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BGV Chamber Concept and Layout

BGV Chamber Concept and Layout. Ray Veness and Nicolas Jurado With thanks to Plamen Hopchev and Giuseppe Bregliozzi. Chamber Concept. Main design constraints ‘Window’ in thin-walled aluminium AA2219 (6% Cu) is the only qualified grade that resists NEG activation temperature and is weldable

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BGV Chamber Concept and Layout

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  1. BGV Chamber Concept and Layout Ray Veness and Nicolas Jurado With thanks to Plamen Hopchev and Giuseppe Bregliozzi

  2. Chamber Concept • Main design constraints • ‘Window’ in thin-walled aluminium • AA2219 (6% Cu) is the only qualified grade that resists NEG activation temperature and is weldable • Fits between the QRL and Beam 1 pipe • Has a realistic chance of manufacture for installation at ~Easter 2014 • Implies using materials already available at CERN and standard solutions in critical locations

  3. Chamber Concept A B D C

  4. Chamber Concept • A: Window chamber • Manufactured from AA2219 3D forged blocks • 1 m long forged bars exist in VSC for 50 mm chamber section • 400 mm diameter block exists in VSC for window, but must be forged • Bi-metallic (Al-316LN) Conflat flanges (DN100 and DN 235) can be bought from ATLAS Technologies in the USA • B: Enlarged drift vacuum Chamber • Manufactured from stainless steel • DN235/OD295 316LN flanges are CERN stores standard • 212/219 ID/OD tube (any length upto ~6.5 m) is a standard LHC vacuum chamber dimension – VSC should have in stock • Vacuum chambers supports for this tube should also exist in VSC • Weld-in port(s) for gas injection if needed • C: Transition Chamber • Could use ‘standard’ LHC transition from 212-80 mm with smaller flange • If smaller than 80 mm needed, then either use an insert or a special design • D: Vacuum pumping modules • Standard 400 l/s ion pump modules, as defined by G.Bregliozzi

  5. Chamber Concept OD295 flange gives only a 4.5mm clearance to the nominal OD of the adjacent beamline. This needs to be agreed with VSC

  6. Preliminary Layout G.Bregliozzi proposes making new vacuum sectors, splitting A7L4 into A7L4, B7L4, C7L4 with 2 new valve/instrument sections and replacing 3x standard 7 m chambers with the BGV sector New valves/instruments in these locations

  7. Preliminary Layout According to this preliminary study by N.Jurado(BE-BI) the nominal position at ~DCUM 9775 should not interfere with QRL bellows or other equipment

  8. Conclusions and Actions • Conclusions • A conceptual design has been proposed, using available materials for critical parts, that could (with effort) be made within the LS1 timescale • A preliminary discussion with Plamen and Giuseppe has led to a layout plan that appears acceptable for VSC and appears to fit in the LHC • Next actions • Request approval from VSC for use of their materials (aluminium, stainless tubes, supports) and for the 4.5 mm clearance to the adjacent chamber • Order long lead-time items: Forging of the OD400 aluminium block to a rough shape; bi-metallic flanges • Request an ‘official’ integration study • Detailed design of the window chamber and the length of the drift chamber can be studied in parallel with these actions

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