Room-temperature calorimeter for x-ray free-electron lasers.
Room-temperature calorimeter for x-ray free-electron lasers.
复制标题
X 射线自由电子激光器的室温量热计。
DOI：
10.1063/1.4929666
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
T. Ishikawa
中科院分区：
文献类型：
--
作者：
T. Tanaka;M. Kato;N. Saito;K. Tono;M. Yabashi;T. Ishikawa
我们研制了一种用于测量x射线自由电子激光绝对辐射功率的室温量热计。这种室温热量计是一种基于电加热和辐射加热等效的电替代装置。因此，测量的辐射功率可追溯到电气标准，即，国际单位制（SI）。我们通过电功率测量（离线测试）展示了室温量热计的性能。在离线测试中，室温量热计被证明能够测量高达至少6.9 mW的外部功率，这超过了低温辐射计（日本的主要标准探测器）的上限（104 mW）。此外，室温量热计的测量不确定度小于1.0%，这是足够的X射线自由电子激光辐射功率的测量。与低温辐射计进行了间接比较，使用同步辐射源，以确认与室温量热计测量的绝对辐射功率的有效性。量热计测量的绝对辐射功率与低温辐射计测量的绝对辐射功率在0.6%以内一致，小于比较的相对标准不确定度（1.0%）。
We have developed a room-temperature calorimeter for absolute radiant power measurements of x-ray free-electron lasers. This room-temperature calorimeter is an electrical substitution device based on the equivalence of electrical and radiant heating. Consequently, the measured radiant powers are traceable to electrical standards, i.e., the International System Units (SI). We demonstrated the performance of the room-temperature calorimeter by electrical power measurements (offline tests). In the offline tests, the room-temperature calorimeter was proven to be able to measure external powers up to at least 6.9 mW, which exceeds the upper limit (∼4 mW) of a cryogenic radiometer (the primary standard detector in Japan). In addition, measurement uncertainties of the room-temperature calorimeter were evaluated to be less than 1.0%, which is adequate for the radiant power measurements of x-ray free-electron lasers. An indirect comparison with the cryogenic radiometer was performed using a synchrotron radiation source to confirm the validity of the absolute radiant powers measured with the room-temperature calorimeter. The absolute radiant powers measured by the calorimeter agreed with those measured by the cryogenic radiometer within 0.6%, which is less than the relative standard uncertainty of the comparison (1.0%).
影响因子：
35
作者：
Ishikawa, Tetsuya;Aoyagi, Hideki;Kumagai, Noritaka
通讯作者：
Kumagai, Noritaka