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RF Technology Professor Richard Carter

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Presentation on theme: "RF Technology Professor Richard Carter"— Presentation transcript:

1 RF Technology Professor Richard Carter
Lancaster University Engineering Department 23rd November 2006

2 RF Presentation to CI SAC 23 Nov 2006
Research group focus Electromagnetics High power RF and microwave engineering Particle dynamics in RF electromagnetic fields Vacuum electronics RF Presentation to CI SAC 23 Nov 2006 Courtesy of Thales Electron Devices

3 Research Group Strategy
Strategic Aim: To maintain and build on our position as one of the leading university research groups in the world in the fields of Vacuum Electronics and High Power Microwave Engineering Key Strategic Actions: Focus on topics which present the greatest research challenges Gain strength by membership of national and international collaborations Ensure relevance by close links with industry Gain intellectual stimulation by links with related groups world-wide Focus publications on leading international journals and major international conferences RF Presentation to CI SAC 23 Nov 2006

4 RF Presentation to CI SAC 23 Nov 2006
Staff Academic staff Prof. Richard Carter Dr Amos Dexter Dr Rebecca Seviour Research staff Dr Graeme Burt Dr Richard Jenkins Jonny Smith Imran Tahir 2 Vacancies Research Students Chris Hill Sharon Crane Fay Hannon Emma Wooldridge Chris Lingwood RF Presentation to CI SAC 23 Nov 2006

5 RF Presentation to CI SAC 23 Nov 2006
Resources Microwave laboratory Test equipment High power sources Vacuum equipment Auger spectrometer Software Commercial (MAFIA, MWS, Lorenz HF, MAGIC, KOBRA3, Accelrys, GdfidL, FEMLab) Indigenous (Small and large-signal models for klystrons and travelling-wave tubes, models of helix and coupled-cavity slow-wave structures) RF Presentation to CI SAC 23 Nov 2006

6 Current research projects
Microwave tubes Stabilisation of c.w. magnetron oscillators High power magnetron for IFMIF Radial inductive output tubes Multiple beam klystron for CLIC Particle accelerators Energy recovery linac stability for 4GLS Crab cavity system for the ILC Collimator for the ILC High brightness gun for 4GLS RF vacuum breakdown (Multipactor) RF Presentation to CI SAC 23 Nov 2006

7 Future research projects
Superconducting RF systems Parallel operation of stabilised magnetrons Secondary electron emission theory Cavity technology for the Neutrino Factory RF Presentation to CI SAC 23 Nov 2006

8 Stabilisation of c.w. magnetron oscillators
Free-running magnetron Magnetron with PLL frequency control Magnetron with PLL control and injection Dr Amos Dexter, Imran Tahir PLL control of frequency Injection locking Phase locking to better than 1% Injected power – 37dB Magnetrons could be used as high efficiency, low cost sources for accelerators RF Presentation to CI SAC 23 Nov 2006

9 High Power RF Sources for IFMIF
Prof Richard Carter, Carl Beard Conceptual design report:1 MW c.w., 175 MHz, 90% efficiency Diacrode IOT Magnetron Anode voltage 14 kV 95 kV 60 kV Anode current 103 A 58 A 20 A Efficiency 71% 65% (>75% with a multi-element depressed collector 90 % Gain 13 dB 23 dB > 30 dB Drive power 50 kW 5 kW < 1 kW Cooling Anode Collector Anode and (probably) cathode Electro-magnet No Yes (except the radial IOT) Yes Availability Would require years R&D Would require 4 – 5 years R&D R&D issues None Mechanical stability of control grid Multi-element depressed collector design Multi-beam and radial beam designs Cathode choice for long life Development of switched mode power supply Demonstration of simultaneous control of amplitude and phase Stability RF Presentation to CI SAC 23 Nov 2006

10 Radial inductive output tubes
Collector Output cavity Input cavity RF Output Grid bias and RF Input Cathode Anode Sharon Crane (PhD student), Prof. Richard Carter Collaboration with E2V Technologies Target 1 GHz, 1 MW c.w. RF Presentation to CI SAC 23 Nov 2006

11 Multiple beam klystron for CLIC
Chris Lingwood (PhD student), Prof. Richard Carter Investigation of novel multiple beam klystron concepts for CLIC 1 GHz, 50 MW pk Collaboration with CERN and Thales Electron Devices Previous project – Future Linear Collider Klystron Study – Dr Jinjun Feng, Collaboration with CERN, DESY, E2V Technologies, TMD Technologies. RF Presentation to CI SAC 23 Nov 2006

12 Energy recovery linac stability for 4GLS
Emma Wooldridge (ASTeC Staff, PhD Student) Prof. Richard Carter Susan Smith (ASTeC) Study of beam break-up and its prevention RF Presentation to CI SAC 23 Nov 2006

13 RF Presentation to CI SAC 23 Nov 2006

14 High brightness gun for 4GLS
Fay Hannon (PhD student) Dr Rebecca Seviour Dr Bob Rimmer (JLab) Project funded and based at JLab RF Presentation to CI SAC 23 Nov 2006

