A new Compact Neutral Particle Analyzer (CNPA) [1] has been developed at A.F. Ioffe Physical-Technical Institute. The CNPA is an energy and mass spectrometer of reduced size (169´302´326 mm). It is designed for the simultaneous analysis of H 0 (0.8 -80 keV) and D 0 (0.66 -36 keV) fluxes emitted by plasma. Significant reduction of spectrometer size and weight (42.5 kg) is achieved by two innovations: 1) employing of stripping in a thin (100 Å) diamond-like carbon foil instead of the traditional stripping in gas; 2) using a high-fieldstrength (1 T) NdFeB permanent magnets instead of the traditional electromagnets for generation of the analysing magnetic field. An acceleration of particles scattered in the stripping foil is employed in the CNPA, which together with a magnetic field configuration providing two-coordinate focusing is used to achieve a better detection efficiency. The CNPA has the following significant advantages in comparison with conventional NPAs:1) The compact spectrometer can be installed practically at any position around plasma machine. It can be easily moved or replaced in the case of need.2) The CNPA shielding against n-gamma radiation and against stray magnetic field can be made more compact.3) The arrays of such instruments for a purpose of multichord diagnostic can be easily formed.4) The CNPA has a high detection sensitivity (10-100 times higher than for conventional NPAs) due to wide solid angle of observation and high detection efficiency.5) The CNPA does not require its own high-vacuum pumping system (because of absence of gas inlet) and does not require magnet power supply (because of permanent magnets usage).The CNPA has been tested on the Wendelstein 7-AS stellarator at IPP,

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Problems related to neutral particle flux measurements on the ITER tokamak reactor under intense plasma background radiation conditions are considered. The results of measuring a background sen sitivity with respect to neutron and γ radiation for the scintillation detector, which is based on three different crystals (CsI (Tl), ZnO(Ga), and YAG(Ce)), are presented. The scintillators are compared and conclusions about the possibility of their applications in detectors of neutral particle analyzers currently created at the Ioffe Institute for the ITER tokamak reactor, are drawn.

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