Tandem injected relativistic heavy ion facility at Brookhaven, present and future
Nuclear instruments and methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment/Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/1988
Journal Article
A magnetron ion source of Fermilab design has been adapted to provide an H- beam of 40 mA for acceleration in the Brookhaven 200 MeV Linac and injection into the AGS. The source operates at a ...repetition rate of 5 Hz and produces pulses of up to 250 μsec duration. Source stability, beam current and emittance have been studied as a function of several external source parameters. Beam emittance has been measured for two values of field gradient in the combined function magnet following the source. Evidence of neutralization of the space charge potential of the H- beam has been noted. In the focussing plane the emittance was smaller by a factor of 2 for the higher magnet gradient.
The AGS 200 MeV linac was converted to an H- accelerator during the summer of 1982 using a magnetron-type source in the column of the second pre-injector pit. Because of the re-entrant electrode ...design, a 20 keV transport line was required to carry the beam to the first electrode. Several changes were made to the source which enhanced its performance over previous designs. The same H- beam current is available at 2.75 times the duty factor with reduced deterioration of its output over several months of operation. The source, 750 keV transport, and linac modifications and performance will be presented.
Charge Exchange Injection at the AGS Barton, D. S.; Ahrens, L. A.; Gill, E. ...
IEEE transactions on nuclear science,
1983-Aug., Letnik:
30, Številka:
4
Journal Article
Recenzirano
Odprti dostop
The AGS has been brought into operation in October 1982 with multi-turn H- charge exchange injection. The injection area of the AGS has been modified to bring the H- beam from the 200 MeV linac ...through the main magnet fringe field to a stripping foil located within the magnet aperture. The injection system is described in detail and initial performance of the accelerator is reported.
We conducted two experiments to investigate how exercise endurance is modulated by the social environment of male lizards (Sceloporus undulatus) and whether this response is dependent on endogenous ...androgens. Male lizards were held in captivity for either 8 or 9-11 wk prior to measurements of running endurance. In both experiments, lizards were held either in complete isolation or in a single crowded group, and half of the isolated lizards in the 8-wk experiment were castrated to remove the predominant endogenous source of androgens. Endurance in the 9-11-wk experiment was threefold greater, and cardiac muscle mass was about 20% greater, in isolated than in crowded lizards. Testis, epididymis, and kidney morphology indicated that androgenic activity was higher in isolates. In the 8-wk experiment, running endurance was twofold greater in intact isolates than in either of the other two groups, whose values were indistinguishable. Plasma androgens were reduced in castrates compared with those in the other two groups. The intensity of communicative ventrolateral and gular pigmentation, which is known to be influenced by androgens, was significantly more vivid in intact isolates than in castrated or crowded lizards. Our results show that exercise endurance can change substantially within individuals over fairly short time periods. The expression of high endurance in isolates was associated with morphological evidence of higher androgenic activity than that in crowded males and required intact testes. Thus, the difference in endurance between crowded and isolated male lizards is associated with a probable difference in cardiac performance and seems likely to be mediated at least in part by androgenic steroids.
Search for Long-Lived Heavy Particles Cutts, D.; Dulude, R. S.; Hughlock, B. W. ...
Physical review letters,
01/1978, Letnik:
41, Številka:
6
Journal Article
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