ECN3 TF: Target/XTAXs #2 meeting EA-STI

Wednesday 31 Aug 2022, 14:00 → 15:00 Europe/Zurich

530/R-030 - BE-EA Conference Room (CERN)

Points to discuss:

• Kick-off XTAX WG: mandate
• Operational cases/configurations
  • Beam & magnet settings
  • Corresponding T4 & XTAX configuration
• Models
  • Drawings, CATIA, FLUKA

Notes & ACTIONS

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Operational aspects about the XTAX

• H8 TAX (left blocks) shall be consider too in the studies as primary beam can also go there (e.g. if magnets are off beam goes straight to H9 line).
• XTAX used for expert access to the experimental area, acting as a sort of beam stopper.
• Different holes in XTAX are used mostly to reduce intensity to the experiments. E.g. Be holes can be used for primary beams.
• W inserts are used on the small holes to reduce the scattering of absorbed particles.
• For the future, less holes may be required.
• Difference between drawing/CATIA position of the holes and ctrls position setting may differ slightly. The later is tuned once in a while (e.g. once/year) by having a set of spills at different positions, e.g. 20 spills with XTAX displacement of 1 mm steps. Can be done at low or higher intensity.
• Target is also used as safety element. When in beam, it can reduce (xx % ??) of intensity on XTAX.

Other points:

• Strategies for "passing" the T4 target for high intensity beams can be wobbling the target, blowing up the beam, passing over the plates via dedicated magnets (instead of target movement)
• Shielding optimization may also be foreseen within the WG

 

New actions:

• ACTION EA → To clarify the real functional requirements of the XTAX
• ACTION STI/EA → To clarify differences between the XTAX CATIA/drawings/FLUKA model on a dedicated meeting
• ACTION EA → To include Be and W inserts on the 3D models of the XTAX
• ACTION STI/EA → To clarify the vacuum chamber & windows position and include them in the TCC2 integration model
• ACTION Johannes Bernhard → To provide a document with the XTAX user cases, particularly a summary of worst operational cases to be considered as well as the corresponding magnetic fields of the magnets upstream and between T4 and XTAX