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Effect of a Decelerating Grid on Current from an Ion Source

Description: Abstract: "A theoretical criterion is given for the conditions under which the ions from an ion source may be decelerated by a decelerating grid, following the accelerating grid which extracts ions from the emitter, without causing a reduction in the current supplied by the source."
Date: February 23, 1955
Creator: Bing, George F., 1924-; Gardner, C. S. & Northrop, Theodore G.
Partner: UNT Libraries Government Documents Department

Note on Table Top Injection : High Energy Injection Inside the Mirrors

Description: "High energy injection into Table Top is discussed for the case in which the ion sources are to be located inside the mirrors in the mirror region. Two typical ion source geometries are considered. maximum time intervals available for injection indicated are on the order of 7 to 25 microseconds."
Date: August 26, 1955
Creator: Hiskes, J. R.
Partner: UNT Libraries Government Documents Department

Occluded-Gas Ion Source

Description: "Characteristics of a pulsed, occluded-gas ion source, operating in a magnetic field, have been investigated. Mass spectra of hydrogen- and deuterium-loaded sources are presented. Constructional details of the source and its operating characteristics are discussed."
Date: June 27, 1956
Creator: Ehlers, Kenneth W.
Partner: UNT Libraries Government Documents Department

Preliminary evaluation of a modified Mueller--Hortig geometry negative ion source using a negative ion source test facility

Description: A negative sputter-type ion source of the Mueller-Hortig geometry is described which utilizes a positive surface ionization source. Among the ion beams which have been produced are: Al-0.2 $mu$A; All0$sup -$-3 $mu$A; Au$sup -$- 6 $mu$A; C$sup -$-25 $mu$A; C$sub 2$$sup -$-20$mu$A; Cl$sup -$-100 $mu$A; Cu$sup - $-0.5 $mu$A; CuO$sup -$-0.8 $mu$A; F$sup -$-40 $mu$A; I$sup -$-26 $mu$A; 0$sup -$- 30 $mu$A; Pt$sup -$-3 $mu$A; S$sup -$-44 $mu$A; TaO$sub 2$$sup -$-2 $mu$A. The yields of Cl$sup -$, F$sup -$, O$sup -$, and S$sup -$ produced from gaseous or high vapor pressure compounds are observed to be sensitively dependent on the metallic surface from which they are generated, indicating an intermediate surface chemical effect. While the source produces very intense beams of the halogens, sulfur, and oxygen and relatively intense beams of the metallic oxides, there appears to be a need for additional surface cesium to ensure maximum negative ion yields from many of the elemental materials. (auth)
Date: January 1, 1975
Creator: Alton, G.D.
Partner: UNT Libraries Government Documents Department

Progress report on VENUS

Description: The construction of VENUS, a next generation superconducting Electron Cyclotron Resonance ion source designed to operate at 28 GHz, is complete. The cryostat including the superconducting magnet assembly was delivered in September 2001. During acceptance tests, the superconducting magnets produced an axial magnetic field strength of 4T at injection, 3T at extraction, and a radial field strength of 2T at the plasma chamber wall without any quenches. These fields are sufficient for optimum operation at 28 GHz. The cryogenic system for VENUS has been designed to operate at 4.2 K with two cryocoolers each providing up to 45 W of cooling at 50 K and 1.5 W at 4 K in a closed loop mode without further helium transfers. However, during the acceptance tests an excessive heat leak of about 3W was measured. In addition, the liquid helium heat exchanger did not work properly and had to be redesigned. The cryogenic system modifications will be described. In addition, an update on the installation of the ion source and its beam line components will be given.
Date: September 3, 2002
Creator: Leitner, Matthaeus A.; Leitner, Daniela; Abbott, Steve R.; Taylor, Clyde E. & Lyneis, Claude
Partner: UNT Libraries Government Documents Department

Table Top Ion Source

Description: Report discussing experiments to evaluate ion sources for possible use in a thermonuclear reactor.
Date: June 16, 1954
Creator: Ford, Franklin O. & Zizzo, Samuel G.
Partner: UNT Libraries Government Documents Department

Shock Ionization Source and Preliminary Experiments

Description: Report discussing a study regarding the possibility of using shock ionization as a source for mirror-type thermonuclear reactors. This was tested in a one-inch vacuum system, and though initial ionization and temperature produced was low, the magnetic field extended the time of light emission and compressed the luminous region.
Date: November 1954
Creator: Coensgen, Frederic H.; Hales, Richard Wayne & Howard, J. C.
Partner: UNT Libraries Government Documents Department

