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This content will become publicly available on February 8, 2019

Title: A high-precision miniaturized rotating coil transducer for magnetic measurements

A miniaturized Printed Circuit Board (PCB) sensing coil, jointly developed by CERN and Fermilab for measuring the field of small-gap (less than 10 mm) accelerator magnets, is illustrated. A sensing coil array, with a scheme for compensating the main field when measuring the harmonic error components, hosted on a synthetic sapphire-based transducer, is presented. Key innovating features are (i) very-small size, both for the sensing coil array (thickness of 1.380 mm) and for the transducer (overall diameter of 7.350 mm), (ii) metrological performance, namely accuracy (more than five times better than state of the art), and 1-sigma repeatability (ten times better on harmonics with amplitude less than 100 ppm), and (iii) manufacturing technology of both the coil array (13 double layers aligned within 10 μm), and the sapphire support (concentricity, the most important uncertainty source for rotating coils, 3 μm of uncertainty, namely one order of magnitude better than fiberglass support). After stating the measurement problem, the design of the transducer and a case study of a two-layer PCB sensor array are also illustrated. Then, the prototyping and quality control of both the sensor and the transducer are discussed. Furthermore, the calibration and the results obtained with a prototype setupmore » at Fermilab are presented. Finally, in the appendix, the theory of the rotating coil, the sensor geometry, and the harmonic compensation are briefly reviewed for the reader easiness.« less
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4]
  1. Univ. of Naples Federico II (Italy). Dept. of Electrical Engineering and Information Technology; European Organization for Nuclear Research (CERN), Geneva (Switzerland). Technology Dept.
  2. European Organization for Nuclear Research (CERN), Geneva (Switzerland). Technology Dept.
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Technical Division
  4. European Organization for Nuclear Research (CERN), Geneva (Switzerland). Technology Dept.; Univ. of Sannio, Benevento (Italy)
Publication Date:
Report Number(s):
FERMILAB-PUB-18-209-TD
Journal ID: ISSN 0924-4247; 1673604
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Sensors and Actuators. A, Physical
Additional Journal Information:
Journal Volume: 274; Journal Issue: C; Journal ID: ISSN 0924-4247
Publisher:
Elsevier
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); European Union (EU); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 43 PARTICLE ACCELERATORS; 84.32.Hh/coils; induction; 85.75.Ss/sensors magnetic field; 06.20.fb/calibration; 07.55.Ge/measurement of magnetic field; 41.20.-q/magnetic field in electromagnetism
OSTI Identifier:
1438534