JT-60U MONTHLY SUMMARY

June 2007

  Objectives of JT-60 experiments during 2007-2008 were decided as follows,

• Extension of operation regime based on steady-state high beta research using modified heating system and optimized control system towards DEMO, ITER and JT-60SA.
• Development of real-time control scheme for burning plasma control and establishment of physics bases for accurate predictions of a plasma performance using newly installed diagnostics.
• Physics R&D for JT-60SA design.
• Targets

1. Achievement of long sustainment of high integrated performance
   β_N=2.5-3, HH>1, f_BS>0.4, τ_duration=25-30 s (~τ_NB-inj.)
2. Achievement of long sustainment of high beta exceeding no-wall ideal MHD limit
   β_N=3-3.5 (>β_N^no-wall), τ_duration=5-8 s (~τ_R)
3. Achievement of long sustainment of high radiation fraction
   f_rad>0.8, HH>0.9, n_e/n_GW>0.7, τ_duration=15-25 s (~τ_wall)