E. Barzi, B. Barish, W. Barletta, I. Ginzburg, S. Mitri
With the best of modern standard lasers, high-energy $gammagamma$ colliders from electron beams of E larger than 250 GeV are only possible at the expense of photon luminosity, i.e. 10 times lower than for photon colliders at c.m. energies below 0.5 TeV. For existing state-of-the art lasers, an optimistic upper energy limit for x=4.8 is an electron beam of less than 250 GeV. This Snowmass21 Contributed Paper shows how Free Electron Lasers (FEL) pave the way for High Energy&High Luminosity $gammagamma$ colliders. We present and assess a conceptual design study of a FEL with wavelength of 2.4 $mu$m and an x-factor in the range of 2 to 40, to maximize the luminosity of a $gammagamma$ collider as second interaction region of 0.5 TeV to 10 TeV c.m. $e^+e^-$ colliders.
使用最好的现代标准激光器，来自大于250 GeV的电子束的高能$gammagamma$对撞机只能以牺牲光子亮度为代价，即比cm能量低于0.5 TeV的光子对撞机低10倍。对于现有的最先进的激光器，x=4.8的乐观的能量上限是小于250 GeV的电子束。这篇Snowmass21贡献的论文展示了自由电子激光器(FEL)如何为高能高亮度$gammagamma$对撞机铺平道路。我们提出并评估了波长为2.4 $mu$ m, x因子在2到40范围内的自由电子激光器的概念设计研究，以最大限度地提高$gammagamma$对撞机作为0.5 TeV至10 TeV c.m.的第二相互作用区域的亮度$e^+e^-$对撞机。
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