2017/11/01 by A.D. Stepanov, E.P. Gilson, Stepanov, Anton D. +16
Engineering · Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #FOS: Physical sciences #Magnetic confinement fusion research #Particle accelerators and beam dynamics #Plasma Diagnostics and Applications #Plasma Physics (physics.plasm-ph)
paper · pdf · doi:10.48550/arxiv.1711.00539
openalex publication_date 2017/11/01 · openalex created_date 2022/10/02 · openalex updated_date 2026/07/28
The Neutralized Drift Compression Experiment-II (NDCX-II) is an induction\nlinac that generates intense pulses of 1.2 MeV helium ions for heating matter\nto extreme conditions. Here, we present recent results on optimizing beam\ntransport. The NDCX-II beamline includes a 1-meter-long drift section\ndownstream of the last transport solenoid, which is filled with\ncharge-neutralizing plasma that enables rapid longitudinal compression of an\nintense ion beam against space-charge forces. The transport section on NDCX-II\nconsists of 28 solenoids. Finding optimal field settings for a group of\nsolenoids requires knowledge of the envelope parameters of the beam. Imaging\nthe beam on scintillator gives the radius of the beam, but the envelope angle\ndr/dz is not measured directly. We demonstrate how the parameters of the beam\nenvelope (r, dr/dz, and emittance) can be reconstructed from a series of images\ntaken at varying B-field strengths of a solenoid upstream of the scintillator.\nWe use this technique to evaluate emittance at several points in the NDCX-II\nbeamline and for optimizing the trajectory of the beam at the entry of the\nplasma-filled drift section.\n