ISSN:0034-6748    

DOI:10.1063/1.1752219

出版商:AIP    

年代:1937

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752220

出版商:AIP    

年代:1937

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752221

出版商:AIP    

年代:1937

数据来源: AIP

摘要:

A convergent Soller type slit, adaptable to a camera of arbitrary radius, serves to select those pencils of x‐rays which emanate from a broad focal spot and impinge upon any selected point on the equator of the cylindrical camera. The diffracting powder is mounted on the camera wall in the form of a thin sheet which intercepts the wedge of x‐radiation. In this manner all x‐rays diffracted at the same Bragg angle are brought to a focus at the equator of the camera.

ISSN:0034-6748    

DOI:10.1063/1.1752222

出版商:AIP    

年代:1937

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752223

出版商:AIP    

年代:1937

数据来源: AIP

摘要:

The construction of a small experimental spectrograph of the curved crystal type is described. The use of quartz instead of mica or gypsum which are customarily used and the improvement of the spectra obtained when quartz is used are discussed. The theory of the curved crystal x‐ray spectrograph has been extended in two ways: (1) to cover the doubling of spectral lines which arises due to reflections from opposite surfaces of the crystal, and (2) to cover the vertical separation of spectral lines produced by reflections from opposite sides of atomic reflecting planes. This latter effect is traced to a nonparallelism between the reflecting planes and the axis of curvature of the crystal. By means of the curved crystal spectrograph the grating constant for the basal planes of quartz was determined. This value was found to bed=5.393±0.002A.

ISSN:0034-6748    

DOI:10.1063/1.1752224

出版商:AIP    

年代:1937

数据来源: AIP

摘要:

An apparatus designed for nuclear studies at energies up to somewhat in excess of 300 kv is described. The potentials are derived from a voltage quadrupling circuit using laboratory constructed rectifiers and condensers. The accelerating tube, of the cascaded type, and its accompanying ion source furnish steady, well‐focused proton beams. Effective proton intensities of 12, 40, and 60 microamperes are available in the beams of ionic masses 1, 2, and 3 respectively. Voltages are measured by a resistance voltmeter which has been calibrated to an accuracy of a few tenths of one percent. Certain peculiarities of the ion source which affect the homogeneity of the ion energies are discussed.

ISSN:0034-6748    

DOI:10.1063/1.1752225

出版商:AIP    

年代:1937

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752226

出版商:AIP    

年代:1937

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1752227

出版商:AIP    

年代:1937

数据来源: AIP

摘要:

A regulator for maintaining constant, to better than 0.1 percent over long periods, the magnetic field of large (100 kw) electromagnets is described. This consists of two basic components: (1) A vacuum tube voltage regulator which compensates for rapid changes in voltage and thus anticipates the change in current which would result. (2) A current actuated element arranged so as to alter the operating point of the voltage regulator in order to compensate for slow changes in current due to changes in the temperature of the windings. Very rapid regulator action is secured with no drift or hunting to the limit specified.

ISSN:0034-6748    

DOI:10.1063/1.1752228

出版商:AIP    

年代:1937

数据来源: AIP