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Characterization of Magnetic Fields for the Los Alamos National Laboratory Neutron Electric Dipole Moment Experiment
Characterization of Magnetic Fields for the Los Alamos National Laboratory Neutron Electri...
Characterization of Magnetic Fields for the Los Alamos National Laboratory Neutron Electric Dipole Moment Experiment

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202103647
ISBN  
9798314875162
DDC  
539.7
저자명  
Hills, Felicity B.
서명/저자  
Characterization of Magnetic Fields for the Los Alamos National Laboratory Neutron Electric Dipole Moment Experiment
발행사항  
[Sl] : University of Michigan, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
160 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
주기사항  
Advisor: Chupp, Tim.
학위논문주기  
Thesis (Ph.D.)--University of Michigan, 2025.
초록/해제  
요약Experiments to measure the Neutron Electric Dipole Moment (nEDM) are low energy probes of CP-violating physics sensitive to Beyond the Standard Model (BSM) physics that is required to resolve the baryon asymmetry problem. The Los Alamos National Lab (LANL) nEDM experiment, a double cell Ultracold Neutron (UCN) experiment with a 199Hg comagnetometer, plans to measure the nEDM with a statistics-limited uncertainty of 2 x 10−27\uD835\uDC52·cm, a tenfold improvement of the world's best measurement to date. To achieve this uncertainty, the LANL nEDM requires a well-controlled and characterized magnetic environment to transport polarized UCNs from the polarizing magnet into the experimental volume and within the experimental volume. This dissertation reports four studies crucial to establishing the experiment: spin transport efficiency, the characterization of the LANL nEDM Magnetically Shielded Room (MSR), the characterization of prototype magnetometers to monitor the field in the experimental volume, and the development of a Radial Basis Function (RBF) interpolation strategy to estimate the magnetic field in the experimental volume from a set of magnetometer measurements. The spin transport efficiency from the polarizing magnet through the Spin Transport Coils (STCs) is estimated to be ∼ 0.868 in the current coil configuration. The characterization of the LANL nEDM MSR finds that the magnetic field difference between the two precession chambers changes by less than 5 fT in 180 s, greatly exceeding the LANL nEDM requirement that the magnetic field difference between the two precession chambers change by less than 136 fT in 180 s. This work also describes a magnetometer system that can determine changes as large as ∼ 1.5 pT to less than 100 fT, which meets the 136 fT stability requirement. These studies show that, assuming that the gradient from the applied magnetic field coil is sufficiently stable, the LANL nEDM experiment can expect to operate in the statistics-limited regime.
일반주제명  
Nuclear physics
일반주제명  
Physics
일반주제명  
Electromagnetics
일반주제명  
Materials science
키워드  
Magnetic field characterization
키워드  
Neutron Electric Dipole Moment
키워드  
Spin Transport Coils
키워드  
Magnetometer
키워드  
Radial Basis Function
기타저자  
University of Michigan Physics
기본자료저록  
Dissertations Abstracts International. 86-11B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■1001  ▼aHills,  Felicity  B.
■24510▼aCharacterization  of  Magnetic  Fields  for  the  Los  Alamos  National  Laboratory  Neutron  Electric  Dipole  Moment  Experiment
■260    ▼a[Sl]▼bUniversity  of  Michigan▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a160  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-11,  Section:  B.
■500    ▼aAdvisor:  Chupp,  Tim.
■5021  ▼aThesis  (Ph.D.)--University  of  Michigan,  2025.
■520    ▼aExperiments  to  measure  the  Neutron  Electric  Dipole  Moment  (nEDM)  are  low  energy  probes  of  CP-violating  physics  sensitive  to  Beyond  the  Standard  Model  (BSM)  physics  that  is  required  to  resolve  the  baryon  asymmetry  problem.  The  Los  Alamos  National  Lab  (LANL)  nEDM  experiment,  a  double  cell  Ultracold  Neutron  (UCN)  experiment  with  a  199Hg  comagnetometer,  plans  to  measure  the  nEDM  with  a  statistics-limited  uncertainty  of  2  x  10−27\uD835\uDC52·cm,  a  tenfold  improvement  of  the  world's  best  measurement  to  date.  To  achieve  this  uncertainty,  the  LANL  nEDM  requires  a  well-controlled  and  characterized  magnetic  environment  to  transport  polarized  UCNs  from  the  polarizing  magnet  into  the  experimental  volume  and  within  the  experimental  volume.  This  dissertation  reports  four  studies  crucial  to  establishing  the  experiment:  spin  transport  efficiency,  the  characterization  of  the  LANL  nEDM  Magnetically  Shielded  Room  (MSR),  the  characterization  of  prototype  magnetometers  to  monitor  the  field  in  the  experimental  volume,  and  the  development  of  a  Radial  Basis  Function  (RBF)  interpolation  strategy  to  estimate  the  magnetic  field  in  the  experimental  volume  from  a  set  of  magnetometer  measurements.  The  spin  transport  efficiency  from  the  polarizing  magnet  through  the  Spin  Transport  Coils  (STCs)  is  estimated  to  be  ∼  0.868  in  the  current  coil  configuration.  The  characterization  of  the  LANL  nEDM  MSR  finds  that  the  magnetic  field  difference  between  the  two  precession  chambers  changes  by  less  than  5  fT  in  180  s,  greatly  exceeding  the  LANL  nEDM  requirement  that  the  magnetic  field  difference  between  the  two  precession  chambers  change  by  less  than  136  fT  in  180  s.  This  work  also  describes  a  magnetometer  system  that  can  determine  changes  as  large  as  ∼  1.5  pT  to  less  than  100  fT,  which  meets  the  136  fT  stability  requirement.  These  studies  show  that,  assuming  that  the  gradient  from  the  applied  magnetic  field  coil  is  sufficiently  stable,  the  LANL  nEDM  experiment  can  expect  to  operate  in  the  statistics-limited  regime.
■590    ▼aSchool  code:  0127.
■650  4▼aNuclear  physics
■650  4▼aPhysics
■650  4▼aElectromagnetics
■650  4▼aMaterials  science
■653    ▼aMagnetic  field  characterization
■653    ▼aNeutron  Electric  Dipole  Moment
■653    ▼aSpin  Transport  Coils
■653    ▼aMagnetometer
■653    ▼aRadial  Basis  Function
■690    ▼a0605
■690    ▼a0756
■690    ▼a0607
■690    ▼a0794
■71020▼aUniversity  of  Michigan▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-11B.
■790    ▼a0127
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358118▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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