Technical Study By t he Target Working Group L. Bruno Present ed - - PowerPoint PPT Presentation

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Technical Study By t he Target Working Group L. Bruno Present ed - - PowerPoint PPT Presentation

Jan 21, 2023 116 likes •358 views

The CNGS Target Station Technical Study By t he Target Working Group L. Bruno Present ed by Targets & Dumps Section AB/ ATB NBI 2003 CNGS Target St at ion 7-11 November 2003 1 Present at ion by L.Bruno (CERN AB/ ATB) The CNGS

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By t he Target Working Group Present ed by

  • L. Bruno

AB/ ATB

Targets & Dumps Section

The CNGS Target Station

Technical Study

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The CNGS Target Station

OUTLI NE

  • 1. I ntroduction
  • 2. Shielding
  • 3. Target Unit
  • 4. Structural issues
  • 5. Summary
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I ntroduction

(t hat is, what I will say and what I will NOT… )

Subjects covered in previous workshops

  • Driving parameters
  • Conceptual design philosophy
  • Target conf iguration and optimization

Subjects covered in THI S workshop

  • Engineering design of the shielding
  • Engineering design of the target
  • New issues and developments
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Target enclosure Shield Crane limit Horn limit

  • Horiz. Base

plane Target assembly Steel f rame

Proton beam

Layout - Vertical view

Fixed st ruct ure “Handled” st ruct ure

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Layout - Front view

Passage side Cavern side

Target enclosure 800x1400x3200 mm3

marble Side wall

No access Cap

Side wall Side wall

Base I ron shield Proton beam

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Target handling

Alignment table Base table

Unit exchange mechanism

Collimator BPKG monitor Fiducials

B e a m

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Mobile shielding cap

Flat rail Guiding rail

Passage side Cavern side Manual Coupling

Quick disconnect

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Mobile shielding – Top view

Switches

Threaded shaf ts Jacks

Beam

Rail transition

Target magazine BPKG Collimator Motor Rail sections

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Mobile shielding – Side view

B e a m

Slope 0. 5%

Coupling

Horizontal

Motor

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Target Alignment

Court esy of D.Missiaen

Passage side Cavern side

No access Base Proton beam

Alignment is based on:

2 horizontal bars f or : t ransversal alignment raw vert ical alignment 2 vertical back- up bars used f or accurat e vert ical alignment Bars are: removable equipped wit h f iducials equipped wit h clinomet er ~1.2÷1.8 m long

  • inclin. <

0.05/ 5 mrad (H/ V) provided wit h an horizont alizat ion syst em

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Alignment by the horizontal bars

Court esy of D.Missiaen

Vertical measurements perf ormed by means of an opt ical level using a deep ref erence and/ or t he adj acent component s. Accuracy is not bet t er t han 0.15mm because of t he bar inclinat ion. Horizontal measurements Done by a mot orized t acheomet er driven by a PC. The

  • perat or is f ar f rom t he area. Accuracy is in t he

range of 0.1 mm. The operat or has t o inst all and level t he bar in a radioact ive area (short t ime). Not e: vert ical measurement s can be improved t o bet t er t hat 0.1 mm accuracy by using t he vert ical

  • bars. Access t o t he radioact ive t op shielding is

rest rict ed t o long shut -downs

PC- driven tacheometer

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Target handling

Alignment table Base table

Unit exchange mechanism

Collimator BPKG monitor Fiducials

B e a m

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Downstream Window Target Support Sealed f inned tube I nert gas E n d c a p End cap Upstream Window

The target unit is conceived as a static sealed system f illed with inert gas. The tube has annular f ins to enhance convective heat transf er. Light materials are used to limit the heat load. MATERI ALS Tube: Al- Mg alloy Windows: Be by Brush & Wellman Target Support: Carbon Fiber reinf orced Carbon Target rod: Fine- grain graphite hexagonal boron nitride, CFC

Central tube

Target unit

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Unit Windows

Aluminium alloy 5083 B & W B e w i n d

  • w

(Ø1. 5”)

Beam EB weld Be- Al joint B & W B e w i n d

  • w

(Ø4”)

  • St. Steel
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Upstream end cap

I nner support C- C Support Structure “Pinch- of f ” Helicof lex

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Central Tube

I nner supports

A- A B- B A- A B- B

Outer support Outer support Ref erence surf ace

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Carbon Support Structure

Cooling apertures Common ref . surf ace Traversing rod supports I nner supports

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Target elements – a new issue

New addit ional st udies perf ormed by an analyt ical model point out t hat …

  • I f t he t arget unit is cold (st art -up)…
  • and a f irst prot on spill of ult imat e int ensit y…
  • hit s t he t arget wit h t he worst misalignment …
  • f ollowed by a second, similarly misaligned spill…
  • and st resses add up in t he worst way ,

Then…

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Maximum total stress [MPa]

in a 2020PT graphit e t arget rod

…unaccept able st resses are f ound

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Target Material

hBN

13 26 39 52 65 78 200 400 600 800 1000

Temperature [°C] Young M. [GPa] / σt [MPa]

  • 1

1 2 3 4 5

Cp [kJ/kg°C] α [µm/m °C]

α┴ cp E σ4P α||

Graphite

13 26 39 52 65 78 200 400 600 800 1000

Temperature [°C] Young M. [GPa] / σt [MPa]

  • 1

1 2 3 4 5

Cp [kJ/kg°C] α [µm/m °C]

α cp E σ4P

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Summary

Status in November 2003

1. The detailed design of the target station is being worked out; 2. The choice of the alignment procedure is being f inalized; 3. The target assembly is being optimized (manuf acturing, integration, … ) 4. The interf aces f or handling, cooling, beam instrumentation and alignment are being def ined. 5. The worst- case stresses are presently an issue.

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Planning overview

Twg Twg Twg

1st Review

I nstallation Manuf acturing Technical study Engineering study

2nd Review

Conceptual design

2001 2002 2003 2004 2005

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Target element