Rotational Raman scattering of hydrogen for calibrating a Thomson scattering device

Toshihiko Yamauchi; Ichiro Yanagisawa

doi:10.1364/AO.24.000700

Applied Optics
Vol. 24,
Issue 5,
pp. 700-709
(1985)
•https://doi.org/10.1364/AO.24.000700

Rotational Raman scattering of hydrogen for calibrating a Thomson scattering device

Toshihiko Yamauchi and Ichiro Yanagisawa

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Toshihiko Yamauchi and Ichiro Yanagisawa, "Rotational Raman scattering of hydrogen for calibrating a Thomson scattering device," Appl. Opt. 24, 700-709 (1985)

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Abstract

The anti-Stokes rotational Raman scattering from hydrogen gas (60–200 Torr at 293 K) is used to calibrate the intensity of the Thomson scattered signal from the JFT-2M tokamak plasma by the incidence of ruby laser light. The normalized sensitivities as well as the Raman constant are obtained by the Raman scattering experiment. The electron temperature and density profiles are calculated with the calibration constant obtained by the Raman scattered light and the LED light; the error of electron density depends on the uncertainty of the differential Raman cross section of hydrogen gas, the gas filling density, the electron temperature, and the photoelectron statistics.

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	Raman line(Å)	n	J	Δν(cm⁻¹)	γ 00(cm³)	σ 0(cm²)	n_H2(J)/N_H2	Bo(cm⁻¹)	F	I	g_J

A	6776	0	2 → 0	354.6	0.353·10⁻²⁴	3.43·10⁻³⁰	0.114	59.3	6.89	1/2	1
A	6671	0	3 → l	587.3	0.373·10⁻²⁴	5.24·10⁻³⁰	0.082	59.3	6.89	1/2	3

B	6776	0	2 → 0	354.6	0.314·10⁻²⁴	2.71·10⁻³⁰	0.114	59.3	6.89	1/2	1
B	6671	0	3 → 1	587.3	0.314·10⁻²⁴	3.71·10⁻³⁰	0.082	59.3	6.89	1/2	3

							(at 293 K)

SENSITIVITY

Position	θ(degrees)	1^st CH.	2^nd CH.	3^rd CH.	4^th CH.

1^st	80	1	1.04	1.72	3.17
2^nd	84	1	1.29	1.17	1.66
3^rd	88	1	1.78	1.11	1.11
4^th	92	1	0.88	0.99	1.57
5^th	96	1	1.32	1.42	1.51
6^th	100	1	0.80	0.73

COUNTS/PHOTOELECTRON

Position	θ(degrees)	1^st CH.	2^nd CH.	3^rd CH.	4^th CH.

1^st	80	1.7	1.5	3.6	4.7
2^nd	84	1.8	2.0	2.5	3.0
3^rd	88	1.9	2.0	2.3	2.6
4^th	92	1.9	1.5	2.0	4.7
5^th	96	1.2	1.5	1.6	2.1
6^th	100	2.3	3.0	2.2

Position	C_R,θ (cm³)
1^st	1.98 · 10⁻¹³
2^nd	1.68 · 10⁻¹³
3^rd	1.78 · 10⁻¹³
4^th	1.93 · 10⁻¹³
5^tt	1.48 · 10⁻¹³
6^th	3.44 · 10⁻¹³

	Raman line(Å)	n	J	Δν(cm⁻¹)	γ 00(cm³)	σ 0(cm²)	n_H2(J)/N_H2	Bo(cm⁻¹)	F	I	g_J

A	6776	0	2 → 0	354.6	0.353·10⁻²⁴	3.43·10⁻³⁰	0.114	59.3	6.89	1/2	1
A	6671	0	3 → l	587.3	0.373·10⁻²⁴	5.24·10⁻³⁰	0.082	59.3	6.89	1/2	3

B	6776	0	2 → 0	354.6	0.314·10⁻²⁴	2.71·10⁻³⁰	0.114	59.3	6.89	1/2	1
B	6671	0	3 → 1	587.3	0.314·10⁻²⁴	3.71·10⁻³⁰	0.082	59.3	6.89	1/2	3

							(at 293 K)

SENSITIVITY

Position	θ(degrees)	1^st CH.	2^nd CH.	3^rd CH.	4^th CH.

1^st	80	1	1.04	1.72	3.17
2^nd	84	1	1.29	1.17	1.66
3^rd	88	1	1.78	1.11	1.11
4^th	92	1	0.88	0.99	1.57
5^th	96	1	1.32	1.42	1.51
6^th	100	1	0.80	0.73

COUNTS/PHOTOELECTRON

Position	θ(degrees)	1^st CH.	2^nd CH.	3^rd CH.	4^th CH.

1^st	80	1.7	1.5	3.6	4.7
2^nd	84	1.8	2.0	2.5	3.0
3^rd	88	1.9	2.0	2.3	2.6
4^th	92	1.9	1.5	2.0	4.7
5^th	96	1.2	1.5	1.6	2.1
6^th	100	2.3	3.0	2.2

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Applied Optics