Atomic data for controlled fusion research

Barnett, C. F.; Ray, J. A.; Ricci, E.; Wilker, M.I.; McDaniel, E. W.; Thomas, E.W.; Gilbody, H B

doi:10.2172/7115865

Cited by 80 publications

(103 citation statements)

References 0 publications

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“…However, when we plot the cross section as a function of energy -• (Figure 8), we see a definite 1/v 2 dependence. This is indicative of a charge-transfer process in the lower energy regime (<400 keV) as shown in several impact parameter calculations Saha, 1979, 1981;Sural and Sil, 1965;Schultz and Olsen, 1988] and also by experimental data from atomic collisions [Barnett, 1977]. As mentioned in Section 1, there are no calculations or data on the proton-SO2 collision system, so we must rely on atomic collision data and calculations as a guide in this energy regime changed, and/or a mechanism is needed to accelerate the electrons to energies on the order of 100 eV.…”

Section: Resultssupporting

confidence: 60%

Proton impact excitation of SO₂

Kiehling¹,

Ammirati²,

Moore³

et al. 2001

J. Geophys. Res.

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These results indicate that perhaps protons play a larger role in the torus than was previously thought. Since a review of the literature and databases shows no measured photon emission cross sections for protons colliding with SO2, we have initiated a determination of these cross sections. We present here spectra and preliminary cross section data for proton-SO2 collisions over a range of proton energies from 50 to 250 keV. This range of energies dominates the proton energy flux. Experimental Details General DescriptionMore information on the general nature of the experimental techniques employed by this laboratory can be found in previous publications [Monce, 1988[Monce, , 1990Freeman et al., 1992]. However, as this is the first publication utilizing a CCDspectrometer system for detection of the photons, we will describe the procedure in greater detail.The The target gas cell is aligned along the beam path with an adjustable viewing slit along this length. The target gas enters the cell through a tube in the top. A tube at the bottom is connected to a capacitance manometer for pressure measurement. The gas pressure is regulated with a precision needle valve. Also in the target gas cell is a thermistor for temperature measurement. The thermistor was calibrated using a 0.1øC mercury thermometer.The photons emitted 90 ø to the beam path are collected and 26,147

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Section: Resultssupporting

confidence: 60%

Proton impact excitation of SO₂

Kiehling¹,

Ammirati²,

Moore³

et al. 2001

J. Geophys. Res.

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show abstract

“…Consequently, CRDS is not capable of specifically space-resolved measurements, in contrast to laser photodetachment. Apart from the intrinsic uncertainties of the measured decay times and the required value of the photodetachment cross section [9], no additional errors can influence the measurement, as CRDS requires no further plasma parameters to obtain n H − .…”

Section: Cavity Ring-down Spectroscopymentioning

confidence: 99%

Comparison of measured and modelled negative hydrogen ion densities at the ECR-discharge HOMER

Rauner

Kurutz

Fantz

2015

AIP Conference Proceedings

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“…The signal to be detected is the laser light escaping from one end of the optical cavity. The cross section of photodetachment process for H -presents a broad peak centred at 800 nm [12], for this reason a YAG (Yttrium Aluminium Garnet) laser at 1064 nm has been chosen. After having considered the stability conditions of the optical cavity and the mechanical constraints related to the shape of the source, the length of the cavity was set to 0.75 m, whereas the radius of curvature of the mirrors was set to 6 m. According to the manufacturer's specifications (Los Gatos -CRD optics), the reflectivity, R, of the mirrors should be comprised between R min =99.990% and R max =99.997%, therefore in absence of an absorbing medium the temporal decay 0 respectively.…”

Section: Cavity Ring Down Spectroscopymentioning

confidence: 99%