Speaker
Description
The Low Energy Beam Transport channel (LEBT) was designed for transfer a light ion beam generated by two ion sources (laser and ECR) to accelerator structure. The efficiency of the beam transportation sufficiently depends on the vacuum conditions in the channel sections. Various methods to calculate vacuum conditions inside chambers with a branched structure of a linear ion accelerator were considered. Calculation model was builded in the Molflow+ program basing on the vacuum structure of the LEBT. In addition to stationary gas flows coming from ion sources, pressure dynamics under pulsed gas load has been simulated. The process for a gas pulse passing was also calculated using the equivalent electrical circuit’s technique constructed by analogy with vacuum circuits. The calculation was done in the LTspice program, results obtained by two methods were compared. The assessment of the ability of the selected pumping equipment to provide the required vacuum will discussed in the report also.
