Laser scattering on low temperature plasmas : high resolution and stray light rejection

Sande, MJ Marco van de; de, van

doi:10.6100/ir554040

Cited by 10 publications

(13 citation statements)

References 93 publications

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“…where the differential cross section for nitrogen at 532 nm is 𝑑𝜎 𝑅 /𝑑Ω = 6.07•10 −32 𝑚 2 for scattering perpendicular to the probe beam [19]. Using a 100 μm input slit, we measured (4.7 ± 0.2) •10 4 total counts at 10 mJ and 750 torr, corresponding to 𝑘 = (3.13 ± 0.14) • 10 12 𝑐𝑚 −1 .…”

Section: Jinst 16 P08045mentioning

confidence: 99%

“…Only transitions 𝐽 → 𝐽 + 2 (Stokes) and 𝐽 → 𝐽 − 2 (anti-Stokes) are allowed, where the integer 𝐽 is the rotational quantum number. In the following we will review the analytical expressions needed to fit the rotational Raman spectrum as described in more detail elsewhere [19][20][21]. The wavelength of the red-shifted Stokes Raman lines may be approximated by…”

Section: Jinst 16 P08045mentioning

confidence: 99%

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Silica Raman scattering probe for absolute calibration of Thomson scattering spectrometers

Ghazaryan¹,

Kaloyan²,

Niemann³

2021

J. Inst.

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A: We have developed a solid state probe for an absolute irradiance calibration of the Thomson scattering system on the Large Plasma Device (LAPD), based on Raman scattering off silica. Measurements performed with a triple-grating spectrometer have investigated the intensities of a pulsed laser beam Raman scattered off crystalline and amorphous silica over a range of temperatures of relevance to the LAPD (299-498 K). The data were compared with Rayleigh and Raman scattering intensities in gaseous nitrogen. The measurements show that Raman scattering off quartz allows rapid and accurate alignment and calibration of Thomson scattering systems in plasma physics experiments that cannot be calibrated using conventional methods. K: Plasma diagnostics -charged-particle spectroscopy; Plasma diagnostics -probes; Plasma generation (laser-produced, RF, x ray-produced)

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Section: Jinst 16 P08045mentioning

confidence: 99%

Section: Jinst 16 P08045mentioning

confidence: 99%

Silica Raman scattering probe for absolute calibration of Thomson scattering spectrometers

Ghazaryan¹,

Kaloyan²,

Niemann³

2021

J. Inst.

View full text Add to dashboard Cite

show abstract

“…where the differential cross section for nitrogen at 532 nm is 𝑑𝜎 𝑅 /𝑑Ω = 6.07•10 −32 𝑚 2 for scattering perpendicular to the probe beam [19]. Using a 100 𝜇m input slit, we measured (4.7 ± 0.2) •10 4 total counts at 10 mJ and 750 torr, corresponding to 𝑘 = (3.13 ± 0.14) • 10 12 𝑐𝑚 −1 .…”

Section: Absolute Spectrometer Calibrationmentioning

confidence: 99%

“…The statistical weight factor causes the alternating amplitudes of adjacent transition lines. The differential cross section of an individual transition 𝑑𝜎 𝐽 →𝐽 /𝑑Ω depends on the Placzek-Teller coefficients, and the polarizability anisotropy, which stems from measurements [20] and was interpolated at 532 nm [19]. The cross section varies with wavelength as shown in figure 3c around a weighted average of 3.8•10 −34 𝑚 2 .…”

Section: Absolute Spectrometer Calibrationmentioning

confidence: 99%

Silica Raman scattering probe for absolute calibration of Thomson scattering spectrometers

Ghazaryan,

Kaloyan,

Niemann

2021

Preprint

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A: We have developed a solid state probe for an absolute irradiance calibration of the Thomson scattering system on the Large Plasma Device (LAPD), based on Raman scattering off silica. Measurements performed with a triple-grating spectrometer have investigated the intensities of a pulsed laser beam Raman scattered off crystalline and amorphous silica over a range of temperatures of relevance to the LAPD (299 -498 K). The data were compared with Rayleigh and Raman scattering intensities in gaseous nitrogen. The measurements show that Raman scattering off quartz allows rapid and accurate alignment and calibration of Thomson scattering systems in plasma physics experiments that cannot be calibrated using conventional methods.

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“…At these late times, the LPP expands to much larger scales of centimeters 6 to meters 7 , while its density and temperature drop significantly. In order to apply TS in these plasmas, one has to overcome challenges associated with the small scattering cross section, similar to those encountered when scattering off magnetic confinement fusion plasmas 8 or low temperature plasmas 9 . These include the need for stray light mitigation using a notch filter, an absolute irradiance calibration of the detection branch, and photon averaging over hundreds of laser shots.…”

Section: Introductionmentioning

confidence: 99%

Raster Thomson scattering in large-scale laser plasmas produced at high repetition rate

Kaloyan,

Ghazaryan,

Constantin

et al. 2021

Preprint

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We present optical Thomson scattering measurements of electron density and temperature in a large-scale (∼ 2 cm) exploding laser plasma produced by irradiating a solid target with a high energy (5-10 J) laser pulse at high repetition rate (1 Hz). The Thomson scattering diagnostic matches this high repetition rate. Unlike previous work performed in single shots at much higher energies, the instrument allows point measurements anywhere inside the plasma by automatically translating the scattering volume using motorized stages as the experiment is repeated at 1 Hz. Measured densities around 4×10 16 cm −3 and temperatures around 7 eV result in a scattering parameter near unity, depending on the distance from the target. The measured spectra show the transition from collective scattering close to the target to non-collective scattering at larger distances. Densities obtained by fitting the weakly collective spectra agree to within 10% with an irradiance calibration performed via Raman scattering in nitrogen.

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Laser scattering on low temperature plasmas : high resolution and stray light rejection

Cited by 10 publications

References 93 publications

Silica Raman scattering probe for absolute calibration of Thomson scattering spectrometers

Silica Raman scattering probe for absolute calibration of Thomson scattering spectrometers

Silica Raman scattering probe for absolute calibration of Thomson scattering spectrometers

Raster Thomson scattering in large-scale laser plasmas produced at high repetition rate

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