Journal of Directed Energy (Limited Edition)
Volume 3 Summer 2013

The papers listed below constitute Volume 3 of the Journal of Directed Energy, Limited Edition.
Persons with the necessary credentials can obtain copies of the individual papers by contacting

High Energy Laser (HEL) Experimental and Theoretical Investigation of Laser Spot Size, Aimpoint, and Incidence Angle on High Explosive (HE) Cook-Off (No.1)
The Naval Surface Warfare Center Dahlgren Division conducted a test during August and September 2009 at Fort AP Hill's Demolition Site 71A under the sponsorship of the Office of Naval Research Code 30. The objective of the test was to measure the time required to destroy mortar targets under varied laser radiation conditions using high energy fiber lasers. The testing campaign successfully destroyed thirty (30) 60-mm mortars. The laser conditions were varied to represent realistic conditions that will occur during a laser intercept of a mortar target; laser spot size, aimpoint, incidence angle, and power were all varied. The tests were conducted under documented laser conditions and simulated environmental conditions such as airflow and spin rate. This report describes the test setup & equipment used and also presents the lethality measurements as failure times for 24 of the 30 60-mm mortar tests. This report presents an analytical technique for failure time prediction utilizing both one-dimensional and two-dimensional heat transfer solutions to examine spot size, aimpoint, and incidence angle. Finally the report compares test results to both analytical and numerical computations.
An Investigation of HEL Lethality on Unmanned Aerial Systems (UAS) (No.2)
In response to a request from the services, the High Energy Laser Joint Technology Office (HEL-JTO) directed a study to assess the viability of HELs as a counter to threat UAS. These systems pose a threat to current and future military forces. This report describes that assessment. A first order threat assessment and a review of threats is described. A failure modes and effects analysis (FMEA) for threat systems is undertaken. The FMEA established requirements for a quick-look set of lethality tests on selected critical UAS components. Component and system lethality was estimated and compared in a system context that considered operational factors as well as lethality.

Journal of Directed Energy, Limited Edition, Volume 3

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