1. July 11, 2003 HAPL e-meeting. 1 Armor Design & Modeling Progress A. René Raffray UCSD HAPL e-meeting July 11, 2003 (1)Provide Parameters for Chamber “System” Studies (2) Investigate Engineering Material Cases

2. July 11, 2003 HAPL e-meeting. 2 Integrated Chamber Armor/FW/Blanket Analysis Required for Chamber System Studies Chamber engineering constraints are set by limits on maximum temperature and cyclic temperature behavior of armor and of structural material (ferritic steel), which depend on: IFE system parameters –e.g. yield, rep rate, chamber size, protective gas density Chamber first wall and blanket design parameters for example configuration -e.g. coolant inlet and outlet temperatures, first wall structural material thickness, armor thickness and properties (including engineered materials) and heat transfer coefficient at coolant Use RACLETTE-IFE code in conjunction with photon and ion energy deposition models to provide series of runs to be used as input data for system studies -Update code to include a second layer in the geometry for modeling W + FS wall with a convective boundary condition at the coolant interface -Add capability to model over many cycles -Compare with other modeling results for consistency (Jake)

3. July 11, 2003 HAPL e-meeting. 3 Example Results Comparing W Temperature Histories for Armor Thicknesses of 0.05 mm and 0.5 mm, respectively 154 MJ yield No gas Rep Rate =10 R chamber = 6.5 m  FS = 2.5mm T coolant = 500°C  W =0.05mm  W =0.5mm Not much difference in maximum W temperature and in number of cycles to ramp up to the maximum temperature level

4. July 11, 2003 HAPL e-meeting. 4 Example Results Comparing FS Temperature Histories for W Armor Thicknesses of 0.05 mm and 0.5 mm, respectively 154 MJ yield No gas Rep Rate =10 R chamber = 6.5 m  FS = 2.5mm T coolant = 500°C Substantial differences in max. T FS and cyclic  T FS at FS/W interface Can adjust T max by varying T coolant and h coolant For given IFE conditions, minimum  W based on allowable fatigue- based cyclic  T FS Desire to separate armor function from structural function --> minimize cyclic  T FS Must be integrated in chamber system modeling  W =0.05mm  W =0.5mm

5. July 11, 2003 HAPL e-meeting. 5 Investigate Engineering Material Cases -PPI plans to develop nano-scaled engineered W for armor applications as part of current SBIR Phase I grant Work with PPI to help optimize material microstructure characteristics (e.g. microstructure characteristic dimension, porosity, pore sizes, heterogeneity) –Minimize resistance to He migration –Provide adequate heat transfer performance –Model effective conductivity –Use RACLETTE-IFE with adjusted material property data and energy deposition input to help understand impact on integrated chamber armor/FW/blanket system Porosity  micro-structure Effective thermal conductivity Effective He transport coefficient Schematic of Anticipated Behavior of Engineered W