Patent ID: 9362098
Filing Date: 2016-06-07
CPC Classification: H01J

Claim Text:
1. An ion optical element comprising: an outer ceramic tube made of a second ceramic material; an inner ceramic tube made of a first ceramic material within and concentric to the outer ceramic tube, wherein the inner ceramic tube fits closely within the outer ceramic tube and is in thermal contact with the outer ceramic tube; an electric heater configured to heat the outer ceramic tube; a first conductive element at an entrance end of the inner ceramic tube; a DC voltage power supply applying a DC voltage between the entrance end of the inner ceramic tube and an opposite end of the inner ceramic tube, wherein the first ceramic material is characterized by a first room temperature electrical resistivity and a first room temperature thermal conductivity, and wherein the second ceramic material is characterized by a second room temperature electrical resistivity and a second room temperature thermal conductivity, and wherein the second room temperature electrical resistivity is higher than the first room temperature electrical resistivity by at least two orders of magnitude.