Helium transport in enhanced confinement regimes on the TEXTOR and DIII-D tokamaks

D. L. Hillis; J. T. Hogan; K. H. Finken; W. P. West; R. R. Weynants; M. R. Wade; K. Akaishi; W. Y. Baek; J. Boedo; K. H. Burrell; R. W. Conn; K. H. Dippel; R. Doerner; H. Euringer; D. Finkenthal; D. S. Gray; C. M. Greenfield; P. Gohil; R. J. Groebner; J. Kim; C. C. Klepper; A. M. Messiaen; P. K. Mioduszewski; A. Miyahara; R. Moyer; G. Van Oost; A. Pospieszcyk; D. Reiter; D. Rusbüldt; R. P. Seraydarian; R. Van Nieuwenhove; G. H. Wolf

doi:10.1016/S0022-3115(06)80009-7

Helium transport in enhanced confinement regimes on the TEXTOR and DIII-D tokamaks

D. L. Hillis, J. T. Hogan, K. H. Finken, W. P. West, R. R. Weynants, M. R. Wade, K. Akaishi, W. Y. Baek, J. Boedo, K. H. Burrell, R. W. Conn, K. H. Dippel, R. Doerner, H. Euringer, D. Finkenthal, D. S. Gray, C. M. Greenfield, P. Gohil, R. J. Groebner, J. KimC. C. Klepper, A. M. Messiaen, P. K. Mioduszewski, A. Miyahara, R. Moyer, G. Van Oost, A. Pospieszcyk, D. Reiter, D. Rusbüldt, R. P. Seraydarian, R. Van Nieuwenhove, G. H. Wolf

Diagnostics and Control

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Abstract

Comparisons of helium (He) transport and exhaust in L-mode and in an enhanced confinement regime (H-mode), which is induced by a polarizing electrode, have been made for the TEXTOR tokamak. The results show an increased tendency for He accumulation when bulk plasma energy and particle confinement are improved during the polarization-induced H-mode. Since these results imply that a high He pumping efficency may be necessary for H-mode burning plasmas, we have begun exploring He transport in a divertor H-mode, similar to that proposed for the international thermonuclear experimental reactor (ITER). A collaborative program has been initiated to measure He transport and scaling on DIII-D during L-mode, H-mode, and ELMing H-mode plasma conditions. To simulate the presence of He ash in DIII-D, a 25 ms He puff is injected into a DIII-D plasma, resulting in a He concentration of ≈5%. The time dependence of the He²⁺ density profiles in the plasma core is measured by charge-exchange recombination spectroscopy at 11 radial locations.

Original language	English
Pages (from-to)	35-44
Number of pages	10
Journal	Journal of Nuclear Materials
Volume	196-198
Issue number	C
DOIs	https://doi.org/10.1016/S0022-3115(06)80009-7
State	Published - Dec 1 1992

Funding

For future steady-state tokamaks, such as the international thermonuclear experimental reactor (ITER), continuous purging of the helium (He) ash is essential. Estimates \[1\]s how that newly created He ions must be removed within 7 to 15 energy confinement times to maintain continuous reactor operation (r~e/r E < 7- 15). Recent measurements \[2-6\] on TEXTOR and other tokamaks demonstrate that He can be readily transported from the plasma core during L-mode plasma discharges. TEXTOR experiments use the advanced limiter test-II (ALT-II) system, a toroidal belt * Research sponsored in part by the Office of Fusion Energy, US Department of Energy, under contract DE-AC06-84OR21400 with Martin Marietta Energy Systems, Inc., and by the US Department of Energy under contract DE-AC03-89ER51114.

Funders	Funder number
US Department of Energy	DE-AC03-89ER51114, DE-AC06-84OR21400
Fusion for Energy

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Hillis, D. L., Hogan, J. T., Finken, K. H., West, W. P., Weynants, R. R., Wade, M. R., Akaishi, K., Baek, W. Y., Boedo, J., Burrell, K. H., Conn, R. W., Dippel, K. H., Doerner, R., Euringer, H., Finkenthal, D., Gray, D. S., Greenfield, C. M., Gohil, P., Groebner, R. J., ... Wolf, G. H. (1992). Helium transport in enhanced confinement regimes on the TEXTOR and DIII-D tokamaks. Journal of Nuclear Materials, 196-198(C), 35-44. https://doi.org/10.1016/S0022-3115(06)80009-7

@article{a3803cfa1738498495f28f745545bcf6,

title = "Helium transport in enhanced confinement regimes on the TEXTOR and DIII-D tokamaks",

abstract = "Comparisons of helium (He) transport and exhaust in L-mode and in an enhanced confinement regime (H-mode), which is induced by a polarizing electrode, have been made for the TEXTOR tokamak. The results show an increased tendency for He accumulation when bulk plasma energy and particle confinement are improved during the polarization-induced H-mode. Since these results imply that a high He pumping efficency may be necessary for H-mode burning plasmas, we have begun exploring He transport in a divertor H-mode, similar to that proposed for the international thermonuclear experimental reactor (ITER). A collaborative program has been initiated to measure He transport and scaling on DIII-D during L-mode, H-mode, and ELMing H-mode plasma conditions. To simulate the presence of He ash in DIII-D, a 25 ms He puff is injected into a DIII-D plasma, resulting in a He concentration of ≈5%. The time dependence of the He2+ density profiles in the plasma core is measured by charge-exchange recombination spectroscopy at 11 radial locations.",

