Pepper-Pot Emittance Measurement at Laser Plasma Ion Source for I-4 Accelerator.

A computer code is developed for processing primary images obtained in the pepper-pot emittance measurement technique, which makes it possible to estimate emittance in a single measurement. The code uses a pepper-pot mask image on a scintillator screen obtained by means of laser plasma radiation. This image is used to find positions of holes of the mask and its rotation angle. The pepper-pot technique is applied to measure emittance of a carbon ion beam extracted from the laser-produced plasma, which is generated by CO2 laser pulses at the focal power density on the target of about 1011 W/cm2. Some results of image processing and calculation of the emittance are presented. [ABSTRACT FROM AUTHOR]