The Divertor Cassette Project has met its objective, which was to develop the technology needed to construct full-scale armoured components capable of meeting the inter-connected issues of providing adequate armour lifetime, armour-heat sink joint lifetime (CfC-Cu & W-Cu) and heat sink lifetime, sustaining thermo-hydraulic and electro-mechanical loads, whilst seeking the most cost effective and reliable manufacturing options.

All four original ITER Parties have contributed to the development of the armoured plasma-facing divertor components which are to be assembled on a stainless steel cassette body.

The figures below summarise the high heat flux performance of CfC armour to Cu heat sink joints and tungsten armour to Cu heat sink joints. The test results show that the monoblock, flat tile and saddleblock geometries all have the capability to meet the ITER requirements. However, the monoblock proved to be the most reliable with no reported complete detachment of tiles. The tungsten brush type armour was developed during the EDA. This proved to be a solution to having a Cu-W joint capable of overcoming the problem of the large difference in thermal expansion of the two materials combined with high heat flux loads.

CfC - Cu Joint Performance	Tungsten - Cu Joint Performance

Aside from testing the viability of plasma facing component designs, one of the main aims of the L-5 project was to integrate key plasma facing components together onto a realistic prototype of the cassete body. To save money it is not essential to use all the real materials for this, and dummy components have been made. These are thermohydraulic equivalents of the real components, and in addition partial full size prototypes of the components are being high heat flux tested. Major issues include the bonding of different plasma facing materials on the same component, the selection of the heat sink material (CuCrZr preferred), and the demonstration that it maintains its properties after manufacturing.

Liner section installed in the Efremov (RF) resistance brazing facility used for fast brazing of W & Be armour to the CuCrZr heat sink.	CfC monoblock and W brush armoured vertical target mock-up manufactured by Plansee GmbH (EU).
This full-scale vertical target armoured mock-up built by Hitachi Ltd (JA) mock-up uses a pure Cu clad DS-Cu tube armoured with saddle-block CfC and CVD-W armours.	Built by Kawasaki Heavy Industries (JA) this mock-up uses a pure Cu clad DS-Cu tube armoured with CfC monoblocks.
A prototypical cast stainless steel cassette body segment designed to support the armoured divertor plasma facing components, supplied by Boeing (US), is shown under fabrication

The following shows the inboard divertor channel integration mockups assembled in the US prior to flow testing (second picture).

Following the decision of the US to pull out of ITER, the EU has constructed an integration prototype. This integrates the EU outer cassette body, vertical target and wing mockups with the RF liner mockup (not present in the picture). This prototype assembly was completed in May 2000, and thermal cycling and flow tests carried out.