Plunger review - follow up
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Europe/Zurich
6/2-008 (CERN)
Plunger review - follow up
Present: Michele Bergamaschi, Fern Pannell, Arthur Clairembaud, Marlene Turner, Patric Muggli, Nikita Zena van Gils, Luca Ranc (zoom)
Discussion points:
- Three positions of screens: out/in beamdump/in screen
- Should there be a double foil or two separate foils? fluence, beamsize and more spot considerations. If single foil, one needs to ensure that reflection is dumped in a safe place.
- Estimate ~4000 events per plunger
- may need high statistics to pull signal out, events to be designated carefully
- need to find energy. PM: there we need to have a clear strategy. Maybe start at 10m, then decrease slowly to guess energy range.
- injection efficiency needs to be close to 100%
- there will likely always be an unknown at where injection actually occurs.
- Spectrometer magnets can only be set to image in one plane when the plasma ends earlier than 9.5 m
- Screen retraction, screens retract towards aisle side, but still stick in--> laser will cause diffraction
- proton beam halo may also interact with holder and cause additional background
- shimming is an ~1hr intervention
- May plungers be used to study e-beam/plasma interaction?
- when laser beam dump is inserted upstream, screen will block e-beam
- Spectrometer background
- to be studied carefully during the SSM run (including changes)
- biggest worry is that signal wont be visible
- should know beforehand where optimum electron beam positions on the screen are. trade off between dispersion and background.
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