scholarly journals Influence of magnetic field taper on second harmonic 394GHz gyrotron oscillator

AIP Advances ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 015126
Author(s):  
Xuewei Wang ◽  
Qianzhong Xue ◽  
Shan Zhang ◽  
Guohui Zhao ◽  
Gaofeng Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Second Harmonic ◽  
Gyrotron Oscillator

Analysis and Design of 460 GHz Microwave Gyrotron Oscillator

2020 ◽  
Vol 38 (3B) ◽  
pp. 161-167
Author(s):  
Luma Y. Abbas ◽  
Nedal A. Hussain
Keyword(s):  
Magnetic Field ◽  
Second Harmonic ◽  
Velocity Ratio ◽  
Particle Interaction ◽  
Beam Current ◽  
Wave Source ◽  
Analysis And Design ◽  
Gyrotron Oscillator ◽  
Millimeter Wave Source ◽  
Good Agreement

This paper is concerned with the analysis and design of a gyrotron oscillator with 460 GHz that can excite both modes (TE231) the fundamental (230GHz) and (TE061, TE261) second harmonic (near 460GHz). The oscillator is operated with 12KV beam voltage and 100mA beam current, and a computer program was developed to study the cavity in this oscillator and the wave-particle interaction inside it using the forward finite difference technique as a numerical method. The input data of the program are electron energy, velocity ratio, normalized cavity length, the normalized value of the external magnetic field, the mode number (m,n,l), and nth-non van shining root of J_m^' (x)=0 to calculate the beam and starting currents, frequency and quality factor of the cavity. The results show good agreement with other reported works [10]- [12]- [13]- [14], [15] .This oscillator can serve as a millimeter-wave source at the magnetic field of (16.4T) for enhanced nuclear magnetic resonance and can be used to perform the biological experiment.

Giant Magnetic Field Induced Effects in the Second-Harmonic Generation in a Planar Anisotropic Ta/Co/Pt Structure

JETP Letters ◽  
2020 ◽  
Vol 111 (6) ◽  
pp. 333-337
Author(s):  
T. V. Murzina ◽  
I. A. Kolmychek ◽  
N. S. Gusev ◽  
A. I. Maidykovskii
Keyword(s):  
Magnetic Field ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic

scholarly journals An Emission Line in the Hard X-Ray Spectrum of Hercules X-1: Quantized Cyclotron Emission from the Neutron Star

1977 ◽  
Vol 43 ◽  
pp. 34-34
Author(s):  
W. Pietsch ◽  
C. Reppin ◽  
R. Staubert ◽  
J. Truemper ◽  
W. Voges ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Neutron Star ◽  
Field Strength ◽  
Second Harmonic ◽  
Narrow Line ◽  
Electron Cyclotron Emission ◽  
Polar Cap ◽  
Astrophysical Application ◽  
X Ray ◽  
Cyclotron Emission

A four hour balloon observation of HERC X-l during the 'On-state' in the 35 day cycle was performed on May 3rd, 1976. The 1.24 second pulsations show a pulsed fraction of 58 ± 8% in the 18-31 KeV interval. A pulsed flux (1.24 sec) was discovered in the 31-88 KeV interval with a pulsed fraction of 51 ± 14%. The spectrum of the pulsed flux can be represented up to 50 KeV by an exponential distribution with KT approximately 8 KeV. At approximately 58 KeV a strong and narrow line feature occurs which we interpret as electron cyclotron emission (ΔN = 1 Landau transition) from the polar cap plasma of the rotating neutron star. The corresponding magnetic field strength is approximately 5 x 1012 Gauss, neglecting gravitational red shift. There is evidence for a second harmonic at approximately 110 KeV (ΔN = 2 ).The astrophysical application of this discovery will be discussed in some detail.

NONLINEAR MAGNETO-OPTICAL EFFECT IN VACUUM: INHOMOGENEITY-ORIGINATED SECOND-HARMONIC GENERATION IN DC MAGNETIC FIELD

1992 ◽  
Vol 01 (01) ◽  
pp. 51-72 ◽  
Author(s):  
Y.J. DING ◽  
A.E. KAPLAN
Keyword(s):  
Magnetic Field ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Quantum Electrodynamics ◽  
Second Harmonic ◽  
Intense Laser ◽  
Gaussian Laser Beam ◽  
Optical Wave ◽  
Dc Magnetic Field ◽  
Magneto Optical Effect

The photon-photon scattering predicted by quantum electrodynamics can give rise to second-harmonic generation of intense laser radiation in a dc magnetic field due to broken symmetry of interaction even in the “box” diagram approximation. This effect is possible only when the field system (i.e. optical wave+dc field) is inhomogeneous, in particular when a Gaussian laser beam (i.e. nonplane wave) propagates in either homogeneous or inhomogeneous dc magnetic field.

scholarly journals Performance Validation of a Planar Hall Resistance Biosensor through Beta-Amyloid Biomarker

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 434 ◽  
Author(s):  
SungJoon Kim ◽  
Sri Ramulu Torati ◽  
Artem Talantsev ◽  
ChangYeop Jeon ◽  
SungBae Lee ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Second Harmonic ◽  
Signal To Noise Ratio ◽  
Point Of Care ◽  
Magnetic Sensors ◽  
Hall Resistance ◽  
Field Mode ◽  
Mode Method ◽  
Performance Validation

Magnetic sensors have great potential for biomedical applications, particularly, detection of magnetically-labeled biomolecules and cells. On the basis of the advantage of the planar Hall effect sensor, which consists of improved thermal stability as compared with other magnetic sensors, we have designed a portable biosensor platform that can detect magnetic labels without applying any external magnetic field. The trilayer sensor, with a composition of Ta (5 nm)/NiFe (10 nm)/Cu (x = 0 nm~1.2 nm)/IrMn (10 nm)/Ta (5 nm), was deposited on a silicon wafer using photolithography and a sputtering system, where the optimized sensor sensitivity was 6 μV/(Oe∙mA). The detection of the magnetic label was done by comparing the signals obtained in first harmonic AC mode (1f mode) using an external magnetic field and in the second harmonic AC mode (2f mode) with a self-field generated by current passing through the sensor. In addition, a technique for the β-amyloid biomarker-based antibody-antigen sandwich model was demonstrated for the detection of a series of concentrations of magnetic labels using the self-field mode method, where the signal-to-noise ratio (SNR) was high. The generated self-field was enough to detect an immobilized magnetic tag without an additional external magnetic field. Hence, it could be possible to reduce the device size to use the point-of-care testing using a portable circuit system.

Magnetic-Field-Induced Optical Second-Harmonic Generation Study of Co/Pt and Co/Ta Interfaces

2020 ◽  
Vol 130 (4) ◽  
pp. 555-561
Author(s):  
I. A. Kolmychek ◽  
V. V. Radovskaya ◽  
K. A. Lazareva ◽  
E. E. Shalygina ◽  
N. S. Gusev ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Optical Second Harmonic Generation
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