Title :
Observations of underdense plasma lens focusing of relativistic electron beams
Author :
Thompson, M.C. ; Badakov, H. ; Rosenzweig, J.B. ; Travish, G. ; Fliller, R. ; Kazakevich, G.M. ; Piot, P. ; Santucci, J. ; Li, J. ; Tikhoplav, R.
Author_Institution :
UCLA, Los Angeles
Abstract :
Focusing of a 15 MeV, 19 nC electron bunch by an underdense plasma lens operated just beyond the threshold of the underdense condition has been demonstrated in experiments at the Fermilab NICADD Photoinjector Laboratory (FNPL). The strong 1.9 cm focal-length plasma-lens focused both transverse directions simultaneously and reduced the minimum area of the beam spot by a factor of 23. Analysis of the beam-envelope evolution observed near the beam waist shows that the spherical aberrations of this underdense lens are lower than those of an overdense plasma lens, as predicted by theory. Correlations between the beam charge and the properties of the beam focus corroborate this conclusion.
Keywords :
aberrations; electron beam focusing; particle beam bunching; plasma focus; relativistic electron beams; relativistic plasmas; FNPL; Fermilab NICADD Photoinjector Laboratory; beam-envelope evolution; electron bunch; electron volt energy 15 MeV; relativistic electron beams; spherical aberrations; underdense plasma lens focusing; Electron beams; Ion beams; Lenses; Particle beams; Plasma density; Plasma devices; Plasma displays; Plasma properties; Plasma transport processes; Space charge;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4441128
