1. Chiho Wang ATLAS TRT Duke University IU, Oct. 2002 1 Fuse Box Design & Mounting Chiho Wang Duke University

2. Chiho Wang ATLAS TRT Duke University IU, Oct. 2002 2 HV granularity  Type 1: 14/module  6/module = 3/fuse box  Type 2: 12/module  6/module = 3/fuse box  Type 3: 10/module  10/module = 5/fuse/box  Present design: u type 1: 4 + 3 hv lines each box, no jumper u type 2: 3+3 hv lines each box, no jumper u type 3: 2+3 hv lines each box, 1 jumper through 1 dummy connector contact  Possible new design options u type 1: 1+2 hv lines each box, no jumper u type 2: 2+1 hv lines each box, 1 jumper or 3+0 hv lines each box, 3 jumpers u type 3: 3+2 hv lines each box, 1 jumper (no change **)

3. Chiho Wang ATLAS TRT Duke University IU, Oct. 2002 3 Design implications  Jumper: u wire  the 2 halves of a fuse box can not be separated. u Wire+sockets  2 halves separable but more mass & complexity  Symmetry: u Rotation symmetry for same side of fuse boxes (screw has to goes from outside to inside) u Mirror image symmetry for opposite side of module u If we can keep Rotation & Mirror symmetry on fuse box  Need only one type of fuse box for each type of module.

4. Chiho Wang ATLAS TRT Duke University IU, Oct. 2002 4 Type 1 Current Distribution (0 jumper)

5. Chiho Wang ATLAS TRT Duke University IU, Oct. 2002 5 Type 2 Current Distribution (1 external jumper, 2 internal jumpers)

6. Chiho Wang ATLAS TRT Duke University IU, Oct. 2002 6 Type 2 Current Distribution (3 jumper)

7. Chiho Wang ATLAS TRT Duke University IU, Oct. 2002 7 Type 3 Current Distribution (1 jumper)

8. Chiho Wang ATLAS TRT Duke University IU, Oct. 2002 8 Dimension, Mounting, Grounding  Dimension: R x  x Z u Type 1 : 71 x 20.15 x 12 mm u Type 2 : 98 x 20.15 x 12 mm u Type 3 : 148 x 20.15 x 12 mm  Mounting: u 2 screw holes in inner half of fuse box u matching tapped stand from roof or cooling plate provide >2-3 turns of thread. (actual design..??) u Nylon screw 2-56  Grounding: u A ground wire with pin coming out from fuse box and plug into a socket on roof or cooling plate.

9. Chiho Wang ATLAS TRT Duke University IU, Oct. 2002 9 Type 1 Dimension & Mounting

10. Chiho Wang ATLAS TRT Duke University IU, Oct. 2002 10 Remaining design issues  Inside fuse box: u Lay out/Optimize circuit in fuse box u Locate mounting hole positions  Outside fuse box u Design of stand, including mounting orientation (can fuse box lay flat?) u Allocate (& reserve) mounting space/location u Grounding socket location in roof/cooling plate Rotation symmetry on same side of module should be maintained to avoid complex wiring.