Physical picture of immersed diode experiments on HERMES III and SABRE

Title: Physical picture of immersed diode experiments on HERMES III and SABRE

Full Record
Other Related Research

Abstract

A needle-like, high-current, electron beam has been produced on the Hermes III and SABRE accelerators at SNL using inductive voltage adder (IVA) technology, and a diode consisting of a needle cathode and a planar anode/bremmstrahlung converter which are both fully immersed in a strong solenoidal magnetic field (12--50 T). Desired nominal parameters are 10 MV, 40 kA, 0.5 mm radius cathode, and 5--35 cm anode-cathode gaps. High dose and small x-ray spot size are required for radiography applications. Results are presented of initial experiments on Hermes III and SABRE, which have produced doses up to 1 kRad {at} 1 meter, and at lower doses, spot sizes as small as 1.7 mm diameter.

Authors:

Olson, C L; Mazarakis, M G; Menge, P R ^[1]

Sandia National Labs., Albuquerque, NM (United States); and others

Publication Date:: 1998-12-31

Research Org.:: Sandia National Laboratory

Sponsoring Org.:: USDOE, Washington, DC (United States)

OSTI Identifier:: 343610

Report Number(s):: CONF-980601-
Journal ID: ISSN 0730-9244; TRN: 99:005987

DOE Contract Number:: AC04-94AL85000

Resource Type:: Conference

Resource Relation:: Conference: 25. international conference on plasma science, Raleigh, NC (United States), 1-4 Jun 1998; Other Information: PBD: 1998; Related Information: Is Part Of IEEE conference record -- Abstracts. 1998 IEEE international conference on plasma science; PB: 343 p.

Country of Publication:: United States

Language:: English

Subject:: 07 ISOTOPE AND RADIATION SOURCE TECHNOLOGY; ELECTRON BEAMS; BEAM PRODUCTION; X-RAY SOURCES; X-RAY RADIOGRAPHY; PLASMA PRODUCTION; THERMIONIC DIODES

Citation Formats


                    Olson, C L, Mazarakis, M G, and Menge, P R. Physical picture of immersed diode experiments on HERMES III and SABRE.  United States: N. p., 1998. 
        Web.

Copy to clipboard


                    Olson, C L, Mazarakis, M G, & Menge, P R. Physical picture of immersed diode experiments on HERMES III and SABRE.  United States.

Copy to clipboard


                    Olson, C L, Mazarakis, M G, and Menge, P R. Thu .  
        "Physical picture of immersed diode experiments on HERMES III and SABRE".  United States.

Copy to clipboard


                    
@article{osti_343610,

  title        = {Physical picture of immersed diode experiments on HERMES III and SABRE},

  author       = {Olson, C L and Mazarakis, M G and Menge, P R},

  abstractNote = {A needle-like, high-current, electron beam has been produced on the Hermes III and SABRE accelerators at SNL using inductive voltage adder (IVA) technology, and a diode consisting of a needle cathode and a planar anode/bremmstrahlung converter which are both fully immersed in a strong solenoidal magnetic field (12--50 T). Desired nominal parameters are 10 MV, 40 kA, 0.5 mm radius cathode, and 5--35 cm anode-cathode gaps. High dose and small x-ray spot size are required for radiography applications. Results are presented of initial experiments on Hermes III and SABRE, which have produced doses up to 1 kRad {at} 1 meter, and at lower doses, spot sizes as small as 1.7 mm diameter.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/343610},
  journal      = {},

  issn         = {0730-9244},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {1998},

  month        = {12}

}

Copy to clipboard

Conference:

Other availability

Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Linear inductive voltage adders (IVA) for advanced hydrodynamic radiography

Conference Mazarakis, M G ; Boyes, J D ; Johnson, D L

The electron beam which drifts through the multiple cavities of conventional induction linacs (LIA) is replaced in an IVA by a cylindrical metal conductor which extends along the entire length of the device and effectuates the addition of the accelerator cavity voltages. In the approach to radiography, the linear inductive voltage adder drives a magnetically immersed electron diode with a millimeter diameter cathode electrode and a planar anode/bremsstrahlung converter. Both anode and cathode electrodes are immersed in a strong (15--50 T) solenoidal magnetic field. The electron beam cross section is approximately of the same size as the cathode needle andmore »« less
Full Text Available
Impedance reduction mechanisms in a magnetically immersed electron diode

Conference Welch, D R

The successful operation of a magnetically-immersed electron diode using inductive-voltage-adder (IVA) technology for radiography requires a stable impedance for > 30 ns. In an IVA, the voltages from many acceleration gaps are added in series along a magnetically-insulated transmission line. The final voltage is applied to a thin needle that is immersed in a 10--50 Tesla solenoidal magnetic field. An electron beam is produced in a small spot at the anode target (<2 mm) with high current (30--50 kA) and energy (>10 MV). The electron current flowing off the needle is determined by the space-charge limited flow in a longmore »« less
Microclump effects in magnetically-immersed electron diodes

Conference Olson, C L

Magnetically-immersed electron diodes are being developed to produce needle-like, high-current, electron beams for radiography applications. An immersed diode consists of a needle cathode and a planar anode/bremmstrahlung converter which are both immersed in a strong solenoidal magnetic field (12--50 T); nominal parameters are 10 MV, 40 kA, 0.5 mm radius cathode, and 5--35 cm anode-cathode gaps. A physical picture of normal and abnormal diode behavior is emerging. Normal diode behavior occurs for times 0 {le} t {le} {tau}, where the transition time {tau} is typically 30 ns; during this time, bipolar space-charge limited flow occurs, which scales well to desiredmore »« less
Design of a Radiographic Integrated Test Stand (RITS) Based on a Voltage Adder, To Drive a Diode Immersed in a High Magnetic Field

Conference Bailey, V L ; Corcoran, P ; Droemer, D ; ...

Recent experiments (1) have adapted existing magne-tically insulated induction voltage adders (Sabre, Hermes III) to drive a 10 MV diode immersed in magnetic fields as high as 50 T. In such a diode, an electron beam of tens of kA can be confined by the magnetic field to a diameter of about 1 mm, and when it strikes a high-Z anode it can create a bremsstrahlung x-ray source intense enough to radiograph massive objects with high resolution. RITS is an adder system designed specially to drive such diodes, and it will be used to develop and exploit them. As inmore »« less
Experiments investigating the generation and transport of 10--12 MeV, 30-kA, mm-size electron beams with linear inductive voltage adders

Conference Mazarakis, M G ; Poukey, J W ; Maenchen, J E

The authors present the design, analysis, and results of the high-brightness electron beam experiments currently under investigation at Sandia National Laboratories. The anticipated beam parameters are the following: 8--12 MeV, 35--50 kA, 30--60 ns FWHM, and 0.5-mm rms beam radius. The accelerators utilized are SABRE and HERMES III. Both are linear inductive voltage adders modified to higher impedance and fitted with magnetically immersed foil less electron diodes. In the strong 20--50 Tesla solenoidal magnetic field of the diode, mm-size electron beams are generated and propagated to a beam stop. The electron beam is field emitted from mm-diameter needle-shaped cathode electrodemore »« less
Full Text Available

Similar Records