RSI Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

SECTION LISTING

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

Jun 1957

Volume 28, Issue 6, pp. 403-473


Electron Model Fixed Field Alternating Gradient Accelerator

F. T. Cole, R. O. Haxby, L. W. Jones, C. H. Pruett, and K. M. Terwilliger

Rev. Sci. Instrum. 28, 403 (1957); http://dx.doi.org/10.1063/1.1715895 (18 pages) | Cited 19 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Show Abstract
A radial sector FFAG accelerator has been constructed and successfully operated. In this 8‐sector accelerator electrons are betatron accelerated from 25 to 400 kev using both continuous and pulsed injection. The number of radial betatron oscillations per revolution may be varied from 2.3 to 3 and the number of vertical oscillations per revolution from 1 to 3. Calculations of these oscillation frequencies using various approximations are described and discussed. These frequencies have been measured statically with the unaccelerated beam and dynamically using an rf perturbing voltage on the accelerated beam. Results of these calculations and experiments are in satisfactory agreement. Effects of misalignments have been measured and are in close agreement with calculations presented. A survey has been made over a large area of the betatron oscillation stability region. The effects of the many resonances observed are in good qualitative agreement with theory.

Lead Glass Čerenkov Radiation Photon Spectrometer

John M. Brabant, Burton J. Moyer, and Roger Wallace

Rev. Sci. Instrum. 28, 421 (1957); http://dx.doi.org/10.1063/1.1715896 (4 pages) | Cited 4 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Show Abstract
A spectrometer for analyzing photons of energies extending up to several Bev has been constructed and used successfully. This instrument essentially consists of a cylinder of glass, 12‐in. diam and 14‐in. long containing 52% of PbO, viewed by four 5‐in. diam photomultipliers. High‐energy photons incident along the spectrometer axis produce electron showers in the transparent high‐Z glass. The total Čerenkov radiation emitted by these electrons and detected by the phototubes is nearly proportional to the energy of the incident photon, from 50 Mev to at least 1.4 Bev. The spectrometer has been calibrated over this range of photon energies by the pulses produced by electrons of the same energies. Above 200 Mev the measured energy resolution of the spectrometer is 30% and is approximately independent of energy. For elimination of incident charged particles during the analysis of γ rays the spectrometer is operated in coincidence with a preceding photon‐identifying counter system.

Monoenergetic Absorption Peaks Obtained with a Scintillation Spectrometer

J. Richard Haskins

Rev. Sci. Instrum. 28, 425 (1957); http://dx.doi.org/10.1063/1.1715897 (2 pages)

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Show Abstract
The effect of finite channel width in distorting intensities of monoenergetic lines in a scintillation spectrometer is considered. It is found that peak area divided by channel width gives the rate of monoenergetic absorptions in the crystal. A correction to intensities proportional to the square root of the pulse height is not applicable.

Remarks on Double Solute Liquid Scintillators

P. Avivi and A. Weinreb

Rev. Sci. Instrum. 28, 427 (1957); http://dx.doi.org/10.1063/1.1715898 (3 pages)

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Show Abstract
The behavior of wavelength shifters in liquid scintillators is discussed. The properties necessary in order that a fluorescent compound act as a wavelength shifter are considered in detail and a qualitative criterion for efficient wavelength shifting is presented. Several double solute solutions have been tested; accordingly it was found that the criterion is useful.

Radiocarbon Dating with Liquid CO2 as Diluent in a Scintillation Solution

G. W. Barendsen

Rev. Sci. Instrum. 28, 430 (1957); http://dx.doi.org/10.1063/1.1715899 (3 pages) | Cited 2 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Show Abstract
The use of the scintillation technique for radiocarbon dating has until now been retarded by the difficulties encountered in the chemical procedure. This paper shows it to be feasible to use the carbon dioxide obtained by combustion of the sample, without any further chemical conversion, as a diluent in a scintillation solution. Up to 80% by weight and possibly more liquid carbon dioxide can be dissolved in toluene+5 g∕l diphenyloxazole (PPO). However, the presence of CO2 in the scintillator interferes somewhat with the light emission in such a way that the decrease in pulse height, as compared with pure toluene+5 g∕l PPO, is 50% for 20% by weight dissolved CO2. This limits the percentage of CO2 that can be used effectively to about 30%.
The counting rate due to modern carbon is 9.1 c∕min, and the background is 15.5 c∕min. Measurements indicate however that both these figures can be improved considerably, so as to make this technique at least comparable with the gas‐counting technique.

