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Measurements of the fast ion slowing-down times in the HL-2A tokamak and comparison to classical theory
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10.1063/1.4768425
/content/aip/journal/pop/19/11/10.1063/1.4768425
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/11/10.1063/1.4768425

Figures

Image of FIG. 1.
FIG. 1.

The fraction of each neutron type during NBI in the HL-2A tokamak obtained by using the TRANSP transport code. The code run assumes that the NBI power is 0.8 MW and the beam voltage is 38 keV, and the full and half energy fraction are 51% and 30%, respectively.

Image of FIG. 2.
FIG. 2.

Arrangement of the NBI system and the 235U fission chamber on the HL-2A. and are oriented to be clockwise and counter-clockwise, respectively, as seen from the top. The fast ions are injected into the target plasma at an angle of 32° with respect to the plasma current at the magnetic axis. The fission chamber is placed about 1.5 m away from the diagnostic port at the equatorial plane of the outboard side of the HL-2A tokamak.

Image of FIG. 3.
FIG. 3.

The schematic diagram of the electronic circuits used for the fission chamber. Note that currently the FC system is operated in the pulse counting mode.

Image of FIG. 4.
FIG. 4.

Time evolutions of the neutron emission rate when a deuterium beam blip is injected into the MHD-quiescent plasma with and without ECRH. The plasma current (150 kA), line-averaged electron density (1.0 × 1019 m−3) and toroidal magnetic field (1.3 T) are approximately identical for the both plasmas. The only difference in these two discharges is the electron temperature: one is 0.9 keV, the other is 1.6 keV. The red shaded area indicates the time interval in which NB blip is applied.

Image of FIG. 5.
FIG. 5.

Fusion reactivity on D(d,n)3He as a function of deuterium energy for the HL-2A background plasmas with ion temperature  = 1.0 keV. The red arrow indicates the position of the beam injection energy in HL-2A.

Image of FIG. 6.
FIG. 6.

Time evolutions of the neutron emission rate when the deuterium beam blip is injected into the MHD-quiescent ECRH plasma with different electron density. The plasma current (150 kA), electron temperature (1.6 keV), and toroidal magnetic field (1.3 T) are approximately identical for the both plasmas. The only difference in these two discharges is the electron density: one is 1.0 × 1019 m−3, the other is 1.5 × 1019 m−3. The red shaded area indicates the time interval in which NB blip is applied.

Image of FIG. 7.
FIG. 7.

E-folding neutron emission decay time as a function of line-averaged electron density in plasma with and without ECRH. The electron temperatures in plasma with and without ECRH are 1.6 keV and 0.9 keV, respectively. The statistic trend of the vs. in plasma with different is well consistent with the expected scenarios.

Image of FIG. 8.
FIG. 8.

Radial profiles of the electron temperature, electron density, and the e-folding decay time of the D-D neutron emission rate as a function of the normalized minor radius r/a for discharge No. 17425 without ECRH. The profiles of the temperature and density at  = 645 ms is shown. was predicted by the classical slowing-down model. The dashed line in (c) indicates the experimentally measured neutron decay time .

Image of FIG. 9.
FIG. 9.

Radial profiles of the electron temperature, electron density, and the e-folding decay time of the D-D neutron emission rate as a function of the normalized minor radius r/a for discharge No. 17416 with ECRH. The profiles of the temperature and density at  = 635 ms is shown. was predicted by the classical slowing-down model. The dashed line in (c) indicates the experimentally measured neutron decay time .

Tables

Generic image for table
Table I.

Main parameters in the fast ion slowing-down experiment.

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/content/aip/journal/pop/19/11/10.1063/1.4768425
2012-11-26
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Measurements of the fast ion slowing-down times in the HL-2A tokamak and comparison to classical theory
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/11/10.1063/1.4768425
10.1063/1.4768425
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