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Introduction Compact NPA (CNPA) is a joint name of novel spectrometers of reduced size (169x302x326 mm). These spectrometers were designed to build them more easily at experimental facilities.

Presently we have the following modifications of CNPA:

 

CNPA Type Detected Atom Species Stripping Method Energy Range (for H0) Number of Energy Channels

CNPA-L

(Low energy CNPA)

H0, D0

 N2 Gas

64 - 968 eV

Up to 80

(40 in one row)

CNPA-M

(Medium energy CNPA)

 DLC Foil

0.8 - 80 keV

CNPA-H

(High energy CNPA)

0.82 - 168 keV

 

The compact size of spectrometer is achieved by 2 innovations:
1. Using a high-field-strength (1 T) NdFeB permanent magnets instead of the traditional electromagnets for generation of the analysing magnetic field.
2. Using a very compact gas cell (CNPA-L) or thing carbon foil (CNPA-M, CNPA-H) for neutral flux stripping.

The analyzers of this type has been successfully employed on the following plasma machines:
               - Wendelstein 7-AS (Germany) [1]
                    - LHD (Japan)
                         - TJ-II (Spain) [2]
                               - TCV (Switzerland) [3]
                                    -  SSPX / MST (USA)
                                          -  Tri Alpha Energy (USA)
                                               -  TUMAN-3M (Russia)
                                                    -  T-11 (Russia)

References

    [1] Chernyshev F.V., Afanasyev V.I., Detch A.V., et al., Instr. and Exp. Tech., 47 (2004) 214.
    [2] Balbin R., Petrov S., Fontdecaba J.M., et al., 32nd EPS CPP, Tarragona (2005) 29C, D-5.001.
    [3] Karpushov A.N., Duval B.P., Schlatter C., Afanasyev V.I., Chernyshev F.V., Rev. Sci. Instrum., Volume 77, Issue 3, pp. 033504-033504-13 (2006). 

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