scholarly journals Spin simulations in eRHIC Wien filter

2019 ◽  
Author(s):  
Francois Meot ◽  
Erdong Wang
Keyword(s):  
Wien Filter

Low-workfunction field-emission source for high-resolution EELS

1987 ◽  
Vol 45 ◽  
pp. 132-133
Author(s):  
P. E. Batson
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Electron Probe ◽  
Collection Efficiency ◽  
Electron Sources ◽  
Wien Filter ◽  
Half Angle ◽  
Thermal Emitter ◽  
Electron Energy Loss ◽  
Intrinsic Energy

In recent years,instrumentation for electron energy loss spectroscopy (EELS) has been steadily improved to increase energy resolution and collection efficiency. At present 0.40eV at 10mR collection half angle is available with commercial magnetic sectors (e.g. Gatan, Inc. and VG Microscopes, Ltd.), and 70meV at 10mR has been demonstrated by use of a Wien filter within a large deceleration field. When these high resolution spectrometers are coupled to the modern small electron probe instrument, we obtain a tool which promises to reveal local changes in bandstructure and bonding near defects and interfaces in heterogeneous materials.Unfortunately, typical electron sources have intrinsic energy widths which limit attainable spectroscopic resolution in the absence of some monochromation system. For instance, the W thermal emitter has a half width of about 1eV.

Interferometric (Fourier-Spectroscopic) Measurement of Electron Energy Distributions

1990 ◽  
Vol 48 (2) ◽  
pp. 110-111 ◽  
Author(s):  
F. Hasselbach ◽  
A. Schäfer
Keyword(s):  
Group Velocity ◽  
Wave Packets ◽  
Index Of Refraction ◽  
Electron Wave ◽  
Fringe Contrast ◽  
Faraday Cage ◽  
Optical Index ◽  
Wien Filter ◽  
Coherent Wave ◽  
Electric And Magnetic Fields

Möllenstedt and Wohland proposed in 1980 two methods for measuring the coherence lengths of electron wave packets interferometrically by observing interference fringe contrast in dependence on the longitudinal shift of the wave packets. In both cases an electron beam is split by an electron optical biprism into two coherent wave packets, and subsequently both packets travel part of their way to the interference plane in regions of different electric potential, either in a Faraday cage (Fig. 1a) or in a Wien filter (crossed electric and magnetic fields, Fig. 1b). In the Faraday cage the phase and group velocity of the upper beam (Fig.1a) is retarded or accelerated according to the cage potential. In the Wien filter the group velocity of both beams varies with its excitation while the phase velocity remains unchanged. The phase of the electron wave is not affected at all in the compensated state of the Wien filter since the electron optical index of refraction in this state equals 1 inside and outside of the Wien filter.

Design of a Wien Filter Type Heavy Ion Beam Probe System for the Measurement of Plasma Potential

1987 ◽  
Vol 26 (Part 1, No. 5) ◽  
pp. 755-759 ◽  
Author(s):  
Hideki Fujita ◽  
Keizô Adati ◽  
Ryuhei Kumazawa ◽  
Shoichi Okamura ◽  
Teruyuki Sato
Keyword(s):  
Ion Beam ◽  
Heavy Ion ◽  
Plasma Potential ◽  
Wien Filter ◽  
Probe System ◽  
Filter Type ◽  
Heavy Ion Beam ◽  
Heavy Ion Beam Probe

Analysis of Wien filter spectra from Hall thruster plumes

2015 ◽  
Vol 86 (7) ◽  
pp. 073502 ◽  
Author(s):  
Wensheng Huang ◽  
Rohit Shastry
Keyword(s):  
Hall Thruster ◽  
Wien Filter

scholarly journals The driving circuit of the waveguide RF Wien filter for the deuteron EDM precursor experiment at COSY

2020 ◽  
Vol 15 (03) ◽  
pp. P03021-P03021 ◽  
Author(s):  
J. Slim ◽  
A. Nass ◽  
F. Rathmann ◽  
H. Soltner ◽  
G. Tagliente ◽  
...  
Keyword(s):  
Wien Filter ◽  
Driving Circuit

scholarly journals Estimation of Systematic Errors for Deuteron Electric Dipole Moment Search at COSY

2016 ◽  
Vol 40 ◽  
pp. 1660099 ◽  
Author(s):  
Stanislav Chekmenev
Keyword(s):  
Dipole Moment ◽  
Charged Particle ◽  
Experimental Method ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Systematic Errors ◽  
Great Level ◽  
Spin Motion ◽  
Wien Filter ◽  
Systematic Effects

An experimental method which is aimed to find a permanent EDM of a charged particle was proposed by the JEDI (Jülich Electric Dipole moment Investigations) collaboration. EDMs can be observed by their influence on spin motion. The only possible way to perform a direct measurement is to use a storage ring. For this purpose, it was decided to carry out the first precursor experiment at the Cooler Synchrotron (COSY). Since the EDM of a particle violates CP invariance it is expected to be tiny, treatment of all various sources of systematic errors should be done with a great level of precision. One should clearly understand how misalignments of the magnets affects the beam and the spin motion. It is planned to use a RF Wien filter for the precusor experiment. In this paper the simulations of the systematic effects for the RF Wien filter device method will be discussed.

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