1 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 1 Decay Tube &...

111/11/2003NBI 2003 - Decay Tube and Windows

Presentation by Ans Pardons 1

Decay Tube & WindowsDecay Tube & Windows

Introduction (Location, Planning)

Decay Tube

Entrance Window

Exit Window

Vacuum System

LocationLocation

Decay tubeDecay tubeSleeves Sleeves

Exit WindowExit Window

StoreStore

LocationLocation

PumpsPumps FlangeFlange

Decay tube Decay tube InstallInstall

InstallInstallInstallInstall

LocationLocation

PumpsPumps

Decay tube Decay tube

Entrance Entrance WindowWindow

InstallInstall

PlanningPlanning

Transport Exit Window& Storage in Hadron StopInstall Decay Tube (November 2003 -May 2004)

October

Vent Decay TubeInstall Entrance Window & FlangesBring back to vacuum

January

Install Vacuum PumpsInstall Exit WindowInstall Temporary Entrance FlangeBring Decay Tube to Vacuum

August

20032004

20052006

Decay TubeDecay Tube

Decay Tube:Internal diameter of 2.45m, 998m long, 18mm thick

Made of carbon steel

Vacuum 1 mbar

Decay Tunnel:Internal diameter of 3.5m, 992m long, slope of 5.6%

Supported by shotcrete

Decay Tube Sleeves:6m long (2x3m, welded)

Will be combined to 18m long sleeves in target cavern

Decay Tube: TransportDecay Tube: Transport

Transported from surface to target cavern

Mechanical workshop in target cavern

3x6m sleeves welded 18m

Top View

To decay tube

Decay TubeDecay Tube

3 x 6m-sleeves on surface 3 x 6m-sleeves in target chamber

1x18m-sleeve in target chamber

Decay Tube: InstallationDecay Tube: Installation

3 fixed supports4x10t jacks

Lifting beam

4 top supports

concrete

welded & checked

Decay Tube: Quality ControlDecay Tube: Quality Control

Plates / PipesDimensions, chemical analysis, mech. characteristics 100% Ultrasonic test 20%

Contractor - Independent Control Agency - CERN

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

Entrance WindowEntrance Window

2mm Titanium window

Minimize particle loss Thin

Entrance Window: SafetyEntrance Window: Safety

Installation

Temporary Flange

FE calculations ok, no active cooling neededX-ray & pressure test 3 bar ok

Safety during access(vent if doubt)

Rupture?

Shut Down

Window + Shutter

Nearestperson

But what if rupture during beam?

1barReduced X-sectionsPits as buffer

SafetyPressure drop <0.5barWind speed <<5m/s

Problem?

FE-ModelRupture D=1.7m (full)Rupture D=0.5m

ResultsPressure drop

Windspeed 36m/s10m/s

2200Pa200Pa

Solution…

High-velocity zone moved

Use ventilation to balance pressure (pressure losses in ducts)

e.g. 2200Pa, allow 50m/s Duct of D=0.45m, takes 10 mins

Sufficient? More calculations Other ideas

Exit Window LocationExit Window Location

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

Lower energy particles Thick

Exit Window: InstallationExit Window: Installation

Oct-03

Aug-04

Exit Window: InstallationExit Window: Installation

Oct-03

Vacuum SystemVacuum System

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

Vacuum Pumps

1 11/11/2003 NBI 2003 - Decay Tube and Windows Presentation by Ans Pardons 1 Decay Tube &...

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