1. 12 GHz High Power RF components requirements for CEA activities
F. Peauger – 5 Nov. 2008
12 GHz klystron Test Stand
TBL
CLIC Module
see Karl’s talk
see Steffen’s talk
No needs except RF flanges and rect. waveguides
F. Peauger

2. 12 GHz Test Stand
We split the 12 GHz Test Stand activity in two steps:
Step 1: XL5 Klystron testing at SLAC and CERN
- RF components must be sent at SLAC in October 2009
Step 2: Accelerating structure testing without and with pulse compressor
- RF components must be ready at CERN in March 2010
F. Peauger

3. Provided by CERN for October 2009 at SLAC
Step 1
The objective is to test the new XL5 klystron at full specification:
Output power:
50 MW peak
3.75kW average
Pulse length / rep rate: 1.5 µs / 50 Hz
Bandwidth: dB
Efficiency: %
Gain: dB
klystron pulse failure (arcs): ≤ 1 in 14 hours
RF power in harmonics: < -30dB
Matching load: < 1.15 VSWR
Stability of RF output signal:
+/- 0.5 RF deg
+/ % amplitude
Provided by CERN for October 2009 at SLAC
General specifications for high power 12 GHz components for Step 1:
Frequency: GHz +/- 50 dB
Pulse length and rep rate: 1.5 µs, 50 Hz
VSWR: < 1.15
Waveguide: WR90, OFE copper
Vacuum: 1x10-10 l/s leak rate for Helium
Flange: SLAC type vacuum RF flange, stainless 316 LN
Possible Baking out: up to 300 °C
F. Peauger

4. Particular specifications of RF components for Step 1
Hybrid splitter specifications:
Max. Power: 50 MW peak, 4 kW average to handle
Coupling: - 3 dB, 90 degrees
Flanges: Male (x4)
RF Load specifications:
Max power: 25 MW peak, 2 kW average to dissipate
Cooling: Connections, pressure and flow rate to be specified, water temp between 20 – 30 °C
Flanges: Male
Directional coupler specifications:
Max. Power: 50 MW to handle
Coupling: dB +/- 1dB
Directivity: dB
Flanges: one male, one female vacuum flange, WR90 instrument flange at low power side
Rectangular Pumping port specifications:
Max. Power: 50 MW to handle
Isolation of pumping port from RF: < - 50 dB
Conductance: To be specified
Connection to pumping system: UHV CF Flanges, diameter to be specified
F. Peauger

5. Step 2
For March 2010 at CERN
F. Peauger

6. Specifications of RF components for Step 2
General specifications for Step 2:
→ Same as general specs for Step 1 except for peak power:
Max. Power and pulse length: from 50 MW/1.5 µs to 150 MW/300 ns
Mode converter specifications:
Input/output modes: TE10□ rectangular WR90 / TE01○ circular Φ50 mm
Flanges: one male (rectangular, SLAC type), circular to be specified
Vacuum RF Valve specifications:
Input/output modes: TE01○ circular Φ50 mm
Transmission losses: 1% max
Flanges: circular flange to be specified
Circular Pumping port specifications Ф50 and Ф90 mm:
Isolation of pumping port from RF: < - 50 dB
Conductance: To be specified
Connection to pumping system: UHV CF Flanges, diameter to be specified
F. Peauger

7. Evaluation of the needed quantity for step 1&2B C D
Max(A,B)+C+D
Components
Symbol
Quantity for klystron testing at SLAC or CERN (step 1)
Quantity for Test Stand with SLED2 (Step 2)
Spare
Redundancy for preparation of 2 additional structures in parallel
TOTAL
Directional coupler WR90 DC 1 4 2 7
Rectangular pumping port WR90
RPP 3 9
RF Load WR90
RFL 8
3 dB hybrid splitter 90°WR90 HC -
TE10□ to TE01○ mode converter WR90-Φ50 mm MC 6
Circular pumping port Φ50 mm
Φ50CPP
~12
Circular waveguide Φ50 mm
TBD
RF valve
RFV
Hybrid Tee HT
Circular Iris Φ50 mm CI
Circular taper Φ mm CT
Circular pumping port Φ90 mm
Φ90CPP
Circular waveguide Φ90 mm(3m long) CW 28
Variable short circuit
VSC
Straight rectangular waveguide WR90
E bend rectangular waveguide WR90
H bend rectangular waveguide WR90
SLED2
F. Peauger

