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Toohig candidate’s presentation

Toohig candidate’s presentation. Sergey Arsenyev PhD candidate at Massachusetts Institute of Technology Department of Nuclear Science and Engineering. Joint LARP CM26 / Hi- Lumi Meeting at SLAC, May 18, 2016. Outline. My background Overview of my research LARP areas I want to explore.

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Toohig candidate’s presentation

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  1. Toohig candidate’s presentation Sergey Arsenyev PhD candidate at Massachusetts Institute of Technology Department of Nuclear Science and Engineering Joint LARP CM26 / Hi-Lumi Meeting at SLAC, May 18, 2016

  2. Outline • My background • Overview of my research • LARP areas I want to explore

  3. Outline • My background • Overview of my research • LARP areas I want to explore

  4. Undergraduate school Nizhny Novgorod, Russia Plasma physics High power electronics Ocean acoustics Institute of Applied Physics Laser physics

  5. Graduate school Russia Boston MIT, Plasma Science and Fusion Center

  6. Graduate school Lansing Boston Group AOT-HPE Los Alamos

  7. Outline • My background • Overview of my research • LARP areas I want to explore

  8. Undergraduate research: Photospheres of white dwarfs and neutron stars Free electrons Emissivity Bound electrons Frequency Made a correction to emissivity spectra of certain stars Papers: S.A. Koryagin, S.A. Arsenyev, JETP, Vol. 141, No 6 (2012) S.A. Koryagin, S.A. Arsenyev, Radiophysics and Quantum Electronics, Volume 53, Issue 11, pp 650-665 (2011)

  9. Graduate research: PBG cavities • Beam break-up (BBU) limits max current. • BBU is caused by parasitic higher order modes (HOMs). • PBG accelerating module provides HOM suppression. • The structure comes with a bonus of increased real estate gradient. • The structure is proposed as a harmonic cavity for eRHIC at BNL. 2.1 GHz 5-cell SRF accelerating cavity with a PBG cell

  10. Graduate research: PBG cavities 1D Bragg reflector Photonic Band Gap lattice Dispersion diagram of a PBG structure

  11. Graduate research: PBG cavities Photonic Crystal Fibers used in optics Opal is a natural photonic crystal RF cavity formed by 2 layers of photonic crystal

  12. Graduate research: PBG cavities Simulated shunt impedances and loaded Q factors for monopole and dipole HOMs Loaded Qs are in the range , with most dangerous HOMs damped to Q on the order of .

  13. Graduate research: PBG cavities Unloaded Q vs accelerating gradient at 4K Obtained vs their expected values

  14. Example of a research problem Design and theory Problem Solution RF cells are analogous to coupled pendulums Needed magnetic field profile Circuit model for a system of 5 RF cells Needed electric field profile detunings voltages

  15. Example of a research problem Simulation and optimization Problem Solution MATLAB script Q-factors of many HOMs need to be minimized EM solver (HFSS) .vbs file .bat file Parameters in a complex geometry

  16. Example of a research problem Cryogenic testing Problem Solution “Trapped” waveguide mode Accelerating mode Modified cover plate Measured Q-factor is 2 orders of magnitude lower than expected

  17. Outline • My background • Overview of my research • LARP areas I want to explore

  18. LARP areas I want to explore Feedback system Magnets E-lens Crab cavities

  19. LARP areas I want to explore Magnets Gradient vs aperture of a quadrupole magnet LARP magnet R&D flow chart Sources: 1) S. A. Gourlay et al., IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. 16, NO. 2, JUNE 2006. 2) Gian Luca Sabbi, CERN Yellow Report CERN-2011-003, pp. 30-36. 3) M. Marchevsky, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. 22, NO. 3, JUNE 2012

  20. LARP areas I want to explore Crab cavities Reduction of is only beneficial if crabbing is used Source: G. Arduini et al., How to Maximize the HL-LHC Performance, Proceedings of the Review of LHC and Injector Upgrade Plans Workshop, Archamps, 2013.

  21. LARP areas I want to explore Crab cavities • Goals: • Design cryomodules equipped with tuners, FPC, HOM dampers • Install and test cryomodules at SPS in 2016 -2017 • Design crabbing in the other direction DQW Crab • Particularly interesting topics: • HOM damping • Cryomodule design • Cryogenic testing RFD Crab Sources: 1) Q. Wu, IPAC 2015. 2) Silvia Verdú-Andrés et al, IPAC 2015, paper MOBD2. 3) B. Xiao et al., IPAC 2015, paper WEPWI059. 4) S. De Silva et al., Crab Cavity HOM Coupler Design & Fabrication Review, December 2014

  22. Conclusions • My background spans design, simulations and experimental work, with focus on RF structures. • Interesting areas of LARP research: crab cavities, magnets. • I hope to learn more about all areas of LARP research during this meeting. Thank you!

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