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Dedicated Injection Region Design Meeting: Beam stoppers on electron lines
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Europe/Zurich
6/2-004 (CERN)
Dedicated Injection Region
Present: Maria-Carmen, Francesco, Patric, Steffen, Edda, Tobias, Marlene, Eleonora
Beam Stoppers:
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During electron gun commissioning, the first dipole will sometimes be off; the beam will be stopped at the Faraday cup or another beam stopper agreed with RP.
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Beam stoppers are planned for both the 18 MeV and 150 MeV e-beamlines, in the dogleg and upstream of the valves. This allows the first dipole to be used as an energy spectrometer while keeping the dogleg valve closed.
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If space is tight (beam stoppers need ~15 cm), the screen after the dipole could double as a beam stopper.
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During e-beamline commissioning, no Rb will be in the system. Valves can remain open, and beam stoppers will be at the end of the commissioning chambers. Action: Eleonora to follow up with SY-STI on what would be acceptable and also discuss potential losses along the beamline.
Open Questions:
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For accident scenarios, what is the maximum tolerable power (temperature rise) on a valve?
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What is the heat load produced by the electron beams?
Other Points:
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A waist measurement screen will be included in the commissioning chamber.
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Need to define a global commissioning procedure; it will be iterative.
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Action: Tobias to check current commissioning plans in the planning schedule, including hardware commissioning, dry-runs, pre-commissioning, and commissioning of both the electron gun and beamline.
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Required accuracy of charge measurements during experiments to be determined.
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