Overview of damage to beryllium limiters by unmitigated disruptions and runaway electrons in the JET tokamak with metal walls

• DOI: 10.1088/1741-4326/ad6614
• Publication Date: 2024-07-22T22:48:11Z
• Authors: I. Jepu; A. Widdowson; G.F. Matthews; J.P. Coad; J. Likonen; S. Brezinsek; M. Rubel; G. Pintsuk; P. Petersson; E. Fortuna-Zalesna; J. Grzonka; C. Porosnicu; P. Dinca; O. Pompilian; B. Butoi; S. G. Moga; S. Silburn; S. Kuksenko; E. Alves; N. Catarino; R.A. Pitts; L. Chen; S. Ratynskaia
• Keywords: Limiter

Abstract The Joint European Torus (JET) fusion reactor was upgraded to the metallic wall configuration in 2011 which consisted of bulk beryllium (Be) tiles main chamber and tungsten (W) W-coated CFC divertor (Matthews G.F. et al Phys. Scr. T148 014001). During each campaign, a series damages were observed; on upper dump plates (UDP) positioned top part vessel walls inner wall—mainly affecting guard limiters (IWGL). In both cases, it concluded that causes these unmitigated plasma disruptions. case JET with configuration, most disruptions intentionally provoked. overall objective study behaviour phenomena, order assess their impact wall, improve understanding morphological material changes, and—based that—to develop, implement test mitigation techniques for prospective use ITER. current results bring additional information effects UDPs are significant extension work presented (Jepu 2019 Nucl. Fusion 59 086009) where scale damage after three operational campaigns Be highlighted. addition, new data is damaging effect high energetic runaway electrons had IWGL JET.