| Development of Superconducting-Cavity Stabilized Oscillators from 1971-1977. |
AUG 1977 |
|
| Authors:
STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
 | Superconducting cavities had been investigated as frequency determining elements of oscillators prior to when our work began at Stanford in 1971. Most of that work had been done at the Institute of Fundamental Electronics at the University of Paris at Orsay under the direction of Professor Septier. Although they successfully tested a number of oscillator techniques using a superconducting cavity as the frequency reference, the stability of these oscillators were ... |
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| Final Report to Office of Naval Research Contract N00014-75-C-0786. |
JAN 1977 |
|
| Authors:
STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The work on superconducting cavity development under contract to the Office of Naval Research has provided those working in this field at HEPL with an exciting and productive time, and this work has contributed immeasurably to the superconducting accelerator project at HEPL. The pioneering superconducting cavity development effort at HEPL with its excellent results encouraged other groups in the United States and in other countries (West Germany, Japan, Great Britain ... |
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| An Experimental Limit on the Time Variation of the Fine Structure Constant. |
JUN 1975 |
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| Authors:
J. P. Turneaure; S. R. Stein; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| An experimental limit is placed on the possible time variation of the fine structure constant alpha by comparing the linear frequency drift rate of an ensemble of three improved superconducting-cavity stabilized oscillators with respect to an ensemble of cesium frequency standards for a period of 12 days. |
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| Superconducting-Cavity Stabilized Oscillators of 6 x 10 to the minus 16th power Stability. |
DEC 1974 |
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| Authors:
S. R. Stein; J. P. Turneaure; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| X-band microwave oscillators stabilized with superconducting niobium cavities with loaded Q's of about 10 to the 10th power achieved short-term frequency stabilities as low as (sigma sub y) = 6 x 10 to the minus 16th power and typical long-term fractional frequency drifts of plus or minus 2 x 10 to the minus 13th power per day. |
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| The Superconducting-Cavity Stabilized Oscillator and an Experiment to Detect Time Variation of the Fundamental Constants, |
OCT 1974 |
|
| Authors:
S. R. Stein; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| A precision microwave oscillator system was developed which has a superconducting cavity as its frequency determining element. The frequency stability of the device, called the superconducting-cavity stabilized oscillator (SCSO), was studied using both spectrum analysis and period measurement techniques. For times shorter than one-thousand seconds the frequency fluctuations, as measured by the Allan variance, are smaller than for any other high stability frequency source; the noise floor of the fractional ... |
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| Experimental Studies of the Microwave Properties of 8.6 GHz Superconducting Niobium, Niobium-Tantalum, and Tantalum Cavities. |
SEP 1974 |
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| Authors:
Claude M. Lyneis; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
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| In this dissertation measurements on the surface impedance of superconducting niobium, tantalum, and a 30 at% niobium-70 at% tantalum alloy are reported. The measurements were made on X-band mode cavities at a nominal frequency of 8.6 GHz. The surface resistance and the change of surface reactance for the three materials were measured from 1.3 K up to their respective transition temperatures. These data were compared to computer calculations based on ... |
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| Recent Applications of NaI(Tl) Total Absorption Counters, |
JUN 1973 |
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| Authors:
B. L. Beron; J. F. Crawford; R. L. Ford; R. Hofstadter; E. B. Hughes; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| In recent years NaI(Tl) total absorption counters (TASC and TANC varieties) have been described in numerous publications. Following the period of major technical developments of these detectors these counters have been applied to actual experiments in high energy physics. It is the purpose of this article to show how the total absorption technique fits into the fabric of modern high energy physics. Only the most recent applications is discussed. |
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| The Development of the Superconducting Cavity Stabilized Oscillator, |
JUN 1973 |
