PUMA-RC6 Survey and Alignment

Wednesday 22 May 2024, 10:30 → 11:00 Europe/Zurich

508/1-001 (CERN)

20240522_RC6_Alignment.pdf

Attendees: 

Oliver Aberle, Erwin Siesling, Alberto Martinez De Zuazo Martinez, Nicholas Chritin, Antje Behrens, Alexandre Beynel, Lukas Nies

Talking points:

• Layout of RC6 beamline
• Survey results of existing elements
• Beamline sectioning
  • Combining different elements on shared mount with independent alignment options
• Discussion with the alignment team for the type of targets to use for the DB tanks and type of aligning table.
• Discuss the need of bellows upstream and downstream the DB tanks (hydroformed preferred, EWB if too limited in space)
• Alignment of electrodes of HV transfer beamline part inside vacuum vessels 

Minutes

• general design is discussed different sections for alignment are proposed by LN:
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• After floor is reworked, survey team would like to install reference points, which should not be obstructed by the high-voltage cage or other installation
• First QP doublet: check if support can be reused
• Second QP doublet: check if support can be found
• Nicholas will contact Vincent Barozier for the existing ISOLDE QP designs
• Standard QPs at ISOLDE are aligned based on their major flange, will be done here as well
• Target holders for aligment: design will be shared by Nicholas once the design is ready
• New DBs:
  • HIE-ISOLDE DBs alignment procedure will be reused as from existing design
  • Instruments inside the vessel are aligned either directly with the survey team, or the vessel itself will be aligned assuming instruments inside the vessel are aligned by installation
• Section 1:
  • Reuse old mount if possible
  • Valve will be ISO standard, following drift tube will be adapting ISO on one side to CF on the other side -> design needed
• Section 2: 
  • DB and QP to be independently alignable, will require moving DB a bit downstream and QP a bit upstream to fit hydroformed bellows
  • Ideally, shared mount with independent tables for alignment 
  • How much misalignment can the hydroformed bellows take? About +-1mm 
• Section 3: 
  • Align electrodes with respect to center flanges and then align vessel with respect to center flanges -> adapter to mount targets inside electrodes to be designed
• Section 4 & 5: MIRACLS hardware, to be aligned with theodolite as was done before. Support to be designed by EP-SME-IS (Lukas)
• Section 6: same as section 3
• Section 7: Straight flanges on DB, bellows will not be welded directly to the DB. Stiffness of ZQNA Elena QP support structure to be checked.
• Section 8: to be combined with section 9?
• Section 9: 
  • Mapping and aligning switchyard electrodes to be discussed. Disassembly planned for 29th of May. 
  • Kicker will be fixed with respect to the vessel, only bender to be aligned -> procedure to be found
• Section 10:
  • Similar to section 7
• Section 11: only DB, ends in a vacuum valve, no bellow between 
• For handover points: no bellow on the downstream side of DBs, as valve has to be supported by DB itself