8. Need to start 3D implantation
Development and procurement plan
Components
TOTAL needed
STATUS
ACTIONS
Directional coupler WR90 7
Available at CERN (GYCOM – Russia) -
Rectangular pumping port WR90 9 ?
RF Load WR90 8
Will be available at CERN (CERN design)
3 dB hybrid splitter 90°WR90 1
Available at CERN (CERN design)
TE10□ to TE01○ mode converter WR90-Φ50 mm
Exist at ≠ Φ at 12GHz in Russia and at 11.4 GHz at SLAC
Ask SLAC to design at 12GHz and/or to provide the mechanical drawings of the 11.4 GHz one
Circular pumping port Φ50 mm
~12
Available at CERN from 30GHz test stand
Circular waveguide Φ50 mm
TBD
RF valve 2
Exists at 30 GHz at CERN and 11.4 GHz at SLAC
CEA could do the design at 12 GHz
Ask SLAC to provide the mechanical drawings of the 11.4 GHz one
Hybrid Tee 3
Circular Iris Φ50 mm
Do not exist
To be developed
Circular taper Φ mm
Circular pumping port Φ90 mm
Circular waveguide Φ90 mm(3m long) 28
Variable short circuit
Straight rectangular waveguide WR90
Need to start 3D implantation
E bend rectangular waveguide WR90
H bend rectangular waveguide WR90
F. Peauger

9. Additional aspects Rectangular flanges: WR90, vacuum tight
SLAC type or new CERN type ?
Thermal stabilization of the components ?
Baking out of the components ?
F. Peauger

10. Scope of the delivery for TBL
Purchase and delivery of 12 GHz RF components for 8 PETS in TBL (2008 – 2009)
16 RF loads: 80 MW – 140 ns – 5 Hz
8 Directional couplers
16 WR90 waveguide bends (90°) (H or E bends, to be confirmed)
General specifications:
Frequency: GHz +/- 100 MHz
Max. Power: 80 MW, 140 ns, 5 Hz
VSWR: 1.15:1 max
Waveguide: WR90, OFE copper
Vacuum: 1x10-10 l/s leak rate for Helium
Flange: SLAC type vacuum RF flange, stainless 316 LN
High power loads specifications:
Flanges: Male vacuum flange
Water cooling: Connections to be specified, water temp: °C
Length: Lengths to be approved by CERN
Directional coupler specifications:
Coupling: dB +/- 1dB
Directivity: dB
Flanges: one male, one female vacuum flange, WR90 instrument flange at low power side
Length: 30 – 50 cm (layout to be approved by CERN)
F. Peauger

11. Scope of the delivery for CLIC Module
Purchase and delivery of three accelerating structures with wakefield monitors (2008 – 2010)
3 structures, 4 RF ports per structures = 12 RF ports (RF port = rect. wg + flange)
General specifications:
Frequency: GHz
Max. Power: 80 MW, 140 ns, 5 Hz
Waveguide: WR90, OFE copper
Vacuum: 1x10-10 l/s leak rate for Helium
Flange: SLAC type vacuum RF flange, Female, stainless 316 LN
F. Peauger

12. Summary TEST STAND: TBL: CLIC MODULE:
RF and mechanical design (or modification) of 12 GHz TE01 Mode Converters (Ф50), and fabrication of 7 units
based on 11.4 GHz SLAC design (which has been debugged and work well) → need contact and eventually drawings
Russian solution as an alternative (but Ф adaptation needed)
RF and mechanical design (or modification) of 12 GHz RF valve (Ф50), and fabrication of 2 units
based on 11.4 GHz SLAC design (which has been debugged and work well) → need contact and eventually drawings
SLED2: full development (BOC solution in option)
Rectangular pumping ports and hybrid Tee have to be discussed
3D implantation to be done quickly to evaluate the quantity of rectangular waveguides (straight and bends) and flanges
TBL:
Fabrication of 16 RF loads
CERN design or CML: → need eventually drawings to start call for tender
Purchase of 8 directional couplers (GYCOM or CML)
Fabrication of 16 waveguide bends
CLIC MODULE:
need to know which flange to be used (also for TBL and TEST STAND)
F. Peauger