Contiguous Gridded Gun Development Program.
Abstract
A gridded gun, suitable for operating megawatt level linear beam tubes, has been designed and tested at lower levels in a beam analyzer. The new gun features a shadow grid in contact with the cathode surface. A major goal was to achieve low control grid interception. Guns with contiguous grid systems are in common use in low and medium power tubes. The purpose of this program was to extend existing lower power gridded gun technology to the megawatt level. The basic gun parameters including beam diameter, voltage, current, perveance and grid operating voltage are all quite conservative and readily achievable in an 83 kV gun. The most critical requirement was that the maximum outer diameter of the gun assembly not exceed 5.48 inches. This limit forced a compromise between cathode emission density and high voltage gradients and dictated the use of a tungsten matrix cathode. A scale model gun was built and tested in a beam analyzer. After modification to the design, a full-scale gun was built and also tested in the beam analyzer. Extrapolations from the beam analyzer test data show that the gun should meet all performance objectives at full power except for heater power and grid bias voltage. The intercepted control grid current cannot be accurately estimated for full power operation, but it is believed that it will be less than the 40 milliamps specified.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1980
- Accession Number
- ADA084046
Entities
People
- Glen Huffman