16-May-2002 Weak Interaction Trap for CHarged particles
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INSTITUUT VOOR KERN- EN STRALINGSFYSICA
WI Te +
WITCH:
Physics goals and Present Status
Valentin Kozlov
FANTOM study week, 13-17 May, Paris
16-May-2002 Weak Interaction Trap for CHarged particles
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WITCH team
Outsideworld
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
16-May-2002 Weak Interaction Trap for CHarged particles
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Overview
1. Physics motivation
2. Principle of experiment
3. Experimental set-up
4. Expected results
5. Current status
16-May-2002 Weak Interaction Trap for CHarged particles
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Physics motivation
Weak Interactions: ..int chHHHHH ATVS
0'' TTSS CCCCStandard Model: V-A interaction
08.0V
SC
C13.0V
TC
C 95%CL
e+
e
nucleus
)cos(1)( c
vaW
2
2'2
1V
SS
C
CCa
pure Fermi decay
- correlation:
16-May-2002 Weak Interaction Trap for CHarged particles
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WITCH principle
ScalarVector +
e Recoil energy !
+
e
Scalar Vector
1a 1a
Recoil energy spectrum (eV)5004003002001000
1
0.8
0.6
0.4
0.2
Recoil energy (eV)
16-May-2002 Weak Interaction Trap for CHarged particles
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Penning trap
zeBB
Radial confinement by the homogeneous magnetic field
22
20
2
1
2),( zr
d
UzrU
Axial confinement by an electrostatic quadrupole field
Ion motion in Penning trap:
16-May-2002 Weak Interaction Trap for CHarged particles
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Retardation
!! probes velocity component parallel to electric field !!
conversion of radial into longitudinal kinetic energy necessary
decay trap in 9T –fieldRetardation in 0.1T field
0
1
0
1
B
B
E
Ekin
kin
Magnetic field gradient
retardation
counter
retardationpotential
16-May-2002 Weak Interaction Trap for CHarged particles
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Experimental set-up
%1.19
1.0
0
1
0
1
T
T
B
B
E
Ekin
kin
Energy conversion
High field Magnet (9T)
Low field Magnet (0.1T)
detectorpost-acceleration
einzellens
retardationelectrodes
decaytrap
coolertrap
-detector
16-May-2002 Weak Interaction Trap for CHarged particles
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Charged states
It is possible to measure the charged state distribution!
16-May-2002 Weak Interaction Trap for CHarged particles
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Spectrum
16-May-2002 Weak Interaction Trap for CHarged particles
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Precision
95%CL0.09,CC0.5%Δa VS
95%CL0.06,CC0.2%Δa VS
107105
16-May-2002 Weak Interaction Trap for CHarged particles
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20012000 2002 200319991998
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
16-May-2002 Weak Interaction Trap for CHarged particles
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Photo gallery
Vertical beamline
Magnet systemSupport structure
Magnet system
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