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| Authors:
S. R. Stein; J. P. Turneeaure; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
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| A very high stability microwave oscillator system was developed which has a high Q superconducting cavity as its frequency determining element. In stabilized oscillator (SCSO), the rf power is generated by a Gunn-Effect oscillator whose frequency is electronically tuned by a varactor diode. An intermediate frequency discriminator is used to produce a feedback voltage which maintains the oscillator at the center of the cavity resonance. An improved stabilization system is ... |
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| Evidence for Surface-State-Enhanced Field Emission in RF Superconducting Cavities, |
FEB 1973 |
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| Authors:
H. A. Schwettman; J. P. Turneaure; R. F. Waites; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
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| Measurements of the x-radiation and the electron loading in a niobium cavity resonant in the TM(010) mode at 1208 MHz have been made in order to study enhanced electron field emission in superconducting cavities. Measurements have also been made of the low temperature dc electron field emission from bismuth, niobium, copper and tungsten using a configuration which approximates the point-to-plane geometry. In the rf cavity measurements, it is found that ... |
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| A Superconducting Cavity Stabilized Oscillator of High Stability, |
APR 1972 |
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| Authors:
S. R. Stein; J. P. Turneaure; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Superconducting Nb cavities of high Q have been used to stabilize Gunn-Effect oscillators. These stabilized oscillators have given an rms fractional frequency fluctuation sigma(y)(N = 2, r = 1.004, tau = 10s), of 1.2 plus or minus 0.1 x 10 to the minus 13th power for an averaging time of 10 s. (Author) |
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| Asymmetry Measurements for Neutral Pion and Positive Pion Photoproduction by Linearly Polarized Gamma Rays in the Energy Range 400-900 MeV, |
OCT 1971 |
|
| Authors:
R. W. Zdarko; E. B. Dally; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The asymmetry ratio A = sigma normal - sigma parallel/sigma normal + sigma parallel has been measured using linearly polarized gamma-rays for neutral pion photoproduction. For the reaction gamma + P yields n + Positive pion, measurements were taken for theta sub cm = 135 degrees at gamma-ray energies ranging from 390 to 909 MeV. For the reaction gamma + P yields P + neutral pion, measurements were taken for ... |
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| Some Theoretical Aspects of RF Superconductivity, |
SEP 1971 |
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| Authors:
J. P. Turneaure; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
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| The work towards the development of superconducting accelerators and particle separators has led to considerable improvement in the understanding of rf superconductivity. This paper discusses present understanding of rf superconductivity with emphasis on those topics that relate to accelerating devices. (Author) |
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| High Energy Elastic Electron Scattering from 24Mg, 28Si, and (nat)S, |
JUL 1971 |
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| Authors:
Gloria C. Li; Ingo Sick; Mason R. Yearian; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| High momentum transfer elastic electron scattering data (0.76 < or = q < or = 3.74/fm) from 24Mg, 28SI, and natS are presented and analyzed using phenomenological charge distributions; the oscillation in rho(r) due to the shell model structure is obtained. An analysis in terms of a Woods-Saxon nuclear potential is described and the 2s/1d occupation numbers are deduced. (Author) |
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| X-Ray Detection in Semiconductors and Scintillators. |
JAN 1971 |
|
| Authors:
Donald W. Aitken; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The broad objectives of the program were to carry to conclusion a long-term (six-year) research program on the properties of silicon and germanium and alkali-halide scintillation detectors as x-ray detectors; to expand knowledge about these kinds of materials; and to increase opportunity for practical applications. A particular application that was studied in detail involved the construction and flight of a prototype germanium spectrometer for x-ray observations in space physics. The ... |
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| Nuclear Fermi Momenta from Quasi-Elastic Electron Scattering, |
JAN 1971 |
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| Authors:
