Abstract
Longitudinal phase space and temperature measurements were conducted on a $2--3\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$ long, singly charged ${\mathrm{K}}^{+}$ ion bunch with an ion energy of $\ensuremath{\sim}0.3\text{ }\text{ }\mathrm{MeV}$ and current of 30 mA. The principal objective of these experiments was to measure the longitudinal beam dynamics and study the limits of axial compression. The differences between the measured beam energy, longitudinal beam dynamics, and the amplitude and time history of the Marx voltage waveform were all quantified. Longitudinal phase space measurements indicate a slight chromaticity ($<1%$) in the beam from head to tail. Record low longitudinal temperatures of ${T}_{z}=2--4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}\text{ }\text{ }\mathrm{eV}$ were measured for a beam bunch of this intensity with negligible effects from neutralizing the beam space charge with a background plasma. A qualitative comparison of experimental and calculated results are presented, which include time resolved longitudinal distributions, and phase space of the beam at 430 cm.
Highlights
Space-charge dominated ion beams used in accelerators to heat targets to warm dense matter (WDM) and drive fusion targets face a number of unique challenges
One of particular interest is the limit of axial compression and the longitudinal beam dynamics
An experimental configuration was used to study the limits of axial compression and the longitudinal dynamics of the 0.3-MeV, 30-mA, singly charged Kþ ion beam used on the neutralized drift compression experiment (NDCX)
Summary
Space-charge dominated ion beams used in accelerators to heat targets to warm dense matter (WDM) and drive fusion targets face a number of unique challenges. A Liþ ion beam is extracted through an acceldecel diode at $100 kV with a space-charge limited current
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More From: Physical Review Special Topics - Accelerators and Beams
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