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2 LE E fnBE ACELEaRATG NIO L -;ec->< awe 1 JLCTO I UCUI T-I Y 1IJ\ QC062m (24 06I1 - APIDDAI Ci~nUAR XBL 753-555 TBL 763535 Fig. 3. Schematic of one of the Fig. 4. Section at accelerator 64 accelerator modules. unit. The accelerator will require 64 modules each producing 80 kV pulsed voltage (see Fig. 3). Construction of such modules seems reasonably straightforward and by suitable de-rating of compo- nents they can be made highly reliable. It is hoped that igni- trons will work successfully at the 360 Hz rate; if not, more expensive thyratrons would be needed. The electron beam scan- ning could be in a raster-pattern by means of fast electromag- netic deflection in combination with a slow mechanical movement of the scanning pattern. The vacuum window is a serious problem; several potential solutions have been conceived of, but more engineering development is needed on this item. The accelerator proper is only one part of the overall excavator which is designed to operate on a continuous rather than batch basis. The engineering details of the systems required are treated in (1) and Fig. 4 gives an indication of how they are incorporated within the tunnel. The debris is handled by com- bined pneumatic and slurry techniques; a continuously advancing combination of slipform and concrete extrusion creates the tun- nel lining. The ozone and x-ray problems can be handled satis- factorily and induced activity is not a problem. The accelerator and ancillary control systems and materials handling systems are mounted on nine articulated units (1) The authors thank the NSF (RANN) for funding this work and U. S. ERDA for the use of LBL facilities. REFERENCES (1) R. Avery, D. Keefe, T. L. Brekke, and I. Finnie: IEEE Trans. Nucl. Sci. NS-22, 3 (1975), and References quoted herein. (2) 0. Vardar: "Fracture of Brittle Solids under Multi-Axial and Dynamic Loading," Ph.D. Thesis, University of California (1975).
Avery, Robert T.; Keefe, Denis; Brekke, Tor L. & Finnie, Iain.Rock Excavation by Pulsed Electron Beams,
report,
March 1, 1976;
Berkeley, California.
(https://digital.library.unt.edu/ark:/67531/metadc1443035/m1/5/:
accessed July 16, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.