Slide 1

DBQ 5.63 Adding other steel components to the model Ben Shepherd January 2011 Slide 2 Components identified Rails 4 per magnet 12.5 x 15 x 473 mm 11mm from magnet edge Ballscrews 2 per magnet 20mm x 468mm 61mm from magnet edge Slide 3 Effect of steel components Any steel component going through the y=0 plane has a flux shorting effect reduces overall magnetic strength Started off with good magnetic steel (=5800) but this is unrealistic Ballscrew & rails will likely be made from 440C steel Permeability is variable (depending on manufacture) but typically between 100-1500 Change in is due to surface hardening realistic to assume same throughout? A softer steel (e.g. 316L) would have 10 Also tried moving rails out by 10mm but no difference Slide 4 CLIC DBD PMQs: Lower gradient version Ben Shepherd December 2010 Slide 5 Model geometry (6.17) Horizontally-magnetised PM slides up and down to vary the gradient (as 5.19) Shell around the outside to provide a secondary flux loop To reduce B mod : Shell made thicker (40mm) Corners rounded off with chamfers This leg can be moved to the left if nessary, with a slight reduction in gradient. Slide 6 Geometry in 3D 380mm 380mm 180mm 37.2mm 70mm Slide 7 Gradient variation Max: 49.0 T/m Min: 3.2 T/m (75mm movement) Slide 8 B mod with gradient change Stays within 1.6T for any gradient (0-75mm) Slide 9 A complete solution? At 60% along the DBD line, maximum strength required is 8.8T 49.0T/m * 180mm = 8.8T At 100% along the line, minimum strength is 0.85T 4.7T/m * 180mm = 0.85T So this quad could cover the remaining 40% of the line Also a shorter length than previous design 5.63.14 6.17