Efficient solution for accelerating very high intensity beams in the low and medium energy regime

Chuan Zhang,Holger Podlech,Ulrich Ratzinger,Rudolf Tiede

doi:10.1103/physrevaccelbeams.22.100101

Abstract

Taking advantage of the 0{\deg} synchronous phase, the KONUS ("Combined 0{\deg} Structure" translated from German "Kombinierte Null Grad Struktur") beam dynamics strategy enables long accelerating sections with lens-free slim drift tubes in the low and medium energy regime. It has successfully realized worldwide many room temperature H-type linacs with compact layouts and good beam performance. In this paper, a further development of this solution i.e. to combine the KONUS dynamics with the young superconducting CH (Crossbar H-Type) structure for accelerating very high intensity beams is being presented. The efficiency of the new solution has been shown by the systematic design studies performed for a 150mA, 6MW deuteron linac.

Highlights

For the production of various useful high intensity secondary beams, e.g., neutrons, the development of megawatt-class linear accelerators has become very attractive in the past several decades
Many modern facilities based on this kind of high power driver linac (HPDL) have been realized, e.g., Japan Proton Accelerator Research Complex [3], or proposed, e.g., Multi-purpose Hybrid Research Reactor for High-tech Applications (MYRRHA) [4], worldwide, with the tendency to start the SC part already in the low and medium β region
In the past several decades, the combination of kombinierte null grad struktur (KONUS) dynamics strategy and NC H-type structures has been developed as an efficient solution for accelerating low and medium β beams

Summary

INTRODUCTION

For the production of various useful high intensity secondary beams, e.g., neutrons, the development of megawatt-class linear accelerators has become very attractive in the past several decades. Based on the classic negative-synchronous-phase beam dynamics strategy, two well-established solutions for the conventional low and medium energy linacs are as follows: (i) using long (multicell, hereafter referred to as >3 cells) NC structures, e.g., Alvarez-type DTL with integrated magnetic lenses inside drift tubes, and (ii) using short (typically 2–3 cells per cavity) SC structures, e.g., HWR or QWR with independent lenses outside of the cavities (see Fig. 2). For both of them, a relatively high number of magnets are required to provide sufficient transverse focusing.

KONUS AND SC CH DESIGN FOR A 6 MW DRIFT-TUBE LINAC

BEAM DYNAMICS SIMULATION RESULTS

ERROR STUDIES

Findings

CONCLUSIONS