author = "Hillis, {D. L.} and Hogan, {J. T.} and Finken, {K. H.} and West, {W. P.} and Weynants, {R. R.} and Wade, {M. R.} and K. Akaishi and Baek, {W. Y.} and J. Boedo and Burrell, {K. H.} and Conn, {R. W.} and Dippel, {K. H.} and R. Doerner and H. Euringer and D. Finkenthal and Gray, {D. S.} and Greenfield, {C. M.} and P. Gohil and Groebner, {R. J.} and J. Kim and Klepper, {C. C.} and Messiaen, {A. M.} and Mioduszewski, {P. K.} and A. Miyahara and R. Moyer and {Van Oost}, G. and A. Pospieszcyk and D. Reiter and D. Rusb{\"u}ldt and Seraydarian, {R. P.} and {Van Nieuwenhove}, R. and Wolf, {G. H.}",

year = "1992",

month = dec,

day = "1",

doi = "10.1016/S0022-3115(06)80009-7",

language = "English",

volume = "196-198",

pages = "35--44",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

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Hillis, DL, Hogan, JT, Finken, KH, West, WP, Weynants, RR, Wade, MR, Akaishi, K, Baek, WY, Boedo, J, Burrell, KH, Conn, RW, Dippel, KH, Doerner, R, Euringer, H, Finkenthal, D, Gray, DS, Greenfield, CM, Gohil, P, Groebner, RJ, Kim, J, Klepper, CC, Messiaen, AM, Mioduszewski, PK, Miyahara, A, Moyer, R, Van Oost, G, Pospieszcyk, A, Reiter, D, Rusbüldt, D, Seraydarian, RP, Van Nieuwenhove, R & Wolf, GH 1992, 'Helium transport in enhanced confinement regimes on the TEXTOR and DIII-D tokamaks', Journal of Nuclear Materials, vol. 196-198, no. C, pp. 35-44. https://doi.org/10.1016/S0022-3115(06)80009-7

TY - JOUR

T1 - Helium transport in enhanced confinement regimes on the TEXTOR and DIII-D tokamaks

AU - Hillis, D. L.

AU - Hogan, J. T.

AU - Finken, K. H.

AU - West, W. P.

AU - Weynants, R. R.

AU - Wade, M. R.

AU - Akaishi, K.

AU - Baek, W. Y.

AU - Boedo, J.

AU - Burrell, K. H.

AU - Conn, R. W.

AU - Dippel, K. H.

AU - Doerner, R.

AU - Euringer, H.

AU - Finkenthal, D.

AU - Gray, D. S.

AU - Greenfield, C. M.

AU - Gohil, P.

AU - Groebner, R. J.

AU - Kim, J.

AU - Klepper, C. C.

AU - Messiaen, A. M.

AU - Mioduszewski, P. K.

AU - Miyahara, A.

AU - Moyer, R.

AU - Van Oost, G.

AU - Pospieszcyk, A.

AU - Reiter, D.

AU - Rusbüldt, D.

AU - Seraydarian, R. P.

AU - Van Nieuwenhove, R.

AU - Wolf, G. H.

PY - 1992/12/1

Y1 - 1992/12/1

N2 - Comparisons of helium (He) transport and exhaust in L-mode and in an enhanced confinement regime (H-mode), which is induced by a polarizing electrode, have been made for the TEXTOR tokamak. The results show an increased tendency for He accumulation when bulk plasma energy and particle confinement are improved during the polarization-induced H-mode. Since these results imply that a high He pumping efficency may be necessary for H-mode burning plasmas, we have begun exploring He transport in a divertor H-mode, similar to that proposed for the international thermonuclear experimental reactor (ITER). A collaborative program has been initiated to measure He transport and scaling on DIII-D during L-mode, H-mode, and ELMing H-mode plasma conditions. To simulate the presence of He ash in DIII-D, a 25 ms He puff is injected into a DIII-D plasma, resulting in a He concentration of ≈5%. The time dependence of the He2+ density profiles in the plasma core is measured by charge-exchange recombination spectroscopy at 11 radial locations.

AB - Comparisons of helium (He) transport and exhaust in L-mode and in an enhanced confinement regime (H-mode), which is induced by a polarizing electrode, have been made for the TEXTOR tokamak. The results show an increased tendency for He accumulation when bulk plasma energy and particle confinement are improved during the polarization-induced H-mode. Since these results imply that a high He pumping efficency may be necessary for H-mode burning plasmas, we have begun exploring He transport in a divertor H-mode, similar to that proposed for the international thermonuclear experimental reactor (ITER). A collaborative program has been initiated to measure He transport and scaling on DIII-D during L-mode, H-mode, and ELMing H-mode plasma conditions. To simulate the presence of He ash in DIII-D, a 25 ms He puff is injected into a DIII-D plasma, resulting in a He concentration of ≈5%. The time dependence of the He2+ density profiles in the plasma core is measured by charge-exchange recombination spectroscopy at 11 radial locations.

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U2 - 10.1016/S0022-3115(06)80009-7

DO - 10.1016/S0022-3115(06)80009-7

M3 - Article

AN - SCOPUS:0026972560

SN - 0022-3115

VL - 196-198

SP - 35

EP - 44

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - C

ER -

Helium transport in enhanced confinement regimes on the TEXTOR and DIII-D tokamaks

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