Abstract
This paper introduces new concepts for high-efficiency, high-output neutron generators for the well-logging industry, incorporating planar field ionization (FI) ion sources, which can provide for an order of magnitude higher neutron yield at a fraction of the power of conventional designs. Neutron generators for the well-logging industry primarily use electron-impact ion sources, which have low ionization efficiency and less than 10% monatomic ion production. A magnetic field or higher gas pressure is often required for improving ionization at the expense of lower reliability, average neutron yield, and large Tritium activity. The planar, FI ion source concept was investigated, and studies of a 100-µA ion-beam interaction with a thin Titanium target shows the target’s temperature at maximum operating conditions, never exceeding the Tritium desorption temperature. Particle-in-cell (PIC) simulation software was used for simulating the ion-beam transport from the planar, FI ion source, resulting in a mostly ideal beam transport covering the entire surface of the target, which reduces the target’s operating temperature and, thus, eliminates T desorption, allowing for approximately an order of magnitude higher neutron yield, higher logging speed, and a significant reduction in rig time, as well as substantial cost savings.
