Operating Windows for W Coated Steel in IFE Chamber

1
Operating Windows for W Coated Steel in IFE
Chamber
June 6, 2003

• Fusion Technology Institute
• University of Wisconsin

2
What Should Be Chosen as the Failure Criteria?

• Vaporization? (4-5,000 C)
• Melting? (3,410 C)
• Surface Roughening? ( 3,000 C)
• Other?? (lt 3,000 C)

3
Chamber Radius Needed to Avoid Exceeding 3,000 C
10 mTorr gas pressure 400 C coolant temperature
4
Several Parameters Will Be Varied Over the Summer
to Refine the HAPL/W Limits

• Starting Temperature (400-1,000 C)
• Moderate gas pressure variation (1-100 mT)
• Vaporization Limit
• Melting Limit
• Experimental Roughening Limit
• Blistering Limit