Preparation of Large Plastic Scintillators

G. W. Clark, F. Scherb, and W. B. Smith

Rev. Sci. Instrum. 28, 433 (1957); http://dx.doi.org/10.1063/1.1715900 (5 pages) | Cited 10 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Show Abstract
A process is described for the manufacture of disks of plastic scintillators weighing over 100 kg and composed of polystyrene (∼99%), p‐terphenyl (∼1%), and POPOP (∼0.03%). The design and performance of two large plastic scintillation detectors for cosmic rays are discussed.

Gravity Anomaly Simulator

J. A. F. Gerrard, L. Strickland, A. L. Wade, and H. K. Reynolds

Rev. Sci. Instrum. 28, 438 (1957); http://dx.doi.org/10.1063/1.1715901 (5 pages) | Cited 1 time

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Show Abstract
An instrument that will simulate the anomalous gravity effects of a subsurface body, having a density differing from that of its surroundings, is described. The device makes use of the similarity between the gravity equation and Lambert's cosine θ law, and enables the geophysicist to synthesize the anomaly producing body in a time much shorter than that required for conventional computational methods. The accuracy that can be expected is ±5% of the maximum anomaly within limitations noted in the paper.

Microwave Triode Oscillators

C. L. Andrews

Rev. Sci. Instrum. 28, 443 (1957); http://dx.doi.org/10.1063/1.1715902 (5 pages)

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Show Abstract
Coaxial and rectangular wave‐guide oscillators are described which yield frequencies of 4 to 6 kilomega‐cycles per second. A metal cap fitted around the anode end of the tube confines the anode grid cavity entirely inside the tube. Studies of efficiency indicate that the upper limit in frequency of the GL‐6299 tube is imposed by the circuit inside the tube and not by the electronics of the tube.

Millimicrosecond Time‐to‐Pulse‐Height Converter Using an rf Vernier

R. L. Chase and W. A. Higinbotham

Rev. Sci. Instrum. 28, 448 (1957); http://dx.doi.org/10.1063/1.1715903 (4 pages) | Cited 9 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Show Abstract
A time‐to‐pulse‐height converter is described which uses an rf vernier technique to facilitate the timing of an event with respect to the phase of a high‐frequency clock. The event starts an oscillator whose frequency differs only slightly from that of the reference clock. The phase of the low‐frequency beat note is used as an index of the phase of the clock at the time the event occurred.
The system is particularly adaptable to studying fast neutron velocity distributions when the neutron pulses are produced at high repetition rates. It uses a minimum of fast circuit elements, is useful over almost the entire period between pulses at 20 Mc and higher, and gives unambiguous results. The performance with random pulses and with neutron groups has been studied with a 100‐channel pulse‐height analyzer.

Acoustic Air Pump

T. M. Dauphinee

Rev. Sci. Instrum. 28, 452 (1957); http://dx.doi.org/10.1063/1.1715904 (1 page) | Cited 1 time

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Show Abstract
An air circulating pump that works on the principle of acoustic wind is described. The pump will move up to 700 l∕min of air when powered at 60 cps by a 4‐in. loudspeaker. The speaker diaphragm is the only moving part and could be protected by inert material when it is desired to seal in and circulate corrosive gases. Alternating current pickup from the speaker is so small as to be negligible in most instances.

Contribution to the Floating Zone Refining of Silicon

E. Buehler

Rev. Sci. Instrum. 28, 453 (1957); http://dx.doi.org/10.1063/1.1715905 (8 pages) | Cited 7 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Show Abstract
A floating zone refining apparatus for silicon, which can operate unattended, has been assembled to assist in the production of high purity material for research purposes. Features of this equipment are a simple mechanical drive, a switching panel to recycle the apparatus, and a self‐stabilizing rf heating circuit to maintain constant zone length. Silicon containing less than 1 part per billion of electrically active impurities (resistivity of 16 000 ohm cm and lifetime of 1.2 milliseconds) has been prepared. The effect of many‐pass refinings on the diameter of the sample is discussed. Surface tension effects on material transport are significant.

