12 GHz High Power RF components requirements for CEA activities

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

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

3. 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: 50 MHz @ -3 dB • Efficiency: 40% • Gain: 50 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 • +/- 0.25 % amplitude Provided by CERN for October 2009 at SLAC • General specifications for high power 12 GHz components for Step 1: • Frequency: 11.9942 GHz +/- 50 MHz @-3 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

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: - 50 dB +/- 1dB • Directivity: - 30 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

5. Step 2 For March 2010 at CERN

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

7. Evaluation of the needed quantity for step 1&2 SLED2

8. Development and procurement plan

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

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: 11.994 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: 20-30 °C • Length: Lengths to be approved by CERN • Directional coupler specifications: • Coupling: - 50 dB +/- 1dB • Directivity: - 30 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)

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: 11.9942 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

12. Summary • TEST STAND: • 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)