1. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 1 Asymmetric ERL for Ultra-high Fluxes of X-ray and THz Radiation I.V. Konoplev 1, A. Seryi 1, A. Lancaster 1, K. Metodiev 1, G. Burt 2 and R. Ainsworth 3 1 John Adams Institute, Department of Physics, University of Oxford, Oxford, UK 2 Cockcroft Institute, Lancaster University, Lancaster, UK 3 Fermilab, Batavia, Illinois, USA

2. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 2 Introduction UH-FLUX: Asymmetric Energy Recovery LINAC Basic concept Cavity prototypes: design and construction First Experimental Studies Conclusion Asymmetric ERL for Ultra-high Fluxes of X-ray and THz Radiation

3. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 3 Motivation Application of Ultra-High Intensity source of coherent radiation THz Application : Aim to produce high power (up to 1MW) radiation in frequency range from 0.1 THz to 10 THz No industrial company can currently produce high power THz in this range, therefore a unique product. X-ray Application: Aim to generate 10 18 -10 20 photon per second of X-ray radiation at 7-13 nm wavelength In addition, the system should be energy efficient, compact and has the flexibility of going to an even lower nm range. Markets: Cargo Screening: The World Market for Explosives, Weapons, and Contraband Detection Equipment (EWC) is estimated to be some $2.1 billion annually 1 Replacing X-ray scanners: The global security screening market is expected to reach $9.10 Billion by 2020 2 Non-contact imaging of coatings, composites, drug formulation, non-destructive sources and material/medical diagnostics research market Lithography for the £332 billion Semiconductor Industry: $7 billion market in 2014 3 1 The Market for Explosives, Weapons and Contraband (EWC) Detection Equipment – HIS Technology, 2014 Edition 2 Security Screening Market - Analysis and Forecast 2013-2020 – Markets and Markets, 2014 Edition 3 Investor Day, ASML Small Talk London - 2015

4. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 4 UH-FLUX: AERL Collaboration of UK centers JAI, CI, STFC and UK industry is developing an advanced Compton/THz source –This design will surpass any existing designs [1] International (PCT) Patent Application No. PCT/GB2012/052632 (WO2013/061051) filed on the 26th October 2012 [2] Oxford University Isis Project No. 11330 – “Asymmetric superconducting RF structure” (UK Priority patent application 1420936.5 titled ‘Asymmetric superconducting RF structure’ filed on the 25th November 2014 Accelerating section Decelerating section Cryo-module Magneto-optical system Interaction point X-ray/THz

5. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 5 UH-FLUX: AERL

6. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 6 UH-FLUX: AERL

7. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 7 UH-FLUX: AERL Acc. mode One of parasitic modes Decoupling all modes except the accelerating mode to maximize the beam current

8. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 8 UH-FLUX: AERL UH-FLUX: AERL Operating field flatness @1.3GHz Electric field contour plot of dipole eigenmode at 1.73GHz Electric field contour plot of resonant coupler eigenmode at 1.48GHz Electric field contour plot of operating eigenmode at 1.3GHz

9. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 9 Proof of the concept experimental studies –Aluminium 7 cells cavity –Copper 11 cells cavity –Preliminary results

10. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 10 - 7 cell cavity prototype is machined using computer controlled lathe from 2 blocks of solid aluminium. - The cavity is to develop techniques of such cavities studies - Conduct preliminary RF measurements - 11 cell full scale cavity copper prototype is under construction. - The cavity will be machined using similar process developed for SCRF cavities to demonstrate the technology and method. - The cavity will be used to conduct detailed RF studies of EM properties and compare with numerical predictions Both cavities will be used to develop full scale ready to use SCRF cavity for AERL Proof of the concept experimental studies

11. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 11 Scaled down prototype of the cavity 7 cells cavity: 3- accelerating; 3 decelerating and coupling cavity Accelerating section Decelerating section Bead pull RF measurements test bench VNA Bead pull pillars 7 cells asymmetric cavity made from 2 blocks of solid aluminium Resonant coupler

12. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 12 Preliminary experiments Port 4 Port 3 Port 2 Port 1 Aim: - to identify the cavity modes: operating and HOMs - To compare with numerical data generated by CST Microwave studio The antennas were inserted through the ports and S ii measurements were taken

13. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 13 Preliminary numerical results (CST MW studio) Operating mode Parasitic Mode type-1 Parasitic LOM Mode type-2

14. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 14 Starting measurements Kaloyan is inserting coupler inside the cavity to measure S 11 and S 21 parameters Measuring S 11 and S 21 parameters

15. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 15 Preliminary measurements of Q-factor Measurements of Q factor using Re(S 11 ) and Im (S 11 ) “Q-Factor Measurement with Network Analyzer”, D.Kajfez and E.J.Hwan, IEEE Trans. on Microwave Theory and Technique, MTT-32(7), pp.666-670, 1984 Calibration - “background” data Typical S11 from the cavity

16. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 16 Comparison of experimental data with numerical predictions ? ? CST microwave studio

17. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 17 Preliminary experimental studies: S 11 Position of possible HOMs measured using variation of relative phase of S 11 parameter at 4 ports. The HOMs are shifted in respect to each if excited at ports 1 and 2 other but more studies will be required to confirm the findings Port 4 Port 3 Port 2 Port 1

18. Seminar at University of Chicago, 10 Nov 2015, A. Seryi, JAI 18 Motivation for new ERL system capable of driving Ampere level average electron beam current has been discussed New design of the dual axis asymmetric cavity has demonstrated and basic concept has been discussed Results of numerical studies are shown The first prototypes of the cavity was manufactured and the RF measurements were studied in a second week of July. The first preliminary data was shown and technique used to identified the cavity eigenmodes has been shown. Thank you Conclusion