Decay Tube Windows Introduction Location Planning Decay Tube
Decay Tube & Windows Introduction (Location, Planning) Decay Tube Entrance Window Exit Window Vacuum System 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 1
Location Decay tube Sleeves Store Exit Window 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 2
Location Install Flange Install Pumps Decay tube Install Exit Window 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 3
Location Install Entrance Window Pumps Decay tube Exit Window 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 4
Planning NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 2006 11/11/2003 2005 January Vent Decay Tube Install Entrance Window & Flanges Bring back to vacuum 2004 August Install Vacuum Pumps Install Exit Window Install Temporary Entrance Flange Bring Decay Tube to Vacuum 2003 October Transport Exit Window & Storage in Hadron Stop Install Decay Tube (November 2003 -May 2004) 5
Decay Tube Decay Tunnel: Internal diameter of 3. 5 m, 992 m long, slope of 5. 6% Supported by shotcrete Decay Tube: Internal diameter of 2. 45 m, 998 m long, 18 mm thick Made of carbon steel Vacuum 1 mbar Decay Tube Sleeves: 6 m long (2 x 3 m, welded) Will be combined to 18 m long sleeves in target cavern 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 6
Decay Tube: Transported from surface to target cavern Mechanical workshop in target cavern Top View To decay tube 3 x 6 m sleeves welded 18 m 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 7
Decay Tube 3 x 6 m-sleeves on surface 11/11/2003 3 x 6 m-sleeves in target chamber NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 1 x 18 m-sleeve in target chamber 8
Decay Tube: Installation 4 top supports Lifting beam 4 x 10 t jacks 3 fixed supports winch welded & checked concrete 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 9
Decay Tube: Quality Control Contractor - Independent Control Agency - CERN Plates / Pipes Dimensions, chemical analysis, mech. characteristics Ultrasonic test Welds Visual Inspection Ultrasonic test Dye-Penetrant X-Rays Workshop * 100% 85% 100% 15%** 100% 20% Decay Tunnel * 100% --- Tightness test of Decay tube - At the end of the works * %=percentage of weld length checked **X-rays check all welds not checked by ultrasound 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 10
Entrance Window Minimize particle loss Thin 2 mm Titanium window 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 11
Entrance Window: Safety FE calculations ok, no active cooling needed X-ray & pressure test 3 bar ok Rupture? Installation Temporary Flange Shut Down Window + Shutter 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons Safety during access (vent if doubt)12
Entrance Window: Safety But what if rupture during beam? Safety Pressure drop <0. 5 bar Wind speed <<5 m/s Nearest person 1 bar 1 mbar Problem? 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons FE-Model Rupture D=1. 7 m (full) Rupture D=0. 5 m Reduced X-sections Pits as buffer Results Pressure drop Windspeed 2200 Pa 36 m/s 10 m/s 13
Entrance Window: Safety Solution… Sufficient? More calculations Other ideas 11/11/2003 Use ventilation to balance pressure (pressure losses in ducts) High-velocity zone moved e. g. 2200 Pa, allow 50 m/s Duct of D=0. 45 m, takes 10 mins NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 14
Exit Window Location 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 15
Exit Window Lower energy particles Thick 50 mm Carbon Steel Avoid high temperatures (beam dump: uncontrolled area, no access) FE calculations not safe (beam dump cooling: extra circuit easy to add) Active cooling 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 16
Exit Window 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 17
Exit Window: Installation Oct-03 Aug-04 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 18
Exit Window: Installation 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons Oct-03 19
Vacuum System 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 20
Vacuum System Vacuum Pumps with air cooling or independent cooling circuit Dry pumps no oil no duct needed for exhaust Principle of Dry Pump 2 identical pumps of 250 m 3/h 3 days pumping to obtain 1 mbar in decay tube 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 21
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