横向偏转RF腔在3 GeV台湾光子源设计的QBA晶格中的应用
Utilization of the Transverse Deflecting RF Cavities in the Designed QBA Lattice of the 3 GeV Taiwan Photon Source
摘要：
在3GeV TPS的QBA低发射度晶格中，研究了一对用于产生超短X射线脉冲的超导横向偏转RF腔。研究了TPS环超周期中两个腔体位置不同的三种构型。在电子跟踪的许多回合，腔之间的非线性效应，能量扩散，动量压缩因子，和同步辐射的影响被考虑在内。将RF偏转器定位在每个超周期中的QBA单元之间作为最佳布置的配置产生更好质量的电子聚束和辐射的光子脉冲。通过优化TPS光子束线的压缩光学元件，获得了约540 fs的辐射光子脉冲的半高宽和可接受的强度。此外，电子聚束长度的影响进行了研究，通过交替采用加速RF腔工作与1.1 MV和3.0 MV，分别。在3.0 MV的加速RF腔的操作提高了光子脉冲的强度高达30%，并降低了平衡垂直发射度下降到70 pm-rad。对偏转腔、QBA晶格和注入工艺的误差容限也作了评价。
英文摘要：
A pair of superconducting transverse deflecting RF cavities has been studied in the QBA low emittance lattices of the 3 GeV TPS for generating ultra short X-ray pulses. Three configurations with different locations for the two cavities in a super-period of the TPS ring are investigated. During numerous turns of the electron tracking, the nonlinear effects between the cavities, the energy spread, the momentum compaction factor, and the synchrotron radiation effects are taken into account. The configuration with positioning the RF deflectors between the QBA cells in each super-period as an optimum arrangement gives rise to better quality electron bunches and radiated photon pulses. The FWHM of the radiated photon pulses of about 540 fs with an acceptable intensity is attained by optimizing the compression optical elements of the TPS photon beam line. Furthermore, the effects of the electron bunch length are studied by alternatively employing an accelerating RF cavity operating with 1.1 MV and 3.0 MV, respectively. The operation of the accelerating RF cavity at 3.0 MV improved the intensity of the photon pulses up to 30% and reduced the equilibrium vertical emittance down to 70 pm-rad. The error tolerance for the deflecting cavities, QBA lattice and injection process are also evaluated.
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