Development of Electron Gun with Non-Intercepting Grids
Abstract
Studies were conducted and tests performed covering the following categories: Operation of the 0.570-inch radius cathode, multi-electrode gun using hexagonal aligned grids in the beam tester showed substantial improvement in the beam profile over previous efforts. Beam diameter of approximately 0.110-inch was obtained. A pair of aligned grids having 0.030-inch square openings and 0.002-inch wire width was non-intercepting when operated with a 0.570-inch spherical radius cathode and a 0.375-inch spherical radius anode. A spherical anode (R = 0.295) was installed in place of the regular anode on the 0.570-inch radius cathode gun using hexagonal mesh aligned grids (83% open). Additional pairs of aligned grids were made. Hexagonal mesh molybdenum grids were shown to be an improvement over square mesh. Cathode heater fields were shown to affect the beam shape by increasing its diameter about 10% as was discussed in Quarterly Report 3. Cathode heater fields were shown to influence grid interception when a spherical anode was spaced 2 to 3 times the optimum (concentric) distance from the cathode. One polarity provided lower grid interception than that obtained from zero heater current operation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 28, 1964
- Accession Number
- AD0452890
Entities
People
- Joseph Drees
- Marshall Mcdonald