15 RF vacuum breakdown (Multipactor)
Dr Rebecca Seviour, Dr Richard Jenkins, Dr Matt Stables, Chris Hill (PhD Student), Prof. Richard Carter Theoretical and experimental study of multipactor discharges in complex structures Collaboration with E2V Technologies Previous project – Multipactor in the CESR RF system, Dr Philippe Goudket, Professor Richard Carter, Mike Dykes (ASTeC) Collaboration with Cornell University RF Presentation to CI SAC 23 Nov 2006

16 Multipactor – Experimental Work
Chris Hill (PhD Student) Prof Richard Carter Multipactor in a klystron input cavity RF Presentation to CI SAC 23 Nov 2006

17 Multipactor – Simulation
Dr Rebecca Seviour Dr Matt Stables Aim – Computer simulation of multipactor in complex geometries Issues Accuracy of fields close to surfaces Knowledge of energy spectrum of secondary electrons RF Presentation to CI SAC 23 Nov 2006

18 Multipactor – Secondary Electron Emission Measurements
Dr Richard Jenkins Prof Richard Carter Re-commissioning of Auger spectrometer RF Presentation to CI SAC 23 Nov 2006

19 Multipactor – prediction of secondary electron emission coefficients
Dr Rebecca Seviour Accelrys used to investigate band diagrams of materials TiN  = 1 Al2O3 RF Presentation to CI SAC 23 Nov 2006

20 Muon Ionisation Cooling for NF & MICE
Dr Rebecca Seviour 1 x PhD (MICE Phase II) Need: 201 MHz Resonant Cavities at 16 MV/w in 4T field High accuracy measurement of the Eacc

21 RF Presentation to CI SAC 23 Nov 2006
RF Cavity development Dr Rebecca Seviour 2 x Post Doc’s (NF) RF Presentation to CI SAC 23 Nov 2006

22 RF Presentation to CI SAC 23 Nov 2006
RF Cavity development Without Magnetic field has achieved 16 MV/m Electric field  Magnetic field Surface currents Vacuum Metal Excitation Motion Impurities Scattering causes losses  limits current limits RF  limits acceleration RF Presentation to CI SAC 23 Nov 2006

23 RF Presentation to CI SAC 23 Nov 2006
RF Cavity development We propose to conduct a systematic review of each stage of manufacture. Investigating the effect each stage has on the surface topology and chemical composition of the surfaces, and ultimately the effect on cavity performance. Auger Spectrometry Atomic force microscopy These results will also be compared to theory. Transport Codes Cavity Q RF Presentation to CI SAC 23 Nov 2006

24 RF Presentation to CI SAC 23 Nov 2006
RF Cavity development: Alternatives to EP Chemical Mechanical Polishing (CMP) Al2O3 suspended in PH7 Solution. CMP cheaper & less hazardous than EP. Only useful on flat areas (Rohm and Haas Electronic Materials) RF Presentation to CI SAC 23 Nov 2006

25 RF Presentation to CI SAC 23 Nov 2006
RF Cavity development: Alternatives to EP Abrasive Flow (AF) Ra ~ 0.4 m RF Presentation to CI SAC 23 Nov 2006

26 RF Presentation to CI SAC 23 Nov 2006
PBG Based Particle Acceleration Dr Rebecca Seviour 2 x Post Doc’s 2 x PhD’s 1 x MSc RF Presentation to CI SAC 23 Nov 2006

27 RF Presentation to CI SAC 23 Nov 2006
PBG Based Particle Acceleration RF Creation Particle Acceleration Slow-wave structures Inverse Cherenkov Acceleration Quasi-Crystals/Metamaterials RF Presentation to CI SAC 23 Nov 2006

28 Selected Publications
Carter RG., ‘Accuracy of microwave cavity perturbation measurements’, IEEE Transactions on Microwave Theory & Techniques, vol.49, no.5, pp (2001) Geng RL. Padamsee H. Belomestnykh S. Goudket P. Dykes DM. Carter RG., ‘Suppression of multipacting in rectangular coupler waveguides’, Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors & Associated Equipment, vol.508, no.3, pp (2003) Tahir I., Dexter A.C and Carter R.G., ‘Noise Performance of Frequency and Phase Locked CW Magnetrons operated as current controlled oscillators’, IEEE Transactions on Electron Devices, vol.52, no.9, pp , (2005) Dexter A.C. and Seviour R. ‘Rapid Generation of Multipactor Charts by Numerical Solution of the Phase Equation’, J. Phys D: Appl. Phys. vol 38, pp , (2005) Seviour, R. ‘The Role of Elastic and Inelastic Electron Reflection in Multipactor Discharges’, IEEE Transactions on Electron Devices, vol.52, pp , (2005) Geng RL, Goudket P, Carter RG, Belomestnykh S, Padamsee H, Dykes DM, Dynamical aspects of multipacting induced discharge in a rectangular waveguide, Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors & Associated Equipment, vol.538, pp , (2005) Tahir I., Dexter A.C and Carter R.G., ‘Noise performance of frequency- and phase-locked CW magnetrons operated as current-controlled oscillators’, IEEE Transactions on Electron Devices Volume 3,  no.7,  pp.1721–1729, (2006) RF Presentation to CI SAC 23 Nov 2006


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