A Design Report of the Baseline for PEP-X: an Ultra-Low Emittance Storage Ring

Bane, Karl ; Bertsche, Kirk ; Cai, Yunhai ; Chao, Alex ; Corbett, Willian ; Fox, John ; Hettel, Robert ; Huang, Xiaobiao ; Huang, Zhirong ; Ng, Cho-Kuen ; Nosochkov, Yuri ; Novokhatski, Sasha ; Radedeau, Thomas ; Raubenheimer, Tor ; Rivetta, Claudio ; Safranek, James ; S

关键词: BRIGHTNESS;    DAMPING;    DESIGN;    DIFFRACTION;    ELECTRON BEAMS;    LIFETIME;    PHOTON BEAMS;    RF SYSTEMS;    SAFETY REPORTS;    SCATTERING;    STORAGE RINGS;    WAVELENGTHS;    WIGGLER MAGNETS Accelerators;    ACCPHY;    SYNCHRAD;   

DOI  :  10.2172/981385
RP-ID  :  SLAC-PUB-13999
PID  :  OSTI ID: 981385
Others  :  TRN: US1003839

学科分类：核物理和高能物理

美国|英语

来源: SciTech Connect

【 摘 要 】

Over the past year, we have worked out a baseline design for PEP-X, as an ultra-low emittance storage ring that could reside in the existing 2.2-km PEPII tunnel. The design features a hybrid lattice with double bend achromat (DBA) cells in two arcs and theoretical minimum emittance (TME) cells in the remaining four arcs. Damping wigglers are used to reduce the horizontal emittance to 86 pm-rad at zero current for a 4.5 GeV electron beam. At a design current of 1.5 A, the horizontal emittance increases, due to intrabeam scattering, to 164 pm-rad when the vertical emittance is maintained at a diffraction limited 8 pm-rad. The baseline design will produce photon beams achieving a brightness of 10{sup 22} (ph/s/mm{sup 2}/mrad{sup 2}/0.1% BW) at 10 keV in a 3.5-m conventional planar undulator. Our study shows that an optimized lattice has adequate dynamic aperture, while accommodating a conventional off-axis injection system. In this report, we present the results of study, including the lattice properties, nonlinear dynamics, intra-beam scattering and Touschek lifetime, RF system, and collective instabilities. Finally, we discuss the possibility of partial lasing at soft X-ray wavelengths using a long undulator in a straight section.