Rongli's Home Page

Rong-Li Geng

email: rg58@cornell.edu
SRF Group
LEPP
Cornell University

Education

Doctor of Philosophy Degree, Deptartment of Technical Physics,Peking University, 1996.
Major: Particle Accelerator Physics
Thesis research topic: production of high-brightness electron beams using laser-driven photo-cathodes and superconducting RF cavities

Bachelor of Science Degree, Department of Technical Physics, Peking University, 1991.
Major: Nuclear Physics

Teaching and Research Experience

2003 - present, Cornell ERL injector superconducting Nb cavity prototype.
2002 - present, High-gradient superconducting RF cavity R&D for ILC.
2001 - 2004, 200 MHz superconducting Nb-Cu cavity R&D for the Neutrino Factory and Muon Collider Collaboration.
1999 - 2004, Multipacting breakdown in a rectangular waveguide coupler for accelerators.
1997 - 2001, The phase III upgrade of the Cornell Electron Storage Ring (CESR), particularly its superconducting RF system.
1996 - 1997, Feasibility study of the RF system of the Beijing Tau-Charm Factory at IHEP, Beijing, China.
1994 - 1996, Design, construction and commissioning of the laser-driven high-brightness electron source at Peking University.
1993 - 1995, Manufacture and measurement of 1.5GHz superconducting cavities made out of Chinese Niobium plates.
1992 - 1994, Studies on novel photocathodes compatiable with superconducting cavities using the ion beam implantation technique.
1994 - 1995, Graduate Teaching Assistant on Mathematical Methods in Physics in Department of Technical Physics, Peking University.
1991 - 1992, Graduate Teaching Assistant on Mathematical Methods in Physics in Department of Technical Physics, Peking University.

Research Interests

High-brightness ultra-short electron beams, production and application.
RF superconductivity and its applications in accelerators.
Computational modeling of problems in accelerator physics.

Awards and Affiliations

2000, Peking University, Award for Execllence in Doctoral Dissertation.
1996, State Commission of Science and Technology of China, National Award for Science and Technology Advancement.
1996, Chou-Pei-Yuan Foundation, Award for Research Achievements with Applications of HP Instruments.
1995, Chinese Physical Society PAS, Award to a Young Scientist for Distinguished Research Papers.

Publications

Book

Co-translator of the Chinese version of Charged Particle Beams, ISBN 7-5022-1497-6/TL501, Atomic Energy Press, China, 1999.

John Wiley and Sons

Journal papers

R.L. Geng, Review of new shapes for higher gradient, Physica C, 441, (2006) p145-150.
R.L. Geng, P. Goudket, R.G. Carter, S. Belomestnykh, H. Padamsee, D.M. Dykes, Dynamical aspects of multipacting induced discharge in a rectangular waveguide, Nuclear Instruments & Methods in Physics Research, A538, (2004) p189-205.
R.L. Geng, H. Padamsee, S. Belomestnykh, P. Goudket, D.M. Dykes, R.G. Carter, Suppression of multipacting in rectangular coupler waveguides, Nuclear Instruments & Methods in Physics Research, A508, (2003) p227-238.
V. Shemelin, H. Padamsee, R.L. Geng, Optimal cells for TESLA accelerating structure, Nuclear Instruments & Methods in Physics Research, A496, (2003) p1.
With Zhao Kui et.al., The High-brightness Ultra-short Pulsed Electron Beam Source at Peking University. Nuclear Instruments & Methods in Physics Research, A407, (1998) p322.
Geng Rongli, Song Jinhu, Yu Jin, Studies on a Laser Driven Photoemissive High-Brightness Electron Source and Novel Photocathodes, High Energy Physics and Nuclear Physics, Vol.21, No. 1, (1997) p67.
K. Zhao, R.L. Geng, L.F. Wang, B.C. Zhang, J. Yu, T. Wang, G.F. Wu, J.H. Song, J.E. Chen, Design and Construction of a DC High-Brightness Laser Driven Electron Gun, Nuclear Instruments & Methods in Physics Research, A375 (1996) p147.
Zhang Gengmin, Geng Rongli, Shi Ziguang, Yan Jiwen, Wu Quangde, Electron Emission from Oxide-Coated Cathodes under Laser Illumination, Vacuum Science and Technology, Vol.16, No. 4, (1996) p242.

