The Cosmic Ray Energetics And Mass experiment for the International Space Station (ISS-CREAM) was installed on the ISS to measure high-energy cosmic-ray elemental spectra for the charge range $\mathrm{Z}=1$ to 26. The ISS-CREAM instrument includes a tungsten scintillating-fiber calorimeter preceded by a carbon target for energy measurements. The carbon target induces hadronic interactions, and showers of secondary particles develop in the calorimeter. The energy deposition in the calorimeter is proportional to the particle energy.

As a predecessor to ISS-CREAM, the balloon-borne CREAM instrument was successfully flown seven times over Antarctica for a cumulative exposure of 191 days. The CREAM calorimeter demonstrated its capability to measure energies of cosmic-ray particles, and the ISS-CREAM calorimeter is expected to have a similar performance. Before the launch, an engineering-unit calorimeter was shipped to CERN for calibration and performance tests. This beam test included position, energy, and angle scans of electron and pion beams together with a high-voltage scan for calibration and characterization. Additionally, an attenuation effect in the scintillating fibers was studied. In this paper, beam test results, including corrections for the attenuation effect, are presented.

在国际空间站上安装了国际空间站（ISS-CREAM）的宇宙线能量和质量实验，以测量电荷范围内的高能宇宙线元素光谱 $\mathrm{ž}=\mathrm{1个}$到26. ISS-CREAM仪器包括一个钨闪烁纤维量热仪，后面是一个用于测量能量的碳靶。碳靶引起强子相互作用，并且在量热仪中形成次级颗粒的喷淋。量热仪中的能量沉积与粒子能量成正比。

作为ISS-CREAM的前身，气球式CREAM仪器成功地在南极上空飞行了7次，累计飞行了191天。CREAM量热仪展示了其测量宇宙射线粒子能量的能力，并且ISS-CREAM量热仪有望具有类似的性能。发射前，工程单位量热计已运至CERN进行校准和性能测试。该电子束测试包括电子束和介子束的位置，能量和角度扫描，以及用于校准和表征的高压扫描。另外，研究了闪烁纤维的衰减作用。本文介绍了光束测试结果，包括对衰减效果的校正。