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GND noise snapshot on Dec 3 rd , 2008 – 10h00,12h30

4. 3. 2. 1. 7. 6. 8. 9. 5. 14. 10. 11. 12. 13. GND noise snapshot on Dec 3 rd , 2008 – 10h00,12h30. Ground noise at ALICE pit. Noisy ventilation OFF Frequency range 9kHz – 100MHz 91550-1 current probe and Rohde Schwarz spectrum analyzer. GND Ref1: cable from LHC tunnel A side

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GND noise snapshot on Dec 3 rd , 2008 – 10h00,12h30

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  1. 4 3 2 1 7 6 8 9 5 14 10 11 12 13 GND noise snapshot on Dec 3rd, 2008 – 10h00,12h30 Ground noise at ALICE pit Noisy ventilation OFF Frequency range 9kHz – 100MHz 91550-1 current probe and Rohde Schwarz spectrum analyzer

  2. GND Ref1: cable from LHC tunnel A side GND Ref2: lower cable from LHC service tunnel side A GND Ref3: upper cable from LHC service tunnel side A GND Ref4: cable from LHC service tunnel side C GND Ref5: cable at Muon red pillar I side GND Ref6: cable at dipole I side GND Ref7: cable at far end of Alice pit C, I sides

  3. GND Ref8: cable at Muon red pillar O side GND Ref9: cable at far end of Alice pit C, O sides GND Ref10: cable at dipole O side GND Ref11: cable at balcony A, O sides from top GND Ref12: cable at balcony A, O sides to bottom GND Ref13: cable below racks A, O sides GND Ref14: cables from inside solenoid A side

  4. GND Ref1: cable from LHC tunnel A side GND Ref2: lower cable from LHC service tunnel side A GND Ref3: upper cable from LHC service tunnel side A GND Ref4: cable from LHC service tunnel side C GND Ref5: cable at Muon red pillar I side GND Ref6: cable at dipole I side GND Ref7: cable at far end of Alice pit C, I sides

  5. GND Ref8: cable at Muon red pillar O side GND Ref9: cable at far end of Alice pit C, O sides GND Ref10: cable at dipole O side GND Ref11: cable at balcony A, O sides from top GND Ref12: cable at balcony A, O sides to bottom GND Ref13: cable below racks A, O sides GND Ref14: cables from inside solenoid A side

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