A low characteristic impedance quasi-rectangular pulser based on solid-state inductive adder for High rEpetition rate Muon Source at CSNS

Abstract

A solid-state inductive adder-based quasi-rectangular pulser featuring a low characteristic impedance has been developed in the laboratory to demonstrate the technical viability of using such a pulser for the HEMS muon source. The pulser consists of five layers connected in series, with each layer comprising 24 parallel branches. The paper mainly presents the design of the low characteristic impedance quasi-rectangular pulser from three aspects: primary driver circuit, coaxial central structure and transformer magnetic core. The experimental results show that through the careful design of the above three items, a quasi-rectangular pulse with fast rise and fall time can be achieved. The typical parameters of pulse voltage, pulse current, pulse flattop, repetitive rate, rise time and fall time at a charging voltage of 700 V are 3.5 kV, 560 A, 315 ns, 1 kHz, 47 ns, and 66 ns, respectively, on a 6.25 Ω matching resistor. In addition, the output characteristics of the pulser are investigated by varying critical parameters such as the charging voltages, the load resistances, and the number of parallel branches. The findings and results outlined in this paper offer valuable insights for the initial phase of developing an inductive adder pulser. They can aid in assessing the feasibility of the project, selecting critical parameters for essential components, and enhancing the output pulse's performance. A full-scale pulser with a peak pulse current of 3 kA and rise and fall time of ≤ 75 ns for HEMS muon source will be developed in the near future.