Finned Tube to increase target density?

1
Finned Tube to increase target density?
Ciullo G.

• Openable cell for p?p?
• Ideas to increase cell thickness
• Test on the finned Injection Tube

2
The openable cell
Injection Tube

• Openable Cell to inject pbar _at_ AD
• Y 100, x 50 mm
• Closed cell, square 10x10 mm, 5 mm teflon foil.

Sampling tube
3
Estimation of the target thickness

• Thickness (tc) of the cell
• tc atom/cm2
• Cell Geometry square 10x10 mm, length 400 mm
• IHERMES-ABS 6.5 1016at/s then tc8.81
  1013at/cm2
• Some ideas appear in order to increase tc?!

3,94
5,83
1,04
3,94
4
Lower conductance thicker Target

• Lowering the ABS injection Tube Temperature

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Lower conductance thicker Target

• Longer ABS injection Tube

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Lower conductance thicker Target

• ABS injection Tube with fins

Incoming atoms
Outcoming atoms
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Finned tubes
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Test on the finned tubes
Q (Pcal-P cv) Ccal
(Pcv-P RF) Ccv
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Measure of Ccal

• Misura di Ccal
• Evacuazione di Vcal da Ccal

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Measured of Q calibrated
Q calibration curve derived for all finned tubes
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Fixing in mind problems

• We can measure
• The Qincoming is well
• calibrated measurement
• Then derive the tc
• To derive the tc, from data
• We need Qincaming (2)
• And
• Coutcoming (30)

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I measured and see MC simulation
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Surviving atomic beam
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Ccv measured and calculated
Next step use the baratron to measure PCV ?!
15
Thickenss of the cell
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Conclusions

• To increase the target density
• Lower temperature of ABS injection tube
• Mechanical complication and vibrations.
• Longer tube
• Test on the recombination and transport required?
• Finned tube
• Due to the azimuthal motion of the focused atomic
  beam
• Reduced target thickness.