Induced voltages and currents in copper and stainless steel core mineral insulated cables due to radiation and thermal gradients

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Induced voltages and currents in copper and stainless steel core mineral insulated cables due to radiation and thermal gradients. / Vermeeren, Ludo; Wéber, Marcel; Dekeyser, Jean (Peer reviewer).

In: fusion engineering and design, Vol. 82, No. 5-14, 10.2007, p. 1185-1191.

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@article{e607c9db79d746bb8821107237eb319f,
title = "Induced voltages and currents in copper and stainless steel core mineral insulated cables due to radiation and thermal gradients",
abstract = "To reconstruct the shape and position of the plasma boundary of ITER, in-vessel magnetic coils will be employed, which will be exposed to radiation and temperature gradients. A study was undertaken to assess their impact on magnetic coil measurements and on other tokamak diagnostics employing mineral-insulated (MI) cables. Thermally induced electromotive force voltages in MI cables with Cu and stainless steel (SS) cores were measured using a scanning oven, establishing a well-defined temperature profile. Next, the MI cables were irradiated in the BR2 reactor, with the cables guided through a double-wall tube to create significant temperature gradients during the irradiation. The core-to-sheath currents were measured and interpreted. No correlation was observed between the core-to-core-voltages and the core-to-sheath current asymmetry. Significant core-to-core voltages were observed, which could be interpreted as due to the Seebeck effect with increasing Seebeck coefficients during the irradiation. The coefficient of the Cu core cable increased proportionally to the neutron fluence, which could be attributed to transmutation of Cu to Ni. For the SS core cable the coefficient was found to saturate at a local fluence of about 10E19 n/cm² and depended on the local temperature during irradiation.",
keywords = "Radiation induced electromotive force (RIEMF), thermal induced electromotive force (TIEMF), mineral insulated cable, diagnostics, magnetic coil, ITER",
author = "Ludo Vermeeren and Marcel W{\'e}ber and Jean Dekeyser",
note = "Score = 10; 24th Symposium on Fusion Technology (SOFT) ; Conference date: 11-09-2006 Through 15-09-2006",
year = "2007",
month = oct,
doi = "10.1016/j.fusengdes.2007.05.024",
language = "English",
volume = "82",
pages = "1185--1191",
journal = "Fusion Engineering & Design",
issn = "0920-3796",
publisher = "Elsevier",
number = "5-14",

}

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TY - JOUR

T1 - Induced voltages and currents in copper and stainless steel core mineral insulated cables due to radiation and thermal gradients

AU - Vermeeren, Ludo

AU - Wéber, Marcel

A2 - Dekeyser, Jean

N1 - Score = 10

PY - 2007/10

Y1 - 2007/10

N2 - To reconstruct the shape and position of the plasma boundary of ITER, in-vessel magnetic coils will be employed, which will be exposed to radiation and temperature gradients. A study was undertaken to assess their impact on magnetic coil measurements and on other tokamak diagnostics employing mineral-insulated (MI) cables. Thermally induced electromotive force voltages in MI cables with Cu and stainless steel (SS) cores were measured using a scanning oven, establishing a well-defined temperature profile. Next, the MI cables were irradiated in the BR2 reactor, with the cables guided through a double-wall tube to create significant temperature gradients during the irradiation. The core-to-sheath currents were measured and interpreted. No correlation was observed between the core-to-core-voltages and the core-to-sheath current asymmetry. Significant core-to-core voltages were observed, which could be interpreted as due to the Seebeck effect with increasing Seebeck coefficients during the irradiation. The coefficient of the Cu core cable increased proportionally to the neutron fluence, which could be attributed to transmutation of Cu to Ni. For the SS core cable the coefficient was found to saturate at a local fluence of about 10E19 n/cm² and depended on the local temperature during irradiation.

AB - To reconstruct the shape and position of the plasma boundary of ITER, in-vessel magnetic coils will be employed, which will be exposed to radiation and temperature gradients. A study was undertaken to assess their impact on magnetic coil measurements and on other tokamak diagnostics employing mineral-insulated (MI) cables. Thermally induced electromotive force voltages in MI cables with Cu and stainless steel (SS) cores were measured using a scanning oven, establishing a well-defined temperature profile. Next, the MI cables were irradiated in the BR2 reactor, with the cables guided through a double-wall tube to create significant temperature gradients during the irradiation. The core-to-sheath currents were measured and interpreted. No correlation was observed between the core-to-core-voltages and the core-to-sheath current asymmetry. Significant core-to-core voltages were observed, which could be interpreted as due to the Seebeck effect with increasing Seebeck coefficients during the irradiation. The coefficient of the Cu core cable increased proportionally to the neutron fluence, which could be attributed to transmutation of Cu to Ni. For the SS core cable the coefficient was found to saturate at a local fluence of about 10E19 n/cm² and depended on the local temperature during irradiation.

KW - Radiation induced electromotive force (RIEMF)

KW - thermal induced electromotive force (TIEMF)

KW - mineral insulated cable

KW - diagnostics

KW - magnetic coil

KW - ITER

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_83387

UR - http://knowledgecentre.sckcen.be/so2/bibref/4481

U2 - 10.1016/j.fusengdes.2007.05.024

DO - 10.1016/j.fusengdes.2007.05.024

M3 - Article

VL - 82

SP - 1185

EP - 1191

JO - Fusion Engineering & Design

JF - Fusion Engineering & Design

SN - 0920-3796

IS - 5-14

T2 - 24th Symposium on Fusion Technology (SOFT)

Y2 - 11 September 2006 through 15 September 2006

ER -

ID: 109262