Laser measurement of the photodetachment cross section of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mo>−</mml:mo></mml:msup></mml:math>at the wavelength 1064 nm

Vandevraye, Mickael; Babilotte, Philippe; Drag, Cyril; Blondel, Christophe

doi:10.1103/physreva.90.013411

Cited by 22 publications

(39 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first laser studies arose with the need to diagnose controlled fusion plasmas, and confirmed the order of magnitude of the cross section [20,21]. Recently, Vandevraye et al [22] carried out a new measurement at the Nd:YAG laser wavelength, 1064 nm. Their result, 4.5(6)xl0~21 m2, lies 1.5 a above the value of 3.5-3.6 x 10-21 m2 obtained by most theoretical studies.…”

Section: Introductionmentioning

confidence: 97%

Animated-beam measurement of the photodetachment cross section ofH−

Génévriez

Urbain

2015

Phys. Rev. A

View full text Add to dashboard Cite

The photodetachment cross section of H~ was measured using the animated-crossed-beam technique in the 700-to 1064-nm range. The laser beam was repeatedly swept across the ion beam by tilting a fused silica plate in order to eliminate the need for beam profile measurements. After integration of the signal, the cross section was expressed in terms of easily measurable quantities, e.g., the laser power and the ion beam current. The present results are in excellent agreement with previous experiments and compelling theoretical works.

show abstract

Section: Introductionmentioning

confidence: 97%

Animated-beam measurement of the photodetachment cross section ofH−

Génévriez

Urbain

2015

Phys. Rev. A

View full text Add to dashboard Cite

show abstract

“…2) is true for the usual photodetachment experiments performed [14], considering a typical waist w 0 % 70 lm, L 2R A À % 2 mm (typical case of a %1 nA H À ion beam), for a typical laser beam at 1064 nm for instance (20 Hz, laser pulse width s % 30 ns), inducing z R % 14 mm ) L % 2 mm, and considering no particular diffraction phenomenum of the laser beam.…”

Section: Introductionmentioning

confidence: 96%

“…Another possible option is the photoneutralization process [12,14,15] that can be seen as an attractive alternative [16], as no gas is injected into the medium to neutralize the negative ions (less parasitic particles produced, no plasma formation in the cell). The neutralization rate is estimated around 95%, [17], enhancing in this case the electrical efficiency of the heating system up to 60% [16].…”

Section: Introductionmentioning

confidence: 99%

“…For all these photoneutralization processes, it requires to have reliable absolute photo-detachment cross-section r values, as this parameter is used afterwards in the different numerical models, for instance, in the Space Charge Models (SCM) [19]. Mathematical models, behaviour laws and physics development in the photodetachment processes [12,14,20] are also greatly required. Into the present work, benchmark calculations are then given concerning the determination of the absolute crosssection r into a photo-neutralization process, considering the overlap between a laser beam and a negative ion beam.…”

Section: Introductionmentioning

confidence: 99%

“…1), a single-mode high power (continuous or pulsed) laser beam is used to irradiate a negative ion particle beam, to avoid a possible ''bar-code'' interaction effect potentially induced by the use of a multimode laser (irregular temporal profile) [14,27,43].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photodetachment cross-section evaluation using asymptotic considerations

Babilotte

Vandevraye

2017

J Theor Appl Phys

Self Cite

View full text Add to dashboard Cite

Mathematical calculations are given concerning the evaluation of the negative ions photodetachment crosssection r, into a so-called saturation regime. The interaction between a negative ion particle beam and a laser beam is examined under theoretical aspects. A quantitative criterion S is proposed to define the saturation threshold between the linear and the saturated domains, which are both present in this saturation regime. The asymptotic behaviours extracted at the low and high energy limits are used to determine this threshold quantitative criterion S and to evaluate also the photodetachment cross-section r. The case of a symmetric gaussian photodetachment laser beam shape is examined according to the proposed formalism, which can be used either for the photo-detachment or photo-ionization processes, and could be potentially used into technological solutions for negative ion neutralisation processes (such as neutral beam injector) in the future fusion energy devices. Estimations onto the errors related to the use of this methodology are given.

show abstract

New method for highly accurate calculations of the photodetachment cross-sections of the negatively charged hydrogen ions

Frolov

2015

Chemical Physics Letters

View full text Add to dashboard Cite

New approach to highly accurate calculations of the photodetachment cross-sections of the negatively charged hydrogen ions is developed. This effective, fast and numerically stable method is based on the use of the Rayleigh's formula for the spherical Bessel functions. Photodetachment cross-sections of the negatively charged hydrogen ion(sand 3 H − (tritium T − ) are determined with the use of highly accurate, truly correlated, variational wave functions constructed for these ions. Our method allows one to investigate the problem of photodetachment of the negatively charged hydrogen ions completely, i.e. without any limitation by numerical values of the photo-electron momentum p

show abstract

Laser measurement of the photodetachment cross section ofH−at the wavelength 1064 nm

Cited by 22 publications

References 55 publications

Animated-beam measurement of the photodetachment cross section ofH−

Animated-beam measurement of the photodetachment cross section ofH−

Photodetachment cross-section evaluation using asymptotic considerations

New method for highly accurate calculations of the photodetachment cross-sections of the negatively charged hydrogen ions

Contact Info

Product

Resources

About