Laser wakefield acceleration is able to provide electron beams of GeV energy and continuously evolves toward higher energies. These beams have broad energy spectrum; hence, their measurements require diagnostics with wide energy acceptance. Here, we present a design of an electron spectrometer to characterize the beams in the energy range of 100 MeV–10 GeV, in a single shot. The design consists of 1-m long permanent dipole magnets and has a variable gap opening to accommodate different divergences and pointings of the electron beams. The design is backed by simulations, which are used to optimize the positions of imaging plates. The use of a collimator to improve the energy resolution in the case of large beam divergences and beam pointing is presented. We also present the Monte Carlo simulations to evaluate the signal to noise ratio, with and without a collimator.

中文翻译：

---

适用于大功率激光尾场加速实验的宽能范围（100 MeV–10 GeV）电子光谱仪

激光尾场加速能够提供GeV能量的电子束，并不断向更高能量发展。这些光束具有较宽的能谱。因此，它们的测量需要能量广泛接受的诊断。在这里，我们提出一种电子光谱仪的设计，以单次发射表征100 MeV–10 GeV能量范围内的电子束。该设计由1米长的永久偶极磁体组成，并具有可变的间隙开口，以适应电子束的不同发散和指向。该设计以仿真为后盾，用于优化成像板的位置。在大的光束发散和光束指向的情况下，提出了使用准直仪来改善能量分辨率。我们还提出了蒙特卡洛模拟来评估信噪比，