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First results with 3-strap ICRF antennas in ASDEX Upgrade
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Abstract
The 3-strap antennas in ASDEX Upgrade allow ICRF operation with low tungsten (W) content in the confined plasma with W-coated antenna limiters. With the 3-strap antenna configuration, the local W impurity source at the antenna is drastically reduced and the core W concentration is similar to that of the boron coated 2-strap antenna at a given ICRF power. Operation of the 3-strap antennas with the power ratio between the central and the outer straps of
1.5
:
1
and
2
:
1
is adopted to minimize the ICRF-specific W release.
Title: First results with 3-strap ICRF antennas in ASDEX Upgrade
Description:
Abstract
The 3-strap antennas in ASDEX Upgrade allow ICRF operation with low tungsten (W) content in the confined plasma with W-coated antenna limiters.
With the 3-strap antenna configuration, the local W impurity source at the antenna is drastically reduced and the core W concentration is similar to that of the boron coated 2-strap antenna at a given ICRF power.
Operation of the 3-strap antennas with the power ratio between the central and the outer straps of
1.
5
:
1
and
2
:
1
is adopted to minimize the ICRF-specific W release.
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