Calibration of the integrating sphere for O4 in KAGRA gravitational wave telescope

Fujii, S.; Abe, H.; Akutsu, T.; Ando, M.; Aoumi, M.; Araya, A.; Aritomi, N.; Aso, Y.; Bae, S.; Bajpai, R.; Cannon, K.; Cao, Z.; Chang, R. -J.; Chen, A. H. -Y.; Chen, D.; Chen, H.; Chen, Y.; Chiba, A.; Chiba, R.; Chou, C.; Eisenmann, M.; Fujii, S.; Fukunaga, I.; Haba, D.; Haino, S.; Han, W. -B.; Hayakawa, H.; Hayama, K.; Himemoto, Y.; Hirata, N.; Hirose, C.; Hoshino, S.; Hsieh, H. -F.; Hsiung, C.; Hsu, S. -C.; Hui, D. C. Y.; Inayoshi, K.; Itoh, Y.; Iwaya, M.; Jin, H. B.; Jung, K.; Kajita, T.; Kamiizumi, M.; Kanda, N.; Kato, J.; Kato, T.; Kim, S.; Kimura, N.; Kiyota, T.; Kohri, K.; Kokeyama, K.; Komori, K.; Kong, A. K. H.; Koyama, N.; Kume, J.; Kuroyanagi, S.; Kuwahara, S.; Kwak, K.; Lai, S.; Lee, H. W.; Lee, R.; Lee, S.; Leonardi, M.; K. L., Li; Lin, L. C. -C.; Lin, C. -Y.; Lin, E. T.; Liu, G. C.; L. -T., Ma; Maeda, K.; Matsuyama, M.; Meyer-Conde, M.; Michimura, Y.; Mio, N.; Miyakawa, O.; Miyamoto, S.; Miyoki, S.; Morisaki, S.; Moriwaki, Y.; Murakoshi, M.; Nakamura, K.; Nakano, H.; Narikawa, T.; Nguyen Quynh, L.; Nishino, Y.; Nishizawa, A.; Obayashi, K.; J. J., Oh; Oh, K.; Ohashi, M.; Ohkawa, M.; Oohara, K.; Oshima, Y.; Oshino, S.; Page, M. A.; Pan, K. -C.; Park, J.; Pena Arellano, F. E.; Saha, S.; Sakai, K.; Sako, T.; Sato, R.; Sato, S.; Sato, Y.; Sawada, T.; Sekiguchi, Y.; Shao, L.; Shikano, Y.; Shimode, K.; Shinkai, H.; Shiota, J.; Somiya, K.; Suzuki, T.; Suzuki, T.; Tagoshi, H.; Takahashi, H.; Takahashi, R.; Takamori, A.; Takatani, K.; Takeda, H.; Takeda, M.; Tamaki, M.; Tanaka, K.; Tanaka, S. J.; Tanaka, T.; Taruya, A.; Tomaru, T.; Tomita, K.; Tomura, T.; Toriyama, A.; Trani, A. A.; Tsuchida, S.; Uchikata, N.; Uchiyama, T.; Uehara, T.; Ueno, K.; Ushiba, T.; Van Putten, M. H. P. M.; Wang, H.; Washimi, T.; Wu, C.; Wu, H.; Yamamoto, K.; Yamamoto, M.; Yamamoto, T.; Yamamoto, T. S.; Yamamura, S.; Yamazaki, R.; Yang, L. -C.; Yang, Y.; Yeh, S. -W.; Yokoyama, J.; Yokozawa, T.; Yuzurihara, H.; Zhao, Y.; Zhu, Z. -H.

KAGRA, the gravitational wave telescope located in Japan, has started the 4th international observing run called O4 with LIGO and Virgo. The accuracy of parameter estimation for gravitational wave source objects depends on the accuracy of calibration. LIGO, Virgo, and KAGRA use the same calibration method called the photon calibrator (Pcal) method. In the Pcal system, we will obtain the precise displacement of a mirror induced by a well-calibrated radiation pressure of a laser beam which is injected into the mirror. As the uncertainty of the Pcal system is primarily limited by the uncertainty of the laser power measurement, we use integrating sphere (IS) power meters, which are considered to have good accuracy and precision, for the laser power measurement. However, during our calibration measurements in O3GK, we found that there were unidentified systematic errors in the laser power measurement. Therefore, we investigated the incident direction dependence and polarization dependence of the IS power meter. According to our study, the angular dependence differs between two types of ISs, namely GPS (General Purpose Spheres) and LPM (Laser Power Measurement Spheres), which are utilized in our calibration system. The angular dependence of the GPS type was greater than that of the LPM type. The GPS measurement showed an approximate 8.4% increase from the value obtained with perpendicular incidence at maximum. In contrast, the LPM measurement showed a 0.2% increase from the value obtained with perpendicular incidence at maximum. As to polarization dependence, the effect of that on the LPM type was within the range of -0.06% to 0.06%. From this study, we found a possibility that the angle dependence was able to explain the uncertainty observed in O3GK. In this proceeding, we report the angular and polarization dependence of ISs and consider the effect on the uncertainty of the KAGRA Pcal system.