E. J. Moniz; I. Sick; R. R. Whitney; J. R. Ficenec; R. D. Hephart; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The cross sections for quasi-elastic electron scattering from nine target nuclei from lithium to lead have been measured for electron incident energy of 500 MeV and scattering angle of 60 degrees. The data are interpreted in terms of a Fermi gas model, yielding the nuclear Fermi momentum as a function of atomic number. The Fermi momentum increases from lithium to calcium and remains roughly constant at about 260 MeV/c from ... |
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| Electron Scattering from Aligned and Non-Aligned H6165 Nuclei, |
DEC 1970 |
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| Authors:
F. J. Uhrhane; J. S. McCarthy; M. R. Yearian; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The differential scattering cross sections have been measured for electron scattering from randomly oriented and aligned Ho165 nuclei. The alignment axis was parallel to the direction of the momentum transferred to the nucleus. Incident electron energies from 160.6 MeV to 462.2 MeV were used at a fixed polar scattering angle of 36 degrees. Available theories are unable to explain the measured difference between the aligned and non-aligned cross sections. (Author) ... |
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| Inelastic Electron Scattering from Several Ca, Ti and Fe-Isotopes. |
NOV 1970 |
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| Authors:
J. Heisenberg; J. S. McCarthy; I. Sick; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The differential cross sections for inelastic electron scattering from 40Ca, 42Ca, 44Ca, 46Ti, 48Ti, 50Ti, and 56Fe have been measured. The cross sections for the strangely excited positive 2, negative 3, positive 4, and negative 5 levels have been measured over a range of momentum transfer q of 0.4 - 2.6 (fm sup (-1)). The data have been fitted using two representations for the transition charge, (1) the hydrodynamic liquid ... |
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| EXCITATION OF PARTICLE-HOLE STATES IN 28Si BY INELASTIC ELECTRON SCATTERING AT HIGH MOMENTUM TRANSFER, |
AUG 1970 |
|
| Authors:
I. Sick; T. W. Donnelly Jr.; J. D. Walecka; G. E. Walker; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The predictions of the particle-hole model for 28Si are compared with experimental results for large-angle high-momentum-transfer inelastic electron scattering. A few high-spin T=1 states are seen to dominate the cross section. (Author) |
|
| High Energy Electron Scattering from 6Li, |
JUL 1970 |
|
| Authors:
G. C. Li; I. Sick; R. R. Whitney; M. R. Yearian; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Elastic electron scattering cross sections have been measured for 6Li at 500 MeV and values of q sup 2, the momentum transfer squared, up to 13 f(m sup (-2)). Calculations including nucleon-nucleon correlations predict a diffraction minimum beyond the range of previous measurements for 6Li. The results for 6Li do show a diffraction minimum at q sup 2 = 8 f(m sup (-2)); they are also compared with a phase ... |
|
| CHARGE DISTRIBUTION OF THE EVEN Nd-ISOTOPES, |
JUL 1970 |
|
| Authors:
J. H. Heisenberg; H. S. McCarthy; I. Sick; M. R. Yearian; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| High energy electron scattering has been used to deduce the nuclear charge distribution of the isotopes 142, 144, 146, 148, 150Nd. The measured cross sections have been fitted using a two- and a three-parameter Fermi shape. A significant increase of the surface thickness between 142Nd and 150Nd is observed. The data for 142Nd at high momentum transfer can only be fitted by introducing a modification on the charge distribution which ... |
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| MEASURED AND COMPUTED FIELDS IN THE NIOBIUM ACCELERATOR STRUCTURE, |
JUL 1970 |
|
| Authors:
Peter Bramham; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The dimensions for the niobium L-band accelerating structure were determined by measurements on copper models. These measurements related the dimensions of cells in the structure to the frequencies and coupling factors in a chain of coupled lumped-circuits. Frequencies and coupling factors were computed for a chain of eight resonant circuits forming a superperiod of structure having the desired characteristics. The superperiod was then made up of copper cells corresponding to ... |
|
| ELASTIC ELECTRON SCATTERING FROM 13C, |
JUL 1970 |
|
| Authors:
J. Heisenberg; J. S. McCarthy; I. Sick; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Cross sections for elastic scattering of electrons from the charge and magnetic distribution of 13C have been measured. The data, covering a range of q of 0.4 - 3.4 F sup (-1) are fitted by a phenomenological charge distribution. The difference between 12C and 13C is analyzed in terms of the change in parameters of the Woods-Saxom potential used in a shell model description of the nuclei. (Author) |
|
| THE ELECTROMAGNETIC STRUCTURE OF THE HE3 NUCLEUS, |
JUL 1970 |
|
| Authors:
