一种快速数字积分器在粒子加速器现场磁测量中的性能。

Performance of a fast digital integrator in on-field magnetic measurements for particle accelerators.

作者信息

Arpaia P, Bottura L, Fiscarelli L, Walckiers L

机构信息

Engineering Department, University of Sannio, 82100 Benevento, Italy.

出版信息

Rev Sci Instrum. 2012 Feb;83(2):024702. doi: 10.1063/1.3673000.

DOI:10.1063/1.3673000

PMID:22380108

Abstract

The fast digital integrator has been conceived to face most demanding magnet test requirements with a resolution of 10 ppm, a signal-to-noise ratio of 105 dB at 20 kHz, a time resolution of 50 ns, an offset of 10 ppm, and on-line processing. In this paper, the on-field achievements of the fast digital integrator are assessed by a specific measurement campaign at the European Organization for Nuclear Research (CERN). At first, the architecture and the metrological specifications of the instrument are reported. Then, the recent on-field achievements of (i) ±10 ppm of uncertainty in the measurement of the main field for superconducting magnets characterization, (ii) ±0.02 % of field uncertainty in quality assessment of small-aperture permanent magnets, and (iii) ±0.15 % of drift, in an excitation current measurement of 600 s under cryogenic conditions, are presented and discussed.

摘要

快速数字积分器的设计旨在满足最苛刻的磁体测试要求，其分辨率为10 ppm，在20 kHz时信噪比为105 dB，时间分辨率为50 ns，偏移量为10 ppm，并具备在线处理能力。本文通过欧洲核子研究组织（CERN）的一项特定测量活动，评估了快速数字积分器在现场的性能。首先，报告了该仪器的架构和计量规格。然后，介绍并讨论了该积分器近期在现场取得的成果：（i）在表征超导磁体的主磁场测量中，不确定度为±10 ppm；（ii）在小口径永磁体的质量评估中，磁场不确定度为±0.02%；（iii）在低温条件下600 s的励磁电流测量中，漂移率为±0.15%。