Electron gun for high-luminance high-resolution YAG projection CRT

1998 ◽  
Author(s):  
Jianbo Cheng ◽  
Jun Wang ◽  
Zhenxiang Cheng ◽  
Kangcheng Qi ◽  
Min Zhou
Keyword(s):  
High Resolution ◽  
Electron Gun ◽  
High Luminance

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.

Progress with the IBM Very High Resolution STEM

2001 ◽  
Vol 7 (S2) ◽  
pp. 234-235
Author(s):  
RE. Batson ◽  
H.W. Mook ◽  
P. Kruit ◽  
O.L. Krivanek ◽  
N. Dellby
Keyword(s):  
High Resolution ◽  
Detection System ◽  
Spherical Aberration ◽  
Electron Gun ◽  
Fringe Field ◽  
Recent Effort ◽  
Electron Monochromator ◽  
Set Up ◽  
Main Activity ◽  
Many Sources

The IBM high resolution STEM project has now reached the point where integration of new subsystems into the instrument is the main activity. During the past three years, we have demonstrated a 50meV EELS resolution using a high brightness electron monochromator incorporated into the electron gun [1, 2, 3], and better than 0.14mn spatial resolution using spherical aberration correction at 120KeV. [4] Recent effort has been to identify and remove many sources of instabilities in the original instrument; to rebuild several existing subsidiary pieces of equipment such as the ADF detector, the EELS spectrometer electron optical coupling, and the EELS CCD detection system; and to set up software and hardware control of each system to allow routine operation.The new STEM column is summarized in Fig. 1. Briefly, the original VG gun flange has been lowered about 4cm, using a spacer, to allow insertion of the Fringe Field monochromator.

Improved High Resolution Electron Gun for Television Cameras

1963 ◽  
Vol 72 (10) ◽  
pp. 792-794
Author(s):  
S. Gray ◽  
P. C. Murray ◽  
O. J. Ziemelis
Keyword(s):  
High Resolution ◽  
Electron Gun ◽  
Resolution Electron

High-Resolution Spectrochemical Analysis of Columnar Defects Formed in Bi2Sr2CaCu2Ox by Swift Heavy Ion Irradiation

2003 ◽  
Vol 792 ◽  
Author(s):  
F. Kano ◽  
M. Terasawa ◽  
T. Mitamura ◽  
T. Kambara ◽  
Y. Sasaki ◽  
...  
Keyword(s):  
High Resolution ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
High Energy ◽  
Electron Gun ◽  
Spectrochemical Analysis ◽  
Columnar Defect ◽  
Defect Center ◽  
X Ray ◽  
Columnar Defects

ABSTRACTSingle-crystal specimen of high-temperature superconductor Bi2Sr2CaCu2Ox was irradiated with 3.5 GeV Xe ions at room temperature up to 1.0 × 1011 ion/cm2. Significant enhancement of magnetization by the irradiation was confirmed. The irradiated specimens were studied by using a high-resolution transmission electron microscope with field emission electron gun (FE-TEM), and, also, with an energy dispersive x-ray analyzer (EDS). Columnar defects with diameter of about 6 nm were observed along the incident ion tracks. By nanoscale high-resolution x-ray spectrochemical analysis across the columnar defect, enrichment of Cu and depletion of Bi, Sr and Ca in the columnar defect center, and vice versa in the outskirts of the defect, was found for the first time. Oxygen depletion in the defect, and increased distribution outside of the defect were also found by electron energy loss spectroscopy. This experimental evidence suggests that the columnar defects are formed as a consequence of Coulomb explosion induced by the electronic excitation of the high-energy heavy ions.

High-luminance and high-resolution 5-in. polycrystal phosphor screen

2003 ◽  
Author(s):  
Gang Yang ◽  
Jianbo Cheng ◽  
Zulun Lin ◽  
Qionghua Wang ◽  
Wenbing Chen
Keyword(s):  
High Resolution ◽  
High Luminance ◽  
Phosphor Screen

Tantalum replicas of freeze-fractured proteoliposomes

1986 ◽  
Vol 44 ◽  
pp. 56-57
Author(s):  
M.J. Costello ◽  
F. Burgess ◽  
J. Escaig
Keyword(s):  
High Resolution ◽  
Carbon Deposition ◽  
Freeze Fracture ◽  
Metal Films ◽  
Electron Gun ◽  
Intramembrane Particles ◽  
Fine Grained ◽  
Tantalum Metal ◽  
Pure Tantalum

Tantalum will form thin, fine-grained metal films, and under some conditions, continuous films with high resolution. We have prepared pure tantalum metal replicas of frozen fractured proteoliposomes employing a new electron gun designed for the Reichert Cryofract 190 freeze-fracture-etch device. The replicas are similar in appearance to those made with conventional platinum/carbon deposition except that tantalum replicas can be made thinner and with smaller grains, and the intramembrane particles (IMPs) which occur on fracture faces have smaller dimensions.

High-resolution SEM of kidney tissue using cryo-techniques

1990 ◽  
Vol 48 (3) ◽  
pp. 8-9
Author(s):  
P Walther ◽  
P Herter ◽  
J Hentschel ◽  
H Hentschel
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Room Temperature ◽  
Kidney Tissue ◽  
Cell Types ◽  
Electron Gun ◽  
Precise Localization ◽  
Transmission Electron ◽  
Different Cell Types ◽  
Scanning Electron

The kidney is a complex zonated organ with a variety of different cell types. For the study of the functional and morphological features, the precise localization in the zones is relevant, which requires the evaluation of rather large portions of tissue. Transmission electron microscopy of replicas of tissue is limited by difficulties to obtain sufficiently large specimens. In order to overcome this problem cryopreparation methods and high resolution field emission scanning electron microscopy (SEM) were used.1 mm3 cubes of perfusion fixed rabbit kidneys cryoprotected with glycerol were frozen by plunging into liquid propane. For further preparation two different methods were employed.1: Samples were fractured in liquid nitrogen with a scalpel, freeze substituted using methanol with glutaraldehyde and osmiumtetroxid, warmed to room temperature, critical point dried, and coated by electron gun evaporation with 2 nm of platinum at an angle of 45°, and 10 nm of carbon perpendicularly.

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