The notes about length of HV cables for the aerogel detector Page 1 A.Litvinenko

On the next four pages it is shown how the HV cables is installed for North part of detector and how it is proposed to be instolled for South part. The following numeration is used: 1. Counter have the identification marks consisting from whole number (from 0 to 79) and capital letter (N) or (S)for the North and South part respectively. The numeration is connected with aerogel radiator itself, start from the bottom of the two central columns and increase from bottom to top and from centre to the North (South) looking from collision point. 2. The identification marks for HV cable also consist from whole number (from 0 to 6) and capital letter (N) or (S)for the North and South part respectively. Page 2

NorthSouth Cab. #2 (N) Wires 1-10 Cab. #2(S) Wires 1-10 Cab.#1(S) Wires 1-20 Cab.#1(N) Wires 1-20 Cab. #1N) Wires 21-0 Cab. #1(S) Wires Cab#2(N) Wires Cab. #2(S) Wires Cab#3(N) Wires 1-20 Cab.#3(S) Wires 1-20 Cab.#4(N) Wires 1-10 Cab.#3(N) Wires Cab.#4(S) Wires 1-10 Cab.#3(S) Wires Cab.#5(N) Wires 1-20 Cab.#5(S) Wires 1-20 Cab.#5 (N) Wire Cab.#5(S) Wires Cab.#6 (N) Wire 1-10 Cab.#6(S) Wires 1-10 Cab.# 6(N) Wire Spare Cab.#6 (S) Wire Spare North HV Rack South HV Rack Collision vertex Top view on HV cables Cab.#6(S) Wires Cab.#6(S) Wires Page 3

Back (with respect to the collision vertex) view on the North HV cables. 0(N) 1(N) 2(N) 3(N) 4(N) 5(N) 6(N) 7(N) 8(N) 9(N) 20 (N) 21(N) 22(N) 23(N) 24(N) 25(N) 26(N) 27(N) 28(N) 29(N) 40(N) 41(N) 42(N) 43(N) 44(N) 45(N) 46(N) 47(N) 48(N) 49(N) 60(N) 61(N) 62(N) 63(N) 64(N) 65(N) 66(N) 67(N) 68(N) 69(N) Page 4

10(N) 11(N) 12(N) 13(N) 14(N) 15(N) 16(N) 17(N) 18(N) 19(N) 30(N) 31(N) 32(N) 33(N) 34(N) 35(N) 36(N) 37(N) 38(N) 39(N) 50(N) 51(N) 52(N) 53(N) 54(N) 55(N) 56(N) 57(N) 58(N) 59(N) 70(N) 71(N) 72(N) 73(N) 74(N) 75(N) 76(N) 77(N) 78(N) 79(N) Front (with respect to the collision vertex) view on the North HV cables. Page 5

10(S) 11(S) 12(S) 13(S) 14(S) 15(S) 16(S) 17(S) 18(S) 19(S) 30(S) 31(S) 32(S) 33(S) 34(S) 35(S) 36(S) 37(S) 38(S) 39(S) 50(S) 51(S) 52(S) 53(S) 54(S) 55(S) 56(S) 57(S) 58(S) 59(S) 70(S) 71(S) 72(S) 73(S) 74(S) 75(S) 76(S) 77(S) 78(S) 79(S) Back (with respect to the collision vertex) view on the South HV cables. Page 6

0(S) 1(S) 2(S) 3(S) 4(S) 5(S) 6(S) 7(S) 8(S) 9(S) 20 (S) 21(S) 22(S) 23(S) 24(S) 25(S) 26(S) 27(S) 28(S) 29(S) 40(S) 41(S) 42(S) 43(S) 44(S) 45(S) 46(S) 47(S) 48(S) 49(S) 60(S) 61(S) 62(S) 63(S) 64(S) 65(S) 66(S) 67(S) 68(S) 69(S) Front (with respect to the collision vertex) view on the South HV cables. Page 7

View on the cables path fromdetector to the rack (from Thomas Shea ). Page 8

Page 9 From the pages 3-7 one can see, that HV cable with the same # for North and South should have the different value if the distance from the end of the counters array to the corresponding rack is different for North and South (for South see page 8). Namely it is the following relation: L(Cab.#I(S)) = L(Cab.#I(N)) + L(C-R)_N - L(C-R)_S Were L(C-R)_N and L(C-R)_S are the lengths between the end of the counters array to the North or South rack respectively Moreover the lengths L_blue and L_white should be the same for North and South, and depend only from cable #. And only L_covered can be different for North and South : L _ covered (Cab.#I(S)) = L _ covered (Cab.#I(N)) + L(C-R)_N - L(C-R)_ S But as it follows from Tomas data the distances from the end of the counters array to the corresponding rack are the same for North and South (L(C-R)_N = L(C-R)_S ). It is mean that: the cables with the same numbers have to be the same for North and South (Cab.#I(S)=Cab.#I(N).