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Ladder design of SVD2

Ladder design of SVD2. Y.Yamada in SVD meeting on Apr. 5, 2001. Gravitational sag of ladder supported at both edge : sagS = 5wL 4 /384EI ~ 28 m m for SVD1-3rd-layer fixed at both edge : sagF = wL 4 /384EI ~ 6 m m for SVD1-3rd-layer

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Ladder design of SVD2

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  1. Ladder design of SVD2 Y.Yamada in SVD meeting on Apr. 5, 2001 • Gravitational sag of ladder • supported at both edge : sagS = 5wL4/384EI ~ 28mm for SVD1-3rd-layer • fixed at both edge : sagF = wL4/384EI ~ 6mm for SVD1-3rd-layer • w(N/m):line density, L(m):length, E(N/m2):Young’s modulus, • I(m4): Moment of inertia of area = th3/12 where t(m):thickness of ribs, h(m):height of ribs • If E(SVD2)=E(SVD1), w(SVD2)=w(SVD1), t(SVD2)=t(SVD1), • sag(SVD2) = {h(SVD1)/h(SVD2)}3{L(SVD2)/L(SVD1)}4sag(SVD1) • L(SVD1-3rd) = 0.366 m, L(SDV2-4th) = 0.580 m, L(SVD2-5th) = 0.660 m • If h(SVD2) = h(SVD1) = 6.5 mm • sagS : 173 mm for SVD2-4th, 291 mm for SVD2-5th • sagF : 35 mm for SVD2-4th, 58 mm for SVD2-5th • If h(SVD2-4th) = 12.0 mm, h(SVD2-5th) = 9.6 mm (R-5th:9088mm) • sagS : 28 mm for SVD2-4th, 90 mm for SVD2-5th (become smaller with • sagF : 6 mm for SVD2-4th, 18 mm for SVD2-5th thicker/stronger rib) • If h(SVD2-5th) = 14.2 mm super layer structure for 4th & 5th layer • sagS : 28 mm for SVD2-5th • sagF : 6 mm for SVD2-5th

  2. Layout of half ladders • 1st layer : one_narrow_DSSD • 2nd layer : FWD : one_DSSD, BWD : one_DSSD • 3rd layer : FWD : one_DSSD, BWD : two_DSSD • 4th layer : FWD : two_DSSD, BWD : three_DSSD • 5th layer : FWD : three_wide_DSSD, BWD : three_wide_DSSD • variety of FLEX • f-FLEX for one_narrow_DSSD, for one_DSSD, • for two_DSSD (=one_DSSD in Non-Superlayer case), • for three_DSSD(=one_DSSD in Non-Superlayer case) and for three_wide_DSSD • Z-FLEX for one_narrow_DSSD, for one_DSSD, for two_DSSD, for three_DSSD • and for three_wide_DSSD • f/Z-FLEX for two_DSSD andthree_DSSDbecome longer (by 30mm?) • in Superlayer case • Pros and Cons of Superlayer • Pros : • stiffer 4th and 5th layer ladder • simpler endring • easier mounting (cabling) • Cons : • more spare ladders (more manpower and money) required • more difficult to assemble full ladders (?) • higher temperature of VA in 5th layer (2~3ºC?)

  3. End ring • Backward end ring • inner ring for 2nd layer • outer rings for 3rd/4th/5th layer • Forward end ring • inner ring for 1st/2nd super-layer • outer rings for 3rd/4th/5th layer

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