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Title: High precision magnetic field measurement and mapping of the LEReC 180 degree bending magnet using very low field NMR with hall combined probe (140 - 350 gauss)

Abstract

The Relativistic Heavy Ion Collider (RHIC) at BNL are using the Low Energy RHIC Electron Cooling (LEReC) to conduct experiments that search for the quantum chromodynamic (QCD) critical point. The first ever electron cooling based on the RF acceleration of electron beams was experimentally demonstrated on April 5, 2019 at LEReC at BNL. The first critical step in obtaining successful 3D non-magnetized cooling of the Au ion bunches in the RHIC cooling section was matching the electron beam energy with a relative error less than 5*10-4 to the ion beam energy. Part of the LEReC beamline is a dipole magnet that bends the electron beam 180 degree. One of the most outstanding measurement challenges is that the dipole field is so low (≈200 G). Most of the existing NMR probes can only measure fields >400 G. Lower signal-to-noise ratio at low fields is requires the use of larger sample volumes. Working with CAYLAR, a NMR probe has been redesigned and optimized for these low field measurements with high resolution. We report the methods, challenges, and results for extensive magnetic field mappings of the 180 dipole magnet. A combination of NMR and Hall sensors has been successfully implemented to measure uniformmore » field regimes inside the magnet center area and non-uniform field regimes at the magnet ends. Detailed measurement and mapping have been performed at five radii and five heights along the beam trajectory. Meanwhile a finite element magnetic modeling simulation of the magnet using Opera software has been performed. The calculated and measured data are compared, and the calculated data is good reference for measured data over long length mapping from magnet edge to center. The measured magnetic measurement data is directly useful for beam instrumentation, diagnostics and operation.« less

Authors:
ORCiD logo [1];  [2];  [3];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); Wheaton College, Wheaton, IL (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States); Indiana Univ., Bloomington, IN (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1602462
Report Number(s):
BNL-213659-2020-JAAM
Journal ID: ISSN 0957-0233; TRN: US2104011
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Measurement Science and Technology
Additional Journal Information:
Journal Volume: 31; Journal Issue: 7; Journal ID: ISSN 0957-0233
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Bending Magnet; Low Energy RHIC Electron Cooling (LEReC); NMR Probe; Hall Probe; Magnetic Field Measurement; RHIC

Citation Formats

Song, Honghai, Cruz, Nathan, Britt, Tristan, Bruno, Donald, Capobianco-Hogan, Kyle, Degen, Christopher, Fedotov, A. V., Gassner, David, Joshi, Piyush, Kewisch, Jorg, Mi, Chaofeng, Miller, Toby, Seletskiy, Sergei, Thieberger, Peter, Tuozzolo, Joseph, and Wanderer, Peter. High precision magnetic field measurement and mapping of the LEReC 180 degree bending magnet using very low field NMR with hall combined probe (140 - 350 gauss). United States: N. p., 2020. Web. https://doi.org/10.1088/1361-6501/ab7ac1.
Song, Honghai, Cruz, Nathan, Britt, Tristan, Bruno, Donald, Capobianco-Hogan, Kyle, Degen, Christopher, Fedotov, A. V., Gassner, David, Joshi, Piyush, Kewisch, Jorg, Mi, Chaofeng, Miller, Toby, Seletskiy, Sergei, Thieberger, Peter, Tuozzolo, Joseph, & Wanderer, Peter. High precision magnetic field measurement and mapping of the LEReC 180 degree bending magnet using very low field NMR with hall combined probe (140 - 350 gauss). United States. https://doi.org/10.1088/1361-6501/ab7ac1
Song, Honghai, Cruz, Nathan, Britt, Tristan, Bruno, Donald, Capobianco-Hogan, Kyle, Degen, Christopher, Fedotov, A. V., Gassner, David, Joshi, Piyush, Kewisch, Jorg, Mi, Chaofeng, Miller, Toby, Seletskiy, Sergei, Thieberger, Peter, Tuozzolo, Joseph, and Wanderer, Peter. Mon . "High precision magnetic field measurement and mapping of the LEReC 180 degree bending magnet using very low field NMR with hall combined probe (140 - 350 gauss)". United States. https://doi.org/10.1088/1361-6501/ab7ac1. https://www.osti.gov/servlets/purl/1602462.
@article{osti_1602462,
title = {High precision magnetic field measurement and mapping of the LEReC 180 degree bending magnet using very low field NMR with hall combined probe (140 - 350 gauss)},
author = {Song, Honghai and Cruz, Nathan and Britt, Tristan and Bruno, Donald and Capobianco-Hogan, Kyle and Degen, Christopher and Fedotov, A. V. and Gassner, David and Joshi, Piyush and Kewisch, Jorg and Mi, Chaofeng and Miller, Toby and Seletskiy, Sergei and Thieberger, Peter and Tuozzolo, Joseph and Wanderer, Peter},
abstractNote = {The Relativistic Heavy Ion Collider (RHIC) at BNL are using the Low Energy RHIC Electron Cooling (LEReC) to conduct experiments that search for the quantum chromodynamic (QCD) critical point. The first ever electron cooling based on the RF acceleration of electron beams was experimentally demonstrated on April 5, 2019 at LEReC at BNL. The first critical step in obtaining successful 3D non-magnetized cooling of the Au ion bunches in the RHIC cooling section was matching the electron beam energy with a relative error less than 5*10-4 to the ion beam energy. Part of the LEReC beamline is a dipole magnet that bends the electron beam 180 degree. One of the most outstanding measurement challenges is that the dipole field is so low (≈200 G). Most of the existing NMR probes can only measure fields >400 G. Lower signal-to-noise ratio at low fields is requires the use of larger sample volumes. Working with CAYLAR, a NMR probe has been redesigned and optimized for these low field measurements with high resolution. We report the methods, challenges, and results for extensive magnetic field mappings of the 180 dipole magnet. A combination of NMR and Hall sensors has been successfully implemented to measure uniform field regimes inside the magnet center area and non-uniform field regimes at the magnet ends. Detailed measurement and mapping have been performed at five radii and five heights along the beam trajectory. Meanwhile a finite element magnetic modeling simulation of the magnet using Opera software has been performed. The calculated and measured data are compared, and the calculated data is good reference for measured data over long length mapping from magnet edge to center. The measured magnetic measurement data is directly useful for beam instrumentation, diagnostics and operation.},
doi = {10.1088/1361-6501/ab7ac1},
journal = {Measurement Science and Technology},
number = 7,
volume = 31,
place = {United States},
year = {2020},
month = {4}
}

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