Study of Heavy-Ion Beam Cooling using the Electron Cooling Method

电子冷却是一个非常有吸引力的物理学领域，作为加速器技术。这个研究项目的主要目标是冷却过程本身的研究，并打算将质子冷却的技术扩展到更高的寿命。一个设备将冷却到200 MeV/u的能量提高到设计和构建的200 MeV/u。最大电子能为120 keV，而最大电子能等于200 MeV/U光束能。电子和电子元件之间的互动区域长度为1.5米。electron beam diameter为50 mm，maximum current density为0.5 A/ <cm^2>。一个皮尔斯电极、一个阳极和加速电极的电子光学考虑因素。一个扁平的Cathode沉浸在一个统一的Solenoid中。计算机模拟研究显示了大约0.1 eV的反向电子温度可以在小于1.2 kG的情况下被真实化。电子枪和收集器是精心设计的，以获取真空、高电压和高温度的帐户。第二部分的主要部分 ... More 电子指导三个螺线管和两个45 °-toroids的线圈组成。比磁场更好的同源性<+! 2 x <10^（-4）> was realized at the central solenoid。高电压系统是一个由120千伏高电压电源和一些其他电源组成的加速电子系统。由于这个HVPS的纵向温度的线性温度主要是由加速电压的变化决定的，因此需要一个良好的稳定性。良好的稳定性<+! 1 x <10^（-5）> was achieved at 120 kV. SUS316L stainless steel can attain the vacuum pr\of <10^（-11）> Torr.在室内，我们有漂移的管子、位置监测器和天线来拾取微波炉。电子轨道是研究使用一个小电子束。电子路径从枪开始，在收集器中结束，可以直观地观察到从荧光板发射的灯光。在冷却的Solenoid中，电子轨道的产生的部分比<+!> 2x <10^（-4）> ，其中与磁场测量结果一致。电子冷却过程是通过模拟研究的，它发现了冷却时间，即在第二顺序中可以实现。电子冷却器的微粒子内部目标已经开发出来。一个充电微粒子的流程是由一个简单的接触充电和加速精细金属粉末方法产生的。The obtained thickness between <10^（14）> and <10^（16）> atoms/ <cm^2> is just the desirable value for an internal target for a cooler ring。The construction of the ion beam storage ring to execute the beam cooling is now under construction。在第一束光束之后，我们打算开始电子冷却的研究，首先是质子，然后是重型的。目标加热和电子冷却之间的平衡也是我们未来中一个重要的主题。Less（低）

Electron cooling is very attractive subject of physics as well as accelerator technology. This research project aims primarily at the study of the cooling process itself and is intended to extend the technology of proton cooling to heavier ions.A device to cool light to heavy ions up to the energy of 200 MeV/u was designed and constructed. The maximum electron energy is 120 keV, which is equivalent to 200 MeV/u ion beam energy. The length of interaction region between electrons and ions is 1.5 m. The electron beam diameter is 50 mm and maximum current density is 0.5 A/ <cm^2> . Electron optics consists of a Pierce electrode, an anode and accelerating electrodes. A flat cathode is immersed in a uniform solenoid. Computer simulation studies show that transverse electron temperature of around 0.1 eV can be realized at the solenoid field less than 1.2 kG. Electron gun and collector were carefully designed taking account of the vacuum, high voltage and high temperature. The main parts of th … More e electron guiding coil consists of three solenoids and two 45゜-toroids. A good homogeneity of the magnetic field than <+!-> 2x <10^(-4)> was realized at the central solenoid. The high voltage system to accelerate electrons consists of 120 kV high voltage power supply and some other power supplies. A good stability is required for this HVPS since the longitudinal temperature of electron beam is mainly determined by the variation of the acceleration voltage. A good stability of <+!-> 1x <10^(-5)> was achieved at 120 kV. A vacuum chamber made of SUS316L stainless steel can attain the vacuum pressure of <10^(-11)> Torr. Inside the chamber we have drift tubes, position monitors and antenna to pick up microwave. Electron orbit was studied using a small electron beam. The electron path starting from the gun and ending in the collector was visually observed by viewing the light emitted from fluorescent plates. The fraction of deveation of electron trajectory at the cooling solenoid was less than <+!-> 2x <10^(-4)> , which is consistent with the result of the magnetic field measurements. Electron cooling process was studied by simulation and it was found that the cooling time of the order of second can be realized. A microparticle internal target for the electron cooler was developed. A flow of charged microparticles was produced by a simple method of contact-charging and accelerating fine metal powder. The obtained thickness between <10^(14)> and <10^(16)> atoms/ <cm^2> is just the desirable value for an internal target for a cooler ring.The construction of the ion beam storage ring to execute the beam cooling is now under construction. Im-mediately after the first beam, we intend to start the electron cooling studies, firstly for proton and then for heavy ions. The balance between target heating and electron cooling is also our important theme in future. Less