RSI: Particle Sources, Optics and Acceleration; Particles Detectors

The dependence of extracted current on discharge gas pressure in neutral beam ion sources on HL-2A tokamak

H. L. Wei, J. Y. Cao, J. Rao, G. J. Lei, S. F. Jiang et al.
The discharge gas pressure is a key factor to influence the extracted current of ion source. In this paper, the dependence of extracted current on discharge gas pressure was investigated in detail at different arc discharge currents. The discharge gas pressure with a very broad range (0.1 Pa2.7 Pa) ... [Rev. Sci. Instrum. 83, 023302 (2012)] published Tue Feb 7, 2012.

Characteristics of low-energy ion beams extracted from a wire electrode geometry

M. Vasquez, Jr., S. Tokumura, T. Kasuya, S. Maeno, and M. Wada
Beams of argon ions with energies less than 50 eV were extracted from an ion source through a wire electrode extractor geometry. A retarding potential energy analyzer (RPEA) was constructed in order to characterize the extracted ion beams. The single aperture RPEA was used to determine the ion energ ... [Rev. Sci. Instrum. 83, 023301 (2012)] published Thu Feb 2, 2012.

In situ calibration of rotating sensor coils for magnet testing

P. Arpaia, M. Buzio, G. Golluccio, and L. Walckiers
An in situ procedure for calibrating equivalent magnetic area and rotation radius of rotating coils is proposed for testing accelerator magnets shorter than the measuring coil. The procedure exploits measurements of magnetic field and mechanical displacement inside a reference quadrupole magnet. In ... [Rev. Sci. Instrum. 83, 013306 (2012)] published Wed Jan 25, 2012.

A new experimental setup designed for the investigation of irradiation of nanosystems in the gas phase: A high intensity mass-and-energy selected cluster beam

G. Bruny, S. Eden, S. Feil, R. Fillol, K. El Farkh et al.
DIAM (Dispositif d'Irradiation d'Agregats Moleculaires) is a new experimental setup devoted to investigate processes induced by irradiation at the nanoscale. The DIAM apparatus is based on a combination of techniques including a particle beam from high-energy physics, a cluster source from molecular ... [Rev. Sci. Instrum. 83, 013305 (2012)] published Fri Jan 20, 2012.

A new detector for mass spectrometry: Direct detection of low energy ions using a multi-pixel photon counter

Edward S. Wilman, Sara H. Gardiner, Andrei Nomerotski, Renato Turchetta, Mark Brouard et al.
A new type of ion detector for mass spectrometry and general detection of low energy ions is presented. The detector consists of a scintillator optically coupled to a single-photon avalanche photodiode (SPAD) array. A prototype sensor has been constructed from a LYSO (LuYSiO(Ce)) scintillator crysta ... [Rev. Sci. Instrum. 83, 013304 (2012)] published Tue Jan 10, 2012.

A very low energy compact electron beam ion trap for spectroscopic research in Shanghai

J. Xiao, Z. Fei, Y. Yang, X. Jin, D. Lu et al.
In this paper, a new compact low energy electron beam ion trap, SH-PermEBIT, is reported. This electron beam ion trap (EBIT) can operate in the electron energy range of 605000 eV, with a current density of up to 100 A/cm. The low energy limit of this machine sets the record among the reported works ... [Rev. Sci. Instrum. 83, 013303 (2012)] published Tue Jan 10, 2012.

Electron spectrometer in adjustable triode configuration for photo-induced field emission measurements

B. Bornmann, S. Mingels, F. Dams, C. Prommesberger, R. Schreiner et al.
We have constructed a new ultrahigh vacuum apparatus with a triode configuration for the systematic investigation of photo-induced field emission (PFE) from metallic or semiconducting cathodes. These are exposed to electric fields up to 400 MV/m and laser irradiation by means of hole or mesh gates. ... [Rev. Sci. Instrum. 83, 013302 (2012)] published Mon Jan 9, 2012.

