Neutron Electric Dipole Moment Experiment at PSI. Kazimierz Bodek for the nedm Collaboration
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1 Neutron Electric Dipole Moment Experiment at PSI Kazimierz Bodek for the nedm Collaboration
2 The Neutron EDM Collaboration G. Ban, Th. Lefort, O. Naviliat-Cuncic Laboratoire de Physique Corpusculaire, Caen, France K. Bodek, St. Kistryn, M. Kuzniak2, J. Zejma Institute of Physics, Jagiellonian University, Cracow, Poland N. Khomytov, B.M. Sabirov Joint Institute of Nuclear Reasearch, Dubna, Russia P. Knowles, M. Rebetez, A. Weis Departement de Physique, Université de Fribourg, Fribourg, Switzerland C. Plonka, G. Rogel1 Institut Laue-Langevin, Grenoble, France G. Quéméner, D. Rebreyend, S. Roccia, M. Tur Laboratoire de Physique Subatomique et de Cosmologie, Grenoble, France M. Daum, R. Henneck, S. Heule3, M. Kasprzak4, K. Kirch, A. Knecht3, B. Lauss, A. Mchedlishvili, G. Zsigmond Paul Scherrer Institut, Villigen, Switzerland S. Baessler, K. Eberhardt, G. Hampel, W. Heil, J.V. Kratz, Y. Sobolev, N. Wiehl Johannes-Gutenberg-Universität, Mainz,Germany I. Altarev, E. Gutsmiedl, R. Stoepler, S. Paul Technische Universitaet, Munich, Germany N. Severijns Katolieke Universiteit, Leuven, Belgium also at: LPC Caen, 2Paul Scherrer Institut, 3University of Zürich, 4SMI Vienna 1
3 Context: OILL
4 Context:
5 Our strategy
6 Strategy Phase I: Operate and improve (- 2008) Move of OILL in 2008 (approved by RAL/Sussex) Design of n2edm, related R&D Phase II: Operate ( ) Sensitivity goal: 5x10-27ecm Setup of n2edm, continued R&D Phase III: Operate ( ) Sensitivity goal: 5x10-28ecm
7 Phase I: O&M + R&D fruitful discussions with the colleagues of the former RAL-Sussex-ILL collaboration are gratefully acknowledged
8 Phase I: O&M + R&D New DAQ
9 Phase I: O&M + R&D UCN polarization simultaneous analysis of both spin states velocity dependent UCN detection
10 Phase I: O&M + R&D New chamber materials Shutters Guides
11 Phase I: O&M + R&D New HV system, power supply, current monitor, cable, feed through
12 Phase I: O&M + R&D Hg magnetometer improvement 2nd co-magnetometer
13 Phase I: O&M + R&D LsOpM Cs magnetometry
14 Polarization and detection Polarizer: superconducting magnet Analysis: Symmetric two arm setup Each arm: spin flipper - analyzer - detector N Detection: det 1 SF1 SF2 N S S det 2 Comparative tests between 3He-, GEM- and Li-glass scintillators Velocity dependent detector
15
16
17 CS magnetometers in EDM
18 Operating CS and Hg simultaneously
19 Operating Cs and Hg simultaneously Active B-field stabilization in EDM with Cs-magnetometer works! P. Knowles et al PRL82(1999) pt 50 pt ~1 pt 1h
20 A new dimension in diagnostics
21 A new dimension in diagnostics
22 Vacuum & HV compatible Cs-OPM
23 External Cs magnetometry Superstable current source (<10-8) Stabilize magnetic field and gradients Many (vector) CsM for monitoring B field But: External magnetometry not sensitive enough to leakage currents and magnetic wall impurities 3He (129Xe) magnetometry: Read by Cs-OPM (PTB) Forced (Cs) versus free (3He) Co-magnetometry (3He, 129Xe)
24 Magnetometer comparison ongoing
25 Co-co-magnetometry Potential co-magnetometer candidates: Hg (7.7 Hz/µT), 129Xe (-11.8 Hz/µT), 3He (-32.4 Hz/µT) 199 Geometrical phase induced false effect: (Pendlebury et al., PRA70(2004)032102) daf,atom ~ g2 R2 dbz/dz daf,n ~ <v2ucn> Bz-2 dbz/dz Example: Bz=1mT, dbz/dz=1nt/m daf,n ~ 10-27e cm daf,hg ~ 13 x daf,n daf,xe ~ 2 x daf,hg daf,he ~ 18 x daf,hg Two null results for atomic co-magnetometers could prove the stability of the B-field magnitude and the absence of gradients
26 Strategy Phase I: Operate and improve (- 2008) Move of OILL in 2008 (approved by RAL/Sussex) Design of n2edm, related R&D Phase II: Operate ( ) Sensitivity goal: 5x10-27ecm Setup of n2edm, continued R&D Phase III: Operate ( ) Sensitivity goal: 5x10-28ecm
27 Statistics Si3N4 incompatible with Hg Diamond coating has conductive interface with substrate DPS favorite, has similar Fermi potential to Si3N4, ongoing dots experiment open circles MC
28 UCN source Phase II: OILL MC predicts ~25 times higher statistics CsM monitoring and stabilization of the field HgM with improved sensitivity B-field control to better 100fT/100s SC Polarizer Sensitivity goal: 5x10-27ecm n2edm
29 Phase III: Large double chamber volume Better adaption to UCN beam Improved CsM monitoring and stabilization At least one co-magnetometer (R&D on Hg, He, Xe) Sensitivity goal: 5x10-28ecm
30 nedm Conclusion & Outlook
31 arxiv: v1 [nucl-ex] (16 May 2007) Neutron mirror neutron oscillations (byproduct from R&D program at ILL for nedm experiment) Accepted for Phys. Rev. Lett. τnn > 1 s τnn > 103 s (95% C.L.)
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