Fig. 1: Experimental set-up.
From: First measurements of p11B fusion in a magnetically confined plasma

(Left) 3D CAD model showing the LHD vacuum vessel with cut-away view of heliotron plasma. (Right) CAD image showing calculated alpha particle trajectories (green curves) reaching the PIPS detector near the LHD separatrix, a portion of the last closed flux surface (tan), and the PIPS detector, located below the plasma.