Arc discharge regulation of a megawatt hot cathode bucket ion source for the experimental advanced superconducting tokamak neutral beam injector

Yahong Xie, Chundong Hu, Sheng Liu, Caichao Jiang, Jun Li et al.
Arc discharge of a hot cathode bucket ion source tends to be unstable what attributes to the filament self-heating and energetic electrons backstreaming from the accelerator. A regulation method, which based on the ion density measurement by a Langmuir probe, is employed for stable arc discharge ope ... [Rev. Sci. Instrum. 83, 013301 (2012)] published Fri Jan 6, 2012.

A novel scaling law relating the geometrical dimensions of a photocathode radio frequency gun to its radio frequency properties

Shankar Lal, K. K. Pant, and S. Krishnagopal
Developing a photocathode RF gun with the desired RF properties of the pi-mode, such as field balance (e) ~1, resonant frequency f = 2856 MHz, and waveguide-to-cavity coupling coefficient beta ~1, requires precise tuning of the resonant frequencies of the independent full- and half-cells (f and f), ... [Rev. Sci. Instrum. 82, 123304 (2011)] published Tue Dec 27, 2011.

Characterization of plasma ion source utilizing anode spot with positively biased electrode for stable and high-current ion beam extraction

Yeong-Shin Park, Yuna Lee, Kyoung-Jae Chung, and Y. S. Hwang
The operating conditions of a rf plasma ion source utilizing a positively biased electrode have been investigated to develop a stably operating, high-current ion source. Ion beam characteristics such as currents and energies are measured and compared with bias currents by varying the bias voltages o ... [Rev. Sci. Instrum. 82, 123303 (2011)] published Tue Dec 20, 2011.

Influence of frequency tuning and double-frequency heating on ions extracted from an electron cyclotron resonance ion source

F. Maimone, L. Celona, R. Lang, J. Mader, J. Rossbach et al.
The electromagnetic field within the plasma chamber of an electron cyclotron resonance ion source (ECRIS) and the properties of the plasma waves affect the plasma properties and ion beam production. We have experimentally investigated the frequency tuning effect and double frequency heating on the C ... [Rev. Sci. Instrum. 82, 123302 (2011)] published Thu Dec 15, 2011.

High-precision soft x-ray polarimeter at Diamond Light Source

H. Wang, S. S. Dhesi, F. Maccherozzi, S. Cavill, E. Shepherd et al.
The development and performance of a high-precision polarimeter for the polarization analysis in the soft x-ray region is presented. This versatile, high-vacuum compatible instrument is supported on a hexapod to simplify the alignment with a resolution less than 5 [mu]rad, and can be moved with its ... [Rev. Sci. Instrum. 82, 123301 (2011)] published Thu Dec 8, 2011.

The response of CR-39 nuclear track detector to 19 MeV protons

N. Sinenian, M. J. Rosenberg, M. Manuel, S. C. McDuffee, D. T. Casey et al.
The response of CR-39 nuclear track detector (TasTrak) to protons in the energy range of 0.929.28 MeV has been studied. Previous studies of the CR-39 response to protons have been extended by examining the piece-to-piece variability in addition to the effects of etch time and etchant temperature; it ... [Rev. Sci. Instrum. 82, 103303 (2011)] published Fri Oct 28, 2011.

Efficient spin resolved spectroscopy observation machine at Hiroshima Synchrotron Radiation Center

Taichi Okuda, Koji Miyamaoto, Hirokazu Miyahara, Kenta Kuroda, Akio Kimura et al.
Highly efficient spin- and angle-resolved photoelectron spectrometer named ESPRESSO (Efficient SPin REsolved SpectroScopy Observation) machine has been developed at the beamline BL-9B in Hiroshima Synchrotron Radiation Center. Combination of high-resolution hemispherical electron analyzer and the hi ... [Rev. Sci. Instrum. 82, 103302 (2011)] published Fri Oct 21, 2011.

