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ISRM project IPQs & IPDs Splice measurements

ISRM project IPQs & IPDs Splice measurements. Various configurations in the machine Example of DFBAs in RIGHT sides:. 8 m. 50 m. 90 m. 130 m. Courtesy of A. Jacquemod. Because of lack of voltage taps, we measure the average resistance over each interconnection

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ISRM project IPQs & IPDs Splice measurements

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  1. ISRM project • IPQs & IPDs Splice measurements

  2. Various configurations in the machineExample of DFBAs in RIGHT sides: 8 m 50 m 90 m 130 m Courtesy of A. Jacquemod • Because of lack of voltage taps, we measure the average resistance over each interconnection • We do not measure magnet internal splices

  3. Various configurations in the machineExample of DFBAs in LEFT sides: Courtesy of A. Jacquemod • Praying hand splices were identified as a potentially risky design

  4. Various configurations in the machineExample of smaller DFBs: Courtesy of A. Jacquemod

  5. Map of the LHC:

  6. Status on 12/07/2011: • Non counted: • + 4 D1 magnets (DFBXs) • We need 4 more technical stops to complete the whole machine (without DFBXs)! • 2 TS this year + 2 TS next year • Maybe less if we can do some tests during the next Christmas break?

  7. Example of measurement on RQ10.R4 I have removed the inductive voltage during ramps!

  8. Example of measurement on RQ10.R4 Error on the fit gives +/- 0.11 nW: Very good ! For a SAM we can achieve a resolution 10 times better R4 is very quite in term of noise compared to the rest of the machine

  9. Very noisy measurements on RQ9.L8:

  10. Example of measurement on RQ10.R4 Same scale as previous slide with RQ9.L8 measurements!

  11. Measurements analyses: Point 2 and point 8 are very noisy as expected (closest points to SPS injection lines) Point 1L (but not 1R ???),

  12. Measurements analyses: RQ10.R4 previous example RQ9.L8 previous example

  13. Measurements analyses: For Q7 to Q10 magnets, most of the measurements were carried out at night! Exceptions are in L1, L2, Q10.R2, Q7, Q8 and Q9.R8 but not Q10.R8

  14. Measurements analyses:

  15. Measurements analyses: Statistics: over 199 measurements

  16. Measurements analyses:

  17. Measurements analyses:

  18. Measurements analyses:

  19. Conclusions • We have done so far 23 installation/removal of our 2x IRSM systems: It has to be done carefully but we can say that the method is well mastered! • It involves switching off HDSs, connecting/disconnecting instrumentation cables, resetting/power cycling QPS controllers and switching back on HDSs. • Also disconnecting/reconnecting the water cooled DC cables for hipotting of the circuit once the ISRM system is connected. • We have seen that we can measure IPDs, DFBLs, SAM without any problem. No showstoppers! • As foreseen, the RQ10 and RQ9 magnets are the most difficult magnets to measure because of long distances causing more noisy measurements, especially in point 1, 2 and 8. • It looks also that there is a correlation between noise level and time of measurements (ie. Measurements at night give better results). • Should we re-measure some positions? • Until now all splices measured seem to be correct.

  20. Thank you for your attention!

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