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By the Target Working Group Presented by L.Bruno AB/ATB Targets & Dumps Section

The CNGS Target Station Technical Study. By the Target Working Group Presented by L.Bruno AB/ATB Targets & Dumps Section. The CNGS Target Station. OUTLINE 1. Introduction 2. Shielding 3. Target Unit 4. Structural issues 5. Summary. Introduction

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By the Target Working Group Presented by L.Bruno AB/ATB Targets & Dumps Section

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  1. The CNGS Target Station Technical Study By the Target Working Group Presented by L.Bruno AB/ATBTargets & Dumps Section

  2. The CNGS Target Station OUTLINE 1. Introduction 2. Shielding 3. Target Unit 4. Structural issues 5. Summary

  3. Introduction (that is, what I will say and what I will NOT…) Subjects covered in previous workshops • Driving parameters • Conceptual design philosophy • Target configuration and optimization • Subjects covered in THIS workshop • Engineering design of the shielding • Engineering design of the target • New issues and developments

  4. Target assembly Layout - Vertical view Target enclosure Horn limit Crane limit Shield Steel frame Proton beam Horiz. Base plane Fixed structure “Handled” structure

  5. Layout - Front view Iron shield Passage side Cavern side Cap No access marble Side wall Side wall Side wall Proton beam Target enclosure800x1400x3200mm3 Base

  6. Unit exchange mechanism Target handling Fiducials Beam Alignment table Collimator Base table BPKG monitor

  7. Mobile shielding cap Manual Coupling Quick disconnect Guiding rail Flat rail Passage side Cavern side

  8. Rail transition Mobile shielding – Top view Switches Threaded shafts Motor Jacks Beam Target magazine BPKG Collimator Rail sections

  9. Mobile shielding – Side view Coupling Slope 0.5% Horizontal Motor Beam

  10. Target AlignmentCourtesy of D.Missiaen Alignment is based on: • 2horizontal bars for : • transversal alignment • raw vertical alignment • 2 verticalback-upbars used for accuratevertical alignment Bars are: • removable • equipped with fiducials • equipped with clinometer • ~1.2÷1.8 m long • inclin. < 0.05/5 mrad (H/V) • provided with an horizontalizationsystem Passage side Cavern side No access Base Proton beam

  11. Alignment by the horizontal bars Courtesy of D.Missiaen Vertical measurementsperformed by means of an optical level using a deep reference and/or the adjacent components. Accuracy is not better than 0.15mm because of the bar inclination. Horizontal measurementsDone by a motorized tacheometer driven by a PC. The operator is far from the area. Accuracy is in the range of 0.1 mm. The operator has to install and level the bar in a radioactive area (short time). Note: vertical measurements can be improved to better that 0.1 mm accuracy by using the vertical bars. Access to the radioactive top shielding is restricted to long shut-downs PC-driven tacheometer

  12. Unit exchange mechanism Target handling Fiducials Beam Alignment table Collimator Base table BPKG monitor

  13. Target unit The target unit is conceived as a static sealed system filled with inert gas. The tube has annular fins to enhance convective heat transfer. Light materials are used to limit the heat load. End cap DownstreamWindow Sealed finned tube Inert gas Target Support Central tube End cap MATERIALS Tube: Al-Mg alloy Windows: Be by Brush & Wellman Target Support: Carbon Fiber reinforced Carbon Target rod: Fine-grain graphite hexagonal boron nitride, CFC UpstreamWindow

  14. Unit Windows EB weld Be-Al joint B&W Bewindow(Ø1.5”) B&W Be window (Ø4”) Beam Aluminium alloy 5083 St.Steel

  15. Upstream end cap “Pinch-off” Inner support Helicoflex C-C Support Structure

  16. Central Tube Outer support Outer support Inner supports A-A B-B Reference surface B-B A-A

  17. Carbon Support Structure Common ref.surface Traversing rod supports Cooling apertures Inner supports

  18. Target elements – a new issue New additional studies performed by an analytical model point out that… If the target unit is cold (start-up)… and a first proton spill of ultimate intensity… hits the target with the worst misalignment…  followed by a second, similarly misaligned spill… and stresses add up in the worst way , Then…

  19. Maximum total stress [MPa] in a 2020PT graphite target rod … unacceptable stresses are found

  20. Target Material

  21. Summary Status in November 2003 The detailed design of the target station is being worked out; The choice of thealignment procedureis being finalized; The target assembly is being optimized (manufacturing, integration,…) The interfaces for handling, cooling, beam instrumentation and alignment are being defined. The worst-case stresses are presently an issue.

  22. Twg Twg Conceptual design Twg Engineering study Technical study 1st Review Manufacturing 2nd Review Installation Planning overview 2001 2005 2003 2002 2004

  23. Target element

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