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

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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

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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

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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

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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