MP3,07/10/2009, Z.Charifoulline 1
2kA Splice Mapping Results for RB.A78
“Special” PLI2.s1 test was done on RB.78 at 03/10/2009, 20h35-23h50;
The current steps: 0,760A,1200A,1600A,2000A,…,0 (9 plateaus) The ramp rate: 10A/sThe plateau time: >10mins.
MP3,07/10/2009, Z.Charifoulline 2
U_RES_SPLICE vs Time & I_MEAS vs Time
MP3,07/10/2009, Z.Charifoulline 3
A78.RB: BusSegment Resistance vs nQPS Unit (current flow)
MP3,07/10/2009, Z.Charifoulline 4
Noise: StdDev of U_RES on plateaus
MP3,07/10/2009, Z.Charifoulline 5
~2uV
MP3,07/10/2009, Z.Charifoulline 6
A78.RB: Normalized BusSegment Resistance
MP3,07/10/2009, Z.Charifoulline 7
A12.RB: Normalized BusSegment Resistance
MP3,07/10/2009, Z.Charifoulline 8
A78.RB: Normalized BusSegment Resistance
MP3,07/10/2009, Z.Charifoulline 9
A78.RB: Normalized BusSegment Resistance
MP3,07/10/2009, Z.Charifoulline 10
A78.RB: Normalized BusSegment Resistance & Excess
MP3,07/10/2009, Z.Charifoulline 11
num Measured Resistance
Excess Resistance
QPS Unit Bus Bar
20 1.8 ± 1.9 nΩ ~0.95 nΩ B20L8(2) B21L8 <-> A22L8
28 1.2 ± 2.2 nΩ ~1.0 nΩ B26L8(1) C26L8 <-> B27L8
66 1.5 ± 0.5 nΩ ~0.95 nΩ B17R7(1) C17R7 <-> A17R7
99 1.4 ± 0.5 nΩ ~0.80 nΩ B22R7(0) A22R7 <-> C22R7
106 1.9 ± 0.5 nΩ ~1.05 nΩ B26R7(1) C26R7 <-> B27R7
122 1.8 ± 0.3 nΩ ~0.95 nΩ B31L8(0) B32L8 <-> C31L8
124 1.7 ± 0.7 nΩ ~0.80 nΩ B31L8(2) A31L8 <-> B30L8
Top 7 excess resistances (Rexcess = Rmeas - Nsplice*Rsplice)
MP3,07/10/2009, Z.Charifoulline 12
U_RES(I) = U0 + Rbus*I + ∆α*U_MAG(I);U_MAG(I) = U0 + Rmag*I;
MP3,07/10/2009, Z.Charifoulline 13
MP3,07/10/2009, Z.Charifoulline 14
A8R7,A10R7,A12R7,…,A34R7 <– 27 magnets are missing;
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