Jing C, Kanareykin A, Power J G, Conde M, Yusof Z, Schoessow P, Gai W
Euclid Techlabs LLC, Solon, Ohio 44139, USA.
Phys Rev Lett. 2007 Apr 6;98(14):144801. doi: 10.1103/PhysRevLett.98.144801. Epub 2007 Apr 2.
One approach to future high energy particle accelerators is based on the wakefield principle: a leading high-charge drive bunch is used to excite fields in an accelerating structure or plasma that in turn accelerates a trailing low-charge witness bunch. The transformer ratio R is defined as the ratio of the maximum energy gain of the witness bunch to the maximum energy loss of the drive bunch. In general, R<2 for this configuration. A number of techniques have been proposed to overcome the transformer ratio limitation. We report here the first experimental study of the ramped bunch train (RBT) technique in a dielectric based accelerating structure. A single drive bunch was replaced by two bunches with charge ratio of 1:2.5 and a separation of 10.5 wavelengths of the fundamental mode. An average measured transformer ratio enhancement by a factor of 1.31 over the single drive bunch case was obtained.
一个领先的高电荷驱动束团用于激发加速结构或等离子体中的场，进而加速尾随的低电荷见证束团。变压器比R定义为见证束团的最大能量增益与驱动束团的最大能量损失之比。一般来说，这种配置下R<2。已经提出了许多技术来克服变压器比的限制。我们在此报告在基于电介质的加速结构中对斜坡束团序列（RBT）技术的首次实验研究。单个驱动束团被两个电荷比为1:2.5且间距为基模10.5个波长的束团所取代。与单个驱动束团的情况相比，测得的平均变压器比提高了1.31倍。
