lepta project measuring lifetime of positrons laboratory of nuclear problems
DESCRIPTION
LEPTA project Measuring lifetime of positrons Laboratory of nuclear problems Supervisor: S.Yakovenko JINR, Dubna. Goals of the LEPTA project. Dynamics of coupling motion in the stellatron Electron cooling of positrons Positronium generation in flight Positronium physics - PowerPoint PPT PresentationTRANSCRIPT
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LEPTA project
Measuring lifetime of positronsLaboratory of nuclear problems
Supervisor: S.Yakovenko
JINR, Dubna
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Goals of the LEPTA project
• Dynamics of coupling motion in the stellatron
• Electron cooling of positrons
• Positronium generation in flight
• Positronium physics
• Electron cooling with circulating electron beam
• Feasibility study of antihydrogen generation in flight
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septum
kicker
cooling section
positronium detector
positron trap
Design of the LEPTA
22Na106 e+ per sec
10 6100sec=10 8 e +
10 4 Ps per sec
e-gun
collector
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General parameters of the ringCircumference , m 17.2
Particle energy, keV 1 - 10
Longitudinal magnetic field, G 300 - 1000
Radius of the toroidal solenoids, m 1.45
Helical quadrupole gradient, G/cm 0 - 20
Length of the helical quadrupole, m and number of steps of the helix
1.62
Number of positrons in the ring 1*108
Residual gas pressure, Тоrr 1*10-10
Design of positronium beam parameters
Intensity, atom/s 110
Angular spread, mrad 1
Velocity spread 1104
Beam diameter at the exit of the ring, cm 1.1
Positronium decay length, m 8.52
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Beam diagnostic tools and correction coils disposition
Horizontal PU
kicker
Helical quadrupole
Electron gun
Vertical PU
DL
D = 79 mm, L = 126 mm
Vertical PU
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Beam lifetime
10 µs
“Killer” pulse wasapplied to the kicker plate
signal from PU
y = 74,962e-0,1728x
1
10
100
0 2 4 6 8 10 12
time, msec
U,
mV
Our results:
Lifetime: 5,787037 ms