1. germana.riddone@cern.ch 02-Dec-2010 1 XB-10 02-Dec-2010 XB-10 Engineering design, production and follow-up of X-band RF components G. Riddone in collaboration with M. Filippova, I. Syratchev, A. Solodko, A. Olyunin, H. Tiainen, I. Kossyvakis

2. germana.riddone@cern.ch 02-Dec-2010 2 XB-10 OVERVIEW ° Introduction ° Current needs ° Status of RF components - High power loads - Bi-directional couplers - Phase shifters - Variable Power Attenuators - Splitters - Hybrids ° MTF ° Database of RF components ° Conclusions

3. germana.riddone@cern.ch 02-Dec-2010 3 XB-10 The CLIC RF frequency has been changed in 2007 from the initial 30 GHz to the European X-band 11.9942 GHz permitting beam independent power production using klystrons for accelerating structure testing. RF components have been designed to operate with microwave radiation at frequency from 11.424 to 11.9942 GHz. under vacuum conditions (5·10 -9 mbar) helium leak tightness better than 10 -9 mbar  l/s The design of the RF components (high power loads, bi-directional couplers, X-band splitters, hybrids, phase shifter, variable power attenuators) and main test results are presented. INTRODUCTION

4. germana.riddone@cern.ch 02-Dec-2010 4 XB-10 SUMMARY OF NEEDS RF components are needed for several test stands: Two-beam test stand (TBTS), Stand-alone test stand (SATS), Test beam line (TBL), KEK (JP), SLAC (US), PSI (CH), Sincrotrone Trieste (IT). The list of RF components with related needs are given in the table below: ComponentSuppliersTBTSSATSKEKSLACTBLPSI- XFEL ST- XFEL High-power loads [40]CINEL (IT) 72421834 Heeze (NL) VDL (NL) Cobham (UK) Directional couplers [32]Gycom (RU) 52 11455 Cobham (UK) Nikoha (JP) IHEP (CN) Splitters [10]VDL (NL) 41 1 22 Hybrids [2]CINEL (IT) 2 IHEP (CN) VPA [2]Gycom (RU) 2 Phase shifter [1]Gycom (RU) 1

5. germana.riddone@cern.ch 02-Dec-2010 5 XB-10 TEST STANDS (1/2)

6. germana.riddone@cern.ch 02-Dec-2010 6 XB-10 TEST STAND (2/2)

7. germana.riddone@cern.ch 02-Dec-2010 7 XB-10 HIGH POWER DRY LOADS Internal shape Broadband: 11.4 GHz and 12 GHz (design made by CERN) Ferritic stainless steel SS430 ripple shape tolerance = 0.01 mm flatness accuracy 0.01 mm ripple shape roughness Ra 0.4. RF measurements -28.5 dB 11.424 GHz -36.3 dB 11.994 GHz Design (HFSS): -39.5 dB 11.424 GHz -30.7 db 11.992 GHz Successfully tested at high power at KEK L ~ 0.8 m

8. germana.riddone@cern.ch 02-Dec-2010 8 XB-10 HIGH POWER COMPACT DRY LOADS Water cooled load Ceramic (SiC) - 3 mm Cu coating needed Ceramic (SiC) - 3 mm Cu coating needed Cu OFE body brazed to the RF flanges and to SiC inner part L ~ 0.3 m V. SOLDATOV

9. germana.riddone@cern.ch 02-Dec-2010 9 XB-10 BI-DIRECTIONAL COUPLERS The material of DC is Oxygen Free High Conductivity Copper. Technical requirements: coupling factor: -45…50 dB directivity: < -30 dB We have tree different designs of DCs made by four companies. 1.DC with RF windows, Gycom (RU) RF measurements at 11.9942 GHz S ₁₁ = -28.2 dB S ₁₃ = -36.1 dB S ₁₄ = -64.8 dB CERN required to develop more compact and simple design of DC. for general waveguide: Peak Power=200 MW, Average=3 KW for diagnostic waveguide: Peak Power=2 KW, Average Power=30 mW Port 1 Port 4 Port 2 Port 3

