|
|||||
|
|
Analyses on the operating point dependence of the energy resolution with a Ti/Au TES microcalorimeter |
|
| Authors: | U. Morita Y. Ishisaki T. Koga T. Ohashi S. F. Terracol T. Miyazaki S. Friedrich K. Mitsuda K. Tanaka |
| Affiliation: | a Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan b Lawrence Livermore National Laboratory (LLNL), L-270, Livermore, CA 94551, USA c Institute of Space and Astronautical Science (ISAS/JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan d SEIKO Instruments Inc., 563 Takatsuka-Shinden, Matsudo, Chiba 270-2222, Japan |
| Abstract: | We examined the performance of a single pixel Ti/Au transition-edge sensor (TES) calorimeter for incident X-ray energies of Al-K, Cr-K, and Fe-K, as a function of the TES resistance. We find that the energy resolution does not always degrade with increasing energy. The best energy resolution of 5.7±0.9 eV at 6.4 keV is obtained, which is possibly even better than the baseline width of 6.5±0.2 eV. Assuming that the noise level is determined by the noise spectrum NS(f;RR+dR(E)) considering the resistance change of dR(E), instead of NS(f;R) at the operating point, these results may be explained by the fact that the noise decreases at the higher TES resistance. The pulse variation appears to have a minimum at a certain resistance of R+dR(E)48 mΩ, and the best energy resolution for each line is obtained at such an operating point, respectively. The pulse variation could be enhanced when the fluctuation of the TES sensitivity is large at R+dR(E). |
| Keywords: | Author Keywords: X-ray detectors Microcalorimeter Superconducting transition edge sensor |
| 本文献已被 ScienceDirect 等数据库收录！ | |