J. S. McCarthy; I. Sick; R. R. Whitney; M. R. Yearian; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The electromagnetic structure of the He3 nucleus has been investigated by means of high energy electron scattering. A separation of the charge and magnetic form factors has been accomplished. The charge form factor data extend to q squared = 20 fm sup (-2) and exhibit a diffraction minimum at q squared = 11.6 fm sup (-2); the magnetic scattering is measured to q squared = 12.5 fm sup (-2). The ... |
|
| THE FORM FACTOR RATIO GEn/GEp AT LOW MOMENTUM TRANSFERS, |
JUL 1970 |
|
| Authors:
E. B. Dally; F. A. Bumiller; F. R. Buskirk; J. W. Stewart; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Measurements of the ratio of the deuteron-to-proton electric form factors, G(E) sub d/G(E) sub p, were made from elastic electron-deuteron scattering to a precision of approximately 1% for the range of momentum transfers, 0.10 < or = q squared < or = 0.8 f super(-2), and for electron scattering angles of 45 degrees and 120 degrees. It was found that within experimental errors the slope as obtained from the ratio ... |
|
| MECHANICAL OSCILLATIONS INDUCED BY PENETRATING PARTICLES, |
JUN 1970 |
|
| Authors:
B. L. Beron; S. P. Boughn; W. O. Hamilton; R. Hofstadter; T. W. Martin; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Investigations into the production of mechanical oscillations in aluminum cylinders by high energy electrons reveal that the mechanism of excitation is a 'hot rod model' in which the shower deposits heat in the bar and the hot zone expands causing mechanical vibrations. The conversion efficiency of this process is evaluated in these experiments. The hot rod mechanism does not present a significant background for gravitational events from cosmic rays in ... |
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| EXPERIMENTAL OBSERVATION OF A 'SPIN-SPIN EFFECT' IN THE NEUTRON TOTAL CROSS SECTION OF 59Co, |
JUN 1970 |
|
| Authors:
D. C. Healey; J. S. McCarthy; D. Parks; T. R. Fisher; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Measurements of the 'spin-spin effect' in the neutron total cross section of 59Co employing a polarized 59Co target are reported. (Author) |
|
| X-RAY AND GAMMA-RAY STUDIES OF HIGH ENERGY ELECTRON SCATTERING EVENTS USING SEMICONDUCTOR DETECTORS, |
MAY 1970 |
|
| Authors:
L. M. Middleman; R. L. Ford; R. Hofstadter; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Using high resolution semiconductor detectors, a study was made of the large K-ionization cross sections of atoms over a wide range of atomic numbers (Z = 29 to Z = 83) and of incident electron energies (E = 150 MeV to 900 MeV). For the higher Z elements (Z > 60) the L X-ray cross sections were also measured over the incident electron energy range. Ratios of the relative intensities ... |
|
| TRANSITION DENSITY OF THE OCTUPOLE VIBRATION IN 208Pb DETERMINED BY ELECTRON SCATTERING, |
APR 1970 |
|
| Authors:
J. H. Heisenberg; I. Sick; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Cross sections for the excitation by electrons of the 3- level at 2.61 MeV in 208Pb have been obtained between .5 1/F and 2.8 1/F momentum transfer. The data at small momentum transfer can be understood in terms of the modified Tassie-model. The data at high momentum transfer, however, indicate that the transition density has a detailed structure. A transition density which fits the data is presented and compared to ... |
|
| SCATTERING OF HIGH ENERGY ELECTRONS BY NITROGEN 14 AND 15, |
MAR 1970 |
|
| Authors:
E. B. Dally; M. G. Croissiaux; B. Schweitz; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Cross sections of elastic and inelastic electron scattering at incident electron energies of 250 and 400 MeV are presented. Data are given for elastic and inelastic scattering from N15 and elastic scattering from N14. The data are analyzed with the use of the shell model, in Born approximation. (Author) |
|
| MEASUREMENTS OF NEUTRAL KAON SUB L AND NEUTRON TOTAL CROSS SECTIONS ON NUCLEI AT GeV ENERGIES, |
MAR 1970 |
|
| Authors:
W. L. Lakin; E. B. Hughes; L. H. O'Neill; J. N. Otis; L. Madansky; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Measurements of neutral kaon sub L and neutron total cross sections are reported for C, Al, Cu, and Pb at average momenta of 9.0 GeV/c for neutral kaon sub L and 3.8 GeV/c for neutrons. Comparison is made with the predictions of an optical model calculation. (Author) |
|
| PROPERTIES OF A NaI(T1) TOTAL ABSORPTION SPECTROMETER FOR ELECTRONS AND Gamma-RAYS AT GeV ENERGIES, |
MAR 1970 |
|
| Authors:
E. B. Hughes; R. L. Ford; R. Hofstadter; L. H. O'Neill; J. N. Otis; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| In the past two years the authors have reported on the properties of large NaI(T1) crystals as total absorption spectrometers for electrons and gamma-rays in the range 0.1 to 14 GeV. They have recently made similar measurements on a NaI(T1) spectrometer which is both larger than any that they have used before, and assembled in a different way. The report describes the results of the initial tests. (Author) |
|
| FANO FACTOR FACT AND FALLACY, |
MAR 1970 |
|
