scholarly journals Neutron interferometry, fifth force and axion like particles

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
A. Capolupo ◽  
S. M. Giampaolo ◽  
A. Quaranta
Keyword(s):  
Magnetic Fields ◽  
Neutron Beam ◽  
Phase Difference ◽  
Neutron Interferometry ◽  
Fifth Force ◽  
Neutron Beams ◽  
Detection Strategy ◽  
Interferometric Measurement ◽  
The Future

AbstractWe propose a new possible detection strategy to reveal the fermion–fermion interaction mediated by axions and axion-like particles, based on interferometric measurement of neutron beams. We consider an interferometer in which the neutron beam is split in two sub-beams propagating in regions with differently oriented magnetic fields. The beam paths and the strength of the magnetic fields are set in such a way that the phase difference depends only on the axion-induced interaction. The resulting phase difference is directly related to the presence of axions. Our results show that such a phase might represent, in the future, a tool to probe the existence of axions and axion-like particles or a fifth force with interferometry.

scholarly journals Neutron imager with micro channel plates (MCP) in electrostatic mirror configuration: Experimental test with radiation source

2018 ◽  
Vol 48 ◽  
pp. 1860120
Author(s):  
V. Variale ◽  
B. Skarbo
Keyword(s):  
Neutron Beam ◽  
Ccd Camera ◽  
Experimental Tests ◽  
Micro Channel ◽  
Spatial Profile ◽  
Critical Feature ◽  
Neutron Beams ◽  
Channel Plate ◽  
A Charge ◽  
Electrostatic Mirror

The design of a new high-transparency device based on a Micro Channel Plate (MCP) detector was recently proposed for monitoring the flux and beam spatial profile of neutron beams. The proposed device consists of a very thin aluminum (Al) foil (with a [Formula: see text]Li deposit) placed in the neutron beam and an MCP detector equipped with a phosphor-screen readout linked to a charge-coupled device (CCD) camera outside the neutron beam. A critical feature of this device is that it uses an electrostatic mirror to minimize the perturbation of the neutron beam (i.e., absorption and scattering). It can be used at existing neutron time-of-flight (n_TOF) facilities (in particular at the n_TOF facility at CERN) for monitoring the flux and spatial profile of neutron beams in the thermal and epithermal region. The experimental tests conducted for this study using a radioactive source to determine the behavior of the electrostatic mirror behavior will be presented and discussed in this paper.

Measuring cosmic magnetic fields with very large telescopes

2008 ◽  
Vol 4 (S259) ◽  
pp. 653-662 ◽  
Author(s):  
Oleg Kochukhov ◽  
Nicolai Piskunov
Keyword(s):  
High Resolution ◽  
Magnetic Fields ◽  
Medium Size ◽  
General Properties ◽  
The Future ◽  
Large Telescopes ◽  
New Generation ◽  
Optical Telescopes

AbstractWe review general properties and capabilities of the instrumentation employed to diagnose cosmic magnetic fields using medium-size and large optical telescopes. During the last decade these spectropolarimeters and high-resolution spectrographs have been successfully used to detect and characterize magnetic fields in stars across the H-R diagram. A new generation of high-resolution spectropolarimeters will benefit from the large collecting area of the future E-ELT and currently operating 8-m class telescopes. We review plans to develop spectropolarimeters for these very large telescopes and outline a number of science cases where new spectropolarimetric instrumentation is expected to play a key role.

scholarly journals Radiative Signatures of Neutron Beams in AGN

1994 ◽  
Vol 159 ◽  
pp. 345-345
Author(s):  
Ifeanyi E. Ekejiuba
Keyword(s):  
Neutron Beam ◽  
Energy Transport ◽  
Active Galaxies ◽  
Radio Sources ◽  
Beam Transport ◽  
Extragalactic Radio Sources ◽  
Production Region ◽  
Neutron Beams

The escape of relativistic neutrons from their production region can have various consequencies for the morphology of active galaxies. The phenomena of luminosity gaps and radio jet lighting in extragalactic radio sources (EGRSs) fit into the model that employs relativistic neutrons as the vector for particle and energy transport out of the central engines of AGNs. The central radio gaps reveal themselves as regions of relativistic neutron beam transport. The relativistic neutrons, which decay in flight after traveling for ∼ 103 γn s, produce secondaries which are responsible for the radio jet lighting and the associated phenomena in EGRSs.

Magnetized fluidized bed with binary admixture of magnetizable and nonmagnetizable particles

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Quanhong Zhu ◽  
Hongzhong Li ◽  
Qingshan Huang
Keyword(s):  
Magnetic Fields ◽  
Flow Regime ◽  
Fluidized Bed ◽  
Transport Phenomena ◽  
Commercial Application ◽  
Regime Transition ◽  
Gas Filtration ◽  
Flow Regime Transition ◽  
The Future

