Abstract
In this article, we examine the influences of Ne and He buffer gases under confined Ar + ion cloud in a homemade Paul ion trap in various pressures and confinement times. The trap is of small size (r 0 = 1 cm) operating in a radio frequency (rf) voltage only mode, and has limited accuracy of 13 V. The electron impact and ionization process take place inside the trap and a Faraday cup has been used for the detection. Although the experimental results show that the Ar + ion FWHM with Ne buffer gas is wider than the He buffer gas at the same pressure (1×10 -1 mbar) and confinement time is about 1000 µs, nevertheless, a faster cooling was found with He buffer gas with 500 µs. ultimetly, the obtanied results performed an average cloud tempertures reduced from 1777 K to 448.3 K for Ne (1000 µs) and from 1787.9 K to 469.4 K for He (500 µs)
Highlights
In this article, we examine the influences of Ne and He buffer gases under confined Ar+ ion cloud in a homemade Paul ion trap in various pressures and confinement times
The experimental results show that the Ar+ ion FWHM with Ne buffer gas is wider than the He buffer gas at the same pressure (1×10-1 mbar) and confinement time is about 1000 μs, a faster cooling was found with He buffer gas with 500 μs. ultimetly, the obtanied results performed an average cloud tempertures reduced from 1777 K to 448.3 K for Ne (1000 μs) and from 1787.9 K to 469.4 K for He (500 μs)
One observes a low resolution, caused by Paul ion trap rf voltage accuracy (13 V), which the limit of stability diagram of ions might be missed for ejection
Summary
The damping force F is assumed to be proportional to the velocity ν of the confined ion such as F = -mγν, where m denotes the ion mass, and γ depends on the mobility of particular gas and has unit of s-1. For non-energetic confined ion (up to few eV) the mobility is approximetly constant.[10] Under the damping force, the Mathiu differential equations[11] should be modified and in the u direction, r or z, may be written; All MS Letters content is Open Access, meaning it is accessible online to everyone, without fee and authors’ permission. Redistribution, or reproduction of a work, users must clarify the license terms under which the work was produced
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