USE OF ELECTRON BEAM GUN FOR HARD ROCK EXCAVATION

BECAUSE OF ALIGNMENT PROBLEMS, OUTPUT POWER OF THE ELECTRON BEAM GUN (EBG), NOT FUNDED BY THE CONTRACT, HAS BEEN RESTRICTED TO ABOUT 12 KW. INSTALLATION OF BEAM POSITION SENSORS AND A CLOSED-LOOP BEAM POSITIONING SYSTEM SHOULD PERMIT CONTINUOUS OPERATION AT THE DESIRED 36-KW LEVEL. THERMAL STRESS CALCULATIONS OF THE SECOND QUARTERLY REPORT HAVE BEEN REPEATED FOR A REDUCED THERMAL DIFFUSIVITY. THE RESULTS ARE SIMILAR EXCEPT THAT THE WIDTH OF THE STRESSED REGION IS REDUCED BY 15 TO 20 PERCENT. COMPUTER PLOTS OF THE PROBABILITY DENSITY SHOW THE POINTS AT WHICH CRACKS ARE MOST LIKELY TO START. /AUTHOR/

• Corporate Authors:

  Westinghouse Electric Corporation

  Westinghouse Building
  Pittsburgh, PA  United States  15222
• Authors:
  • Nixon, D R
  • Schumacher, B W
• Publication Date: 1971-10-30

Media Info

• Serial:
  • Issue Number: o 3

Subject/Index Terms

• TRT Terms: Calculation; Computers; Diffusivity; Electron beams; Electrons; Guns; Rock excavation; Sensors; Thermal stresses
• Uncontrolled Terms: Computation
• Old TRIS Terms: Electron guns; Plotting
• Subject Areas: Construction; Geotechnology; Highways; Security and Emergencies;

Filing Info

• Accession Number: 00215575
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: Quar Tech R
• Files: TRIS
• Created Date: Jun 19 1973 12:00AM