Electron cloud observations and cures in the Relativistic Heavy Ion Collider
Electron cloud observations and cures in the Relativistic Heavy Ion Collider
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DOI：
10.1103/physrevstab.11.041002
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发表时间：
2008-04
影响因子：
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通讯作者：
W. Fischer;M. Blaskiewicz;J. Brennan;H. Huang;H. Hseuh;V. Ptitsyn;T. Roser;P. Thieberger;D. Trbojevic;J. Wei;S. Zhang;U. Iriso
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文献类型：
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作者：
W. Fischer;M. Blaskiewicz;J. Brennan;H. Huang;H. Hseuh;V. Ptitsyn;T. Roser;P. Thieberger;D. Trbojevic;J. Wei;S. Zhang;U. Iriso
自2001年以来，相对论重离子对撞机经历了电子云效应，其中一些效应限制了束流强度。这些包括动态压力上升（包括压力不稳定性）、调谐偏移、穿过跃迁能量的束团不稳定阈值的降低以及可能的不相干发射度增长。我们总结了运行中的主要观察结果和专门的实验以及对策，包括烘烤、非蒸发吸气剂涂层暖束管、螺线管、束流模式、防擦环、预抽冷束管、擦洗和长束流操作。
Since 2001, the Relativistic Heavy Ion Collider has experienced electron cloud effects, some of which have limited the beam intensity. These include dynamic pressure rises (including pressure instabilities), tune shifts, a reduction of the instabil ity threshold for bunches crossing the transition energy, and possibly incoherent emittance growth. We summarize the main observations in operation and dedicated experiments as well as countermeasures including baking, nonevaporable getter coated warm bea m pipes, solenoids, bunch patterns, antigrazing rings, prepumped cold beam pipes, scrubbing, and operation with long bunches.