Faculty Directory

Koeth, Timothy W.

Koeth, Timothy W.

Director, UMD Radiation Facilities
Research Professor
Materials Science and Engineering
Institute for Research in Electronics & Applied Physics
Room 2303 Chemical and Nuclear Engineering Building


Ph.D., Rutgers University, 2009.



Richard J. Plano Dissertation Award, [Best Annual Rutgers Physics Ph.D.], April 2010



Washington Post Magazine, “Accelerated Learning,” Sept 11, 2016 

Nuclear News  “ ‘New’ Fuel for University of Maryland Research ReactorJune 2017

• Department of Energy's announcement of "UMD's New Used Fuel"

Terp Magazine, “Beam Team,” May 16, 2017

Physics Today, featured in BackScatter column, April, 2011

symmetrybreaking article on the “Physics of Scotch Tape,” January 2011

symmetry magazine article on the "DIY Cyclotron," August 2010, featured Small Cyclotron Conference

Make Magazine article, April 2005, reporting on personally built cyclotron

• Physics Today "Building a Cyclotron on a Shoestring" November 2004, feautured personally built cyclotron


Intense electron and ion beam accelerators and associated beam optics.  Novel energy storage devices.

Cyclotron Project:  For more than two decades Tim Koeth has been involved in an ongoing cyclotron project that has evolved into a one of a kind instructional accelerator program.  Initially started in his parents basement in the 1990s, moved to Rutgers University in 2000, and recently (2016) moved to UMD where it is the centerpiece of a Capstone Design class.  For more information about the cyclotron please go to the cyclotron website.


Betatron Project: Tim Koeth is revisiting an old concept with new techniques: the Plasma Betatron.  The concept of the betatron (or electron induction accelerator) was invented by Don Kerst in 1941.  Koeth is designing a varient that utilizes a pinched plasma to seed the electron beam.  This will generate an intense electron beam of tunable energy from which to generate high-energy broad-band photon (bremstraughlung) source  


UMER Non-linear Optics Project:  more to come


Gamma Ray Spectroscopy.  more to come




UMD HONR298J A Century of Smashing Atoms - an honors seminar where the genius of discovery is explored in the history of particle accelerators, 3cr, Spring 2019

UMD ENMA422, Radiation Effects of Materials, 3cr, Fall 2017

UMD EENE408T/PHYS499T/MSE489T Accelerator Physics - Capstone Design Project, 3cr, Spring 2016/2017/2018/…

UMD ENME432, Reactor and Radiation Measurements Laboratory, 3cr Spring 2015, Fall 2015, Spring 2016, Fall 2016, Spring 2017



Cyclotron Design, USPAS Winter 2017, UC Davis, 1.5cr (graduate level)

Cyclotron Design, Operation, and Measurement, USPAS Summer 2015, Rutgers University, 3cr (graduate level)

Cyclotron Design, USPAS Winter 2013, Duke University, 1.5cr (graduate level)

Fundamentals of Accelerator Physics, USPAS Summer 2011, Stony Brook, 2011


Planned USPAS courses :

Radiation & Matter in Accelerator Environments – Summer 2019

Cyclotrons and Their Design – Summer 2020

Waveguide Based Microwave Measurements – Summer 2021



For a complete list of publications, please visit my CV

“Quasi-Integrable Optics for a Small Electron Recirculator,” K. Ruisard, H. B. Komkov, B. Beaudoin, I. Haber, D. Matthew, T. W. Koeth, Submitted Physical Review Accelerators and Beams, November 2018

“Quadrupolar mode measurements for space charge dominated beams,” William D. Stem, Brian L. Beaudoin, Irving Haber, and Timothy W Koeth, Physics of Plasmas, Accepted April 23, 2018

Invited “Long-path-length experimental studies of longitudinal phenomena in intense beams,” B. Beaudoin, I. Haber, R. A. Kishek, S. Bernal, and T. W. Koeth, Physics of Plasmas, 23, 056701 2016.

“Demonstration of Neutron Detection Utilizing open Cell Foam and Noble Gas Scintillation,” C.M Lavelle, M. Coplan, E.C. Miller, A.K. Thompson, A.L. Kowler, R.E. Vest, A.T. Yue, T. W. Koeth, M. Al-Sheikhly, C.W. Clark, Applied Physics Letters, 106, 094103 (2015)

Invited: “Undergraduate Education with the Rutgers 12-Inch Cyclotron,” Timothy W. Koeth, CAARI2014, Physics Procedia, Volume 66, June 2015, Pages 622-631, http://www.sciencedirect.com/science/article/pii/S1875389215002369

Invited: “Modeling HIF relevant longitudinal dynamics in UMER,” B. Beaudoin, S. Bernal, C. Blanco, I. Haber, R.A. Kishek, T. W. Koeth, and Y. Mo, Nuclear Instruments and Methods A, 733, 178-181, 2014

Invited: “The University of Maryland Electron Ring program,”  R.A. Kishek, B. Beaudoin, S. Bernal, M. Cornacchia, D. Feldman, R. Fiorito, I. Haber, T. W. Koeth, Y. Mo, P.G. O'Shea, K. Poor Rezaei, D. Sutter, and H. Zhang, Nuclear Instruments and Methods A, 733, 233-237, 2014

“Longitudinal Confinement and Matching of an Intense Electron Beam,” B. Beaudoin, I. Haber, R.A. Kishek, S. Bernal, T. W. Koeth, D. Sutter, P.G. O.Shea, and M. Reiser," Physics of Plasmas 18, 013104 2011

“Smooth Approximation model of dispersion with strong space charge for continuous beams,” S. Bernal, B. Beaudoin, T. W. Koeth, P. G. O’Shea, Physical Review Special Topics - Accelerators & Beams, 14, 104202, 2011

“First observation of the exchange of transverse and longitudinal emittances,” J. Ruan, A. H. Lumpkin,  A. S. Johnson, R. Thurman-Keup, H. Edwards, R.P. Fliller, T. W. Koeth, and Y.-E Sun, Physics Review Letters, 106, 2011


Koeth Named Acting Director of Radiation Facilities

Research professor will manage training reactor, irradiator and linear accelerators.