Target Technology Development in Support of NRL Laser Plasma Program N. Alexander, G. Besenbruch, D. Goodin, J. Hoffer, A. Nobile, R. Petzoldt, J. Saurwein, K. Schultz, A. Schwendt, W. Steckle February 6-7, 2001 Naval Research Laboratory, Washington

Topics Critical issues for target fabrication and injection Five-year integrated plan for target technology Logic diagram Schedule Summary of tasks Task objectives, deliverables, costs Topical presentations

Target fabrication and injection critical issues to be addressed IFE Target Fabrication Target Injection Ability to fabricate target materials Ability to fabricate them economically Ability to fabricate, assemble, fill and layer at the required rates Withstand acceleration during injection Survive thermal environment Accuracy & repeatability Ability to accurately track targets NRL Radiation Preheat Target …. Target designs to be addressed include the NRL radiation preheat target

The 5-year Integrated Plan is built upon this logic diagram Target Fabrication and Injection Logic Flow Gold Overcoat for Rad Preheat Target Characterization Of Foam Shells Target design Work (NRL) Target Injection Accuracy & Track Electromagnetic Accelerator Experimental Injector Design Foam shells for Direct Drive Low inventory Filling methods Target Thermal Response Mass Production Layering Methods Target Property Measurements Fluidized Bed Cryogenic Target Handling Foam Shell Target Fabrication Tasks Injection Preliminary Target Designs specified Target Designs Specified (complete) Gold Overcoat for Rad Preheat Target Characterization Of Foam Shells Target design Work (NRL) Target Injection Accuracy & Track Electromagnetic Accelerator Experimental Injector Design Foam shells for Direct Drive Low inventory Filling methods Target Thermal Response Mass Production Layering Methods Target Property Measurements Fluidized Bed Cryogenic Target Handling Foam Shell Prototype Direct Drive Target Fabricated Fabricate Single Prototype Direct Drive Target The 5-year Integrated Plan is built upon this logic diagram Demonstrate Tracking Accuracy Fill, Layer and Thermal Exposure Demonstrated Integrated Decision on Baseline Direct Drive Target Baseline IRE Target Selected Demonstrate Pilot-Scale Shell Production Engineering Design of Cryo Injector Fill system Demo Continuous Shell Production Demonstrated Fill/Injector Demonstration Target Fab, Fill And Injection Demonstrated and ready for IRE

Summary of LANL/GA target fabrication tasks HIB Indirect Drive WBS numbers from NRL HAPL FY2001 Implementation Plan

3.5.3.1 Fluidized bed for mass-production of shells Overall Purpose: Bring industrial technologies to IFE target fabrication - $120K extend scope of OFES grant for fluidized bed to include wider range of process conditions and focus on higher-strength/permeability materials explore feasibility for low-cost mass production Deliverable: Document as part of IFE Target Scale-Up Report, Feb. 2002 Electron microscope photo showing ~3 m polymer coating as deposited in fluidized bed Coating Layer Mandrel PAMS Fluidized bed with about 500 ~2 mm OD mandrels ready for coating …. first attempts at coating in a fluidized bed were encouraging

3.5.3.3 Foam shell mass production Overall Purpose: Perform evaluations and scoping experiments for “one-step” concept of foam shell/overcoat production - $100K Scoping experiments for concept evaluation Evaluate methods for scaleup Deliverable: Document as part of IFE Target Scale-Up Report, Feb. 2002 …. This concept could streamline a future foam shell microencapsulation process