摘要:

Retarding field analyzers of the plane parallel plate, the spherical condenser, the Faraday cage, and the filter lens types are examined in some detail. The often neglected lens effect of the hole in the plane parallel plate through which the beam passes is shown to have significant effect on the energy resolution. The previous analysis of the spherical condenser is extended to the hemispherical case and the effect of the aperture in the inner sphere calculated. It is shown that for certain relations between the sphere sizes and the position of the source very high resolution may be obtained. The general restrictions on the performance of imaging retarding fields are considered and a design procedure based upon empirical knowledge of immersion lenses is given.

ISSN:0034-6748    

DOI:10.1063/1.1717235

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

An apparatus, employing a fine‐wire probe, for the detection of insulating surface films on metal surfaces is described. A chemical cleaning procedure to prepare reliably clean palladium and gold surfaces is reported, and examples of the reproducibility of the method are given. Examples of the use of this apparatus include: the detection of high resistance areas on relay contacts taken from sealed relays, and a study of insulating base metal oxide impurities in commercial relay contacts. In the latter work, a sensitized paper test showed areas of iron and copper deposits on the contacts which could be correlated with areas of high resistance as indicated by the probe.

ISSN:0034-6748    

DOI:10.1063/1.1717236

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

Apparatus has been devised for automatically measuring and recording vapor pressure (1 to 35 atm) and temperature (−40 to +100°C) of pure liquids or solutions. The measurements are performed on a dynamic system whereinPandTare changed at very slow rates. ManyP‐Tdata sets are recorded in a single run, providing the input for a computer program which correlates the two variables. Data for dichlorodifluoromethane are presented and compared with literature values. It is concluded that precise and accurate results are obtained with the automatic apparatus. Furthermore, the data processing program provides valuable information for analyzing the operation of the equipment.

ISSN:0034-6748    

DOI:10.1063/1.1717237

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

A heavy liquid bubble chamber with a useful volume of 100×50×50 cm operating in a magnetic field of 20 000 gauss is described. Engineering details are given. Lateral illumination of the liquid and scattering of light at 90° is used to photograph the tracks. Different mixtures of Freon (CF3Br) and propane have been used in the chamber allowing a choice of radiation length and stopping power particularly suitable to the experiment performed.

ISSN:0034-6748    

DOI:10.1063/1.1717238

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

An experimental technique is described which is being successfully used to study the transient high stress piezoelectric behavior of synthetic alpha‐quartz. Short, flat‐faced cylinders of quartz are impacted upon each other at high velocity to produce the desired transient stress in the range from 5–70 kilobar. Precision is maintained in the alignment of the flat impact surfaces so that the Hugoniot conservation of momentum and the relationship governing the impact of flat cylinders may be used to compute the stress imparted to the target cylinders of quartz. Electric charge release data are taken in conjunction with the initial passage of the stress wave produced by impact.

ISSN:0034-6748    

DOI:10.1063/1.1717239

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

The focusing properties are given for a broad‐range magnetic spectrometer formed by inclined plane pole faces.

ISSN:0034-6748    

DOI:10.1063/1.1717240

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

A description is given of a small heavy‐ion linear accelerator based on the use of a twin transmission line as first suggested by Sloan and Lawrence. Ions are accepted if theire/mvalues are ⅛ or greater (relative to the proton) and are accelerated to a final energy of 1.04 Mev/nucleon. The accelerator has 40 drift tubes fitted with focusing grids, and about 350 kw of pulsed rf are needed for ions ofe/m=⅛. The radio frequency is 25 Mc, and the accelerator is pulsed at up to 50 pps with a pulse length of 500 &mgr;sec. Injection velocity is 0.007c, corresponding to a dc acceleration from the ion source through 180 kv for an ion ofe/m=⅛. Ions are produced in a pulsed dc arc of the Penning type operating in a magnetic field of 1000 gauss and the dc accelerating voltage is supplied by an electrostatic generator. Typical pulsed meter currents so far obtained are, for He+, input 4 ma, output 150 &mgr;a; for N2+, input 3 ma, output 75 &mgr;a. The accelerator is the first stage of three which will take the ions to a final energy of 10 Mev/nucleon. The second and third stages, which are under construction, will be cavity resonators of the Alvarez design.

ISSN:0034-6748    

DOI:10.1063/1.1717241

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

This paper describes a photoconductive locator for continuous recording of physical displacement. The system is applied as an example to the optomechanics of the Sucksmith ring balance. It is shown that the sensitivity and accuracy are considerably higher than those obtained with optical instruments such as the traveling telemicroscope. Application to wave modulation is suggested.

ISSN:0034-6748    

DOI:10.1063/1.1717242

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

High audio frequency elastic modulus measurements are possible using the vibrating reed if one can measure overtone frequencies. An electromagnetic detector is described which facilitates the measurement of these overtones, thereby extending the range of the vibrating reed to at least 10 kc.

ISSN:0034-6748    

DOI:10.1063/1.1717243

出版商:AIP    

年代:1961

数据来源: AIP

摘要:

A Von Ardenne‐type ion source and lens system has been developed for use as a preinjector to the 18‐Mev strong‐focusing linear accelerator. Proton beams of 120 ma at an ion production efficiency of 83% have been obtained. A magnetic beam‐confining system has been built, and a beam of 85 ma has been transported 82 in. The beam energy was 370 kev, and its emittance was 100 mrad‐mm. The beam diameter was 1 cm. This is within the linear accelerator's calculated acceptance of 179 mrad‐mm.

ISSN:0034-6748    

DOI:10.1063/1.1717244

出版商:AIP    

年代:1961

数据来源: AIP