1. INSTITUUT VOOR KERN- EN STRALINGSFYSICA 16-May-2002Weak Interaction Trap for CHarged particles1 WITCH: Physics goals and Present Status Valentin Kozlov FANTOM study week, 13-17 May, Paris

2. 16-May-2002Weak Interaction Trap for CHarged particles2 WITCH team Outside world F. Ames, D. Beck, G. Bollen, J. Deutsch, J. Dilling, O. Forstner, W. Quint, and the NIPNET Collaboration Axel, Bavo, Marcus, Nathal and Valentin Il’ya, Stefan, Titia and Victor KO

3. 16-May-2002Weak Interaction Trap for CHarged particles3 Overview 1. Physics motivation 2. Principle of experiment 3. Experimental set-up 4. Expected results5. Current status

4. 16-May-2002Weak Interaction Trap for CHarged particles4 Physics motivation Weak Interactions:Standard Model: V-A interaction 95%CL e+e+ e nucleus  pure Fermi decay  - correlation:

5. 16-May-2002Weak Interaction Trap for CHarged particles5 WITCH principle ScalarVector ++ e Recoil energy ! ++ e Scalar Vector Recoil energy spectrum (eV)

6. 16-May-2002Weak Interaction Trap for CHarged particles6 Penning trap Radial confinement by the homogeneous magnetic field Axial confinement by an electrostatic quadrupole field Ion motion in Penning trap:

7. 16-May-2002Weak Interaction Trap for CHarged particles7 Retardation !! probes velocity component parallel to electric field !! conversion of radial into longitudinal kinetic energy necessary decay trap in 9T –field Retardation in 0.1T field Magnetic field gradient retardation counter retardation potential

8. 16-May-2002Weak Interaction Trap for CHarged particles8 Experimental set-up Energy conversion High field Magnet (9T) Low field Magnet (0.1T) detector post-acceleration einzellens retardation electrodes decay trap cooler trap  -detector

9. 16-May-2002Weak Interaction Trap for CHarged particles9 Charged states It is possible to measure the charged state distribution!

10. 16-May-2002Weak Interaction Trap for CHarged particles10 Spectrum

11. 16-May-2002Weak Interaction Trap for CHarged particles11 Precision 10 7 10 5

12. 16-May-2002Weak Interaction Trap for CHarged particles12 200120002002200319991998 Decision making & design study Calculations and simulations Installation horiz. beamline Inst. Platforms + support Inst. Last part Commissioning First test exp. Control system creating Current status

13. 16-May-2002Weak Interaction Trap for CHarged particles13 Photo gallery Vertical beamline Magnet system Support structure Magnet system