Core cooling studies at LLNL (Lawrence Livermore National Laboratory) and Sandia
Abstract
We are conducting numerical studies and experimental tests at Lawrence Livermore National Laboratory (LLNL) and Sandia National Laboratory (SNL) to determine a method of cooling pulse compression cores that use saturating magnetic material. We anticipate that for high average power throughput compressors, cores will have cooling channels wound at intervals to maintain the maximum temperature below 125 C. We have calculated, for a range of volumetric heating rates, the expected distance between channels using bulk core properties and laminar flow for the cooling fluid. We have completed Freon-113 flow tests on possible cooling-channel materials. We have found that, in tests using ohmically heated cores without cooling channels, we can achieve good agreement between calculated and measured performance by use of the bulk ore properties and assumed film coefficients. A two-dimensional code has been developed to determine core performance using both edge and channel cooling. We are planning additional ohmic heating tests of wound cores to further investigate the performance of the cores, both with and without cooling channels. We will then compare the measured values of temperature, flow rate, and pressure drop with code results.
- Publication:
-
Presented at the International Workshop on Magnetic Pulse Compression
- Pub Date:
- February 1990
- Bibcode:
- 1990mpc..workR..12S
- Keywords:
-
- Cooling;
- Heat Transfer;
- Magnetic Cores;
- Pulse Compression;
- Pulsed Radiation;
- Thermal Conductivity;
- Thermodynamics;
- Diodes;
- Electrical Properties;
- Flow Velocity;
- Hysteresis;
- Mechanical Properties;
- Switches;
- Electronics and Electrical Engineering