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21.
The effects of self fields on gain for a free‐electron lasers (FELs) with electromagnetic‐wave wiggler and an axial guide magnetic field is presented. The relativistic equation of motion for a single electron for all relevant fields, including wiggler, self‐fields and axial guide magnetic field has been solved. Two classes of possible single‐particle trajectories in this configuration are found. Result of the numerical calculation shown that the relativistic part of group I (group II) orbits decreases (increases) monotonically with the axial field. The gain equations for the FEL configuration by adding the effect of self‐fields have been derived. The numerical calculation has been employed to analysis the gain induced by the effects of the self‐fields. It is shown that, for group I orbits the gain decreases in the presence of self‐fields and the gain decrement increases with increasing axial guide magnetic field, while for group II orbits the self‐fields enhances the gain. The gain decrement and enhancement are due to diamagnetic and paramagnetic effects of the self‐magnetic field, respectively. The comparison of the gain for electromagnetic‐wave wiggler with the gain in helical wiggler has been done (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
22.
The International Linear Collider (ILC), which is based on
super-conducting RF acceleration technology, requires the damping
rings to provide beams with extremely small equilibrium emittance,
and large acceptance to ensure good injection efficiency for
high-emittance, and high-energy spread beam from the positron source.
In order to reduce the cost for ILC damping rings, an alternative
lattice which is different from the baseline configuration design has
been designed with modified FODO arc cells, and the total quadrupole
number has been reduced by half. At the same time, to decrease the
total cost involved in constructing access shafts needed to supply
power, cryogenics etc. for the wigglers and other systems, the number
of wiggler sections is decreased from 8 to 4, and further to 2. This
new lattice has been optimized to have a good dynamic aperture. This
alternative ILC damping ring lattice design will reduce the cost
largely as compared with the baseline design. 相似文献
23.
Amplification of an electromagnetic wave by a free electron laser (FEL) with a helical wiggler and an ion channel with a periodically varying ion density is examined. The relativistic equation of motion for a single electron in the combined wiggler and the periodic ion-channel fields is solved and the classes of possible trajectories in this configuration are discussed. The gain equation for the FEL in the low-gain-per-pass limit is obtained by adding the effect of the periodic ion channel. Numerical calculation is employed to analyse the gain induced by the effects of the non-uniform ion density. The variation of gain with ion-channel density is demonstrated. It is shown that there is a gain enhancement for group I orbits in the presence of a non-uniform ion-channel but not in a uniform one. It is also shown that periodic ion-channel guiding is used to reach the maximum peak gain in a low ion-channel frequency (low ion density). 相似文献
24.
采用三维自洽非线性理论计算方法,针对小周期波荡器自由电子激光器进行了数值模拟计算研究.结果表明,在我所现有脉冲线加速器基础上,采用周期为10mm的波荡器,可获得输出功率为20MW,波长为1.7mm的自由电子激光.最后给出实用化总体实验设计方案. 相似文献
25.
对线极化摇摆场中,在有引导磁场或四极磁场时的电子轨迹特性、束流包络特性进行了解析分析和数值分析,推得了线极化摇摆场中的梯度漂移解析表达式,借助于Bogoliubov的非线性渐近法和奇异摄动法得到的解析分析结果与数值分析结果很好地吻合。 相似文献
26.
电子束短脉冲效应产生的相干辐射 总被引:1,自引:1,他引:0
在模空间里给出了自由电子激光线性区非定态自治方程,得到了由于电子束短脉冲效应产生相干辐射的条件并解释了文献[1]的实验结果。 相似文献
27.
报道了作者近年来在美国斯坦福大学直接参与合作研制的100μm-1000μm可调谐远红外自由电子激光器概况,以及研制过程中所运用的独创的新技术。文中对它的主要部件扭轨磁全体的新型设计和磁场特性进行了深入的分析和研究。 相似文献
28.
双—双绕螺旋线极化摇摆器磁场 总被引:1,自引:1,他引:0
本文提出了一种用双-双绕螺旋线圈实现线极化摇摆器磁场的新途径,给出了磁场的理论分析结果。对双-双绕螺旋线圈的磁场进行的实验测量所得结果与理论分析结果基本相符合 相似文献
29.
采用渐变摇摆场技术进行了拉曼型自由电子激光实验,获得了最大辐射功率31MW、波长8~10.4mm的微波辐射输出,电子能量转换效率达9.68%。实验表明,对强流低能(0.45MeV)电子束拉曼自由电子激光器,渐变摇摆场比恒定摇摆场的自由电子激光器能量转换效率高2.6倍。 相似文献
30.
Dynamics of an electron beam in a helical coaxial wiggler is studied. It is observed that the electrons perform betatron oscillation in a potential well that reflects the effective radiation pressure of the wiggler field and a centrifugal force due to an average azimuthal drift. 相似文献