Several improvements in the high-voltage heavy-ion-beam probe (HIBP) are discussed. (1) It is clearly found that the precision slide mount of the detector plates 30° parallel to the base electrode is very effective for the determination of the in-plane entrance angle of the beam in the analyzer to estimate the error in the potential measurement. (2) A two-staged optical trap in the HIBP greatly reduced the effect of the UV radiation in the analyzer. (3) A multiple-plate detector up to 13 measurement points clearly showed the direction of the propagation of the turbulence and path-integral effects.
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