Calibration of the integrating sphere for O4 in KAGRA gravitational wave telescope / Fujii, S.; Abe, H.; Akutsu, T.; Ando, M.; Aoumi, M.; Araya, A.; Aritomi, N.; Aso, Y.; Bae, S.; Bajpai, R.; Cannon, K.; Cao, Z.; Chang, R. -J.; Chen, A. H. -Y.; Chen, D.; Chen, H.; Chen, Y.; Chiba, A.; Chiba, R.; Chou, C.; Eisenmann, M.; Fujii, S.; Fukunaga, I.; Haba, D.; Haino, S.; Han, W. -B.; Hayakawa, H.; Hayama, K.; Himemoto, Y.; Hirata, N.; Hirose, C.; Hoshino, S.; Hsieh, H. -F.; Hsiung, C.; Hsu, S. -C.; Hui, D. C. Y.; Inayoshi, K.; Itoh, Y.; Iwaya, M.; Jin, H. B.; Jung, K.; Kajita, T.; Kamiizumi, M.; Kanda, N.; Kato, J.; Kato, T.; Kim, S.; Kimura, N.; Kiyota, T.; Kohri, K.; Kokeyama, K.; Komori, K.; Kong, A. K. H.; Koyama, N.; Kume, J.; Kuroyanagi, S.; Kuwahara, S.; Kwak, K.; Lai, S.; Lee, H. W.; Lee, R.; Lee, S.; Leonardi, M.; Li, K. L.; Lin, L. C. -C.; Lin, C. -Y.; Lin, E. T.; Liu, G. C.; Ma, L. -T.; Maeda, K.; Matsuyama, M.; Meyer-Conde, M.; Michimura, Y.; Mio, N.; Miyakawa, O.; Miyamoto, S.; Miyoki, S.; Morisaki, S.; Moriwaki, Y.; Murakoshi, M.; Nakamura, K.; Nakano, H.; Narikawa, T.; Nguyen Quynh, L.; Nishino, Y.; Nishizawa, A.; Obayashi, K.; Oh, J. J.; Oh, K.; Ohashi, M.; Ohkawa, M.; Oohara, K.; Oshima, Y.; Oshino, S.; Page, M. A.; Pan, K. -C.; Park, J.; Pena Arellano, F. E.; Saha, S.; Sakai, K.; Sako, T.; Sato, R.; Sato, S.; Sato, Y.; Sawada, T.; Sekiguchi, Y.; Shao, L.; Shikano, Y.; Shimode, K.; Shinkai, H.; Shiota, J.; Somiya, K.; Suzuki, T.; Suzuki, T.; Tagoshi, H.; Takahashi, H.; Takahashi, R.; Takamori, A.; Takatani, K.; Takeda, H.; Takeda, M.; Tamaki, M.; Tanaka, K.; Tanaka, S. J.; Tanaka, T.; Taruya, A.; Tomaru, T.; Tomita, K.; Tomura, T.; Toriyama, A.; Trani, A. A.; Tsuchida, S.; Uchikata, N.; Uchiyama, T.; Uehara, T.; Ueno, K.; Ushiba, T.; van Putten, M. H. P. M.; Wang, H.; Washimi, T.; Wu, C.; Wu, H.; Yamamoto, K.; Yamamoto, M.; Yamamoto, T.; Yamamoto, T. S.; Yamamura, S.; Yamazaki, R.; Yang, L. -C.; Yang, Y.; Yeh, S. -W.; Yokoyama, J.; Yokozawa, T.; Yuzurihara, H.; Zhao, Y.; Zhu, Z. -H.. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - 444:(2024).