DTT - Divertor Tokamak Test facility

Proceedings of conferences promoted by ENEA at Ecomondo (Rimini) in 2012, 2013 and 2014

Kind of publication : VOLUME

Edited by: Aldo Pizzuto

Publisher: ENEA

pp. 268, 2015

ISBN: 978-88-8286-318-0

Price: free


One of the main challenges in the Fusion roadmap is to develop a heat and power exhaust system able to withstand the large loads expected in the divertor of a fusion power plant. EUROfusion has launched a relevant project to investigate alternative power exhaust solutions, the design of a new machine named "Divertor Tokamak Test facility" (DTT), capable of integrating all the relevant physics and technology issues.

DTT should operate in integrated scenarios, with significant power loads, flexible divertors, plasma edge and bulk conditions approaching as much as possible those planned for DEMO. A trade-off between these requirements and the need to realize the new experiment accomplishing the DEMO timescale, leads to the choice of the following machine parameters:  major radius R=2.15 m, aspect ratio A=3.1 (A=R/a, where ‘a’ is the tokamak minor radius), toroidal field BT=6 T, plasma current Ip=6 MA, additional power PTot=45 MW. The machine will have the possibility to test several different magnetic divertor topologies. Different plasma facing materials will be tested (tungsten, liquid metals) up to a power flow of the order of 20MW/m2. The related studies and experiments will allow a valuable development of innovative technologies in several different fields, with relevant spin off for the industries of all European Countries.

According to the European Road Map, the DTT experiment should start its operation in 2022. To be coherent with this plan, the realization of the device will cover a time of around 7 years, starting from the first tender (during 2016) up to full commissioning and the first plasma.

The occupational impact is expected to be significant, with at least 150 people involved for the operation. A significant amount of on-site workers are expected during the construction, not to mention the indirect and spin-off opportunities. The expected economic impact on the hosting territory is also significant (e.g. the realization of buildings, electrical grid, maintenance, etc.). The continuous presence of an international scientific staff will cause a spin-off linked to the guest family life and activities.

Whereas the European Programme allocated about 60 M€ in Horizon 2020, the expected total cost for realizing this DTT proposal is estimated to be about 500 M€. Recently, Italian government  has offered the opportunity to get complementary funding for a dedicated exhaust facility located in Italy. The proposal is among the projects submitted to the 315 billion Euro of Juncker's plan (EFSI: European Fund for Strategic Investments).