title: Note: Spectrometer with multichannel photon-counting detector for beam emission spectroscopy in magnetic fusion devices.
abstract: A spectrometer based on a linear array photomultiplier tube (PMT) has been developed and calibrated. A 0.635 m focal length Czerny-Turner monochromator combined with a coupling optics provides an image of a narrow 0.5 nm spectral range with a resolution of 0.015 nm/channel on a 32-anode PMT. The system aims at spectroscopy of D(α) or H(α) lines emitted by a diagnostic atomic beam in a plasma (primarily a motional Stark effect diagnostics). To record a low photon flux of ∼10(6) s(-1) per channel with the time resolution of 100 μs, a pulse counting approach has been used. Wideband amplifiers scale single-electron pulses and transmit them to a digital data processing core hardwired in a programmable logic matrix. Calibrations have shown that the aberration-limited instrument function fits to a single detector channel of 1 mm width. Pilot results of passive measurements of D(α) light emission from the plasma confined in a magnetic trap are presented.
authors.affiliation: Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
authors.forename: A
authors.initials: A
authors.lastname: Lizunov
authors.affiliation: Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
authors.forename: A
authors.initials: A
authors.lastname: Khilchenko
authors.affiliation: Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
authors.forename: V
authors.initials: V
authors.lastname: Khilchenko
authors.affiliation: Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
authors.forename: A
authors.initials: A
authors.lastname: Kvashnin
authors.affiliation: Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia.
authors.forename: P
authors.initials: P
authors.lastname: Zubarev