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	Alex H. Lumpkin
Affiliation:	Fermilab
Job Title:	Guest Scientist
Phone:	(630) 840-8393
Division/Group:	Accelerator/Instrumentation

Areas of Research Interest

My research interests include time-resolved imaging of particle or photon beams using a variety of interaction mechanisms such as optical/x-ray synchrotron radiation (OSR/XSR), optical transition radiation (OTR), optical diffraction radiation (ODR), undulator radiation, and the free-electron laser (FEL) radiation process. In some cases both incoherent and coherent aspects of the radiation have been utilized in one way or another to measure a beam parameter. I am currently involved in experiments on the Fermilab A0 photoinjector using a synchroscan streak camera to measure drive laser bunch lengths directly and e-beam bunch lengths via OTR, on the JLAB CEBAF transport line A using ODR as a nonintercepting beam-size monitor, and on the APS linac looking at enhanced/coherent OTR processes following bunch compression. Some of these techniques have displayed the dynamics of beam instabilities elucidating the physics and/or have relevance to proposed accelerator projects such as the ILC, high-energy ERLs, and XFELs.

Selected List of Publications

• A.H .Lumpkin et al., “Time-resolved Electron-beam Diagnostics for the Los Alamos Free-Electron Laser Oscillator Experiment,” IEEE Trans. on Nucl. Sci., 30(4) 3139 (1983).
• A.H. Lumpkin et al., “Optical Transition Radiation Measurements for the Los Alamos and Boeing Free-Electron Laser Experiments”, Nucl. Instrum. Methods in Phys. Res., A285, 134-143 (1990).
• A.H. Lumpkin et al., “First Measurements of Electron-beam Transit Times and Micropulse Elongation in a Photoelectric Injector at the High Brightness Accelerator FEL (HIBAF),” Nucl. Instrum. Methods A318, 415-421 (1992).
• A.H. Lumpkin and J.W.Early, “First Dual-Sweep Streak Camera Measurements of a Photoelectric Injector Drive Laser”, Nucl. Instrum. Methods A318, 389-395 (1992).
• Alex H. Lumpkin and Bingxin Yang, “Use of Few-Angstrom Radiation Imaging to Characterize Ultra-Bright, Multi-GeV Particle Beams,” Phys. Rev. Letters, Vol. 82, No. 18, May 3, 1999, pp. 3605-3608.
• A.H. Lumpkin, “Beam Instabilities Diagnostics,” presented at the ESRF Beam Instabilities Workshop, Grenoble, France, March 2000. A.H. Lumpkin et al., “First Observation of z-dependent Microbunching using Coherent Transition Radiation,” Phys. Rev. Lett., 86(1), 79, January 1, 2001.
• A.H. Lumpkin et al., “First Observations of Microbunching “Sidebands” in a Saturated FEL Using Coherent Optical Transition Radiation,” Phys. Rev. Lett., 88(23), 23480101-1, June 10, 2002.
• A.H. Lumpkin et al., “Near-field Imaging of Optical Diffraction Radiation generated by a 7-GeV Electron Beam,” Phys. Rev. Spec.Topics-AB 10, 022802 (2007) .