SummaryThe design and construction of two highly ionized hydrogenous plasma sources are described. Details are also given of the measurements that have been made to investigate the formation, density distribution, and decay of plasmas.
Aust. J. Phys., 1978, 31, 477-87 This paper reports on the use of observations of magnetoacoustic oscillations to determine the radial particle density and temperature profiles in a hydrogen plasma. The observations comprise measurements, at a number of frequencies, of the radial variations of the oscillation amplitude and of the total flux in the plasma. The analysis allows the determination of radial profiles of the ion and atom number densities.
OBSERVATIONSSince 2081 M I C has experienced electron cloud effects, which have Iimited the beam intensity. These include dynamic pressure rises -including pressure instabilities, tune shifts: electrons, a reduction of the stability threshold for bunches crossing the transition energy, and possibly slow emittance growth. We summarize the main observations in operation and dedicated experiments, as well as countermeasures including baking, NEG coated warm beam pipes, solenoids, bunch patterns, anti-grazing rings, pre-pumped cold beam pipes, and scrubbing. This article is a condensed version of Ref. El].Dynamic pressure rise from electron-impact desorption after an electron cloud has been formed was the first, and still is the most common electron cloud observation in RHIC [2,4,5]. It is also the operationally most relevant electron cloud effect in RHIC. This pressure rise is particularly pronounced at transition crossing when the ion bunches are short [6,73. In some cases the electron cloud switched off spontaneously, like in a second order phase transition [S], which can be explained if the both and electron and ion cloud is assumed 195.
The longitudinal requirements for the AGS to RHIC transfer process requires a precise control of the radius and frequency of the circulating bunches in the AGS just before the bunch extraction from the AGS and subsequent injection into RHIC via the ATR transfer line [1]. In addition the transverse beam parameters in the AGS at the location of the Extraction kicker define the "beammatching" between the ATR line and RHIC. In this paper we present theoretical and experimental results related to the longitudinal and transverse parameters of the AGS.
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