Two-Meter Laser Material Response Impulse Measurements
Abstract
Impulse generated by Excimer-Laser-target interaction has been extensively studied at Maxwell Laboratories, Inc. This report presents results of impulse measurements on aluminum targets using the SDIO/MLI Two-Meter Laser operating with KrF as the lasing media. The results of previous MLI impulse measurements using XeF laser media are summarized. The work presented in this report was motivated by earlier impulse measurements also taken on the Two-Meter Laser under S-Cubed's Material Response Contract DNA 001-84-C-0088 (reported in Final Technical Report (Draft) SSS-R-86-7629). The data showed much higher impulse to energy ratios than predicted. Additionally, work done elsewhere gave lower I/E values than those found at MLI. The initial MLI impulse studies used a Fotonic gauge as a velocity sensor. As a check on its accuracy, impulse was measured using a simple pendulum; the results agreed with the Fotonic gauge data. A careful investigation of the pendulum experimental technique followed; no problems were found. The Ss-Cubed ZOOS code was also examined. It is a 1 1/2 - D code, and only accounts for impulse delivered under the Laser footprint. Additional momentum, however, is provided outside the laser spot via the plasma cloud that results from the laser-target interaction. (rrh)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 11, 1988
- Accession Number
- ADA215834
Entities
People
- Karin Robertson
- Michael C. Cates