Minimum ellipse emittance analysis with SCUBEEx code

Abstract

Results of the first beam emittance measurements obtained at the SARAF 20 keV/u protons and deuterons low energy beam transport line were analyzed using the SCUBEEx code from SNS. In most of the measurements the code provides with robust emittance evaluation. However significant problems were encountered in the special cases of low currents beams. We found that use of the minimum ellipse rather than RMS ellipse as a SCUBEEx filter ellipse resulted in significant improvement in these cases.

Ion beam intensity and phase space measurement techniques for ion sources

“…In most cases, an important part of the phase space measurement is the data analysis and the removal of unidealities such as background noise, ghost images, and amplifier bias. Several studies on this subject have been made with different recommendations for data processing, [51][52][53] and even if the details vary, the basic recipe is the same. In here, an example of such a process is described for a 2D phase space measurement using an artificially generated dataset of 100 × 100 pixels with a bi-Gaussian phase space distribution with emittance εrms = 100 mm mrad, Gaussian noise with an rms amplitude of 1% of the peak beam signal, and a bias of 0.5%.…”

H– beam transport experiments in a solenoid low energy beam transport

“…But SCUBeX has shown some difficulties to converge if the beam has large filamentations. 8 Therefore, to check SCUBeX a threshold (typically ≤1 %) was applied to some results but the difference was never bigger than ≤2.5 %, all rms emittances shown in the text base on SCUBeX.…”