XBOX 1,2 layout before
Where would we need them?
RF load
klystron
Pulse compressor
They will allow to process two structure in parallel in the most convenient way, when each of the structure will receive personal RF power handling
They could operate as a part of processing procedure (in the case of the structure breakdown), thus minimising transient thermal load in the pulse compressor.
XBOX 1,2 layout after
Variable splitters
Anticipating final testing capability of 8 structures (XBOX #1,2,3), 8 power splitters will be needed
It will be also useful to replace the old GYCOM devices in CLEX, then 2 more splitters are needed.
With 1-2 spare, we should plan to fabricate ~ 12 such device.

14. Dynamic symulations results by MMT
Stay tuned. Fast (<20 ms) actuators are under development in RF/PM section
Two vacuum compatible prototypes are at CERN.
The RF network is in preparation.
Dynamic symulations results by MMT