Results of beam tests on a high current EBIS test stand
At Brookhaven National Laboratory there is an R&D program to design an Electron Beam Ion Source (EBIS) for use in a compact ion injector to be developed for the Relativistic Heavy Ion Collider (RHIC). The BNL effort is directed at developing an EBIS with intensities of 3/spl times/10/sup 9/ particles/pulse of ions such as Au/sup 35+/ and U/sup 45+/, and requires an electron beam on the order of 10 A. The construction of a test stand (EBTS) with the full electron beam power and 1/3 the length of the EBIS for RHIC is nearing completion. Initial commissioning of the EBTS was made with pulsed electron beams of duration <1 ms and current up to 13 A. Details of the EBTS construction, results of the pulse tests, and preparations for DC electron beam tests are presented.
Status of the Brookhaven National Laboratory high current electron beam ion source test stand
As part of a new, compact heavy ion injector for the AGS/RHIC complex at Brookhaven National Laboratory we are developing an electron beam ion source (EBIS) that would satisfy present and future requirements. Such a source should be capable of producing intensities of, e.g., Au35+ ions of about 3×109 particles/pulse or U45+ of about 2×109 particles/pulse. To achieve this, the required e-beam intensity is 10 A, at a pulse length of 100 ms. An EBIS test stand has been constructed, designed for the full electron beam power and having close to 1/2 of the trap length of an EBIS for RHIC. Initial electron beam tests have resulted in a 50 μs, 13 A electron beam. Ion production and extraction has been shown with a 3.1 A, 50 ms electron beam, achieving an ion yield of 19 nC/pulse (neutralization degree of 61%); fast extraction trials have yielded extracted ion pulses of 1 mA peak current and 18 μs at FWHM. Details of the test stand construction, results of the electron beam studies, and properties of the extracted...
A 100 MW electron source with extremely high beam area compression
Abstract The development at INP electron optical system for a 7 GHz magnicon incorporating the high voltage diode gun based on a 120 mm oxide cathode with microperveance of 0.83 and high electrostatic compression of a beam as well as the guiding magnetic system are described here. The main problems and the concepts used for the formation of the super dense relativistic beam in the diode gun and its matching with magnetic system are described in detail. The geometry of the whole electron optical system is given and the results of numerical calculations for the beam dynamics are described. The experimental results of the formation of electron beam and its transportation through the guiding magnetic system are described. As a result of these experiments a beam of 100 MW ( U = 436 kV, I = 236 A) in a pulse of 2 μs is obtained. The measured diameter of a beam in magnetic system is about 2.5 mm and it is close to that of the Brillouin's. Thus, the total measured compression of a beam over area exceeds 2000, power density in a beam achieves 2000 MW/cm 2 and an energy density in a beam exceeds 4 kJ/cm 2 .