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

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Presentation on theme: "RF Technology Professor Richard Carter Lancaster University Engineering Department 23 rd November 2006."— Presentation transcript:

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

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

3 RF Presentation to CI SAC 23 Nov Research Group Strategy 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 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

4 RF Presentation to CI SAC 23 Nov 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

5 RF Presentation to CI SAC 23 Nov 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)

6 RF Presentation to CI SAC 23 Nov 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)

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

8 RF Presentation to CI SAC 23 Nov Stabilisation of c.w. magnetron oscillators 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 Free- running magnetron Magnetron with PLL frequency control Magnetron with PLL control and injection

9 RF Presentation to CI SAC 23 Nov High Power RF Sources for IFMIF Prof Richard Carter, Carl Beard Conceptual design report:1 MW c.w., 175 MHz, 90% efficiency DiacrodeIOTMagnetron Anode voltage 14 kV95 kV60 kV Anode current 103 A58 A20 A Efficiency71%65% (>75% with a multi-element depressed collector 90 % Gain13 dB23 dB> 30 dB Drive power50 kW5 kW< 1 kW CoolingAnodeCollectorAnode and (probably) cathode Electro- magnet NoYes (except the radial IOT)Yes AvailabilityYesWould require years R&DWould require 4 – 5 years R&D R&D issuesNone 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

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

11 RF Presentation to CI SAC 23 Nov 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.

12 RF Presentation to CI SAC 23 Nov 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

13 RF Presentation to CI SAC 23 Nov

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

15 RF Presentation to CI SAC 23 Nov 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

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

17 RF Presentation to CI SAC 23 Nov 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

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

19 RF Presentation to CI SAC 23 Nov Multipactor – prediction of secondary electron emission coefficients Dr Rebecca Seviour Accelrys used to investigate band diagrams of materials TiN = 1 TiN Al 2 O 3

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

21 RF Presentation to CI SAC 23 Nov RF Cavity development Dr Rebecca Seviour 2 x Post Docs (NF)

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

23 RF Presentation to CI SAC 23 Nov 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 Cavity development

24 RF Presentation to CI SAC 23 Nov RF Cavity development: Alternatives to EP Al 2 O 3 suspended in PH7 Solution. CMP cheaper & less hazardous than EP. Only useful on flat areas Chemical Mechanical Polishing (CMP) (Rohm and Haas Electronic Materials)

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

26 RF Presentation to CI SAC 23 Nov PBG Based Particle Acceleration Dr Rebecca Seviour 2 x Post Docs 2 x PhDs 1 x MSc

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

28 RF Presentation to CI SAC 23 Nov 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)


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