| Authors:
H. R. Zulliger; D. W. Aitken; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| By definition, the Fano factor (F) is an intrinsic material constant which reflects the ultimate detector resolution. The paper points out the difficulties associated with Fano factor measurements; attempts to clarify the mechanisms of some apparently anomalous behavior frequently observed in solid state detectors; presents some new experimental results for F in silicon and germanium; and derives a phenomological model for the average energy expended to produce an electron-hole pair ... |
|
| M5 AND HIGHER MAGNETIC MOMENTS IN ELASTIC ELECTRON SCATTERING, |
1970 |
|
| Authors:
G. C. Li; I. Sick; J. D. Welecke; G. E. Walker; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Consideration is given to the feasibility of determining the higher nuclear ground state magnetic moments through elastic electron scattering. Theoretical and experimental results are presented for the M5 moment of 27Al and the M9 moment of 209Bi. (Author) |
|
| A POLARIZED 59Co TARGET USING A 3He-4He DILUTION REFRIGERATOR, |
NOV 1969 |
|
| Authors:
J. S. McCarthy; R. Whitney; D. C. Healey; D. Parks; T. R. Fisher; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| A 3He-4He dilution refrigerator has been used to cool a 32 gram polycrystalline cobalt rod to 0.034 degrees K. The rod is held in a longitudinal magnetic field of 6.5 kOe and has a nuclear polarization of 0.38. The cobalt piece will be used to study the scattering of polarized and unpolarized fast neutrons from polarized 59Co. (Author) |
|
| SUPERCONDUCTING Nb TM sub (010) MODE ELECTRON-BEAM WELDED CAVITIES, |
OCT 1969 |
|
| Authors:
J. P. Turneaure; Nguyen Tuong Viet; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| A number of electron-beam welded TM sub (010) mode superconducting Nb cavities were fabricated and tested at 8.6 GHz and 1.25 degrees K. These cavities were electron beam (EB) welded to avoid the difficulties of machining cavities without joints and to determine the usefulness of EB welding as a fabrication technique. Measurements demonstrate that high fields and unloaded Q's (Q sub 0)'s can be obtained with these EB welded cavities. ... |
|
| ELASTIC ELECTRON SCATTERING FROM 12C AND 16O. |
OCT 1969 |
|
| Authors:
I. Sick; J. S. McCarthy; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Electron scattering cross sections for Carbon and Oxygen between q = 1 F to the minus 1 power and 4 F to the minus 1 power are given. The data are analyzed in terms of a phenomenological charge distribution and new information concerning the tail and the center of the charge distribution are obtained. The presence of dispersion effects appears to be necessary to explain the cross sections in the ... |
|
| STATUS AND DEVELOPMENT OF SUPERCONDUCTING 2+ GeV ACCELERATOR AT HEPL, |
AUG 1969 |
|
| Authors:
E. E. Chambers; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The paper discusses the resolution of the problems encountered in the design and proposed operation of a superconducting linear accelerator. |
|
| RECIRCULATION AT THE STANFORD HIGH ENERGY PHYSICS LABORATORY, |
AUG 1969 |
|
| Authors:
Eifionydd Jones; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The length of the superconducting electron accelerator under construction at the High Energy Physics Laboratory is limited to some 500 feet. A conservative estimate of the final beam energy would then appear to be 2 GeV. The 'newest' end-station, with very little rearrangement of the presently envisaged layout of experimental apparatus, may easily contain a 74 ft diameter 180 degrees bending magnet system. A second 180 degrees bend tunneled underneath ... |
|
| ELECTROEXCITATION OF PARTICLE-HOLE STATES IN O16, |
JUL 1969 |
|
| Authors:
I. Sick; E. B. Hughes; T. W. Donnelly; J. D. Walecka; G. E. Walker; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The paper presents experimental data and theoretical results for electroexcitation of T=1 particle-hole states in 016. |
|
| SUGGESTED DEVICE FOR PRECISE MEASUREMENT OF PARTICLE TRAJECTORIES, |
JUL 1969 |
|
| Authors:
Robert Hofstadter; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| A suggested device for particle detection and measurement is described in which the intersection of a high energy particle's trajectory with a detecting plane may be measured with a potential precision of O.Olmm or better. (Author) |
|
| GENERATION OF MECHANICAL VIBRATIONS BY PENETRATING PARTICLES, |
JUN 1969 |
|
| Authors:
B. L. Beron; R. Hofstadter; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Mechanical, or sound, vibrations were observed in ceramic piezoelectric disks of lead-zirconate-titanate (PZT) struck by high energy electrons. Four 1/2 inch thick disks of PZT were used. A wide band, low impedence, common base configuration amplifier was used to examine the induced vibrations. Since the most prominent resonant frequencies of the disks were near 40 kHz (radial mode) and 158 kHz (compressional mode) most of the studies were concentrated on ... |
|
