Physics considerations for laser-plasma linear colliders
Physics considerations for laser-plasma linear colliders
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DOI：
10.1103/physrevstab.13.101301
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发表时间：
2010-10-04
影响因子：
--
通讯作者：
Leemans, W. P.
中科院分区：
文献类型：
--
作者：
Schroeder, C. B.;Esarey, E.;Leemans, W. P.
讨论了基于激光等离子体加速器的下一代直线对撞机的物理问题。激光-等离子体加速器的低加速梯度和加速器级之间的短激光耦合距离允许紧凑的直线加速器。讨论了激光等离子体加速的两种方式。高度非线性的制度具有更高的加速场和均匀的聚焦力的优点，而准线性制度的优点是对称的加速性能的电子和正电子。推导出各种加速器和对撞机参数相对于等离子体密度和激光波长的标度。减少束辐射效应意味着使用中等电荷的超短束团。总直线加速器长度与等离子体密度的平方根成反比，而总功率与密度的平方根成正比。一个1 TeV的质心对撞机基于使用10（17）cm（-3）的等离子体密度的级，每级需要数十J的激光能量（使用1 μ m波长的激光器）和数十kHz的重复率。库仑散射和同步辐射的检查，并没有显着降低光束质量。还考虑了基于激光等离子体加速束的光子对撞机。对散射激光能量的要求与单个激光等离子体加速器级的要求相当。
Physics considerations for a next-generation linear collider based on laser-plasma accelerators are discussed. The ultrahigh accelerating gradient of a laser-plasma accelerator and short laser coupling distance between accelerator stages allows for a compact linac. Two regimes of laser-plasma acceleration are discussed. The highly nonlinear regime has the advantages of higher accelerating fields and uniform focusing forces, whereas the quasilinear regime has the advantage of symmetric accelerating properties for electrons and positrons. Scaling of various accelerator and collider parameters with respect to plasma density and laser wavelength are derived. Reduction of beamstrahlung effects implies the use of ultrashort bunches of moderate charge. The total linac length scales inversely with the square root of the plasma density, whereas the total power scales proportional to the square root of the density. A 1 TeV center-of-mass collider based on stages using a plasma density of 10(17) cm(-3) requires tens of J of laser energy per stage (using 1 mu m wavelength lasers) with tens of kHz repetition rate. Coulomb scattering and synchrotron radiation are examined and found not to significantly degrade beam quality. A photon collider based on laser-plasma accelerated beams is also considered. The requirements for the scattering laser energy are comparable to those of a single laser-plasma accelerator stage.