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Status and schedule of ladder mounting

Status and schedule of ladder mounting. Y. Yamada at SVD meeting on Sep. 12, 2002. Second layer (11 out of 12) : 9 mounted. 10th (L2#7,P6) was dismounted due to unstable leak current. 11th is waiting for the study of leak current. Third layer (14 out of 18) :

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Status and schedule of ladder mounting

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  1. Status and schedule of ladder mounting Y. Yamada at SVD meeting on Sep. 12, 2002 • Second layer (11 out of 12) : 9 mounted. • 10th (L2#7,P6) was dismounted due to unstable leak current. • 11th is waiting for the study of leak current. • Third layer (14 out of 18) : • waiting for 4 more delivery around Sep. 20

  2. Large leak current on some ladders • e.g. L2#7 on P6 • ~3 mA before mounting • 2~9 mA after mounting • 2~4 mA after dismounting • plucking one of Bias-wires, • but no change in leak current

  3. Large leak current and CMN on some ladders • Layer 1 : less than 1 mA • Layer 2 : • less than 1 mA in L2#1, #4, #5, #6, #9, #10 • L2#3 on P9 : 2.0 mA • L2#12 on P13 : 1.4 mA • L2#8 on P16 : 3.2 mA • L2#2 on P17 : 3.86mA • L2#7 for P6 : 2.72~93.6mA • L2#13 for P7 : 5.01.0mA • L2#14 : 6.0 mA • Layer 3 : • less than 1 mA in L3#1, #2, #3, #5, #6 • L3#4 : 1.2 mA • L3#7 : 1.2 mA and CMN=6700e- • L3#8 : less than 1 mA but CMN=9500e-

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