| OBSERVATIONS ON THE TOTAL ABSORPTION OF ELECTRONS AND PIONS IN MATTER AT GeV ENERGIES, |
JUN 1969 |
|
| Authors:
E. B. Hughes; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| General remarks are given on the subject of total absorption, then indicate why such observations were pursued into the GeV range, and finally the observations themselves are discussed and what have been learned from them. For both electrons and pions the principal concern was to determine the spatial distribution of the energy deposited within an absorber, on the one hand by the electromagnetic cascade and on the other by the ... |
|
| ELASTIC ELECTRON SCATTERING EXPERIMENTS WITH N15, |
MAY 1969 |
|
| Authors:
E. B. Dally; M. G. Croissiaux; B. Schweitz; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The nucleus of N15 was investigated by the electron scattering technique at incident energies of 250 and 400 MeV. The first diffraction minimum was observed and measured. The data were analyzed by using two nuclear charge density distributions; the Fermi model and the shell model. A value for the radius and skin thickness of the N15 nucleus is given although the data do not fit the diffraction minimum. (Author) |
|
| PRODUCTION OF POLARIZED ELECTRON BEAMS, |
APR 1969 |
|
| Authors:
K. Jost; H. D. Zeman; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| A survey of proposed and working methods for producing spin polarized electron beams is presented. An 'effective intensity' and an 'effective brightness' for sources of polarized electrons are derived. These quantities serve as figures of merit to compare the utility of the sources presently available. (Author) |
|
| REPORT ON THE PERFORMANCE OF THE SUPERCONDUCTING INJECTOR FOR THE STANFORD LINEAR ACCELERATOR, |
MAR 1969 |
|
| Authors:
E. Jones; M. S. McAshan; L. R. Suelzle; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The report describes some recent experiments performed with a prototype of the injector section eventually to be used in conjunction with the superconducting linear accelerator at Stanford University. (Author) |
|
| TOTAL ABSORPTION DETECTORS FOR HIGH AND SUPER-HIGH ENERGY PHYSICS, |
MAR 1969 |
|
| Authors:
Robert Hofstadter; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Contents: TASC detectors for 'electromagnetic' or Type A particles; Performance of TASC detectors; TANC detectors for 'strongly interacting' or Type B particles; Outlook for the future. |
|
| SPIN-SPIN EFFECT IN THE 165HO TOTAL NEUTRON CROSS SECTION AT ENERGIES OF 0.4 and 1.0 MEV, |
MAR 1969 |
|
| Authors:
T. R. Fisher; D. C. Healey; J. S. McCarthy; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| Several recent attempts have been made to observe a change in the total neutron cross section of 165Ho resulting from the reversal of the relative orientations of the neutron and 165Ho spins. The paper reports measurements of the spin correlation effect, or spin-spin effect, at the neutron energies 0.4 and 1.0 Mev. The results of new calculations for the spin-spin effect for neutron energies less than 8 Mev are also ... |
|
| X-RAY DETECTION IN SEMICONDUCTORS AND SCINTILLATORS. |
01 JAN 1969 |
|
| Authors:
Donald W. Aitken; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The broad objectives of the program were to investigate alkali-halide scintillators and silicon and germanium radiation detectors with x rays and charged particles, to determine intrinsic physical properties while also leading to new practical applications of these devices in the low energy x-ray region. The report summarizes the work actually performed and the new directions and applications that resulted from the work, and concludes that the objectives of the originally ... |
|
| ON THE DESIGN OF NaI(T1) TOTAL ABSORPTION DETECTORS FOR STRONGLY INTERACTING PARTICLES AT GEV ENERGIES, |
JAN 1969 |
|
| Authors:
E. B. Hughes; R. Hofstadter; W. L. Lakin; I. Sick; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The properties of a large NaI(T1) detector as a total absorption detector for pions at GeV energies are reported. These observations are supplemented by measurements on the three-dimensional distribution of deposited energy in a large absorber of metallic tin by 8 GeV pions. The latter data are compared with existing Monte Carlo calculations of the nucleon-meson cascade and their application to the design of total absorption detectors with large containment ... |
|
| THE CORRECTION OF SCATTERED-ELECTRON SPECTRA FOR RADIATIVE EFFECTS, |
JAN 1969 |
|
| Authors:
Hall Crannell; STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
|
| The distortions caused by the effects of nuclear and thick-target bremsstrahlung on the spectrum of scattered electrons obscure the actual elastic and inelastic cross sections. A method whereby the spectrum can be systematically corrected for these effects is presented. The method uses previous theoretical calculations of the radiative probabilities and employs an iterative technique for step by step correction of the spectrum. Uncertainties due to statistical errors in the measurement ... |
|
Reports by Corporate Author