Vactroller—A Laboratory Vacuum Controller

C. J. Penther

Rev. Sci. Instrum. 28, 460 (1957); http://dx.doi.org/10.1063/1.1715906 (4 pages) | Cited 1 time

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Show Abstract
Pirani gauges are used in an ac bridge circuit to sense deviation from the set point, and with the aid of a porportional leak valve, control the pressure of laboratory‐scale vacuum systems over the range of 0.1 to 10 000 μ of Hg. Pressure fluctuations from the controller action are negligible and stability of ±1% has been obtained over long periods without operator attention. Set point is easily adjustable by panel control knob. Commercial components are used except for the leak valve which is of special construction.
back to top
RSS Feeds

Thermal‐emf‐Free Vacuum Seal for Electrical Lead Wires

T. S. Noggle, T. H. Blewitt, R. R. Coltman, and C. E. Klabunde

Rev. Sci. Instrum. 28, 464 (1957); http://dx.doi.org/10.1063/1.1715907 (1 page) | Cited 2 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Abstract Unavailable

Application of a Phoswich to Particle Identification

D. Bodansky and S. F. Eccles

Rev. Sci. Instrum. 28, 464 (1957); http://dx.doi.org/10.1063/1.1715908 (2 pages) | Cited 3 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Abstract Unavailable

Convenient X‐Ray Tube Mount for Two‐Crystal Spectrometer

F. W. Chambers and H. Cole

Rev. Sci. Instrum. 28, 465 (1957); http://dx.doi.org/10.1063/1.1715909 (2 pages)

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Abstract Unavailable

Ultrasonic Degassing of Liquid Scintillators

D. J. Chleck and C. A. Ziegler

Rev. Sci. Instrum. 28, 466 (1957); http://dx.doi.org/10.1063/1.1715910 (2 pages) | Cited 2 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Abstract Unavailable

Elimination of ac Beats in an Isolating Potential Comparator Circuit

T. M. Dauphinee

Rev. Sci. Instrum. 28, 467 (1957); http://dx.doi.org/10.1063/1.1715911 (2 pages) | Cited 2 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Abstract Unavailable

Brass Bellows Gauge for Null‐Reading Manometers

Michael DeCrescente and George J. Janz

Rev. Sci. Instrum. 28, 468 (1957); http://dx.doi.org/10.1063/1.1715912 (1 page) | Cited 2 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Abstract Unavailable

Unique Sliding Seal for a Vacuum Chamber

Frank I. Louckes

Rev. Sci. Instrum. 28, 468 (1957); http://dx.doi.org/10.1063/1.1715913 (2 pages)

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Abstract Unavailable

Copper Foil Trap of Improved Form

Jay Burns

Rev. Sci. Instrum. 28, 469 (1957); http://dx.doi.org/10.1063/1.1715914 (2 pages) | Cited 2 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Abstract Unavailable

Alloy‐Filled Cutoff for High Temperatures

S. Toby and K. O. Kutschke

Rev. Sci. Instrum. 28, 470 (1957); http://dx.doi.org/10.1063/1.1715915 (2 pages) | Cited 2 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Abstract Unavailable

Construction of Thin Mylar Gas Target Holders

J. C. Corelli, M. Livingston, and L. Seidlitz

Rev. Sci. Instrum. 28, 471 (1957); http://dx.doi.org/10.1063/1.1715916 (2 pages) | Cited 2 times

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Abstract Unavailable

High‐Pressure Expansion‐Diffusion Cloud Chamber

Robert H. Good, Larry O. Oswald, and Wilson M. Powell

Rev. Sci. Instrum. 28, 472 (1957); http://dx.doi.org/10.1063/1.1715917 (2 pages)

Online Publication Date: 29 December 2004

Full Text: | Download PDF

Abstract Unavailable
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close