PAC07 - List of Authors (Chao, Y.-C.)

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Chao, Y.-C.

Paper	Title	Page
TUYAB02	Generation and Control of High Precision Beams at Lepton Accelerators	780
	Y.-C. Chao Jefferson Lab, Newport News, Virginia
	Parity violation experiments require precision manipulation of helicity-correlated beam coordinates on target at the nm/nrad-level. Achieving this unprecedented level of control requires a detailed understanding of the particle optics and careful tuning of the beam transport to keep anomalies from compromising the design adiabatic damping. Such efforts are often hindered by machine configuration and instrumentation limitations at the low energy end. A technique has been developed at CEBAF including high precision measurements, Mathematica-based analysis for obtaining corrective solutions, and control hardware/software developments for realizing such level of control at energies up to 5 GeV. Further, results on achieving rms energy stability at 10^-5, rms relative energy spread below 3x10^-5, and position control at micron level are presented. These results manifest the CW SRF electron linac stability capabilities and are valuable for a large range of applications, including ERLs and Electron-Ion Colliders for Nuclear and Particle Physics.
	Slides
TUPMN119	Energy Recovery Transport Design for Peking University FEL	1191
	G. M. Wang JLAB, Newport News, Virginia Y.-C. Chao Jefferson Lab, Newport News, Virginia J.-E. Chen, C. Liu, Z. C. Liu, X. Y. Lu, K. Zhao, J. Zhuang PKU/IHIP, Beijing
	Funding: supported by National 973 Projects and the U. S. Department of Energy Contract No. DE-AC05-06OR23177 A free-electron laser based on a superconducting linac is under construction in Peking University. To increase FEL output power, energy recovery is chosen as one of the most potential and popular ways. The design of a beam transport system for energy recovery is presented, which is suitable for the Peking University construction area. Especially, a chicane structure is chosen to change path length at ±20 degree and M56 in the arc is adjusted for fully bunch compression.
THPMN094	Simulations of Parametric-resonance Ionization Cooling	2927
	D. J. Newsham, R. P. Johnson, R. Sah Muons, Inc, Batavia S. A. Bogacz, Y.-C. Chao, Y. S. Derbenev Jefferson Lab, Newport News, Virginia
	Funding: Supported in part by DOE SBIR grant DE-FG02-04ER84016 Parametric-resonance ionization cooling (PIC) is a muon-cooling technique that is useful for low-emittance muon colliders. This method requires a well-tuned focusing channel that is free of chromatic and spherical aberrations. In order to be of practical use in a muon collider, it also necessary that the focusing channel be as short as possible to minimize muon loss due to decay. G4Beamline numerical simulations are presented of a compact PIC focusing channel in which spherical aberrations are minimized by using design symmetry.
THPAN052	Study of Generic Front-end Designs for ERL Based Light Sources	3345
	G. M. Wang, G. M. Wang JLAB, Newport News, Virginia Y.-C. Chao, P. Evtushenko, G. Neil Jefferson Lab, Newport News, Virginia J.-E. Chen, C. Liu, X. Y. Lu, K. Zhao PKU/IHIP, Beijing
	Funding: supported by National 973 Projects and the U. S. Department of Energy Contract No. DE-AC05-06OR23177 We present work directed at examining the performance of various front end components of an ERL based light source. These include electron source, bunch compression, merger, and accelerating sections, with parameter space dictated by proposed facilities (at FSU and Beijing University). These facilities share enough common structural features to make the study applicable to both to a large extent. In this report we will discuss the 6D phase space evolution through the front end based on simulation, with reliable modeling of magnetic and superconducting RF fields. Discussion will be devoted to relative merits of alternative designs, robustness and operational scenarios.