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.
Simulation of high current electron and ion beam dynamics for EBIS
The results of the modeling of formation and transportation of ion and electron beams for EBTS BNL are presented. Simulations have been done with SAM, BEAM, and ExtraSAM codes. Some features of the codes are given as well. The codes provide high accuracy for simulating a wide range of tasks at EBTS, including electron gun, trap, collector, extraction, and transportation of the ion beam. Several examples of those computing can be found in the report. An effect of radial modulation of current density of electron beam in the magnetic field due to the sag between an edge and a center of the beam was noted.
Research on velocity distribution in semi-dry flue gas desulfurization tower
As an accurate high-quality instantaneous measurement technology, particle image velocimetry (PIV in acronym) has applied widely in single-phase flow and multiphase flow. The velocity distribution in semi-dry FGD tower directly influences gas-solid mix and contact situation. In base of the tower, gas-solid two-phase flow field is more complex, and has the quite tremendous influence to the overall system desulphurization efficiency. This paper utilized PIV to study velocity distribution in Semi-dry flue gas desulfurization tower and obtained velocity distribution.