The Behavior of Carbon Resistor Thermometers in Magnetic Fields up to 100 kOe in the Pumped Liquid Helium and Hydrogen Temperature Ranges

1969 ◽  
Vol 40 (8) ◽  
pp. 1082-1085 ◽  
Author(s):  
B. C. Belanger
Keyword(s):  
Magnetic Fields ◽  
Liquid Helium ◽  
Temperature Ranges ◽  
Carbon Resistor

Imaging the Human Brain with Magnetoencephalography

2011 ◽  
pp. 881-889
Author(s):  
Dimitrios Pantazis
Keyword(s):  
Mathematical Modeling ◽  
Medical Imaging ◽  
Magnetic Fields ◽  
Human Brain ◽  
Electrical Activity ◽  
Liquid Helium ◽  
Communication Networks ◽  
Brain Function ◽  
Imaging Modality ◽  
Neuronal Disorders

Magnetoencephalography is a relatively new medical imaging modality for the monitoring and imaging of human brain function. Extracranial magnetic fields produced by the working human brain are measured by extremely sensitive superconducting sensors, called SQUIDs, enclosed in a liquid helium-filled dewar. Mathematical modeling allows the formation of images or maps of cortical neuronal currents that reveal neural electrical activity, identify cortical communication networks, and facilitate the treatment of neuronal disorders, such as epilepsy.

Imaging the Human Brain with Magnetoencephalography

2011 ◽  
pp. 294-302
Author(s):  
Dimitrios Pantazis ◽  
Richard M. Leahy
Keyword(s):  
Mathematical Modeling ◽  
Medical Imaging ◽  
Magnetic Fields ◽  
Human Brain ◽  
Electrical Activity ◽  
Liquid Helium ◽  
Communication Networks ◽  
Brain Function ◽  
Imaging Modality ◽  
Neuronal Disorders

Magnetoencephalography is a relatively new medical imaging modality for the monitoring and imaging of human brain function. Extracranial magnetic fields produced by the working human brain are measured by extremely sensitive superconducting sensors, called SQUIDs, enclosed in a liquid helium-filled dewar. Mathematical modeling allows the formation of images or  maps of cortical neuronal currents that reveal neural electrical activity, identify cortical communication networks, and facilitate the treatment of neuronal disorders, such as epilepsy.

Room Temperature Sample Scanning SQUID Microscope for Imaging the Magnetic Fields of Geological Specimens

2013 ◽  
Vol 475-476 ◽  
pp. 3-6 ◽  
Author(s):  
Qing Meng Wang ◽  
Hua Feng Qin ◽  
Qing Song Liu ◽  
Tao Song
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Magnetic Fields ◽  
Liquid Helium ◽  
Quantum Interference ◽  
Three Dimensional ◽  
Input Circuit ◽  
Pickup Coil ◽  
Weak Magnetic Fields ◽  
Scanning Squid

A microscope to image weak magnetic fields using a low-temperature superconducting quantum interference device (SQUID) had developed with a liquid helium consumption rate of ~0.5L/hour. The gradient pickup coil is made by a low-temperature superconducting niobium wire with a diameter of 66 μm, which is coupled to the input circuit of the SQUID and is then enwound on the sapphire bobbin. Both of the pickup coil and the SQUID sensor are installed in a red copper cold finger, which is thermally anchored to the liquid helium evaporation platform in the vacuum space of the cryostat. To reduce the distance between the pickup coil and sample, a 100 μm thick sapphire window is nestled up to the bottom of the cryostat. A three-dimensional scanning stage platform with a 50 cm Teflon sample rack under the sapphire window had the precision of 10 μm. To test the fidelity of the new facility, the distribution of the magnetic field of basalt slice specimens was determined. Results show that the spatial resolution of the newly-designed facility is 500 μm with a gradient magnetic field sensitivity of 380fT. This opens new opportunities in examining the distribution of magnetic assemblages in samples, which bear great geological and geophysical information.

scholarly journals Field Enhanced Intrinsic Fluctuations in Highly Oriented High Tc Thin Films

1989 ◽  
Vol 42 (4) ◽  
pp. 431 ◽  
Author(s):  
CB Smith ◽  
JM BelI ◽  
N Savvides ◽  
S Filipczuk ◽  
C Andrikidis
Keyword(s):  
Thin Films ◽  
Magnetic Fields ◽  
Detailed Analysis ◽  
Field Dependence ◽  
Flux Pinning ◽  
High Tc ◽  
Superconducting Material ◽  
Intrinsic Fluctuations ◽  
Temperature Ranges ◽  
The Ideal

Experimental resistance versus temperature plots measured in various magnetic fields up to 7 T in strength are presented for highly oriented YBaCu oxide thin films deposited onto crystalline zirconia. Possible broadening mechanisms are summarised and a detailed analysis made for three models which involve processes intrinsic to the ideal superconducting material. It is shown that two distinct potentials may be needed to understand flux pinning in different temperature ranges below Te. These two potentials have quite different temperature and field dependence.

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