Energy and rf cavity phase symmetry enforcement in multiturn energy recovery linac models
Energy and rf cavity phase symmetry enforcement in multiturn energy recovery linac models
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DOI：
10.1103/physrevaccelbeams.22.091602
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发表时间：
2019-04
影响因子：
1.7
通讯作者：
R. Koscica;N. Banerjee;G. Hoffstaetter;W. Lou;Gayathrini Premawardhana
中科院分区：
文献类型：
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作者：
R. Koscica;N. Banerjee;G. Hoffstaetter;W. Lou;Gayathrini Premawardhana
在多通道能量恢复直线加速器（ERL）中，每个空腔必须在光束减速期间恢复光束加速所消耗的所有能量，并且光束在返回直线加速器的每个回路中都应达到特定的能量目标。为了充分回收能量，并使每个返回的光束满足环路能量要求，除了选择适当的飞行时间外，还必须指定和保持腔场的相位和电压。这些参数是用全尺寸数值优化程序得到的。如果在加速和减速过程中施加时间和能量的对称性，则需要较少的参数，从而简化了优化。以康奈尔BNL ERL实验加速器（CBETA）为例，给出了满足环能量和零腔负荷优化目标的对称模型。相同的腔体设计和几乎均匀的直线布局使CBETA成为对称操作的潜在候选者。
In a multipass energy recovery linac (ERL), each cavity must regain all energy expended from beam acceleration during beam deceleration, and the beam should achieve specific energy targets during each loop that returns it to the linac. For full energy recovery, and for every returning beam to meet loop energy requirements, we must specify and maintain the phase and voltage of cavity fields in addition to selecting adequate flight times. These parameters are found with a full scale numerical optimization program. If we impose symmetry in time and energy during acceleration and deceleration, fewer parameters are needed, simplifying the optimization. As an example, we present symmetric models of the Cornell BNL ERL Test Accelerator (CBETA) with solutions that satisfy the optimization targets of loop energy and zero cavity loading. An identical cavity design and nearly uniform linac layout make CBETA a potential candidate for symmetric operation.