Patent ID: 8633434
Filing Date: 2014-01-21
Classification: G01N,H05H

Abstract:
1. An apparatus for irradiating an earth formation, comprising: a carrier configured to be disposed in the formation; a neutron tube disposed at the carrier and located on an axis; and a high voltage power source disposed at the carrier and electrically connected to the neutron tube, the high voltage power source being offset from the axis; and a conduction segment configured to electrically connect the high voltage power supply to the neutron tube, the conduction segment including a high voltage conductor and a plurality of insulating materials surrounding the high voltage conductor, each of the plurality of insulating materials configured to withstand downhole conditions and having a different permittivity, at least one of the plurality of insulating materials being a solid layer of insulating material, the conduction segment including a support structure having the solid layer of insulating material and an outer support tube surrounding the plurality of insulating materials, the support structure configured to maintain the conduction segment along a fixed offset path between the neutron tube and the high voltage power source and maintain each of the plurality of insulating materials at a constant thickness.