Electron accelerator for tunneling through hard rock

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Earlier work demonstrated that intense sub-microsecond bursts of energetic electrons cause significant pulverization and spalling of a variety of rock types. The spall debris generally consists of sand, dust, and small flakes. If carried out at rapid repetition rate, this can lead to a promising technique for increasing the speed and reducing the cost of underground excavation of tunnels, mines, and storage spaces. The conceptual design features of a Pulsed Electron Tunnel Excavator capable of tunneling approximately ten times faster than conventional drill/blast methods are presented, with primary emphasis on the electron accelerator and only a brief description of the ... continued below

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21 p.

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Avery, R.T. & Keefe, D. October 1, 1975.

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Description

Earlier work demonstrated that intense sub-microsecond bursts of energetic electrons cause significant pulverization and spalling of a variety of rock types. The spall debris generally consists of sand, dust, and small flakes. If carried out at rapid repetition rate, this can lead to a promising technique for increasing the speed and reducing the cost of underground excavation of tunnels, mines, and storage spaces. The conceptual design features of a Pulsed Electron Tunnel Excavator capable of tunneling approximately ten times faster than conventional drill/blast methods are presented, with primary emphasis on the electron accelerator and only a brief description of the tunneling aspects. Of several candidate types of accelerators, a linear induction accelerator producing electron pulses (5 MV, 5 kA, 1.0 $mu$s = 25 kJ) at a 360 Hz rate was selected for the conceptual example. This provides the required average electron beam power output of 9 MW. The feasibility of such an accelerator is discussed.

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21 p.

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Dep. NTIS

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  • 1. international topical conference on electron beam research and technology, Albuquerque, New Mexico, USA, 3 Nov 1975

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  • Report No.: LBL--4231
  • Report No.: CONF-751108--21
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 4038680
  • Archival Resource Key: ark:/67531/metadc864579

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 1, 1975

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 12, 2017, 4:37 p.m.

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Avery, R.T. & Keefe, D. Electron accelerator for tunneling through hard rock, article, October 1, 1975; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc864579/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.