Studies of an Underdense Plasma Lens at the UCLA Neptune Laboratory

Details Studies of an Underdense Plasma Lens at the UCLA Neptune Laboratory Studies of an Underdense Plasma Lens at the UCLA Neptune Laboratory

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..dpp.c2s56c&link_type=abstract

American Physical Society, Division of Plasma Physics Meeting, November 16-20, 1998 New Orleans, LA, abstract #C2S.56

Physics

Plasma Physics

Scientific paper

An experiment on an underdense thin plasma lens is planned at the UCLA Neptune Laboratory. For an underdense plasma lens, where the plasma density is less than the beam density, a nearly uniform ion channel is produced when the beam propagates in the plasma, and this ion channel provides a very strong and aberration-free focusing force. For this kind of underdense plasma lens experiments, a discharge Ar plasma source consisting of a LaB6 cathode and a hollow anode was developed and tested. The result shows that it can give satisfactory plasma parameters for the planned plasma lens experiment, i.e., a plasma density in low 10^12 cm-3 range and an effective length of a few cm. This plasma source will be assembled with the Neptune beam line which is based on the 1.625-cell photoinjector RF gun and PWT linac. Calculations show that a plasma lens with a peak density of 1.1× 10^12 cm-3 and an effective length of 2.9 cm can focus a 400-μm-radius electron beam of 16 MeV, 5 nC, 25 ps duration, 20 mm-mrad normalized emittance to 90 μm in radius and the focual length is about 5.7 cm. Test results of the plasma source, calculation results, and simulation results from the MAGIC (2 and 1/2 cell PIC) code are presented.

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