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

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

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

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

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

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

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

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

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

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

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

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

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

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: 0.0004 cm3 /min (without straw) 30-May-18 S.Movchan Straw status S.Movchan 14

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

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 12 October Beam test start 17 October 30-May-18 S.Movchan Straw status

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

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

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

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

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

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