Toy Top Plasma Injector

Description: Introduction: "It is the purpose of this note to describe the construction and operation of the plasma injectors used in the magnetic high compression experiments in progress at the Lawrence Radiation Laboratory at Livermore. As the investigations of these injections is still in progress, remarks concerning their operation or the characteristics of the injected plasma are of a tentative nature."
Date: May 28, 1959
Creator: Coensgen, F. H.; Cummins, W. & Sherman, A.
Partner: UNT Libraries Government Documents Department

RF Driven Multicusp H- Ion Source

Description: An rf driven multicusp source capable of generating 1-ms H{sup -} beam pulses with a repetition rate as high as 150 Hz has been developed. This source can be operated with a filament or other types of starter. There is almost no lifetime limitation and a clean plasma can be maintained for a long period of operation. It is demonstrated that rf power as high as 25 kW could be coupled inductively to the plasma via a glass-coated copper-coil antenna. The extracted H{sup -} current density achieved is about 200 mA/cm{sup 2}.
Date: June 1, 1990
Creator: Leung, K.N.; DeVries, G.J.; DiVergilio, W.F.; Hamm, R.W.; Hauck, C.A.; Kunkel, W.B. et al.
Partner: UNT Libraries Government Documents Department

Primary ion sources for EBIS

Description: This paper gives an introduction into the topic of primary ion sources that can be used to feed ions of normally solid elements into EBIS devices. Starting with a set of typical requirements for primary ion sources, some major types of ion generators are discussed first, with emphasis on their working principles rather than trying to give a fully representative listing of used and proposed generators. Beam-transport issues between primary ion source and EBIS are then examined, and generic characteristics of suitable beam-formation and transport systems are explained.
Date: March 21, 2001
Creator: Keller, R.
Partner: UNT Libraries Government Documents Department


Description: A test stand for the investigation of 1+-n+ charge boosting using an ECR ion sources is currently being assembled at the Texas A&M Cyclotron Institute. The ultimate goal is to relate the charge-boosting of ions of stable species to possible charge-boosting of ions of radioactive species extracted from the diverse, low-charge-state ion sources developed for radioactive ion beams.
Date: April 7, 2006
Creator: May, Donald P.
Partner: UNT Libraries Government Documents Department

MeVVA source of primary metallic ions for SuperEBIS. Informal report

Description: Generation of high charge state heavy metallic ions including uranium has been successful in a number of EBIS (Electron Beam Ion Source) devices. The best results have been obtained in devices utilizing injection of primary, low charge state, ions from an external ion source into the EBIS trap for further ionization into higher charge states. In one such device, named EBIT (Electron Beam Ion Trap), a MeVVA ion source is used as an injector of primary metallic ions into the EBIT trap. The authors fabricated and experimented with a MeVVA metallic ion source. This source was recently installed on SuperEBIS, and has successfully injected titanium and uranium ions into the SuperEBIS trap.
Date: June 2, 1994
Creator: Hershcovitch, A.; Kponou, A. & McCafferty, D.
Partner: UNT Libraries Government Documents Department

Design aspects for a pulsed-mode, high intensity, heavy negative ion source

Description: A high-intensity, plasma-sputter, negative ion source, which utilizes multi-cusp, magnetic-field, plasma-confinement techniques, has been designed at the Oak Ridge National Laboratory (ORNL). The source is an axial-geometry version of the radial-geometry source which has demonstrated pulsed-mode peak intensity levels of several mA for a wide spectrum of heavy negative ion species. The mechanical design features include provisions for fast interchange of sputter samples, ease of maintenance, direct cooling of the discharge chamber, and the use of easily replaced coaxial LaB{sub 6} cathodes. 13 refs., 3 figs., 1 tab.
Date: January 1, 1990
Creator: Alton, G.D.
Partner: UNT Libraries Government Documents Department

Existing muon beams at LAMPF

Description: This report discusses the production of muon beams at LAMPF. The backward decay beam, forward decay beam, surface beam, cloud muon beam, and pion beams are all briefly discussed. (LSP)
Date: December 31, 1991
Creator: Pillai, C.
Partner: UNT Libraries Government Documents Department

Production of positive ion beams from solids

Description: A technique for making metal ions for cyclotrons is described. Metal and non-metal ions from solids are produced in a Penning ion source by a process that involves ions that are unable to cross the first acceleration gap between the ion source and dee and are accelerated back into the ion source where they sputter charge material into the arc. This material is ionized and extracted from the ion source and accelerated. This technique was used for a large variety of ions, both metal and non-metal, including aluminum from the metal and boron from boron nitride charge materials. The efficiency for making iron ions with different ion support gases was calculated, and these results were experimentally checked. A dual ion source is being designed for a dc Penning ion source test stand which makes an excellent source for producing ions from solids for dc extracted Penning ion sources. (auth)
Date: January 1, 1975
Creator: Hudson, E.D.; Mallory, M.L. & Lord, R.S.
Partner: UNT Libraries Government Documents Department