@article{oai:nagoya.repo.nii.ac.jp:00026308,
 author = {中村, 俊夫 and 南, 雅代 and 増田, 公明 and 小田, 寛貴 and 池田, 晃子 and 栗田, 直幸 and 山根, 雅子 and 西田, 真砂美 and 藤沢, 純平 and 方, 雨婷 and 徳丸, 誠 and 木田, 梨沙子 and 酢屋, 徳啓 and 北川, 浩之 and Nakamura, Toshio and Minami, Masayo and Masuda, Kimiaki and Oda, Hirotaka and Ikeda, Akiko and Kurita, Naoyuki and Yamane, Masako and Nishida, Masami and Fujisawa, Junpei and Fang, Yuting and Tokumaru, Makoto and Kida, Risako and Suya, Tokunori and Kitagawa, Hiroyuki},
 journal = {名古屋大学年代測定研究},
 month = {Mar},
 note = {An AMS system (Model 4130-AMS) dedicated to 14C measurements, built by High Voltage Engineering (HVE), B.V., the Netherlands, was delivered to Nagoya University in 1996/97. Acceptance tests of its performance on carbon-isotope-ratio measurements were completed in January of 1999, and routine measurements began in mid-2000. The number of targets measured was 330, 1430, 2077, 1003, 1,979, 1679, 1772, 1115, 1339, 866, 1300, 1701, 1449, 1634, 1351, 1741, 1156, 466 and 900 in each year from 1999 to 2017, respectively, and total number of targets measured by the end of December 2017 is 25,287. We briefly describe the maintenance processes of the AMS system in the year of 2017. The Tandetron AMS system at Nagoya University has encountered several problems in 2017. They are; (1) two big sparks seriously damaged the solid state RF driver for the high voltage generation, and the AMS system could not supply the high voltage of 2.5 MV used for 14C measurements. We replaced a damaged coil at the final part of the high-voltage power supply unit with a new coil; (2) a power supply unit for loading electrical current to correctly adjust the current for the recombinator magnet was in trouble. A resistance unit located at the end of current supply circuit was burnt out. We replaced it to a new one; (3) after a high-voltage spark, we could not apply high voltage to the accelerator. A control circuit board of supplying high voltage was checked and it was found out that the electrical board B-5-41-205-0001 was out of work. We replace the board to one repaired previously; (4) During the usual measurement of a graphite target, 12C3+, 13C3+ and 14C3+ decreased gradually in the last half of its measurement time of 30 minutes. The plus ion beam intensity of 13C3+ decreased from 200nA to 5nA in ten minutes, without any changes on its target current (corresponding to 13C- current). We first checked all the parameter values of the power supplies to the AMS system, but we could not find any changes from their nominal values. We finally concluded that something wrong has happened inside the accelerator tank, and decided to open the tank after 5 years of previously opening the tank. Owing to these problems, we can process only 900 graphite targets in 2017. In 2017, we also have carried out some application programs of 14C measurements at Nagoya University. Some of the results are included in this Proceedings volume.},
 pages = {79--87},
 title = {名古屋大学タンデトロンAMS14Cシステムの現状と利用(2017)},
 volume = {2},
 year = {2018}
}