PPT Slide

Off-Axis Seed CD with Lower Hybrid Power

• CURRAY ray tracing code is used for analysis.

• Six waveguide modules, each launching a different N|| spectrum, are required

to drive the required off-axis seed current profile. These are located at the

OB midplane, although results are not sensitive to waveguide location.

• Alpha absorption is not an issue for off-axis drive at a high enough frequency.

• For the same plasma, frequency

is 3.6 GHz, and the launched

spectra are:

N|| P(MW) Icd/Isd

1.6 9.1 0.2

1.8 3.1 0.1

2.0 6.8 0.2

2.5 8.4 0.2

3.0 5.3 0.1

4.0 17.0 0.2

total

N|| = 1.6

1.8

2.0

2.5

4.0

3.0

f = 3.6 GHz

LHCD

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