scholarly journals The dose response of high‐resolution diode‐type detectors and the role of their structural components in strong magnetic field

2020 ◽  
Author(s):  
Tuba Tekin ◽  
Isabel Blum ◽  
Björn Delfs ◽  
Ann‐Britt Schönfeld ◽  
Ralf‐Peter Kapsch ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Strong Magnetic Field ◽  
Dose Response ◽  
Structural Components

OC-0633: The dose response of high-resolution diode detectors in magnetic field

2020 ◽  
Vol 152 ◽  
pp. S353
Author(s):  
T. Tekin ◽  
B. Delfs ◽  
I. Büsing ◽  
A. Schönfeld ◽  
B. Poppe ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Dose Response

scholarly journals The role of the construction and sensitive volume of compact ionization chambers on the magnetic field‐dependent dose response

2021 ◽  
Author(s):  
Björn Delfs ◽  
Isabel Blum ◽  
Tuba Tekin ◽  
Ann‐Britt Schönfeld ◽  
Rafael Kranzer ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Dose Response ◽  
Sensitive Volume ◽  
Ionization Chambers ◽  
Field Dependent ◽  
The Magnetic Field

scholarly journals INFLUENCE OF THE SADDLE-SPLAY CONSTANT ON THE DIRECTOR FIELD DISTRIBUTION IN STRONG MAGNETIC FIELDS

2017 ◽  
Vol 20 (3) ◽  
pp. 128-135
Author(s):  
A.A. Kudreyko ◽  
R.N. Migranova ◽  
A.R. Khafizov
Keyword(s):  
Magnetic Field ◽  
Free Energy ◽  
Magnetic Fields ◽  
Strong Magnetic Field ◽  
Parallel Plates ◽  
Lagrange Equations ◽  
Director Field ◽  
Strong Magnetic Fields ◽  
Anchoring Effects

The role of anchoring effects in thin nematic films confined between two parallel plates was theoretically examined. The bulk and surface free energy densities weree xpanded up to O(e2) and the perturbated contributions were calculated. It is shown that the minimum of the free energy corresponds to the solution of the Euler-Lagrange equations and satisfies the Ericksen inequalities. The identified bifurcation points can estimate the influence of the saddle-splay constant k24 towards periodic perturbations of a director in the presence of strong magnetic field.

Imaging of ferroelectric domain walls by electron holography

1992 ◽  
Vol 50 (1) ◽  
pp. 246-247
Author(s):  
Xiao Zhang
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Domain Walls ◽  
Ferroelectric Domain ◽  
Object Wave ◽  
Electron Holography ◽  
High Resolution Imaging ◽  
Quantitative Measurements ◽  
Resolution Imaging ◽  
Electron Microscopes

Electron holography has recently been available to modern electron microscopy labs with the development of field emission electron microscopes. The unique advantage of recording both amplitude and phase of the object wave makes electron holography a effective tool to study electron optical phase objects. The visibility of the phase shifts of the object wave makes it possible to directly image the distributions of an electric or a magnetic field at high resolution. This work presents preliminary results of first high resolution imaging of ferroelectric domain walls by electron holography in BaTiO3 and quantitative measurements of electrostatic field distribution across domain walls.

A Super-High-Resolution HVEM (H-1500) Newly Installed in NIRIM

1990 ◽  
Vol 48 (1) ◽  
pp. 142-143
Author(s):  
S. Horiuchi ◽  
Y. Matsui
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Chromatic Aberration ◽  
Inorganic Materials ◽  
Electron Gun ◽  
Resolving Power ◽  
National Budget ◽  
Voltage Electron ◽  
Specimen Holder ◽  
The Magnetic Field

A new high-voltage electron microscope (H-1500) specially aiming at super-high-resolution (1.0 Å point-to-point resolution) is now installed in National Institute for Research in Inorganic Materials ( NIRIM ), in collaboration with Hitachi Ltd. The national budget of about 1 billion yen including that for a new building has been spent for the construction in the last two years (1988-1989). Here we introduce some essential characteristics of the microscope.(1) According to the analysis on the magnetic field in an electron lens, based on the finite-element-method, the spherical as well as chromatic aberration coefficients ( Cs and Cc ). which enables us to reach the resolving power of 1.0Å. have been estimated as a function of the accelerating As a result of the calculaton. it was noted that more than 1250 kV is needed even when we apply the highest level of the technology and materials available at present. On the other hand, we must consider the protection against the leakage of X-ray. We have then decided to set the conventional accelerating voltage at 1300 kV. However. the maximum accessible voltage is 1500 kV, which is practically important to realize higher voltage stabillity. At 1300 kV it is expected that Cs= 1.7 mm and Cc=3.4 mm with the attachment of the specimen holder, which tilts bi-axially in an angle of 35° ( Fig.1 ). In order to minimize the value of Cc a small tank is additionally placed inside the generator tank, which must serve to seal the magnetic field around the acceleration tube. An electron gun with LaB6 tip is used.

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