Photon beam position monitor

Radiant energy – Invisible radiant energy responsive electric signalling

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324 713, G01T 129

Patent

active

053877950

ABSTRACT:
A photon beam position monitor for use in the front end of a beamline of a high heat flux and high energy photon source such as a synchrotron radiation storage ring detects and measures the position and, when a pair of such monitors are used in tandem, the slope of a photon beam emanating from an insertion device such as a wiggler or an undulator inserted in the straight sections of the ring. The photon beam position monitor includes a plurality of spaced blades for precisely locating the photon beam, with each blade comprised of chemical vapor deposition (CVD) diamond with an outer metal coating of a photon sensitive metal such as tungsten, molybdenum, etc., which combination emits electrons when a high energy photon beam is incident upon the blade. Two such monitors are contemplated for use in the front end of the beamline, with the two monitors having vertically and horizontally offset detector blades to avoid blade "shadowing". Provision is made for aligning the detector blades with the photon beam and limiting detector blade temperature during operation.

REFERENCES:
patent: 3612858 (1971-10-01), De Parry
patent: 5160917 (1992-11-01), Wechsler et al.
R. Anne, G. Milleret, A. Lefol, R. Perret, "Secondary Emission Detector System for Saturne II." IEEE Transactions on Nuclear Science, vol. NS-24, No. 3 (Jun. 1977) pp. 1754-1755.

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