scholarly journals rf design studies on the 750 MHz radio frequency quadrupole linac for proton-induced x-ray emission analysis

2019 ◽  
Vol 22 (5) ◽  
Author(s):  
Hermann Winrich Pommerenke ◽  
Vittorio Bencini ◽  
Alexej Grudiev ◽  
Alessandra Maria Lombardi ◽  
Serge Mathot ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Quadrupole ◽  
Emission Analysis ◽  
Design Studies ◽  
X Ray ◽  
Rf Design

scholarly journals Development of a radio-frequency quadrupole cooler for high beam currents

2017 ◽  
Vol 20 (12) ◽  
Author(s):  
Ramzi Boussaid ◽  
G. Ban ◽  
G. Quéméner ◽  
Y. Merrer ◽  
J. Lorry
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Quadrupole ◽  
High Beam ◽  
Beam Currents

scholarly journals Effects in the Optical and Structural Properties Caused by Mg or Zn Doping of GaN Films Grown via Radio-Frequency Magnetron Sputtering Using Laboratory-Prepared Targets

2021 ◽  
Vol 11 (15) ◽  
pp. 6990
Author(s):  
Erick Gastellóu ◽  
Godofredo García ◽  
Ana María Herrera ◽  
Crisoforo Morales ◽  
Rafael García ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Magnetron Sputtering ◽  
Radio Frequency ◽  
Hexagonal Structure ◽  
Binding Energies ◽  
Radio Frequency Magnetron ◽  
Radio Frequency Magnetron Sputtering ◽  
X Ray ◽  
Diffraction Patterns ◽  
Mg Doped

GaN films doped with Mg or Zn were obtained via radio-frequency magnetron sputtering on silicon substrates at room temperature and used laboratory-prepared targets with Mg-doped or Zn-doped GaN powders. X-ray diffraction patterns showed broadening peaks, which could have been related to the appearance of nano-crystallites with an average of 7 nm. Scanning electron microscopy and transmission electron microscopy showed good adherence to silicon non-native substrate, as well as homogeneity, with a grain size average of 0.14 µm, and 0.16 µm for the GaN films doped with Zn or Mg, respectively. X-ray photo-electron spectroscopy demonstrated the presence of a very small amount of magnesium (2.10 mol%), and zinc (1.15 mol%) with binding energies of 1303.18, and 1024.76 eV, respectively. Photoluminescence spectrum for the Zn-doped GaN films had an emission range from 2.89 to 3.0 eV (429.23–413.50 nm), while Mg-doped GaN films had an energy emission in a blue-violet band with a range from 2.80 to 3.16 eV (443.03–392.56 nm). Raman spectra showed the classical vibration modes A1(TO), E1(TO), and E2(High) for the hexagonal structure of GaN.

scholarly journals Effects of Thermal Annealing on the Properties of Zirconium-Doped MgxZn1−XO Films Obtained through Radio-Frequency Magnetron Sputtering

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 373
Author(s):  
Wen-Yen Lin ◽  
Feng-Tsun Chien ◽  
Hsien-Chin Chiu ◽  
Jinn-Kong Sheu ◽  
Kuang-Po Hsueh
Keyword(s):  
Magnetron Sputtering ◽  
Radio Frequency ◽  
Photoelectron Spectroscopy ◽  
Annealing Temperature ◽  
Radio Frequency Magnetron ◽  
Radio Frequency Magnetron Sputtering ◽  
X Ray Diffraction ◽  
Free Electrons ◽  
X Ray ◽  
Mg Content

Zirconium-doped MgxZn1−xO (Zr-doped MZO) mixed-oxide films were investigated, and the temperature sensitivity of their electric and optical properties was characterized. Zr-doped MZO films were deposited through radio-frequency magnetron sputtering using a 4-inch ZnO/MgO/ZrO2 (75/20/5 wt%) target. Hall measurement, X-ray diffraction (XRD), transmittance, and X-ray photoelectron spectroscopy (XPS) data were obtained. The lowest sheet resistance, highest mobility, and highest concentration were 1.30 × 103 Ω/sq, 4.46 cm2/Vs, and 7.28 × 1019 cm−3, respectively. The XRD spectra of the as-grown and annealed Zr-doped MZO films contained MgxZn1−xO(002) and ZrO2(200) coupled with Mg(OH)2(101) at 34.49°, 34.88°, and 38.017°, respectively. The intensity of the XRD peak near 34.88° decreased with temperature because the films that segregated Zr4+ from ZrO2(200) increased. The absorption edges of the films were at approximately 348 nm under 80% transmittance because of the Mg content. XPS revealed that the amount of Zr4+ increased with the annealing temperature. Zr is a potentially promising double donor, providing up to two extra free electrons per ion when used in place of Zn2+.

Matching an H– beam into a radio frequency quadrupole at Rutherford Appleton Laboratory

2014 ◽  
Vol 85 (2) ◽  
pp. 02A745
Author(s):  
C. Gabor ◽  
J. J. Back ◽  
D. C. Faircloth ◽  
S. R. Lawrie ◽  
A. P. Letchford
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Quadrupole ◽  
Rutherford Appleton Laboratory ◽  
H Beam

scholarly journals In-situ x-ray studies of compositional control during synthesis of LaGaO3 by radio frequency-magnetron sputtering

2015 ◽  
Vol 107 (8) ◽  
pp. 081606 ◽  
Author(s):  
Matthew J. Highland ◽  
Dillon D. Fong ◽  
Guangxu Ju ◽  
Carol Thompson ◽  
Peter M. Baldo ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Radio Frequency ◽  
Radio Frequency Magnetron ◽  
Radio Frequency Magnetron Sputtering ◽  
X Ray ◽  
Compositional Control

Ionic regulation and buoyancy in some planktonic organisms

1993 ◽  
Vol 73 (1) ◽  
pp. 15-23 ◽  
Author(s):  
C. Newton ◽  
W. T. W. Potts
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Body ◽  
Coelomic Fluid ◽  
Ionic Regulation ◽  
High Concentration ◽  
Emission Analysis ◽  
X Ray ◽  
Scanning Electron ◽  
Gastrovascular System

Magnesium/chlorine and sulphur/chlorine ratios have been measured in the body fluids of some planktonic organisms by x-ray emission analysis of frozen hydrated specimens in a scanning electron microscope. Homarus vulgaris (Anthropoda: Decapoda) larvae excluded Mg2+ and SO42-ions from the haemolymph, but to a lesser extent than does the adult lobster. Bipinnaria larvae of Asterias (Echinodermata) excluded Mg2+ and SO42-ions from the coelomic fluid. Obelia medusae excluded Mg2+ and SO42-ions from the mesogloea but concentrate them in the gastrovascular system. The high concentration of sulphate in the gastrovascular fluid of medusae has been confirmed by rhodizonate titration in Cyanea and Rhizostoma jellyfish. Some implications of magnesium and sulphate regulation are discussed.

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