Decay Tube & Windows Decay Tube & Windows Introduction - PowerPoint PPT Presentation

Decay Tube & Windows Decay Tube & Windows Introduction (Location, Planning) Decay Tube Entrance Window Exit Window Vacuum System NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 1 1 Present at ion by Ans Pardons

Location Location Decay tube Decay tube Store Store Sleeves Sleeves Exit Window Exit Window NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 2 2 Present at ion by Ans Pardons

Location Location Install Install Install Install Flange Flange Pumps Pumps Decay tube Decay tube Install Install Exit Window Exit Window NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 3 3 Present at ion by Ans Pardons

Location Location Install Install Entrance Entrance Window Pumps Window Pumps Decay tube Decay tube Exit Window Exit Window NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 4 4 Present at ion by Ans Pardons

Planning Planning October 2003 Transport Exit Window & Storage in Hadron Stop Install Decay Tube (November 2003 -May 2004) 2004 August Install Vacuum Pumps Install Exit Window Install Temporary Entrance Flange 2005 Bring Decay Tube to Vacuum January Vent Decay Tube 2006 Install Entrance Window & Flanges Bring back to vacuum NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 5 5 Present at ion by Ans Pardons

Decay Tube Decay Tube Decay Tunnel: Internal diameter of 3.5m, 992m long, slope of 5.6% Supported by shotcrete Decay Tube: Internal diameter of 2.45m, 998m long, 18mm thick Made of carbon steel Vacuum 1 mbar Decay Tube Sleeves: 6m long (2x3m, welded) Will be combined to 18m long sleeves in target cavern NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 6 6 Present at ion by Ans Pardons

Decay Tube: Transport Decay Tube: Transport Transported from surface to target cavern Mechanical workshop in target cavern Top View � To decay tube 3x6m sleeves welded � 18m NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 7 7 Present at ion by Ans Pardons

Decay Tube Decay Tube 3 x 6m-sleeves on surface 3 x 6m-sleeves in target chamber NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 8 8 Present at ion by Ans Pardons 1x18m-sleeve in target chamber

Decay Tube: Installation Decay Tube: Installation 4 top supports Lifting beam 4x10t jacks 3 fixed supports winch welded & checked concrete NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 9 9 Present at ion by Ans Pardons

Decay Tube: Quality Control Decay Tube: Quality Control Contractor - Independent Control Agency - CERN Plates / Pipes Dimensions, chemical analysis, mech. characteristics 100% Ultrasonic test 20% Welds Workshop * Decay Tunnel * Visual Inspection 100% 100% Ultrasonic test 85% 100% Dye-Penetrant 100% 100% X-Rays 15%** --- 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 NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 10 10 Present at ion by Ans Pardons

Entrance Window Entrance Window Minimize particle loss � Thin 2mm Titanium window NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 11 11 Present at ion by Ans Pardons

Entrance Window: Safety 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 Safety during access (vent if doubt) NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 12 12 Present at ion by Ans Pardons

Entrance Window: Safety Entrance Window: Safety But what if rupture during beam? Safety Pressure drop <0.5bar Wind speed <<5m/s FE-Model Nearest Rupture D=1.7m (full) person Rupture D=0.5m 1bar Reduced X-sections Pits as buffer 1mbar Results Problem? 2200Pa Pressure drop 200Pa 36m/s Windspeed 10m/s NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 13 13 Present at ion by Ans Pardons

Entrance Window: Safety Entrance Window: Safety Use ventilation to balance pressure Solution… (pressure losses in ducts) Sufficient? � High-velocity zone moved � More calculations e.g. 2200Pa, allow 50m/s � Duct of D=0.45m, takes 10 mins � Other ideas NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 14 14 Present at ion by Ans Pardons

Exit Window Location Exit Window Location NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 15 15 Present at ion by Ans Pardons

Exit Window Exit Window Lower energy particles � Thick 50mm 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 NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 16 16 Present at ion by Ans Pardons

E x i t W i n d o w E x i t W i n d o w NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 17 17 Present at ion by Ans Pardons

E x i t W i n d o w : I n s t a l l a t i o n E x i t W i n d o w : I n s t a l l a t i o n Oct-03 Aug-04 NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 18 18 Present at ion by Ans Pardons

E x i t W i n d o w : I n s t a l l a t i o n E x i t W i n d o w : I n s t a l l a t i o n Oct-03 NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 19 19 Present at ion by Ans Pardons

V a c u u m S y s t e m V a c u u m S y s t e m NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 20 20 Present at ion by Ans Pardons

V a c u u m S y s t e m V a c u u m S y s t e m Vacuum Pumps 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 250m3/h � 3 days pumping to obtain 1mbar in decay tube NBI 2003 - Decay Tube and Windows 11/ 11/ 2003 21 21 Present at ion by Ans Pardons