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PSB dump: proposal of a new design

PSB dump: proposal of a new design. EN – STI technical meeting on Booster dumps. Friday 11 May 2012 BE Auditorium Prevessin Alba SARRI Ó MARTÍNEZ. OUTLINE. Introduction Constraints and d esign choices Proposal of a new design Analyses Conclusions. INTRODUCTION.

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PSB dump: proposal of a new design

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  1. PSB dump: proposal of a new design EN – STI technical meeting on Booster dumps Friday 11 May 2012 BE Auditorium Prevessin Alba SARRIÓ MARTÍNEZ

  2. OUTLINE • Introduction • Constraints and design choices • Proposal of a new design • Analyses • Conclusions

  3. INTRODUCTION • The PSB dump was designed in the 1960’s to cope with beam energies reaching 800 MeV and intensities of 1013 protons per pulse. • Over the past years, the dump encountered some problems, i.e. vacuum and water leaks. • Beam energy and intensity have been periodically increased during the last upgrades. • A new upgrade in beam energy (2 GeV) and beam intensity (1014 particles per pulse) is foreseen for the near future. • Consequently: a new dump is needed to cope with this last upgrade.

  4. CONSTRAINTS  DESIGN CHOICES • Installation and lifetime • Location • Reliability • Access • Loading • Cooling circuit • Material  LS1, LHC’s lifetime. The dump needs to be ready to be installed by August 2013

  5. CONSTRAINTS • Installation and lifetime • Location • Reliability • Access • Loading • Cooling circuit • Material x x

  6. CONSTRAINTS  DESIGN CHOICES • Location: dimension limitations and integration  where the old dump is at present.

  7. CONSTRAINTS • Installation and lifetime • Location • Reliability • Access • Loading • Cooling circuit • Material

  8. CONSTRAINTS  DESIGN CHOICES • Reliability: minimise any risk of failure (avoid encountering the same problems than in the past) • The design has to be as simple as possible (to maximise reliability, to reduce assembly difficulties and to ease manufacturing complexity). • Not to work under vacuum. • Mechanical connections are preferred over welding.

  9. CONSTRAINTS • Installation and lifetime • Location • Reliability • Access • Loading • Cooling circuit • Material

  10. CONSTRAINTS  DESIGN CHOICES • Access: the dump core couldn’t be accessed without a major interruption in the beam availability • no in-situ maintenance can be done • redundancies must be foreseen

  11. CONSTRAINTS • Installation and lifetime • Location • Reliability • Access • Loading • Cooling circuit • Material

  12. CONSTRAINTS • Loading

  13. CONSTRAINTS  DESIGN CHOICES • Loading • Cooling is needed to extract the almost 27 kW of average power of the future beam. • A 2 GeV proton beam requires a dump 130 cm long (when entirely made of Copper). • The diameter is defined to intercept up to 5 of the upgraded maximum beam:  = 50 cm

  14. CONSTRAINTS • Installation and lifetime • Location • Reliability • Access • Loading • Cooling circuit • Material

  15. CONSTRAINTS • Cooling circuit: cooling is needed to extract the almost 27 kW of average power of the future beam • Cooling by natural convection has been proved to be not sufficient (preliminary analyses). • A solution with forced air cooling is not possible either: impossibility of having a closed air loop with enough flow in this particular area of the tunnel. • Water cooling is mandatory to extract the almost 27 kW of average power of the future beam. • The minimum cooling flow is estimated at ~2m3/h, when water at ambient temperature is used.

  16. CONSTRAINTS  DESIGN CHOICES • Cooling circuit: cooling is needed to extract the almost 27 kW of average power of the future beam • Position of the cooling pipes: close to the beam axis (maximum peak of temperature), provided that radioactive activation of water is kept within acceptable limits. • Redundancies to improve cooling reliability: 4 independent water circuits

  17. CONSTRAINTS • Installation and lifetime • Location • Reliability • Access • Loading • Cooling circuit • Material

  18. CONSTRAINTS • Material: • Does not need inert atmosphere. • Good thermal and mechanical properties, to optimise heat extraction and to guarantee the structural behaviour of the material. • Materials that have a good long term performance in a radioactive environment. • Galvanic corrosion in between materials. • Erosion corrosion in pipes (max. speed of water).

  19. CONSTRAINTS  DESIGN CHOICES • Choice of material: following the principle of reliability and simplicity • Basic metal compounds • Thermal and mechanical properties are well known • Workability and behaviour in extreme conditions (such as ionizing radiation) is well assessed • Candidate materials: Graphite, Aluminium, Stainless Steel, Copper, Titanium

  20. PROPOSAL OF A NEW DESIGN • Geometry • Multiple-disk like geometry: • To lower the stress level • To allow natural air cooling and thermal radiation to play a role in the heat extraction from the dump

  21. PROPOSAL OF A NEW DESIGN Cylindrical object, two meter long and 50 cm across, with two distinct parts, one meter long each. Aluminium keeps levels of energy deposited by the impinging beam low, while Copper helps to release the heat generated in the inner core and acts also as a shielding. Outer core, made of Copper or Stainless Steel Inner core. Disks made of Aluminium Structure made entirely in Copper or Stainless Steel 4 independent water circuits cool down only the first part

  22. PROPOSAL OF A NEW DESIGN Elastic clamping. Regulates the stress in the water pipes

  23. PROPOSAL OF A NEW DESIGN

  24. ANALYSES* to be confirmed by FLUKA • Sliced core made of Aluminium, surrounded by sliced Copper parts. • Steady State Temp reached in the core: 125°C (water cooling) • Temp in the Cu part (surrounding the Al core): remains at 22°C • Max temp in the external surface of the Al disks ~100°C

  25. ANALYSES* to be confirmed by FLUKA - Max temp in the external surface of the Al disks ~100°C

  26. ANALYSES

  27. ANALYSES

  28. CONCLUSIONS • The design proposed is the result of various iterations • Considerable number of constraints addressed in the new design • Placement, logistics • Material and cooling • Reliability • Future design more robust • Higher energies absorbed and dissipated • Disruption kept to a minimum

  29. THANK YOU FOR YOUR ATTENTION Q & A

  30. GALVANIC POTENTIALS

  31. OLD PSB DUMP

  32. PROPOSAL OF A NEW DESIGN Sliced core made of Aluminium, slices 4.5 cm thick, with a 5 mm gap in between them

  33. PROPOSAL OF A NEW DESIGN

  34. PROPOSAL OF A NEW DESIGN

  35. PROPOSAL OF A NEW DESIGN Sliced Copper parts, surrounding the disks in Aluminium. 250 mm thick, outer  500 mm, inner  360 mm Aluminium disks, 360 mm , 45 mm thick, 5 mm gap

  36. PROPOSAL OF A NEW DESIGN

  37. PROPOSAL OF A NEW DESIGN

  38. PROPOSAL OF A NEW DESIGN

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