• 検索結果がありません。

Electron temperature and density profiles have been measured in the CHS ICRF heating experiments by a single channel ruby-laser Thomson scattering.

N/A
N/A
Protected

Academic year: 2021

シェア "Electron temperature and density profiles have been measured in the CHS ICRF heating experiments by a single channel ruby-laser Thomson scattering. "

Copied!
1
0
0

読み込み中.... (全文を見る)

全文

(1)

§62. Electron Density and Temperature Profiles of ICRF Heated Plasma in CHS

Yamada, 1., Iguchi, H., Kumazawa, R., Nishimura, K., Masuda, S.

Electron temperature and density profiles have been measured in the CHS ICRF heating experiments by a single channel ruby-laser Thomson scattering.

In the course of ICRF experiments, four P- and one U -antennas have been installed to CHS.

In the experiments, boronization onto the wall of the vacuum vessel of CHS has been carried out for the suppression of the radiation loss due to impurity ions [ 1] . Profile measurements of the ICRF heated plasmas have been made at Br=1.7 T and Rax=92.1 em both before and after boronization.

Fig.l shows the measured electron temperature and density profiles. The upper left-side three and right-side four cases are the results before and after the boronization, respectively. The legend means the used antenna and total radiated power in MW. In the experiments in which both P- and U -antennas are used after boronization, more peaked temperature and hollow density profiles have been observed. In addition, the temperature at the plasma center has been increased by about 1.5-2 times after boronization. Low and high density discharge experiments have been done after boronization (PU0.6L and PU0.6H in the figure legend, respectively). In both cases, total radiated power of 0.6 MW are introduced from the P- and U-antennas. The electron temperature of the high density plasma is lower than that in low density discharge, resulting in nearly same profiles of the plasma pressure. According to the similar pressure profiles, the stored energy of about 2.2 kJ are obtained in both cases. Since the radiation loss has been significantly reduced, good plasma performances have been achieved in the experiments after boronization . The hollow density profiles which have been observed in NBI heated plasmas after boronization are thought to be due to the reduction of radiation loss at the outer and edge regions.

We have installed a new Y AG Thomson scattering. Further information on the temperature and density profiles observed in the experiments will be obtained by the new Thomson scattering.

..-.

'?

E

(.)

C")

0 ,... ._..

z

CHSICRF

--X-- P005

0

-

+- -

PUl.O ----t:.- -PUOo6L

- 0

- - PUOo6H ·

400

200

o ...

l.o.A. ... I.o.A. ... ...

90 95 100 105 110

R (em)

CHSICRF

--X-- POo5

- - +- -

PUl.O

8

- - PUOo6L

-•-- PUOo6H

6

4

Cll

2

0 ...

~

...

~

...

~~~~~

90 95 100 105 110

R (em)

Fig.l. Electron temperature and density profiles of the ICRF heated plasmas in CHS. The left-side three and right-side four cases are the results before and after boronization, respectively.

Reference

1) Yamada, H. et al., J. Jpn. Appl. Phys. 33 (1994)

L1638. --

67

参照

関連したドキュメント

At first, experiments of indenting vertically the fingertip pulp by a probe and tabs of the aluminum beverage can ends have been done to observe force responses and feelings in

In deformation changes including step-like discontinuities, techniques using a laser beam of single wavelength cannot measure the deformation amounts.. Because the deformation

Standard domino tableaux have already been considered by many authors [33], [6], [34], [8], [1], but, to the best of our knowledge, the expression of the

(In a very recent preprint, Niethammer and Vel´azquez [9] have obtained a remarkable estimate for the effective potential of a single particle in the supercritical case by taking

We present sufficient conditions for the existence of solutions to Neu- mann and periodic boundary-value problems for some class of quasilinear ordinary differential equations.. We

As an application, we present in section 4 a new result of existence of periodic solutions to such FDI that is a continuation of our recent work on periodic solutions for

Merle; Global wellposedness, scattering and blow up for the energy critical, focusing, nonlinear Schr¨ odinger equation in the radial case, Invent.. Strauss; Time decay for

Then it follows immediately from a suitable version of “Hensel’s Lemma” [cf., e.g., the argument of [4], Lemma 2.1] that S may be obtained, as the notation suggests, as the m A