Local transport measurements during auxiliary heating in TFTR

S. D. Scott; C. W. Barnes; L. R. Grisham; G. W. Hammett; W. W. Heidbrink; D. W. Johnson; Y. Kusama; M. C. Zarnstorff; S. J. Zweben; M. G. Bell; M. Bitter; R. Boivin; R. Budny; C. E. Bush; A. Cavallo; C. Z. Cheng

Local transport measurements during auxiliary heating in TFTR

S. D. Scott, C. W. Barnes, L. R. Grisham, G. W. Hammett, W. W. Heidbrink, D. W. Johnson, Y. Kusama, M. C. Zarnstorff, S. J. Zweben, M. G. Bell, M. Bitter, R. Boivin, R. Budny, C. E. Bush, A. Cavallo, C. Z. Cheng

Institute of Space and Plasma Sciences

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

13 Citations (Scopus)

Abstract

Local heat and momentum transport is analyzed in beam-heated steady-state TFTR plasmas using measured profiles for temperature and rotation speed over a wide range of plasma conditions. As heating power is increased in high-recycling 'L-mode' plasmas, the thermal diffusivities χ_i(r) and χ_e(r) are found to increase strongly with temperature throughout the plasma confinement zone. Both chi_i and chi_e decrease with increasing plasma current in steady state L-mode plasmas. Dedicated major-radius and aspect ratio scaling experiments show that the global confinement time τ_E has a strong dependence on major radius and a weak dependence on minor radius in L-mode plasmas, τ_E ∝ R^{approximately 1.6} a^{approximately 0}. Kadomtsev dimensionless scaling of the ohmic τ_E obtained in Alcator C and PLT to TFTR at constant n̄_e/B_T^1.6, q_cyl, and a/R underpredicts τ_E by about a factor of two, possibly due to variations in L_n(e)/a. Ion heat and momentum transport in low-recycling TFTR 'supershot' plasmas shows an inverse dependence on temperature. Several independent measurements of radial-particle transport indicate diffusivities of order ≲0.1 m²/s for energetic ions (approximately 30 keV → MeV), an order of magnitude less than the observed thermal transport rates.

Original language	English
Title of host publication	Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res
Publisher	Publ by IAEA
Pages	235-259
Number of pages	25
ISBN (Print)	9201300913
Publication status	Published - 1991

Publication series

Name	Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res

All Science Journal Classification (ASJC) codes

General Engineering

Cite this

Scott, S. D., Barnes, C. W., Grisham, L. R., Hammett, G. W., Heidbrink, W. W., Johnson, D. W., Kusama, Y., Zarnstorff, M. C., Zweben, S. J., Bell, M. G., Bitter, M., Boivin, R., Budny, R., Bush, C. E., Cavallo, A., & Cheng, C. Z. (1991). Local transport measurements during auxiliary heating in TFTR. In Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res (pp. 235-259). (Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res). Publ by IAEA.

@inproceedings{19ee77d395a54aed9188a85145041b54,

title = "Local transport measurements during auxiliary heating in TFTR",

abstract = "Local heat and momentum transport is analyzed in beam-heated steady-state TFTR plasmas using measured profiles for temperature and rotation speed over a wide range of plasma conditions. As heating power is increased in high-recycling 'L-mode' plasmas, the thermal diffusivities χi(r) and χe(r) are found to increase strongly with temperature throughout the plasma confinement zone. Both chii and chie decrease with increasing plasma current in steady state L-mode plasmas. Dedicated major-radius and aspect ratio scaling experiments show that the global confinement time τE has a strong dependence on major radius and a weak dependence on minor radius in L-mode plasmas, τE ∝ Rapproximately 1.6 aapproximately 0. Kadomtsev dimensionless scaling of the ohmic τE obtained in Alcator C and PLT to TFTR at constant {\=n}e/BT1.6, qcyl, and a/R underpredicts τE by about a factor of two, possibly due to variations in Ln(e)/a. Ion heat and momentum transport in low-recycling TFTR 'supershot' plasmas shows an inverse dependence on temperature. Several independent measurements of radial-particle transport indicate diffusivities of order ≲0.1 m2/s for energetic ions (approximately 30 keV → MeV), an order of magnitude less than the observed thermal transport rates.",