10. germana.riddone@cern.ch 02-Dec-2010 10 XB-10 BI-DIRECTIONAL COUPLERS 3. DC with RF pick-ups, COBHAM (UK) RF measurements: S11 port12 11.424 GHz -50 dB, 11.994 GHz -42.5 dB S22 port12 11.424 GHz -41.9 dB, 11.994 GHz -47.8 dB S12 port13 11.424 GHz -98.9 dB, 11.994 GHz -66.1 dB S12 port14 11.424 GHz -50.2 dB, 11.994 GHz -51.0 dB S12 port23 11.424 GHz -50.3 dB, 11.994 GHz -51.0 dB S12 port24 11.424 GHz -64.2 dB, 11.994 GHz -60.9 dB 4. DC with RF pick-ups, IHEP (CN) The prototype of DC from IHEP is ready and will be delivered at CERN in few days. 2. DC with RF pick-ups, Nihon Koshuha (JP) RF measurements: S11 port12 11.424 GHz -40.1 dB, 11.994 GHz -45.0 dB S22 port12 11.424 GHz -36.6 dB, 11.994 GHz -45.0 dB S12 port13 11.424 GHz -49.0 dB, 11.994 GHz -48.9 dB S12 port14 11.424 GHz -67.4 dB, 11.994 GHz -73.7 dB S12 port23 11.424 GHz -70.3 dB, 11.994 GHz -75.5 dB S12 port24 11.424 GHz -49.0 dB, 11.994 GHz -48.7 dB Compact design of DCs with RF pick-ups were made by three companies:

11. germana.riddone@cern.ch 02-Dec-2010 11 XB-10 PHASE SHIFTER The material is Oxygen Free High Conductivity Copper. RF measurements Technical requirements: X-band variable power attenuators are intended to operate with microwave radiation at frequency of 11.9942 GHz Phase Shifter has a total tuning range of 32 degrees of RF phase Setting the zero point to the 30 degrees of “polarizer” angle and keeping the matching of the RF phase shifter better than -25 dB RF phase tuning rang goes from -16 to +8 degrees

12. germana.riddone@cern.ch 02-Dec-2010 12 XB-10 Technical requirements: X-band variable power attenuators are intended to operate with microwave radiation at frequency of 11.9942 GHz, 75 MV, pulse length of 30 ns and repetition frequency of 50 Hz. RF measurements VARIABLE POWER ATTENUATOR The material is Oxygen Free High Conductivity Copper.

13. germana.riddone@cern.ch 02-Dec-2010 13 XB-10 SPLITTERS RF measurements at 11.994 GHz S11 1-2: -58.0 dB 1-3: -60.3 dB S12 1-2: -3.06 dB 1-3: -3.02 dB Port 2 Port 1 Port 3 The material is Oxygen Free High Conductivity Copper.

14. germana.riddone@cern.ch 02-Dec-2010 14 XB-10 HYBRIDS The material is Oxygen Free High Conductivity Copper. Port 2 Port 1 Port 4 Port 3 RF measurements at 11.994 GHz

15. germana.riddone@cern.ch 02-Dec-2010 15 XB-10 MTF Manufacturing and Test Folder (MTF) is used in CERN for the product life cycle management. Together with Engineering data management system (EDMS), it is possible to follow the whole lifecycle of product from design to dismantling. MTF includes following information: – Structure of assembly – Made of – Equipment data – Manufacturing Workflow steps – Quality control – Documents(links to EDMS) With MTF it is easy to follow the progress of manufacturing and to find all the documents concerning specific RF component.

16. germana.riddone@cern.ch 02-Dec-2010 16 XB-10 MTF WORKFLOW The manufacturing workflow describes the manufacturing process. It is an easy way to check the status of RF components. By clicking on the step a new window opens with more specific information about the step and related tests.

17. germana.riddone@cern.ch 02-Dec-2010 17 XB-10 DATABASE OF RF COMPONENTS Due to the growing number of RF components, their management and logistics become a challenging task. The database of RF components was developed and implemented focusing on inventory and logistics data management by Ioannis Kossyvakis, University of Patras (Greece). Friendly user interface, easy modification but also expandability of such a database are some of the criteria of its development. Choice of software according to the mentioned factors : Microsoft Access 2007 ®

18. germana.riddone@cern.ch 02-Dec-2010 18 XB-10 DATABASE OF RF COMPONENTS

19. germana.riddone@cern.ch 02-Dec-2010 19 XB-10 Several X-band RF components are needed for CERN and other institutes such as PSI (CH) and Sincrotrone Trieste (IT). The development of RF components was done in collaboration with several industrial partners. Some of them have been tested at high power (loads) and results are good. The overall validation will continue in the next months. Due to the increase of needs, CERN developed tools to follow the RF components from the design to the testing, including a RF database for logistics and inventory purposes. CONCLUSIONS