The ion optical problems of injecting ions into a tandem are reviewed and it is shown that signigicant improvements in transmission efficiency are to be expected if the diameter of the terminal ...stripping canal is increased and if the electrostatic field at the entrance to the accelerator is terminated in a controlled manner. Results with an experimental tandem accelerator are reported.
An expanded plasma ion source is described which generates high current negative ion beams of hydrogen (~lmA) and helium (~3 μA). Also presented is preliminary data for a diode ion source where ...useful currents of many ion species, including O-, Al-, Cl-, Cu-, Bi-, (UFn)-, have been obtained. A description of a negative ion injector specifically designed for the injection of high currents into tandem accelerators is outlined.
Tandem Accelerators of the Future Burrill, E. Alfred
IEEE transactions on nuclear science,
06/1965, Letnik:
12, Številka:
3
Journal Article
Recenzirano
From the impetus of world-wide acceptance, the tandem-accelerator technology is continuing to advance rapidly. In a broadly based group of research and development programs at HVEC, the following ...areas are already producing important results for future tandem performance and design: a. intense beams of positive and negative ions, as well as neutral particles; b. powerful sources of high-voltage direct current; c. injection studies for light and heavy ions; d. efficient charge-changing techniques and systems; e. high transmission of ion beams through the tandem; f. improved voltage insulation invacuum and high-pressure gases. The common objectives of these programs is to upgrade progressively the performance and scope of existing tandem designs, with an ultimate aim of providing the research scientist with a complete freedom in his choice of nuclear collisions.
The Tandem Dynamitron Hanley, P. R.; Cleland, M. R.; Mason, C. F. ...
IEEE transactions on nuclear science,
01/1969, Letnik:
16, Številka:
3
Journal Article
Recenzirano
A two-stage tandem accelerator system, powered by a Dynamitron high voltage generator, is currently undergoing factory tests. The parallel-coupled, cascaded-rectifier generator has been designed for ...a 5 mA current capability at maximum guaranteed voltage for future high current operation. A large diameter gas stripping canal is used in two-stage operation to optimize beam transmission. Titanium getter-ion pumps are mounted in the terminal at the ends of the stripper assembly to insure acceptable vacuum conditions in the fully shielded acceleration tubes. Guaranteed specifications of this model series are 150 μA of targeted proton current at 10 MeV. The injector has delivered up to 250 μA of H - and the generator has operated at 5.7 MV during initial testing. The complete system is now being assembled for beam test. Some novel features of this new tandem are described and operational performance characteristics measured during factory testing are reported.
A system of personnel protection has been developed for the Brookhaven Tandem Accelerator Facility which imposes a minimum of inconvenience upon the experimentalist. The amount of required security ...(and attendant restriction on personnel) is kept commensurate with the potential radiation exposure and does not seriously interfere with nonhazardous modes of operation. Radiation areas are divided into zones which permit selective access into low-risk areas. Personnel are excluded from radiation areas on a zone-by-zone basis as the radiation intensity rises. A perimeter consisting of zones and additional barriers surrounding the entire radiation area provides secondary protection against unauthorized access regardless of radiation levels. Violation of the perimeter causes the ion beam to be intercepted before it enters the accelerator. Violation of a high-radiation zone causes shutdown of the accelerator.
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