D R A F T - 16-Jan-2006

WBS 5.1 Ion Cyclotron Heating and Current Drive System

Ion Cyclotron Antenna

Procurement Package 5.1-1
Ion Cyclotron Heating & Current Drive Launcher Assembly"

ITER Cost 2001 for Sharing: 4,5 kIUA

Sharing: EU=100%

Function, Scope of Supply:

The ICH&CD system provides two essential functions: plasma heating and on-axis current drive, and several auxiliary functions: plasma and burn control, help in plasma shut-down, wall conditioning at full field, plasma breakdown and assisted current rise. A total of 20 MW of RF power is initially available from the system in the frequency band 35-65 MHz.


The procurement detailed in this section is for:

·        One IC H&CD Launcher

·        One IC H&CD Launcher Test Stand


Description, Technologies :

The IC H&CD launcher includes all components located in the ITER vacuum vessel and it is integrated in an equatorial port and included within the vacuum/tritium confinement boundary of the torus. The array includes the plasma-facing components [the Faraday shield and, in part, the current strap(s)] that experience the same level of neutron fluxes and plasma radiation as the blanket first wall, and are to be designed to the same specifications. The other components of the launcher are screened from direct plasma view and shielded from high neutron doses. The launcher consists of an array of eight resonant double loop (RDL) modules, each composed of two half sections of strip lines (current straps) facing the plasma and folded in the middle into the port, and connected by means of two tuning networks to a single coaxial vacuum feeder. The RDL(s) are arranged in the port in a 4x2 matrix and designed to operate at a RF r.m.s power of 2.5 MW (continuous operation).

Other components of the launcher are the Faraday shield, directly facing the plasma, and the Neutron Shield, which has the function of adsorbing the neutron flux coming from the plasma. A box–like support structure mechanically assembles the eight RDL modules and interfaces with the vacuum vessel port closure plate, which provides structural and primary vacuum/tritium containment functions. The overall launcher assembly cantilevers on to the closure plate and is not in contact with other parts of the vacuum vessel port.

Each array module is fed by a coaxial transmission line (vacuum transmission line - VTL) containing dielectric components: the (double) vacuum window, which is part of the ITER vacuum and tritium containment, and VTL dielectric supports holding in place the VTL inner conductor.

These components are embedded in the neutron shield and sufficiently shielded to prevent large dielectric degradation. Depending on the pressure of neutral particles in the VTL, active pumping may be necessary, in order to keep the base pressure below 10-2 Pa and to avoid RF breakdown. Getter pumps, located under vacuum and periodically re-generated, are used for this purpose. The pumping and vacuum monitoring systems are not included within the scope of this procurement.

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