Quadrupole Doublet, Triplet

2018 ◽  
pp. 36-44
Keyword(s):  
Quadrupole Doublet

scholarly journals Simulation of the CBETA 4-pass FFAG ERL using field maps — exclusively

2019 ◽  
Vol 34 (36) ◽  
pp. 1942038
Author(s):  
F. Méot ◽  
J. S. Berg ◽  
S. Brooks ◽  
D. Trbojevic ◽  
N. Tsoupas ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Energy Recovery ◽  
Single Channel ◽  
Quadrupole Doublet ◽  
Optical Components ◽  
Fixed Field ◽  
Magnet Technology ◽  
Energy Recovery Linac

The Cornell-BNL Electron Test Accelerator (CBETA), a four-pass, 150 MeV energy recovery linac (ERL), is now in construction at Cornell. Commissioning commenced on March 2019. A particularity of CBETA is that a single channel loop recirculates the four energies (42, 78, 114 and 150 MeV). The return loop arcs are based on fixed-field alternating gradient (FFAG) optics. The loop is comprised of 107 quadrupole-doublet cells, built using Halbach permanent magnet technology. Spreader and combiner sections (4 independent beam lines each) connect the 36 MeV linac to the FFAG arcs. We introduce here a start-to-end simulation of the 4-pass ERL, based entirely, and exclusively, on the use of magnetic field maps to model the optical components.

Development of a high-current microbeam system

2014 ◽  
Vol 24 (03n04) ◽  
pp. 101-110 ◽  
Author(s):  
S. Matsuyama ◽  
K. Ishii ◽  
S. Suzuki ◽  
A. Terakawa ◽  
M. Fujiwara ◽  
...  
Keyword(s):  
Quadrupole Doublet ◽  
Spot Size ◽  
Beam Current ◽  
Chemical State ◽  
High Current ◽  
Rigid Support ◽  
Beam Spot ◽  
X Ray ◽  
Beam Spot Size

We report on the development of a high-current microbeam system for wavelength-dispersive X-ray micro particle-induced X-ray emission (WDX-[Formula: see text]-PIXE) for chemical state mapping. The microbeam system is composed of two slits and a quadrupole doublet lens mounted on a heavy rigid support. The microbeam system is installed immediately after a switching magnet. A beam brightness of [Formula: see text] is obtained at a half-divergence of 0.1 mrad. A beam current of more than 300 pA is obtained for object sizes of [Formula: see text] with a half-divergence of 0.2 mrad, which corresponds to a beam spot size of [Formula: see text]. The calculated spot size of the beam was [Formula: see text] and the measured spot size was [Formula: see text]. The WDX-[Formula: see text]-PIXE system with the microbeam system is now operational.

Asymmetry of quadrupole doublet of Mössbauer spectra in LiNbO3∶Fe

1980 ◽  
Vol 21 (2) ◽  
pp. 195-198 ◽  
Author(s):  
V. N. Belogurov ◽  
P. E. Senkov
Keyword(s):  
Mössbauer Spectra ◽  
Quadrupole Doublet ◽  
Mossbauer Spectra

MÖssbauer Study of a Tinife Shape Memory Alloy.

1991 ◽  
Vol 246 ◽  
Author(s):  
M. Jimenez ◽  
V. Marquina ◽  
S. Aburto ◽  
M.L. Marquina ◽  
R. Gomez ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Shape Memory ◽  
Room Temperature ◽  
Mossbauer Spectroscopy ◽  
Density Wave ◽  
Quadrupole Doublet ◽  
Mössbauer Study ◽  
Scanning Calorimetry ◽  
Mößbauer Spectroscopy ◽  
Wave Induced

AbstractMÖssbauer spectroscopy is very sensitive to structural transitions that may occur during a phase change of the type known to arise in the shape memory TiNiFe alloy. In this work we present the results of resistance vs temperature, differential scanning calorimetry (DSC) and Mössbauer spectroscopy (MS) measurements in Ti50Ni47Fe3 sample. The resistance vs temperature curve shows the usual sharp increase associated to the B2 → R transition at Tp = 245 K and then raises until a maximum is attained at ∼ 150 K. The DSC curve shows a peak maximum at the same temperature where the resistivity starts to increase. The room temperature Mössbauer spectrum consists of a single line, indicating that the iron atoms have cubic surroundings. As temperature is lowered, a small asymmetric quadrupole doublet begins to develop. The isomer shift (I.S.) and quadrupole splitting (ΔQ) values of this doublet increase with decreasing temperature until almost constant values are achieved at temperatures ∼ 100 K. We relate the changes in the Mössbauer spectra with previously proposed charge density wave induced premartensitic transition.

DEVELOPMENT OF AN EXTERNAL MICROBEAM-PIXE SYSTEM USING THIN FILM WINDOWS

1999 ◽  
Vol 09 (03n04) ◽  
pp. 143-150 ◽  
Author(s):  
A. KINOMURA ◽  
Y. HORINO ◽  
Y. MOKUNO ◽  
A. CHAYAHARA ◽  
N. TSUBOUCHI
Keyword(s):  
Thin Film ◽  
Proton Beam ◽  
Quadrupole Doublet ◽  
Spot Size ◽  
Polyimide Films ◽  
Emission Analysis ◽  
X Ray ◽  
Magnetic Quadrupole

A external microbeam system using polyimide windows has been developed for PIXE (Particle Induced X-ray Emission) analysis in air. A beamline consists of a magnetic quadrupole-doublet lens, cylindrical objective slits and double-deflection scanning coils. Polyimide films with a thickness of 3.5 μm or 7.5 μm were used for the exit windows. Spot sizes in air were measured by beam-induced fluorescence of CsI scintillation plates. A minimum spot size obtained was about 10 μm for a 1.5 MeV proton beam. PIXE-mapping images of a Cu grid were successfully obtained in air.

A Proposal for Improved Helium Microscopy

2014 ◽  
Vol 20 (5) ◽  
pp. 1619-1622 ◽  
Author(s):  
Frederick W. Martin
Keyword(s):  
Quadrupole Doublet ◽  
Objective Lens ◽  
Convergence Angle ◽  
Working Distance

AbstractElimination of the electrostatic objective lens and alternative use of a Cc- and Cs-corrected quadrupole doublet may increase the useful working distance of the helium microscope, improve its resolution from 3 to 0.3 Å, and improve its optimum convergence angle from 0.4 to 4 mrad.

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