Update on Roughening Work Jake Blanchard HAPL MWG Fusion Technology Institute University of Wisconsin e-meeting – July 2003.

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Presentation transcript:

Update on Roughening Work Jake Blanchard HAPL MWG Fusion Technology Institute University of Wisconsin e-meeting – July 2003

Agenda Update on Experiment Comparison Thoughts on Measuring Mass Loss Latest Temperature Predictions Initial Fracture Results Progress on Paper

Experiment Comparison Table ExperimentTypeEnergy (keV) Max Fluence per Pulse (J/cm 2 ) Approx Depth of Energy (microns) Max Starting Temperature (C) RHEPPIons ZX-Rays XAPPERX-Rays RT+ UCSDLaser Electraelectrons Infrared q=10 MW/m 2 0 UW IECIons100Flux=5x10^ 19 /m 2 -s 1

Experiment Comparison Table ExperimentMax Sample Size (cm) Flat Top Pulse Width (ns) Rise Time (ns) Max Rep Rate (Hz) Max Number Cycles Sample Actively Cooled? RHEPP100NO Z6 XAPPER2.5 diameter (FWHM ) 101e6NO UCSD1 cm x 1 cm 8103e5NO Electra30 cm x 100 cm k/dYES Infrared>10 msYES UW IECNO

Data to Be Collected in Surface Exposure Experiments BASICS –Name of Facility –Name of Experimentalist DEPOSITION –Energy Deposition type –Energy Spectrum –Deposition Profile –Fluence per Cycle –Number of Cycles –Pulse Width and Rise Time TARGET –Initial Target Temperature –Target Dimensions –Is the target cooled? How? –Target Material(s) –Material Identifier (Code) –Surface Cleaning Process RESULTS –Surface Evaluation Before and After –Mass Loss –Temperature History

How to Measure Mass Loss Weigh Samples before and After Measure Remaining Thickness of Armor (Profilometry, Auger, RBS) Measure What Comes Off (Spectrometry/RGA)

Latest Temperature Predictions Chamber radius (m) Xe Pressure (mTorr) Target Yield (MJ) W Thickness (microns) Peak W temperature in 10 cycles (C) Peak Steel Temperature in 10 cycles (C) Steel Temperature Swing (C) Tcoolant=400 C, h=10,000 W/m2K, steel thickness=3 mm

Fracture Mechanics Analysis of Tungsten Coating Crack tip Crack depth Tungsten Steel Contact surface Crack tip stress intensities during thermal cycling calculated using ANSYS J-integral fracture mechanics algorithm

Thermal Response of Structure Temperature Contours Near Surface at end of Pulse 6.5 m chamber 154 MJ target No gas 50 microns W

Stresses Resulting from Thermal Cycle Stresses at Maximum TemperatureStresses After Cool Down MPa

Transient Stress Intensity (30  m Crack Depth) Fracture Mechanics Analysis Results Maximum stress intensities occur at end of cycle (when structure is cool). Stress intensity decreases with increasing crack depth Stress Intensity vs. Crack Depth After One Thermal Cycle

Next Steps What is effect of crack spacing? What if crack reaches steel?

Paper Outline – My Chapter 3 Armor (Blanchard) –3.1 Prompt threats: Expt and modeling of the response of armor candidates ablation; (Expts: Olson, Rank, Tanaka, Latkowski, Najmabadi. Modeling: Wisc) roughening (Expts: Olson, Rank, Tanaka, Latkowski, Najmabadi. Modeling: Ghoneim, Blanchard) sputtering (Expts ? Modeling: Lucas?) Do we gain anything with EW? (Ghoneim, Raffray) –3.2 Long term threats: Expt and modeling of the response of armor candidates He retention ( EW: Ghoneim, Solid wall: Snead, Expts: Kulcinski) Modeling: thermo-mechanical fatigue long term effects (Blanchard,. ) Expts: thermo-mechanical fatigue long term effects (Latkowski, Najmabadi, Raffray, Ghoneim, (SNL?))