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

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

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: 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 F. Peauger

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 F. Peauger

Step 2 For March 2010 at CERN F. Peauger

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

Evaluation of the needed quantity for step 1&2 B 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 Φ50 -90 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

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 Φ50 -90 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

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

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) F. Peauger

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 F. Peauger

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