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High-Precision Measurement: g-Factor of Single Antiproton in Cryogenic Trap

This project outlines the B.A.S.E. experiment aiming to measure the g-factor of a single antiproton stored in a cryogenic Penning trap with unprecedented precision. The magnetic moment of the antiproton is crucial for understanding fundamental symmetries in physics. The experiment utilizes cyclotron motion and Larmor precession to determine the g-factor by measuring frequency ratios in a Penning trap. The project involves advanced techniques such as superposition of magnetic and electrostatic fields, frequency measurements, and the Stern-Gerlach effect. Progress includes the design of the Penning trap, electronics development, and cryogenics setup. The experiment at CERN is supported by collaborative efforts and funding for further development.

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High-Precision Measurement: g-Factor of Single Antiproton in Cryogenic Trap

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  1. B.A.S.E. Direct High-Precision Measurement of the g-Factor of a Single Antiproton Stored in a Cryogenic Penning Trap Stefan Ulmer RIKEN Advanced Science Institute Klaus Blaum, Kurt Franke, Andreas Mooser, Wolfgang Quint, Georg Schneider, Christian Smorra, Jochen Walz, Yasunori Yamazaki ADUC/ELENA Meeting 11/20/2012 CERN

  2. Outline • Physics Goal of B.A.S.E. • Baryon Antibaryon Symmetry Experiment • B.A.S.E. Collaboration • Status of the experiment – progress report

  3. Context – CPT Tests Currently: Magnetic moment of the antiproton known at relative precision of only 10-3. B.A.S.E. aims at millionfold improvement of antiproton magnetic moment

  4. The Magnetic Moment Every spin carrying charged particle behaves like a tiny bar magnet. The magnetic moment: characterizes its strength Do the magnets in the proton and the antiproton have the same strenghts ?

  5. Principle: g-factor Measurement Cyclotron Motion LarmorPrecession Determination of the g-factor reduces to the determination of a frequency ratio -> in principle a very simple experiment strong proposal for a precision measurement

  6. The Penning Trap Superposition of a homogeneous magnetic field and an electrostatic quadrupolar potential “invariance theorem” makes Penning traps to strong tools for precision experiments FREQUENCIES Axial: 700 kHz Modified Cyclotron: 29 MHz 20 cm Magnetron: 8 kHz B

  7. Frequency Measurements Five simultaneous signals by one single trapped particle Spectrum contains all required frequency information FIRST DIRECT MEASUREMENT OF FREE CYCLOTRON FREQUENCY (Dnc/nc= 5*10-9) S. Ulmer et al.Phys. Rev. Lett 107, 130005 (2011)

  8. The Continuous Stern Gerlach Effect Energy of magnetic dipole in magnetic field Leading order magnetic field correction This term adds a spin dependent quadratic axial potential -> Axial frequency becomes function of spin state - Very difficult for the proton/antiproton system. - Most extreme magnetic conditions ever applied to single particle.

  9. Larmor Frequency Measurement

  10. Results Both experiments measured Larmor frequency at 10-6 level…

  11. B.A.S.E. - Progress

  12. Apparatus 4 Penning Trap Design -> finished and currently at machine shop Electronics -> under development Cryogenics -> Under development Vivid discussion with AD group (L. Bojtar and T. Eriksson) in progress

  13. B.A.S.E.-lab at CERN friendly supported by M. Doser Everything prepared to develop Cryotests First Layout Development

  14. Funding !!! thanks for your attention !!!

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