Shen, J (reprint author), CHINESE ACAD SCI,INST HIGH ENERGY PHYS,POB 91838,BEIJING 100039,PEOPLES R CHINA.
Article; Proceedings Paper
The conception of cooling resistance R(c) and damping resistance R(c) are introduced. The explicit formulations of energy spread [Delta E(2)](rms) and emittance epsilon(0) of muon beam are deduced as a function of elementary excitation in absorbers. Both are the monotone increasing functions in the energy range of optimum cooling and damping (0.5-5 GeV) where pairs and plasmons are the dominate excitations in crystal. The excitation energy of plasmons is above pairs which distribute in 0--><(h)over bar omega(k,q)(max)>. Hence, plasmons are the main resistance of cooling and damping. Thus, decreasing the quantum energy of plasmon can decrease energy spread and emittance of muon beam. A conception of multi-layer crystal of 2D plasmon absorber is suggested to strengthing the effects of cooling and damping.