Probing the sheath electric field with a crystal lattice by using thermophoresis in dusty plasma
Victor Land, Bernard Smith, Lorin Matthews, Truell Hyde
TL;DR
This study uses thermophoresis to manipulate and analyze a dust crystal in plasma, enabling the measurement of sheath electric fields and confirming levitation near the Bohm point.
Contribution
It introduces a novel method combining thermophoresis and lattice analysis to probe sheath electric fields in dusty plasma.
Findings
Electric field in sheath reconstructed from force balance.
Dust crystal levitated mainly above and below Bohm point.
Method provides a new way to measure sheath electric fields.
Abstract
A two-dimensional dust crystal levitated in the sheath of a modified Gaseous Electronics Conference (GEC) reference cell is manipulated by heating or cooling the lower electrode. The dust charge is obtained by measuring global characteristics of the levitated crystal obtained from top-view pictures. From the force balance, the electric field in the sheath is reconstructed. From the Bohm criterion, we conclude that the dust crystal is levitated mainly above and just below the classical Bohm point.
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