Abstract
In this paper we report on simulations and the mechanical design of a high-compression electron gun for an Electron Beam Ion Source (EBIS) dedicated for production of high intensity and high repetition rate pulses of bare carbon ions for injection into linac-based hadron therapy facilities. The gun is presently under construction at CERN to be retrofitted into the TwinEBIS test bench for experimental studies. We describe the design constraints, show results of numeric simulations and report on the mechanical design featuring several novel ideas. The reported design makes use of combined-function units with reduced number of mechanical joints that were carefully controlled and tuned during the manufacturing phase. The simulations addressed a wide range of topics including the influence of thermal effects, focusing optics, symmetry-breaking misalignments and injection into a full 5T field.
Highlights
Introduction of carbonCarbon can be introduced into the Electron Beam Ion Source (EBIS) either as a singly charged ion beam from an external primary ion source, or as a neutral gas
In this paper we report on design and simulation results of a new electron beam optics, called MEDeGUN, to be retrofitted in the existing TwinEBIS at CERN
Inserted in an EBIS with a solenoidal field strength of at least 2 T it should fulfil carbon-ion production specifications given by 2nd generation IBT facilities, i.e. is 108 C6+ per pulse with a repetition rate of 400 Hz
Summary
In the last two decades radiotherapy with ion beams has made substantial progress and established itself as a superior method for treatment of a variety of cancer types. +linac booster combinations (cyclinac [8,9,10]) are technologically mature and offer attractive balance of treatment quality and costs The operation of both types is hindered by the lack of a suitable C6+ source providing pulses of the required structure: 300–400 Hz repetition rate, 108 C6+ within 1.5 μs (FWHM) pulse length [8] and specified beam purity. At the same time, achieving the specific design values for linac and cyclinac injection is not possible for modern EBISes [6] due to insufficient ion pulse intensity or pulse repetition rate Both parameters are defined by the electron beam optics of the EBIS. The electron gun is presently under construction and aims to bridge the gap between high intensity low repetition EBISes and low intensity high repetition Electron Beam Ion Traps, creating a C6+ source for linac-based LIT facilities [6]
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