1. new straw end plug: D=10.6 mm straws support frame Levan option
30-May-18
Sector prototype
Prototype common view
Slava option
new straw end plug: D=10.6 mm
straws support frame
Levan option
Plans, work sharing
Discussion
Presented by S.Movchan
30-May-18
S.Movchan Straw status
S.Movchan

2. Straw length Free flange - Console!!! Fixed flange 30-May-18
S.Movchan Straw status
S.Movchan

3. 30-May-18
Common view
30-May-18
S.Movchan Straw status
S.Movchan

4. CERN and Dubna sectors (proposal)
30-May-18
CERN and Dubna sectors (proposal)
Dubna sector
CERN sector
Dubna sector
Flange thickness h=25 mm
Slava ANSYS results – only for h=40 mm
Slava request: h=30 mm (due to straw end plug L=30 mm)
30-May-18
S.Movchan Straw status
S.Movchan

5. Smaller flange view inside vacuum tank
30-May-18
Smaller flange view inside vacuum tank
CERN sector
Dubna sector
30-May-18
S.Movchan Straw status
S.Movchan

6. 30-May-18
Vacuum sylphon
30-May-18
S.Movchan Straw status
S.Movchan

7. Slava option (straw glue like into CREAM)
30-May-18
S.Movchan Straw status

8. Slava option: D1=10.6 mm and D2=10.4 mm
30-May-18
Slava option: D1=10.6 mm and D2=10.4 mm
Slava option: D1=10.6 mm
L= 30 mm
30-May-18
S.Movchan Straw status
S.Movchan

9. Slava option: straws support frame
30-May-18
Slava option: straws support frame
Rohacell
30-May-18
S.Movchan Straw status
S.Movchan

10. Straws support frame: holes shape
30-May-18
Straws support frame: holes shape
Beam
Ø1 = 10.8 mm - for straw insertion
Ø2 = 9.9 mm - for straw positioning
30-May-18
S.Movchan Straw status
S.Movchan

11. Levan option Straw with different diameters can be used! 30-May-18
S.Movchan Straw status
S.Movchan 11

12. Levan option: schematic view of a straw elements
30-May-18
Levan option: schematic view of a straw elements
30-May-18
S.Movchan Straw status
S.Movchan 12

13. Levan option: set of end plugs
30-May-18
S.Movchan Straw status 13

14. Straw o-ring sealing: vacuum test result
30-May-18
Straw o-ring sealing: vacuum test result
The vacuum test was showed that with the use of the rubber O-rings for vacuum sealing of the single straw in the chamber the average gas leakage value is:
cm3 /min
(without straw)
30-May-18
S.Movchan Straw status
S.Movchan 14

15. Levan option: straw pre-tension by spring
30-May-18
Levan option: straw pre-tension by spring
30-May-18
S.Movchan Straw status
S.Movchan 15

16. Plans Set of prototype drawing April/May
Sector prototype production May
40 straw prod. at Dubna and delivery to CERN June
32 CERN straws assembly June
32 Dubna straws assembly July
Vacuum test July-August
Anode wire crimping and tension measurement August
WEBs and gas manifolds assembly August
Front-end integration September
Prototype install., consol adjustment, survey end of September
DAQ, grounding, front-end noise optimization October
Start up October
Beam test start October
30-May-18
S.Movchan Straw status

17. Work sharing (proposal)
30-May-18
S.Movchan Straw status

18. Items for discussion:
Final geometry of single straw view (introduce or not gap between
neighboring straw rows (h=1 mm) for straws support
structure (for wires)?)
Flange thickness: h=30 mm instead h=25 mm
Groves on flanges back side – for what needed (if straws will be
not installed?)
Model of the gas manifold cell is needed (assembly procedure,
cell fixation to flange, WEB fixation, gas inlets and outlets,
pressure sensor and safety valve, …)
Model of Photon Veto tank is needed
WEB final design is needed (model or drawing)
Sector prototype straw geometry alignment and check (modern method
and devises)
Consol adjustment
Prototype survey
30-May-18
S.Movchan Straw status

19. Gas manifold: complicate angle grooves shape and narrow gap
Very narrow
gap: s=0.66 mm
Complicate shape
30-May-18
S.Movchan Straw status

20. Slava ANSYS result exist only for h=40 mm
Thickness h=40 mm
30-May-18
S.Movchan Straw status

21. For what this groove needed?
30-May-18
S.Movchan Straw status

22. for discussion
30-May-18
S.Movchan Straw status