Presented by Dan Goodin

1
Overview - Target Technology Sessions Progress
and Challenges
Presented by Dan Goodin HAPL Project
Review General Atomics August 8-9, 2006
2
What are the challenges of Target Technology?

• Fabricating the target

Foam 176 ?m
3
Top-level challenge/goal

• Showing feasibility of making 500,000 targets
  per day for commercial fusion
• Some basic steps in getting there
• Developing processes
• Making the first one demonstrating on the
  table-top
• Mass-production processes
• Doing it economically

Target ? electricity value of 3 each (cost
analysis about 16 cents each)
4
A brief step-by-step status report on targets

• Foam capsule

Process
Micro- encapsulation
Working on yield curves.
?
Composition Density Geometry Pore
Size Non-concentricity
?
?
?
?
5
(Continued) status report on targets

• Capsule overcoat

• Interfacial polymerization
• Glow discharge polymer

X
Gastight Smooth Yield
GDP coater
X
Rxn at interface
Parametric studies, alternate chemistries.
X

• Metal overcoat

Sputter coating
?
Feasibility
Au/Pd
6
(Continued) status report on targets

• Filling with DT

Permeation thru overcoat
?
Calculations Practice
TBD
Hi-P cell
Part of layering demo.
Highly isothermal conditions

• Layering

MPLX
?
Calculations Practice
1
TBD

• Cryo-fluidized bed
• Learn from ICF

Fluidized bed
7
(Continued) status report on targets

• Injection

• Gas-gun (?400 m/s)
• EM accelerator (? 400 m/s)
• Mechanical (50-100 m/s)
• EM Slingshot (?100 m/s)

?
Initial Demos Calculations
?
Centered shuttle
Decide on prototypic injector, couple w/tracking.
Various optical systems and fast steering mirrors

• Tracking/engagement

?
Concepts Demos
?
Optical table demos

• Demo individual systems, integrate
• Hit-on-fly demo with required accuracy

8
Target highlights - what you will hear in this
session

• Non-concentricity (NC) improvements
• Is this enough for basic feasibility??
• New cryostat for filling/layering demonstration
• Improved heating cell at LANL shows longer
  lifetimes during heat exposure
• OMEGA experience in cryotargets and layering
• Sub-micron DT ice inner surface
• Good ice with old DT

9
Highlights continued - what you will hear in this
session

• In-flight target steering to improve target
  placement accuracy
• Progress in optical-table demonstrations of
  target tracking and engagement

10

• Backups

11
A standard target design has been proposed...
350MJ-Class Baseline Target Design, J. Perkins,
10/10/05
Thin High Z coating

• DVB Foam capsule
• 4.6 mm OD, 176 ?m wall
• 100 mg/cc, pores lt3 ?m
• wall uniformity lt1 of radius
• PVP Overcoat
• 5?m
• buckle strength for filling in few hours
• Metal layer
• 800 Å of 50/50 Au/Pd?
• 90 reflectivity in IR
• outer surface finish of 50 nm

CH Overcoat
Foam DT
DT
DT Vapor
2.3 mm
Cryo at 17.3K
? range from 300Å Au to 1200Å Pd or in between