1. 29 ottobre 2007Torporkov visit Finned Tube to increase target density? Openable cell for p p Ideas to increase cell thickness Test on the finned Injection Tube Ciullo G.

2. 29 ottobre 2007Torporkov visit The openable cell Openable Cell to inject p bar @ AD Y = 100, x = 50 mm Closed cell, square 10x10 mm, 5 m teflon foil. Sampling tube Injection Tube

3. 29 ottobre 2007Torporkov visit Estimation of the target thickness Thickness (t c ) of the cell t c [atom/cm 2 ] Cell Geometry: square 10x10 mm, length 400 mm –I HERMES-ABS = 6.5 10 16 at/s then t c =8.81 10 13 at/cm 2 Some ideas appear in order to increase t c ?! 3,94 5,83 1,04

4. 29 ottobre 2007Torporkov visit Lower conductance thicker Target Lowering the ABS injection Tube Temperature

5. 29 ottobre 2007Torporkov visit Lower conductance thicker Target Longer ABS injection Tube

6. 29 ottobre 2007Torporkov visit Lower conductance thicker Target ABS injection Tube with fins Incoming atoms Outcoming atoms

7. 29 ottobre 2007Torporkov visit Finned tubes

8. 29 ottobre 2007Torporkov visit Test on the finned tubes Q = (P cal -P cv ) C cal = (P cv -P RF ) C cv

9. 29 ottobre 2007Torporkov visit Measure of C cal Misura di C cal Evacuazione di V cal da C cal

10. 29 ottobre 2007Torporkov visit Measured of Q calibrated Q calibration curve derived for all finned tubes

11. 29 ottobre 2007Torporkov visit Fixing in mind problems We can measure –The Q incoming is well calibrated measurement –Then derive the t c To derive the t c, from data »We need Q incaming (2%) And »C outcoming (30%)

12. 29 ottobre 2007Torporkov visit I measured and see MC simulation

13. 29 ottobre 2007Torporkov visit Surviving atomic beam

14. 29 ottobre 2007Torporkov visit C cv measured and calculated Next step: use the baratron to measure P CV ?!

15. 29 ottobre 2007Torporkov visit Thickenss of the cell

16. 29 ottobre 2007Torporkov visit 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.