1. 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

2. 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

3. 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

4. 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

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

7. 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

8. 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