author = "Scott, {S. D.} and Barnes, {C. W.} and Grisham, {L. R.} and Hammett, {G. W.} and Heidbrink, {W. W.} and Johnson, {D. W.} and Y. Kusama and Zarnstorff, {M. C.} and Zweben, {S. J.} and Bell, {M. G.} and M. Bitter and R. Boivin and R. Budny and Bush, {C. E.} and A. Cavallo and Cheng, {C. Z.}",

year = "1991",

language = "English",

isbn = "9201300913",

series = "Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res",

publisher = "Publ by IAEA",

pages = "235--259",

booktitle = "Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res",

}

Scott, SD, Barnes, CW, Grisham, LR, Hammett, GW, Heidbrink, WW, Johnson, DW, Kusama, Y, Zarnstorff, MC, Zweben, SJ, Bell, MG, Bitter, M, Boivin, R, Budny, R, Bush, CE, Cavallo, A & Cheng, CZ 1991, Local transport measurements during auxiliary heating in TFTR. in Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res. Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res, Publ by IAEA, pp. 235-259.

TY - GEN

T1 - Local transport measurements during auxiliary heating in TFTR

AU - Scott, S. D.

AU - Barnes, C. W.

AU - Grisham, L. R.

AU - Hammett, G. W.

AU - Heidbrink, W. W.

AU - Johnson, D. W.

AU - Kusama, Y.

AU - Zarnstorff, M. C.

AU - Zweben, S. J.

AU - Bell, M. G.

AU - Bitter, M.

AU - Boivin, R.

AU - Budny, R.

AU - Bush, C. E.

AU - Cavallo, A.

AU - Cheng, C. Z.

PY - 1991

Y1 - 1991

N2 - Local heat and momentum transport is analyzed in beam-heated steady-state TFTR plasmas using measured profiles for temperature and rotation speed over a wide range of plasma conditions. As heating power is increased in high-recycling 'L-mode' plasmas, the thermal diffusivities χi(r) and χe(r) are found to increase strongly with temperature throughout the plasma confinement zone. Both chii and chie decrease with increasing plasma current in steady state L-mode plasmas. Dedicated major-radius and aspect ratio scaling experiments show that the global confinement time τE has a strong dependence on major radius and a weak dependence on minor radius in L-mode plasmas, τE ∝ Rapproximately 1.6 aapproximately 0. Kadomtsev dimensionless scaling of the ohmic τE obtained in Alcator C and PLT to TFTR at constant n̄e/BT1.6, qcyl, and a/R underpredicts τE by about a factor of two, possibly due to variations in Ln(e)/a. Ion heat and momentum transport in low-recycling TFTR 'supershot' plasmas shows an inverse dependence on temperature. Several independent measurements of radial-particle transport indicate diffusivities of order ≲0.1 m2/s for energetic ions (approximately 30 keV → MeV), an order of magnitude less than the observed thermal transport rates.

AB - Local heat and momentum transport is analyzed in beam-heated steady-state TFTR plasmas using measured profiles for temperature and rotation speed over a wide range of plasma conditions. As heating power is increased in high-recycling 'L-mode' plasmas, the thermal diffusivities χi(r) and χe(r) are found to increase strongly with temperature throughout the plasma confinement zone. Both chii and chie decrease with increasing plasma current in steady state L-mode plasmas. Dedicated major-radius and aspect ratio scaling experiments show that the global confinement time τE has a strong dependence on major radius and a weak dependence on minor radius in L-mode plasmas, τE ∝ Rapproximately 1.6 aapproximately 0. Kadomtsev dimensionless scaling of the ohmic τE obtained in Alcator C and PLT to TFTR at constant n̄e/BT1.6, qcyl, and a/R underpredicts τE by about a factor of two, possibly due to variations in Ln(e)/a. Ion heat and momentum transport in low-recycling TFTR 'supershot' plasmas shows an inverse dependence on temperature. Several independent measurements of radial-particle transport indicate diffusivities of order ≲0.1 m2/s for energetic ions (approximately 30 keV → MeV), an order of magnitude less than the observed thermal transport rates.

UR - http://www.scopus.com/inward/record.url?scp=0025796068&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0025796068&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0025796068

SN - 9201300913

T3 - Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res

SP - 235

EP - 259

BT - Proc 13 Int Conf Plasma Phys Controlled Nucl Fusion Res

PB - Publ by IAEA

ER -

Local transport measurements during auxiliary heating in TFTR

Abstract

Publication series

All Science Journal Classification (ASJC) codes

Other files and links

Fingerprint

Cite this