MAST-U_RP_v3

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B. OPERATING SPACE AND SCENARIOSThe key plasma parameters for MAST and MAST Upgrade are given in Table 5, although itshould be noticed that a cautious approach will be adopted for the expansion of theoperating space in terms of plasma current, magnetic field, heating power and pulseduration. For example, shots at full TF are represent lifetime limiting events and hence willbe restricted especially in the early campaigns.Table 5 Key plasma parameters for MAST and MAST UpgradeParameter MAST MAST Upgrade Probable 2017Major radius (m) 0.85 0.85 0.85Minor radius (m) 0.65 0.65 0.65Plasma current (MA) 1.3 2.0 1.5Magnetic field at R=0.85m 0.52 0.75 0.6(T)Total NBI power (MW) 3.8 5.0 3.5On-axis NBI power (MW) 3.8 2.5 2.0Off-axis NBI power (MW) 0.0 2.5 1.75Pulse length (s) 0.6 5 2In addition to a wide range of divertor geometries discussed in section 3, MAST Upgradeprovides the opportunity to vary the shape of the last closed flux surface, allowinginvestigations of the effect of the plasma shape on core and edge phenomena. Figure 7illustrates the potential for plasma triangularity changes due to the variation of the currentin the ‘PX’ coil and MAST Upgrade will be capable of operation with single- or double-null X-point geometries.Figure 7 Main plasma shape variation as current in ‘PX’ coil is variedA range of plasma scenarios is envisaged for MAST Upgrade from low density plasmas,where neutral beam current drive is significant and plasma rotation and fast ion pressure islarge, to high density plasmas where the neoclassical bootstrap effect dominates the noninductivecurrent drive and fast ion physics becomes more classical due to the reduced drivefor energetic particle modes. In practice, the achievable range of plasma density will dependMAST-U_Research_Plan_v3.020
on many factors including: the balance of plasma fuelling, recycling and pumping; theaccessibility of H-mode the associated ELM behaviour, and the particle transport behaviourin the core plasma and scrape-off layer. Nevertheless, projections have been made for theoperating parameters of MAST Upgrade to provide notional plasma profiles that can serve asguidelines for the development of experimental proposals for the first campaigns.Plasma profiles for notional low and high density MAST Upgrade plasma scenariosare shown in Figure 7. These are simply projected using typical temperature and densityprofile shapes obtained in H-mode in experiments on existing ST devices. The plasmapressure has been normalised to provide H 98 =1 with a MAST Upgrade plasma shape. Theplasma current and magnetic field were set to be 1MA and 0.75T (at R=0.85m), respectively,and the NBI heating power was 5MW. The current drive has been calculated self-consistentlywith the kinetic profiles to provide a likely q-profile shape.C.D. INFORMATION FOR COLLABORATORSC.1. Data accessAKC.2. Publication policyAKC.3. Experiment planning and approval processAKormation for collaboratorFigure 8 Notional plasma profiles for low and high density MAST Upgrade plasmasMAST-U_Research_Plan_v3.021
Page 1 and 2: MAST Upgrade Research PlanJune 2015
Page 3 and 4: Stage 1: This refers to the additio
Page 5 and 6: that allows testing, development, a
Page 7 and 8: operation, with feed-forward contro
Page 9 and 10: MAST Upgrade will have 12 in-vessel
Page 11 and 12: section to ASDEX Upgrade and DIII-D
Page 13 and 14: Celeste)Fast ion D α (FIDA)STROBEI
Page 15 and 16: including 28GHz Heating and Start U
Page 17 and 18: APPENDICESA. RESTART SCOPE AFTER VE
Page 19: At this phase, the machine is ready
Page 23 and 24: D. PUBLICATION POLICYAll publicatio
Page 25: F. EUROFUSION ROADMAP HEADLINES•

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