Design issues of the pre-compression rings of ITER

J. Knaster, W. Baker, L. Bettinali, C. Jong, K. Mallick, C. Nardi, H. Rajainmaki, P. Rossi, L. Semeraro

Research output: Contribution to conferencePaper

6 Citations (Scopus)

Abstract

The pre-compression system is the keystone of ITER. A centripetal force of ∼30MN will be applied at cryogenic conditions on top and bottom of each TF coil. It will prevent the 'breathing effect' caused by the bursting forces occurring during plasma operation that would affect the machine design life of 30000 cycles. Different alternatives have been studied throughout the years. There are two major design requirements limiting the engineering possibilities: 1) the limited available space and 2) the need to hamper eddy currents flowing in the structures. Six unidirectionally wound glassfibre composite rings (∼5 m diameter and ∼300 mm cross section) are the final design choice. The rings will withstand the maximum hoop stresses <500 MPa at room temperature conditions. Although retightening or replacing the pre-compression rings incase of malfunctioning is possible, they have to sustain the load during the entire 20 years of machine operation. The present paper summarizes the pre-compression ring R&D carried out during several years. In particular, we will address the composite choice and mechanical characterization, assessment of creep or stress relaxation phenomena, sub-sized rings testing and the optimal ring fabrication processes that have led to the present final design. © 2010 American Institute of Physics.
Original languageEnglish
DOIs
Publication statusPublished - 2010
Externally publishedYes
Event2009 Cryogenic Engineering and International Cryogenic Materials Conferences, CEC-ICMC 2009 - , United States
Duration: 1 Jan 2010 → …

Conference

Conference2009 Cryogenic Engineering and International Cryogenic Materials Conferences, CEC-ICMC 2009
CountryUnited States
Period1/1/10 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Knaster, J., Baker, W., Bettinali, L., Jong, C., Mallick, K., Nardi, C., Rajainmaki, H., Rossi, P., & Semeraro, L. (2010). Design issues of the pre-compression rings of ITER. Paper presented at 2009 Cryogenic Engineering and International Cryogenic Materials Conferences, CEC-ICMC 2009, United States. https://doi.org/10.1063/1.3402295