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Core-ion temperature measurement of the ADITYA tokamak using passive charge exchange neutral particle energy analyzer
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10.1063/1.4791998
/content/aip/journal/rsi/84/2/10.1063/1.4791998
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/2/10.1063/1.4791998

Figures

Image of FIG. 1.
FIG. 1.

Calculated CX-neutral energy spectrum for ADITYA tokamak. The results have been obtained analytically using the slab-model assumption for ohmic plasma's circular cross section.

Image of FIG. 2.
FIG. 2.

Schematic layout of the ADITYA charge exchange NPA.

Image of FIG. 3.
FIG. 3.

Schematic layout of the CX-NPA and its photograph. Components inside CX-NPA are (1) stripping cell, (2) analyzer box, (3) pressure gauge, (4) positive plate (PP), (5) exit aperture at PP (straight channel), (6) alignment window, (7) electrical feedthrough, (8) grounded plate (GP), (9) entrance aperture, (10) exit apertures at GP (energy channels), (11) CEM-detector, (12) guard rings.

Image of FIG. 4.
FIG. 4.

(a) Stripping efficiency as a function of neutral energy (E) in eV. (b) Stripping cell efficiency as a function of H2 gas pressure in mtorr. [Refer to Eq. (13) .]

Image of FIG. 5.
FIG. 5.

Different count peaks correspond to different analyzer plate voltage Vp and H+ beam energy for channel-2.

Image of FIG. 6.
FIG. 6.

CX-NPA calibration curve analyzer plate voltage (Vp) vs detected energy (E) for three different channels. [Refer to Eq. (3) .]

Image of FIG. 7.
FIG. 7.

CEM photon detection efficiency with wavelength. 29

Image of FIG. 8.
FIG. 8.

Side view of the CX-NPA after modifications made for the UV suppression.

Image of FIG. 9.
FIG. 9.

Deuterium lamp's spectrum used to test the UV rejection capabilities of the upgraded ACX-NPA.

Image of FIG. 10.
FIG. 10.

The illustration of charge exchange neutrals generated signals at CEM after filling up hydrogen gas at 5 mTorr in the stripping cell.

Image of FIG. 11.
FIG. 11.

Plot shows CX-neutral counts at three different energy channels with time.

Image of FIG. 12.
FIG. 12.

Plot of lnF vs counts at various energy channels for plasma discharge #21 743 after 60 ms of discharge initiation. [Refer to Eq. (10) .]

Image of FIG. 13.
FIG. 13.

For plasma dischare #21 743: (a) Plot shows evolution of plasma current with time; (b) Plot shows temporal variation of central ion temperature T i (0) during flat top of the current profile.

Image of FIG. 14.
FIG. 14.

Plot shows temporal variation of central electron temperature T e (0) and central ion temperature T i (0) for plasma discharge #22 738.

Tables

Generic image for table
Table I.

Table of the three energy channels and corresponding energy resolutions.

Generic image for table
Table II.

The suppression of VUV photons as seen on Channel-3 after the incorporation of additional components in the ACXD System.

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/content/aip/journal/rsi/84/2/10.1063/1.4791998
2013-02-20
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Core-ion temperature measurement of the ADITYA tokamak using passive charge exchange neutral particle energy analyzer
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/2/10.1063/1.4791998
10.1063/1.4791998
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