Abstract Magnetic fields were used to successfully improve the fluidization quality of magnetizable particles, forming the magnetized fluidized bed (MFB). Moreover, researchers found that the binary admixture of magnetizable and nonmagnetizable particles could also be used in the MFB, creating the admixture MFB. Consequently, the MFB technique is no longer restricted to the few magnetizable particles in nature and can be extended to numerous nonmagnetizable particles. Nevertheless, research on the admixture of MFB is far from sufficient, severely hindering its commercial application in the chemical and biochemical industries. To deepen our understanding in this area, this review summarizes the relevant findings, which mainly include (1) transport phenomena in the gas-solid admixture MFB with Geldart B particles; (2) elimination of the abnormal fluidization phenomena in the gas-solid admixture MFB with Geldart C particles; (3) flow regime transition of the liquid-solid admixture MFB under both the magnetization-FIRST and magnetization-LAST operation modes; and (4) application of the pure MFB in the fields of gas filtration and coal dry separation. Finally, critical comments are made on the shortcomings of the reported research with the hope that more efforts could be devoted to these aspects in the future.

scholarly journals Imaging of dynamic magnetic fields with spin-polarized neutron beams

2015 ◽  
Vol 17 (4) ◽  
pp. 043047 ◽  
Author(s):  
A S Tremsin ◽  
N Kardjilov ◽  
M Strobl ◽  
I Manke ◽  
M Dawson ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Neutron Beams ◽  
Spin Polarized ◽  
Polarized Neutron

6. The future of solar physics

2020 ◽  
pp. 149-154
Author(s):  
Philip Judge
Keyword(s):  
Solar Wind ◽  
Magnetic Fields ◽  
Coronal Mass Ejections ◽  
Solar Physics ◽  
Solar Telescope ◽  
The Sun ◽  
New Era ◽  
The Future ◽  
To Come ◽  
Orbiter Mission

Solar physics is a historically data-starved science, but about to becomes less so. ‘The future of solar physics’ looks at new facilities, either online or about to come online, such as the Daniel K. Inouye Solar Telescope on Maui. This aims to see, through measurements of coronal magnetic fields and plasma, how the Sun’s magnetic fields generate flares, coronal mass ejections, and the solar wind. Other major missions include NASA’s Parker Solar Probe and the European Solar Orbiter mission, spacecraft intended to orbit the Sun in new ways and from different viewpoints on Earth. Supported by increasingly powerful computers, these missions are ushering in a new era.

scholarly journals Modeling the solar cycle: what the future holds

2011 ◽  
Vol 7 (S286) ◽  
pp. 54-64
Author(s):  
Dibyendu Nandy
Keyword(s):  
Solar Cycle ◽  
Magnetic Fields ◽  
Solar Interior ◽  
Magnetic Field Generation ◽  
Kinematic Dynamo ◽  
The Future ◽  
Dynamo Mechanism ◽  
Stellar Magnetic Fields ◽  
Magnetohydrodynamic Models ◽  
Evolution With Time

AbstractStellar magnetic fields are produced by a magnetohydrodynamic dynamo mechanism working in their interior – which relies on the interaction between plasma flows and magnetic fields. The Sun, being a well-observed star, offers an unique opportunity to test theoretical ideas and models of stellar magnetic field generation. Solar magnetic fields produce sunspots, whose number increases and decreases with a 11 year periodicity – giving rise to what is known as the solar cycle. Dynamo models of the solar cycle seek to understand its origin, variation and evolution with time. In this review, I summarize observations of the solar cycle and describe theoretical ideas and kinematic dynamo modeling efforts to address its origin. I end with a discussion on the future of solar cycle modeling – emphasizing the importance of a close synergy between observational data assimilation, kinematic dynamo models and full magnetohydrodynamic models of the solar interior.

scholarly journals Rapid inverting of the polarization of a neutron beam using large amplitude oscillating magnetic fields

1970 ◽  
Vol 79 (1) ◽  
pp. 82-92 ◽  
Author(s):  
H. Kendrick ◽  
J.S. King ◽  
S.A. Werner ◽  
A. Arrott
Keyword(s):  
Magnetic Fields ◽  
Neutron Beam ◽  
Large Amplitude

DAMPING CHARACTERISTICS OF MR FLUIDS IN LOW MAGNETIC FIELDS

2001 ◽  
Vol 15 (06n07) ◽  
pp. 829-836 ◽  
Author(s):  
HIDEYA NISHIYAMA ◽  
TADAMASA OYAMA ◽  
TOYOHISA FUJITA
Keyword(s):  
Magnetic Fields ◽  
Flat Plate ◽  
Phase Difference ◽  
Magnetic Fluid ◽  
Cluster Formation ◽  
Cluster Structure ◽  
Viscous Drag ◽  
Damping Characteristics ◽  
Mr Fluids ◽  
Viscous Drag Force

The cluster structure is visualized and the physical properties of new two types of nano MR fluids are measured in the applied magnetic fields. Correlating to these measurements, the damping characteristics of an oscillating flat plate immersed in two types of nano MR fluids such as damping amplitude, phase difference, viscous damping coefficient and viscous drag force acted on a flat plate are experimentally clarified, comparing with those of commercial magnetic fluid from the fluiddynamic points of view. It is shown that the resonance of damping amplitude and phase difference are very sensitive to the applied magnetic field, and further the damping effect of MR fluid is about ten times stronger than that of the commercial magnetic fluid even in low magnetic fields of 50–100 Gauss due to the robust cluster formation.

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