Feasibility Experiments for the Induction Synchrotron Accelerator Concept

人们对低成本电子加速器的需求越来越大，这种加速器结构紧凑、效率高，能够在10-1000 MeV的能量范围内以高电流和高功率水平运行。我们建议对新的感应同步加速器(ISA)概念进行研究，以满足这一需求。ISA的运行方式是使电子束脉冲(30 ns长)通过由10 MHz脉冲发生器驱动的感应式加速单元进行再循环。闭合轨道传输磁铁的设计类似于传统同步加速器的设计，束流脉冲是使用Kicker磁铁注入和提取的。ISA可以在高达5千赫的频率下循环使用，以产生高平均光束功率。ISA概念的关键问题是在多次再循环中实现所需的脉冲重复率。我们建议开发一种基于高速功率MOSFET开关和磁脉冲压缩技术相结合的新的脉冲发生器概念。为了评估ISA概念的技术可行性，将在第一阶段执行以下研究任务：(1)证明使用功率MOSFET器件的串并联阵列形成的开关适合于ISA应用；(2)进行实验以表征和评估小规模ISA驱动器电路；以及(3)为第二阶段的原理验证ISA实验开发概念设计。如果成功，这项工作将验证ISA概念关键方面的技术可行性。

There is an increasing need for low cost electron accelerators which are compact, efficient and capable of operating at high current and power levels in the energy range of 10-1000 MeV. We propose to perform research on the new Induction Synchrotron Accelerator (ISA) concept with the objective of meeting this need. The ISA operates by recirculating an electron beam pulse ( 30 ns long) through induction- type acceleration cells which are driven by a pulse generator at 10 MHz. The closed-orbit, transport magnet design is similar to that for conventional synchrotrons, and beam pulses are injected and extracted using kicker magnets. An ISA can be recycled at up to 5 kHz to generate high average beam powers. The key issue for the ISA concept is achieving the required pulse repetition rate over many recirculations. We propose to develop a new pulse generator concept based on the use of high-speed, power-MOSFET switches combined with magnetic pulse compression techniques. The following research tasks will be performed in Phase I to assess the technical feasibility of the ISA concept: (1) demonstrate that switches formed using series- parallel arrays of power-MOSFET devices are suitable for ISA applications; (2) perform experiments to characterize and evaluate a small-scale ISA driver circuit and (3) develop a conceptual design for a Phase II proof-of-principle ISA experiment. If successful, this work will verify the technical feasibility of critical aspects of the ISA concept.