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Graduate Exam Abstract


Nihan Sipahi

Ph.D. Final

November 28, 2017, 10:00 am - 1:00 pm

C101B ECE Conference Room

DESIGN OF AN INTEGRATED COMPACT HIGH POWER SUPERCONDUCTING RADIO FREQUENCY ELECTRON BEAM SOURCE AND KLYSTRON-INSPIRED COMPACT AND TUNABLE THZ POWER SOURCE


Abstract: There exists a need for compact, reliable, high-power electron sources for applications including those in waste treatment, basic science, defense, and security. There also exists a need for compact electron-beam based light and power sources of various power levels and at different frequencies (mm-wave to gamma rays) for applications also in the fields of basic science, industry, and defense and security. Today’s examples of high-average-power electron sources are neither very compact nor highly efficient. The same may be said for many of the electron-beam based light sources operated worldwide for myriad of applications. Recent breakthroughs in superconducting (SC) materials technology, radio-frequency (RF) power systems, specialized cathodes, and RF cavity designs offer ways to overcome the above-mentioned shortcomings. In this dissertation, all these new features are integrated in a comprehensive design into one promising concept for a compact superconducting RF (SRF) high-average power electron linear accelerator. This design is capable of 5- 50 kW average electron beam power and continuous wave operation with the corresponding electron beam energy up to 10 MeV. In addition, the community also has a need for compact light sources for many different wavelength regimes as well as a variety of peak and average powers. Specifically, we are also exploring a novel continuous wave terahertz source designed from basic principles.

Adviser: Tony Maciejewski
Co-Adviser: N/A
Non-ECE Member: Norm Buchanan, Physics
Member 3: George Collins
Addional Members: Edwin Chong

Publications:
• Sipahi, N.,Biedron, S.,Einstein, Dattoli, G., Freund,H.P., van der Slot, P.J.M., Milton, S., " A Compact, High-Power, Fully Coherent FEL System Architecture", 21st International Conference on High-Power Particle Beams Proceedings, Portugal, September 18-22, 2016
• Sipahi, N., Biedron S., Gonin, I., Kephart, R., Khabiboulline, T., Milton, S., Solyak, N., Yakovlev, V., "RF Design of a 1.3-GHz High Average Beam Power SRF Electron Source." 26th North American Particle Accelerator Conference (NA-PAC'16) Proceedings, Chicago, Illinois, USA October 9-14, 2016. JACOW, Geneva,Switzerland, 2016.
• Sipahi, Nihan, et al. "RF Design of a High Average Beam-Power SRF Electron Source." 7th International Particle Accelerator Conference (IPAC'16), Busan, Korea, May 8-13, 2016. JACOW, Geneva, Switzerland, 2016.
• Kephart, Robert, et al. "SRF, Compact Accelerators for Industry & Society."17th International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015. JACOW, Geneva, Switzerland, 2015.
• Milton, S., Biedron S., Harris, J., Martinez, J., D’Audney, A., Edelen J., Einstein, J., C. Hall, Horovitz, K., Morin, A., Sipahi, N., Sipahi, T., Williams, J., Carrico, C., and van der Slot, P.J.M. “Colorado State University (CSU) Accelerator and FEL Facility.”, In 5th International Particle Accelerator Conference (IPAC’14) Proceedings, Dresden, Germany, June 15-20, 2014, pp. 3937-3939. JACOW, Geneva, Switzerland, 2014.
• Sipahi, T., Sipahi, N., Biedron, S., and Milton, S. “X-band RF Power Generation via an L-band Accelerator System and Uses” Directed Energy Professional Society (DEPS) 16th Annual Directed Energy Symposium Proceedings, Huntsville, Alabama, March 10-14, 2014.
• Sipahi, N., Sipahi, T., Biedron, S., and Milton, S. “X-band RF power Generation via L-band Accelerator System and Uses.”, In 25th North American Particle Accelerator Conference (NA-PAC’13) Proceedings, Pasadena, California, USA, Sept. 29-Oct. 4, 2013, pp. 951-953. JACOW, Geneva, Switzerland, 2014.
• Sipahi, T., Sipahi, N., Biedron, S., and Milton, S. “Passively Driving X-Band Structures to Achieve Higher Beam Energies.”, In 25th North American Particle Accelerator Conference (NA-PAC’13) Proceedings, Pasadena, California, USA, Sept. 29 – Oct. 4, 2013, pp. 1001-1003. JACOW, Geneva, Switzerland, 2014.
• Milton, S., Biedron S., Harris, J., Martinez, J., D’Audney, A., Edelen J., Hall C., Horovitz K., Morin A., Rand L., Sipahi N., Sipahi, T., Williams, J., Medicine Bear, S., Carrico, C., Moin, N., Van Keuren, J., van der Slot, P.J.M., Bos, A., Dong, A., Kang, L., Kenny, K., Smith. J. “Status of the CSU Accelerator and FEL Facility”, Directed Energy Professional Society (DEPS) Fourth Annual Advanced High-Power Lasers Meeting Proceedings, Santa Fe, New Mexico, USA, June 24-27, 2013.
• Sipahi, N.*, Sipahi, T.*, Biedron, S., Milton, S. and Adolphsen C. “Passively Driving X-band Structure to Achieving Higher Beam Energies”, In 6th International Particle Accelerator Conference (IPAC’13) Proceedings, Shanghai, China, May 12-17, 2013, pp. 1304-1306. JACOW, Geneva, Switzerland, 2013.
• Milton, S., Biedron, S., Burleson, T., Carrico C., Edelen, J., Hall, C., Horovitz, K., Morin, A., Rand, L., Sipahi, N., Sipahi, T., van der Slot, P.J.M., Dong, A., Yehudah, H., “The CSU Accelerator and FEL Facility”, 34th International Free Electron Laser Conference (FEL 2012), Nara, Japan, Aug. 26-31, 2012, pp. 373-376. JACOW, Geneva, Switzerland, 2012.


Program of Study:
ECE580B3
ECE581A3
ECE680A3
ECE680A4
ENGR697-738
PHYSICS745
ECE799
GSTR600