Detection of atomic and molecular mega-electron-volt projectiles using an x-ray charged coupled device camera

M. Chabot, G. Martinet, K. Beroff, T. Pino, S. Bouneau et al.
We show that an x-ray charge coupled device (CCD) may be used as a particle detector for atomic and molecular mega-electron-volt (MeV) projectiles of around a few hundred keV per atomic mass unit. For atomic species, spectroscopic properties in kinetic energy measurements (i.e., linearity and energy ... [Rev. Sci. Instrum. 82, 103301 (2011)] published Thu Oct 6, 2011.

Spatially resolved charge-state and current-density distributions at the extraction of an electron cyclotron resonance ion source

Lauri Panitzsch, Thies Peleikis, Michael Stalder, and Robert F. Wimmer-Schweingruber
In this paper we present our measurements of charge-state and current-density distributions performed in very close vicinity (15 mm) of the extraction of our hexapole geometry electron cyclotron resonance ion source. We achieved a relatively high spatial resolution reducing the aperture of our 3D-mo ... [Rev. Sci. Instrum. 82, 093302 (2011)] published Mon Sep 26, 2011.

K-shell emission x-ray imaging of z-pinch plasmas with a pinhole and a logarithmic spiral crystal

Qingguo Yang, Zeren Li, Qixian Peng, Libing Yang, Guanhua Chen et al.
An in-chamber, mini x-ray imaging instrument employs a pinhole and a logarithmic spiral crystal has been developed for obtaining K-shell line images of the imploding aluminum wire array on the Yang accelerator. The logarithmic spiral crystal acts as a monochromator and a non-dispersive mirror that r ... [Rev. Sci. Instrum. 82, 093301 (2011)] published Mon Sep 12, 2011.

A solid-state Marx generator driven Einzel lens chopper

T. Adachi, T. Arai, K. W. Leo, K. Takayama, and A. Tokuchi
A new type of pulse chopper called an Einzel lens chopper is described. An Einzel lens placed immediately after an electron cyclotron resonance ion source is driven by high-voltage pulses generated by a newly developed solid-state Marx generator. A rectangular negative barrier pulse-voltage is contr ... [Rev. Sci. Instrum. 82, 083305 (2011)] published Wed Aug 31, 2011.

Profiling of barrier capacitance and spreading resistance using a transient linearly increasing voltage technique

E. Gaubas, T. Ceponis, and J. Kusakovskij
A technique for the combined measurement of barrier capacitance and spreading resistance profiles using a linearly increasing voltage pulse is presented. The technique is based on the measurement and analysis of current transients, due to the barrier and diffusion capacitance, and the spreading resi ... [Rev. Sci. Instrum. 82, 083304 (2011)] published Wed Aug 24, 2011.

A Thomson parabola ion imaging spectrometer designed to probe relativistic intensity ionization dynamics of nanoclusters

R. Rajeev, K. P. M. Rishad, T. Madhu Trivikram, V. Narayanan, and M. Krishnamurthy
Conventional techniques of probing ionization dynamics at relativistic intensities for extended target systems such as clusters are difficult both due to problems of achieving good charge resolution and signal integration over the focal volume. Simultaneous measurement of arrival time, necessary for ... [Rev. Sci. Instrum. 82, 083303 (2011)] published Mon Aug 22, 2011.

An ultra-low energy (30200 eV) ion-atomic beam source for ion-beam-assisted deposition in ultrahigh vacuum

Jindrich Mach, Tomas Samoril, Stanislav Voborny, Miroslav Kolibal, Jakub Zlamal et al.
The paper describes the design and construction of an ion-atomic beam source with an optimized generation of ions for ion-beam-assisted deposition under ultrahigh vacuum (UHV) conditions. The source combines an effusion cell and an electron impact ion source and produces ion beams with ultra-low ene ... [Rev. Sci. Instrum. 82, 083302 (2011)] published Mon Aug 15, 2011.