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Title: Results from the UCLA/FNPL underdense plasma lens experiment

Abstract

A gaussian underdense plasma lens with peak density 5 x 10{sup 12} cm{sup -3} and a full width half maximum (FWHM) length of 2.2 cm has been used to focus a relativistic electron beam. This plasma lens is equivalent in strength to a quadrupole magnet with a 150 T/m field gradient. The lens focused a 15 MeV, 16 nC electron beam with initial dimensions {sigma}{sub x,y} {approx} 650 {micro}m and {sigma}{sub z} {approx} 6.5 mm onto an optical transition radiation (OTR) screen {approx}2 cm downstream of the lens. The average transverse area of the plasma focused electron beam was typically demagnified by a factor of 23. The evolution of the beam envelope in the area near the beam waist was measured for both round beams and asymmetric beams with x:y aspect ratios as large as 1:5. The light from the OTR screen in the round beam case was also imaged into a streak camera in order to directly measure the correlation between z and {sigma}{sub r} within the beam.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
923531
Report Number(s):
FERMILAB-CONF-05-654-AD
TRN: US0801864
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Journal Name: Int.J.Mod.Phys.A22:3979-3987,2007; Conference: Prepared for Workshop on the Physics and Applications of High Brightness Electron Beams (PAHBEB 2005), Erice, Sicily, Italy, 9-14 Oct 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ASPECT RATIO; BRIGHTNESS; DIMENSIONS; ELECTROMAGNETIC LENSES; ELECTRON BEAMS; MAGNETS; PHYSICS; PLASMA; QUADRUPOLES; SCREENS; STREAK CAMERAS; TRANSITION RADIATION; Accelerators

Citation Formats

Thompson, M.C., Badakov, H., Rosenzweig, J.B., Travish, G., /UCLA, Edwards, H., Fliller, R., Kazakevich, G.M., Piot, P., Santucci, J., /Fermilab, Li, J., Tikhoplav, R., and /Rochester U.. Results from the UCLA/FNPL underdense plasma lens experiment. United States: N. p., 2007. Web. doi:10.1142/S0217751X0703755X.
Thompson, M.C., Badakov, H., Rosenzweig, J.B., Travish, G., /UCLA, Edwards, H., Fliller, R., Kazakevich, G.M., Piot, P., Santucci, J., /Fermilab, Li, J., Tikhoplav, R., & /Rochester U.. Results from the UCLA/FNPL underdense plasma lens experiment. United States. doi:10.1142/S0217751X0703755X.
Thompson, M.C., Badakov, H., Rosenzweig, J.B., Travish, G., /UCLA, Edwards, H., Fliller, R., Kazakevich, G.M., Piot, P., Santucci, J., /Fermilab, Li, J., Tikhoplav, R., and /Rochester U.. Mon . "Results from the UCLA/FNPL underdense plasma lens experiment". United States. doi:10.1142/S0217751X0703755X. https://www.osti.gov/servlets/purl/923531.
@article{osti_923531,
title = {Results from the UCLA/FNPL underdense plasma lens experiment},
author = {Thompson, M.C. and Badakov, H. and Rosenzweig, J.B. and Travish, G. and /UCLA and Edwards, H. and Fliller, R. and Kazakevich, G.M. and Piot, P. and Santucci, J. and /Fermilab and Li, J. and Tikhoplav, R. and /Rochester U.},
abstractNote = {A gaussian underdense plasma lens with peak density 5 x 10{sup 12} cm{sup -3} and a full width half maximum (FWHM) length of 2.2 cm has been used to focus a relativistic electron beam. This plasma lens is equivalent in strength to a quadrupole magnet with a 150 T/m field gradient. The lens focused a 15 MeV, 16 nC electron beam with initial dimensions {sigma}{sub x,y} {approx} 650 {micro}m and {sigma}{sub z} {approx} 6.5 mm onto an optical transition radiation (OTR) screen {approx}2 cm downstream of the lens. The average transverse area of the plasma focused electron beam was typically demagnified by a factor of 23. The evolution of the beam envelope in the area near the beam waist was measured for both round beams and asymmetric beams with x:y aspect ratios as large as 1:5. The light from the OTR screen in the round beam case was also imaged into a streak camera in order to directly measure the correlation between z and {sigma}{sub r} within the beam.},
doi = {10.1142/S0217751X0703755X},
journal = {Int.J.Mod.Phys.A22:3979-3987,2007},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

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  • A gaussian underdense plasma lens with peak density 5 x 10{sup 12} cm{sup -3} and a full width half maximum (FWHM) length of 2.2 cm has been used to focus a relativistic electron beam. This plasma lens is equivalent in strength to a quadrupole magnet with a 150 T/m field gradient. The lens focused a 15 MeV, 16 nC electron beam with initial dimensions {sigma}{sub x,y} {approx} 650 {micro}m and {sigma}{sub z} {approx} 6.5 mm onto an optical transition radiation (OTR) screen {approx}2 cm downstream of the lens. The average transverse area of the plasma focused electron beam was typicallymore » demagnified by a factor of 23. The evolution of the beam envelope in the area near the beam waist was measured for both round beams and asymmetric beams with x:y aspect ratios as large as 1:5. The light from the OTR screen in the round beam case was also imaged into a streak camera in order to directly measure the correlation between z and {sigma}{sub r} within the beam.« less
  • Focusing of a 15 MeV, 16 nC electron bunch by a gaussian underdense plasma lens operated just beyond the threshold of the underdense condition has been demonstrated. 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. Time resolved measurements of the focused electron bunch are also reported and comparedmore » to simulations.« less
  • Focusing of a 15 MeV, 16 nC electron bunch by a gaussian underdense plasma lens operated just beyond the threshold of the underdense condition has been demonstrated. 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. Time resolved measurements of the focused electron bunch are also reported and comparedmore » to simulations.« less
  • The planned plasma lens experiment at the UCLA Neptune Laboratory is described. In the experiment, electron beams with an energy of 16 MeV, a charge of 4 nC, and a pulse duration of 30 ps [full-width at half-maximum (FWHM)] are designed to be produced from the 1.625-cell photoinjector radio-frequency gun (f = 2.856 GHz) and PWT linac in the Neptune. The generated beams are passed through a thin underdense argon plasma with a density of low 10{sup 12} cm{sup {minus}3} range and a thickness of a few centimeters. For this experiment, a LaB{sub 6}-based discharge plasma source was developed andmore » tested. In this paper, the overview of the planned plasma lens experiment and the test results of the plasma source for various conditions are presented. In addition, computer simulations with a 2{1/2} dimensional particle-in-cell code (MAGIC) were performed and the simulation results are shown.« less