status of the lepta project · 2008. 11. 17. · goals of the lepta • particle dynamics in lepta...
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Status of The LEPTA Project
V.Bykovsky, A.Kobets, V.LokhmatovV.Malakhov, I.Meshkov,
V.Pavlov, R.Pivin, A.Rudakov,
A.Sidorin, A.Smirnov, G.Trubnikov, S.Yakovenko
JINR, Dubna
2
Contents1.LEPTA facility
2.LEPTA development
3.Results
4. For conclusion: The nearest plans
A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
3
septum
kicker
cooling section
positroniumdetector
positron trap
1. LEPTA Facility
22Na→106 e+ per sec
10 6×100sec=10 8e +
10 4 Ps per sec
e-gun
collector
Helical quadrupoleO-Ps
A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
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Project Parameters of The LEPTACircumference , m 17.2
Positron energy, keV 10.0Revolution time, ns 300Longitudinal magnetic field, G 400Average radius of the toroidal
magnets, m 1.45
Helical quadrupole
gradient, G/cm 10.0Positron beam radius, cm 0.5Number of positrons in the ring 1⋅108
Residual gas pressure, Тоrr <
1⋅10−10
Positronium
beam parametersIntensity, atom/s 1⋅104
Angular spread, mrad 1Velocity spread 1⋅10−4
Beam diameter at the exit of the ring,
cm 1.1
1. LEPTA Facility (Contnd)
A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
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Goals of the LEPTA
•
Particle dynamics in LEPTA•
Electron cooling of positrons
•
Positronium
generation in flight•
Feasibility studies of
antihydrogen
generation in
flight•
Experiments on Positronium
physics
1. LEPTA Facility (Contnd)
A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
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2. LEPTA Development
Disassembling
A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
7A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
Reanimation of return current rodsDecember 2006
Contact copper wires
2. LEPTA Development (Contnd)
8A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
2. LEPTA Development (Contnd)
1. Reconstruction of return current rods
9A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
2. LEPTA Development (Contnd)
2. Construction of new magnetic shields
3. Reconstruction of bending field current bars
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Helical quadrupoleElectron
gun
Vertical PUHorizontal PU
Diaphragm
Kicker
SeptumDiaphragm
2. LEPTA Development since Sept.2005 (Contnd)
Vertical PUHorizontal PU
A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
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0 2 4 6 8 100
5
10
15
20
25
Life time [ms]
Energy, keV
B = 350 G B = 510 G P = 7⋅10-8
March 2005
3. Results
March 2005
A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
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LifeTime vs Energy
0
10
20
30
40
50
60
70
80
1 3 5 7 9Energy, keV
Life
Tim
e, m
470G
LifeTime vs Energy
0
10
20
30
40
50
60
70
80
1 3 5 7 9Energy, keV
Life
Tim
e, m
2008 year400G
LifeTime vs Energy
0
10
20
30
40
50
60
70
80
1 3 5 7 9Energy, keV
Life
Tim
e, m
510G
LifeTime vs Energy
0
10
20
30
40
50
60
70
80
1 3 5 7 9Energy, keV
Life
Tim
e, m
2005 year
400G 510G
3. Results (Contnd) June 2008
A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
13A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
Magnetic field modeling at solenoid junctions3. Results (Contnd)
ΔB/B ≈
20%
ΔB/B ≈
12,5%
ΔB/B ≈
2,5%
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Vacuum improvement
Ti evaporation getters
3. Results (Contnd)
We heartily thank our colleagues from Budker INP, especially Leonty Mironenko, for providing us with the getter pumps
A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
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Electron gun
Cooling electron beam transportation to the collector channelin pulsed mode operation
3. Results (Contnd)
Luminescent screen
A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
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4. Conclusion
Nearest plans
1. Test and tuning of electron cooling system with continuous electron beam
2. Assembling of the positron injector and test the ring with positrons
3. Electron cooling of positrons and Positromium generation
A.Kobets Status of The LEPTA Project RUPAC’08, Zvenigorod Russia
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