Presentations/Reports

R. L. Geng, C. Crawford, H. Padamsee, A. Seaman, Vertical electropolishing niobium cavities, Presented at the 12th International Workshop on RF Superconductivity, Ithaca, NY, USA, July 10 - 15, 2005.
R. L. Geng, Review of new shapes for higher gradients, Invited talk at the 12th International Workshop on RF Superconductivity, Ithaca, NY, USA, July 10 - 15, 2005.
R. L. Geng, H. Padamsee, A. Seaman, V.D. Shemelin, World record accelerating gradient achieved in a superconducting niobium cavity, Contributed talk at the 2005 Particle Accelerator Conference, Knoxville, TN, May 16 - 20, 2005.
R. L. Geng, P. Barnes, M. Liepe, V. Medjidzade, H. Padamsee, A. Seaman, J. Sears, N. Sherwood, V.D. Shemelin, Progress of 2-cell cavity fabrication for Cornell ERL injector, Presented at the 2005 Particle Accelerator Conference, Knoxville, TN, May 16 - 20, 2005.
R. L. Geng, H. Padamsee, Reentrant cavity and first test result, Contributed talk at the Pushing the Limits of RF Superconductivity Workshop, Argonne National Laboratory, September 22 - 24, 2004.
R. L. Geng et al., 200MHz superconducting RF cavity development for RLAs, AIP conference proceedings, Vol. 721, Adam Para (ed.), ISBN 0-7354-0201-9, Melville, New York, 2004, p.445.
R. L. Geng, P. Barns, D. Hartill, H. Padamsee, J. Sears, S. Calatron,, E. Chiaveri, R. Losito, H. Preis, 200MHz Nb-Cu cavities for muon acceleration, Invited talk at the 11th Workshop on RF Superconductivity, Travemunder/Lubeck, Germany, September 8 - 12, 2003.
R. L. Geng, A. Crawford, G. Eremeev, H. Padamsee, Continuous current oscillation electropolishing and applications to half-cells, Presented at the 11th Workshop on RF Superconductivity, Travemunder/Lubeck, Germany, September 8 - 12, 2003.
R. L. Geng, S. Belomestnykh, H. Padamsee, P. Goudket, D. M. Dykes, R. G. Carter, Dynamics of multipacting in rectangular coupler waveguide and suppression methods, Presented at the 11th Workshop on RF Superconductivity, Travemunder/Lubeck, Germany, September 8 - 12, 2003.
R. L. Geng, L-band SRF cavities with electropolished and heat treated half-cells, Talk presented at the Amercian Linear Collider Workshop, Cornell University, July 13 - 16, 2003.
R. L. Geng, H. Padamsee, D. Hartill, P. Barnes, J. Sears, R. Losito, E. Chiaveri, H. Preis, S. Calatroni, 200MHz superconducting RF cavity development for RLAs, Invited talk at the 5th International Workshop on Neutrino Factories and Superbeams, Columbia University, New York, June 5 - 11, 2003.
R. L. Geng, Multipacting simulations for superconducting cavities and RF coupler waveguides, Invited talk at the 2003 Particle Accelerator Conference, Portland, OR, (2003).
R. L. Geng, P. Barnes, D. Hartill, H. Padamsee, J. Sears, S. Calatroni, E. Chiaveri, R. Losito, H. Preis, First RF test at 4.2 K of a 200 MHz superconducting Nb-Cu cavity, Presented at the 2003 Particle Accelerator Conference, Portland, OR, (2003).
R. L. Geng, A. Crawford, G. Eremeev, H. Padamsee, J. Sears, A 1500 MHz niobium cavity made of electropolished half-cells, Presented at the 2003 Particle Accelerator Conference, Portland, OR, (2003).
R. L. Geng, S. Belomestnykh, H. Padamsee, J. Reilly, P. Goudket, D.M. Dykes, R.G. Carter, Experimental Studies of Electron Multipacting in CESR Type Rectangular Waveguide Couplers, Proceedings of the Eighth European Particle Accelerator Conference, Paris, France, (2002)p2238.
R. L. Geng, H. Padamsee, On the Low-Field Q-Slope of RF Superconducting Niobium Cavities Cooled by Helium-I, Cornell University LNS report, SRF011212-10, (2001).
R. L. Geng, H. Padamsee, V. Shemelin, Multipacting in a Rectangular Waveguide, Proceedings of the 2001 Particle Accelerator Conference, Chicago, (2001)p1228.
R. L. Geng, Thermal Analysis of A 200 MHz Nb-Cu Cavity, Cornell University LNS report, SRF010212-01, (2001).
R. L. Geng, J. Knobloch, H. Padamsee, Micro-Structures of RF Surfaces in the Eletron-Beam Weld Regions of Niobium, Proceedings of the 9th Workshop on RF Superconductivity, Santa Fe, New Mexico, (1999)p238.
R. L. Geng and H. Padamsee, Condensation/Adsorption and Evacuation of Residual Gases in the SRF System for the CESR Luminosity Upgrade, Proceedings of the 1999 Particle Accelerator Conference, New York City, New York, (1999)p983.
R. L. Geng and H. S. Padamsee, Exploring Multipacting Characteristics of a Rectangular Waveguide, Proceedings of the 1999 Particle Accelerator Conference, New York City, (1999)p429.
Geng Rongli, Song Jinhu, Yu Jin, The Physical Design of the Laser-Driven High-Brightness Electron Source and the Studies of Novel Photocathodes (invited talk), Proceedings of the 6th Conference of the Chinese Particle Accelerator Society, Chengdu, (1996)p124.
C.E. Chen, R.L. Geng, J.H. Song, L.F. Wang, J. Yu, B.C. Zhang, K. Zhao, A Hybride Laser-Driven e-Beam Injector Using Photocathode Electron Gun and Superconducting Cavity, Proceedings of the 1996 European Particle Accelerator Conference, Barcelona, spain, p1547.
Zhao Kui, Geng Rongli, Yu Jin, Zhang Baocheng, Chen Chia-erh, Feasibility Study of Ion Implanted Photocathode for High-Brightness Injector, Proceedings of the 1994 International LINAC Conference, Tsukuba, Japan, p413.

Internal Notes

PAC07 poster on high gradient, High gradient studies for ILC with single-cell cavity , June 16, 2007.
PAC07 poster on ERL injector cavity, ERL injector cavity , June 16, 2007.
R. L. Geng, Dark current in SRF cavities and linac structures: Kick-off topics , April 13, 2005.
R. L. Geng, Exploring geometries of SRF cavities for a future muon collider , June 10, 2004.
R. L. Geng, Protocol for Performing Gas Helium Processing of SRF Cavities in SRF Group at Cornell , December 1, 2003.
R. L. Geng, Specification for Annealing Copper Blanks in LEPP Vaccum Furnace for Stamping Cavity Cups , August 12, 2003.

Some useful links

Rongli Geng
SRF Group
Laboratory for Elementary Particle Physics
Cornell University
Ithaca, NY14853-5001
Phone: (607) 255-4951, Fax: (607) 254-4552

grl@mail.lns.cornell.edu

Last modified on June 16, 2007