CMS beam vacuum layout for Run4 Roadmap as discussed with EN-ACE On behalf of all contributors J. Sestak Updated presentation 15082025 Two ways of handling the ECR document for Run 4 Complex document integrating all functional aspects,
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Presentation Transcript
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CMS beam vacuum layout for Run4 Roadmap as discussed with EN-ACE On behalf of all contributors J. Sestak
Updated presentation 15/08/2025<br>
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Two ways of handling the ECR document for Run 4
Complex document integrating all functional aspects,
Usually lacking clarity, very heavy, complicated for the follow-up.
Simple summary document serving as the link to all sub-documents.
Implementing product lifecycle documents from conceptual – development – production – OP stage
Elegant way however – All sub-documents must be released. ECR document<br>
Ok, sounds easy but:
We need to have general “design consideration agreement per functional specification”.
We need to have limits & margins.
Based on which we can produce dedicated specification per IR.
And we need to have all this released… Sub-documents 25 August 2025 Presenter | Presentation Title 3<br>
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Mechanical aperture of the machine
Limits based on:
Beam position, envelope, parameters, mode, halo ,etc.
Beam clearance requirements
Boundary conditions dependent on:
Material models
Geometrical product specifications – Real product appearance (imperfections)
Structural feedback given by:
Thermal loads
Inertial loads in static conditions (own weight)
Inertial loads in dynamic conditions (fast abort; ramp-up / down of the solenoid)
Survey methods and precision of “target to beam-axis” tolerance chain. Sub-documents for machine stakeholders 25 August 2025 Presenter | Presentation Title 4<br>
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The same we need for the impedance… Sub-documents for machine stakeholders 25 August 2025 Presenter | Presentation Title 5<br>
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The same we need from the CMS, mainly:
Vacuum limits
Beam-gas background limits translated to “acceptable composition” residual gas spectrum and dedicated partial pressures of residual gas.
Both for static and dynamic conditions.
Integration
Run positions without / with B-field
Other special use-cases such as Fast Abort (?), Earthquake spectrums
Precision of adjustment for supporting system
Needs for detector acceptance
But driving how much time we spend on the task – ALARA. Sub-documents for the experiment 25 August 2025 Presenter | Presentation Title 6<br>
