摘要:

Aberrations of the preaccelerator focusing electrodes were studied experimentally by obtaining emittance diagrams for a beam of 38 and 60 mA. Aberrations observed were similar to those obtained from previous ray‐tracing calculations. According to the calculations, the cause of aberrations is improper distribution of the radial field in the exit portion of the lens. More distortion of the phase‐space diagram was observed for the higher beam current than the lower one. The observed emittance area increased by more than a factor of two when the beam current was changed from 38 to 60 mA. Even if aberrations were entirely eliminated, this fact may raise a serious problem in beam matching for a large beam current. A technique for measuring the emittance of the beam at 200 kV was developed and the details are described.

ISSN:0034-6748    

DOI:10.1063/1.1717950

出版商:AIP    

年代:1962

数据来源: AIP

摘要:

Two modifications of the magnetic suspension balance are described for determining densities and partial specific volumes. Both modifications are capable of high precision. Also, they require comparatively small amounts of the materials and short times for the determinations.

ISSN:0034-6748    

DOI:10.1063/1.1717951

出版商:AIP    

年代:1962

数据来源: AIP

摘要:

A reflecting variable bent crystal spectrometer is described which in some forms varies between Johann and Johansson arrangements. The variable bent crystal and its spectrometer arrangement differ from the Harker concept. The variable control features of this spectrometer permit compensation for tolerances, application, and aging. As a result this combination of events has already resulted in achieving experimental signal‐to‐noise ratios as high as 3100 to 1 using a mica crystal on pure silicon. Other features permit direct comparison of relative x‐ray intensities without diffraction volume correction.

ISSN:0034-6748    

DOI:10.1063/1.1717952

出版商:AIP    

年代:1962

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1717953

出版商:AIP    

年代:1962

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1717954

出版商:AIP    

年代:1962

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1717955

出版商:AIP    

年代:1962

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1717956

出版商:AIP    

年代:1962

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1717958

出版商:AIP    

年代:1962

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1717959

出版商:AIP    

年代:1962

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1717960

出版商:AIP    

年代:1962

数据来源: AIP