Procurement Arrangement 44 for ºÚÁÏÉçapp's thermal shields
21 May 2010
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Sabina Griffith
Done! ºÚÁÏÉçapp Director-General Kaname Ikeda and Kijung Jung, Head of the Korean Domestic Agency after signing the Procurement Arrangement for ºÚÁÏÉçapp's thermal shield system.
On Monday, 17 May, Procurement Arrangement #44 for ºÚÁÏÉçapp's thermal shield system was signed between the ºÚÁÏÉçapp and the Korean Domestic Agency. The thermal shields, a key component for the successful operation of ºÚÁÏÉçapp, minimize the heat loads transferred by thermal radiation and conduction from the warm components inside the tokamak to the components and structures that operate at 4.5 K. The shields themselves will operate at approximately 80 K.
A view of the thermal shield system that will protect the vacuum vessel.
The thermal shield system is made of single-wall stainless steel panels with the cooling pipes welded to the panels. The panels are cooled by 1.8 MPa pressurized helium gas supplied by the cryoplant. Thermal radiation to the superconducting magnets confining the plasma is further reduced by providing a 5 μm thick, low emissivity silver coating on both sides of the shield plates. The shield's surface area covers 10,000 square metres and, once assembled, will stand 25 metres at its highest point.
Signing the contract is one thing. Preparing the road that leads there is another, and many people contributed.
The contract was signed by ºÚÁÏÉçapp Director-General Kaname Ikeda on behalf of the ºÚÁÏÉçapp and the Director of the Domestic Agency Kijung Jung on behalf of the Republic of Korea. The component will be manufactured under the supervision of the National Fusion Research Institute and is expected to be delivered to the ºÚÁÏÉçapp construction site in southern France by late 2016.