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Electric Field for the dEDM Experiment at the BNL AGS

Electric Field for the dEDM Experiment at the BNL AGS. Vasily Dzhordzhadze SPIN 2008, Charlotesvelle October 10, 2008. 1. dEDM Experiment at BNL AGS. Presented at the SPIN 2008 Conference by Y.Semetzidis, G.Onderwater, M. Silva, F.Lin

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Electric Field for the dEDM Experiment at the BNL AGS

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  1. Electric Field for the dEDM Experiment at the BNL AGS Vasily Dzhordzhadze SPIN 2008, Charlotesvelle October 10, 2008 1

  2. dEDM Experiment at BNL AGS • Presented at the SPIN 2008 Conference by Y.Semetzidis, G.Onderwater, M. Silva, F.Lin • Goal: Measurement of the deuteron electric dipole moment at 10-29 e.cm level • Principle: Polarize; • Interact with a E-Field; • Analyze Spin as a function of time 2

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  5. Clock Wise (CW) and Counter Clock Wise (CCW) injections CW and CCW injections to cancel all T-reversal preserving effects as, e.g., the out of plane <E-field>. EDM is T-violating and behaves differently. Issue: Stability as a function of time Solution: Use the 2-in-1 magnet design for simultaneous CW and CCW storage (Morse) or Gupta’s common coil magnet.

  6. E-field Plates Specs E-field: 120KV/cm with 2cm plate separation. The design should restrict E-field<=120KV/cm everywhere Two beams stored at the same time. They should not influence each other electrically:  min distance between the two beams is >15 cm. E-field uniformity: quad component < 1ppm  distance from end > 10cm; align plates to 1um. E-field stability requires temperature stability dT<10-3K; strong, sturdy plates Need to operate in a magnetic field: study and eliminate trapping effects

  7. E-field Plates 2 cm apart Plate thickness: ~1.5cm, Stainless steel Height: 40-60cm, may be taller Length ~3.3m/ea, 32 plates (16 pairs) total around the ring Radius of curvature: ~8.5m

  8. E-field plates: ~60cm high Aim for 10-5K/m temperature uniformity Vacuum chamber Stainless steel support

  9. POISSON Simulation of E-Fields 2 cm separation , r=2 cm 2 cm separation , r=5 cm 9 9

  10. Common Coil Design for EDM From R. Gupta’s presentation Coils Aperture #1 Iron Yoke Coils Aperture #2

  11. E-field strength

  12. E-field strength The field emission with and without high pressure water rinsing (HPR).

  13. Metal finishing • Electro polishing (EP) • Buffered Chemical Polishing -> Surface treatment by chemical solutions of NHO3, HF, H3PO4 (1: 1: 2): removal of 150 mm for 90 minutes or 30 mm for 20 minutes • Surface roughness measurements by profilometer (2mm) • High Pressure Water Rinsing 13

  14. ELECTROPOLISHING 14

  15. Before EP Before EP Before EP After EP 15

  16. High Pressure Water Rinsing Consist of High pressure pump, a spray wand and custom Nozzles. Systems are used as the final step in the surface Preparation. Uses ultra pure water with a pressure of ~1000 psi to remove all remnants of the mechanical finishing. Output pressure can reach 3000 psi. Water supply ~500 gallons. Rinsing process is fully programmable by a PC running LabView.

  17. High Pressure Water Rinsing 17

  18. E-field strength, Electrostatic Separators at Tevatron

  19. E-field strength, Electrostatic Separators at Tevatron

  20. E-field strength, Electrostatic Separators at Tevatron

  21. E-field strength, Electrostatic Separators at Tevatron

  22. E-field strength choice: 12 MV/m • FNAL 170 KV/late: no sparks in 7 days • Scaled to 2cm: gives 107 KV/cm, conditioned at 114 KV/cm. Scaled to 1.4cm : 128 KV/cm conditioned at 136KV/cm • Using HPWR we expect to achieve the 120 KV/cm strength at 2cm and certainly at 1.4 cm • O. Prokofiev (FNAL): It will require work but it can be done 22

  23. Measuring gravity direction with inclinometer of 10-10 rad sensitivity Caution: Moon’s max gravitational effect is ±3.5rad! Distance: 60 times earth’s radius and mass ~1% of earth’s We need to take it into account when using the inclinometer!

  24. Summary • We launched two programs for using BNL facilities for testing of the E-Field and gravitational stability • We will use a clean room available at a new Center for Functional Nanomaterials to assembly the vacuum chamber with plates and test them later. • We will get vibration free and strict temperature controlled room for our gravitational and position tests using inclinometer • Later tests will start immediately • Vacuum Chamber tests will start January 2009 • Expected first experimental results by Aril 2009 24

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