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A muon veto counter must be placed inside the cryostat to be effective for surface muons. Additionally, the thin counter detecting incoming muons is located inside the cryostat to keep the best possible beam focus at the sample. Thus there are two counters (with light guides and phototubes) in this assembly.
Inside the cryostat, the two counters (cyan, violet) and the sample rod (orange) are supported and contained by a fibreglass shell (blue) with three compartments. The shell screws onto the main body - an aluminum (cyan) `barrel' - just outside the cryostat (above the clamp). The light guides spread apart to pass through sliding seals in the main end flange and reach photomultiplier tubes.
Maintained by Donald Arseneau,
For the TRIUMF ÁSR Facility |