PAC2013 - List of Authors (Gilson, E.P.)

Paper	Title	Page
TUPAC24	Studies of Ion Beam Charge Neutralization by Ferroelectric Plasma Sources	499
	A.D. Stepanov, R.C. Davidson, E.P. Gilson, L. Grisham PPPL, Princeton, New Jersey, USA
	Funding: *This work is supported by US DOE contract DE-AC02-09CH11466 Space charge forces limit the possible transverse compression of high perveance ion beams that are used in Heavy Ion Fusion; the minimum radius to which a beam can be focused is an increasing function of perveance. The limit can be overcome if a plasma is introduced in the beam path between the focusing element and the target in order to neutralize the space charge of the beam. This concept is implemented on the Neutralized Drift Compression eXperiment (NDCX) at LBNL using Ferroelectric Plasma Sources (FEPS). FEPS are developed at PPPL where we are currently conducting experiments on beam neutralization by FEPS plasma. A 30-60 keV space charge dominated Argon beam is focused with an Einzel lens into a FEPS located approximately at the waist of the unneutralized beam. The beam is intercepted downstream from the FEPS by a movable Faraday cup array that provides time-resolved 2D current density profiles of the beam spot on target. Our goal is to study the 1) dependence of charge neutralization on FEPS plasma density 2) beam emittance growth, and 3) time-dependent effects due to the short duration of the FEPS discharge, which is on the order of microseconds.

Paper

Title

Page

Studies of Ion Beam Charge Neutralization by Ferroelectric Plasma Sources

499

A.D. Stepanov, R.C. Davidson, E.P. Gilson, L. Grisham
PPPL, Princeton, New Jersey, USA

Funding: *This work is supported by US DOE contract DE-AC02-09CH11466
Space charge forces limit the possible transverse compression of high perveance ion beams that are used in Heavy Ion Fusion; the minimum radius to which a beam can be focused is an increasing function of perveance. The limit can be overcome if a plasma is introduced in the beam path between the focusing element and the target in order to neutralize the space charge of the beam. This concept is implemented on the Neutralized Drift Compression eXperiment (NDCX) at LBNL using Ferroelectric Plasma Sources (FEPS). FEPS are developed at PPPL where we are currently conducting experiments on beam neutralization by FEPS plasma. A 30-60 keV space charge dominated Argon beam is focused with an Einzel lens into a FEPS located approximately at the waist of the unneutralized beam. The beam is intercepted downstream from the FEPS by a movable Faraday cup array that provides time-resolved 2D current density profiles of the beam spot on target. Our goal is to study the 1) dependence of charge neutralization on FEPS plasma density 2) beam emittance growth, and 3) time-dependent effects due to the short duration of the FEPS discharge, which is on the order of microseconds.