摘要:

An optical diagnostic is reported which measures the parameters of an intense hydrogen or deuterium neutral beam by observation of the Doppler shifted Balmer alpha or beta lines emitted by fast atoms in the beam at several locations in the neutralizer. The spectrum of blue shifted and red shifted light emitted along optic axes which lie in planes perpendicular and parallel to the grid rails of the ion source is recorded by an optical multichannel analyzer which is interfaced to a computer. The light is Doppler shifted sufficiently to resolve the three energy components of the beam resulting from the H+, H+2, and H+3ions accelerated by the ion source. From the Doppler broadening of each peak the beam divergence parallel and perpendicular to the accelerator slots can be measured. A model is presented whereby the energy distribution can be determined from the intensity of each peak. The spectroscopic results for energy distribution are in agreement to within 5% with momentum analysis by a magnetic mass spectrometer.

ISSN:0034-6748    

DOI:10.1063/1.1136124

出版商:AIP    

年代:1980

数据来源: AIP

摘要:

A new variation of a duoPIGatron ion source, named coaxial duoPIGatron has been proposed and designed. This ion source has a magnetic center pole in the intermediate electrode, thereby feeding ionizing electrons widely to the arc chamber. The first model had produced a source plasma of excellent uniformity, but the density level was low presumably due to leakage or bridging magnetic flux in the cathode plasma region. Numerical calculations have been performed on the magnetic field structure for several shapes of the intermediate electrode with center pole. The source was designed and constructed on the basis of these numerical results and was tested experimentally. It was confirmed that the primary electrons were fed widely to the PIG chamber along the spreading magnetic lines of force, and they produced a uniform source plasma with high density. Thus the concept of hollow feeding of electrons has proved its applicability to an ion source of larger beam extracting area.

ISSN:0034-6748    

DOI:10.1063/1.1136125

出版商:AIP    

年代:1980

数据来源: AIP

摘要:

A hollow cathode which utilizes lanthanum molybdenum (LM) as the active electron emitter is described and compared in performance to a LaB6emitter of equal area in an identical configuration. Tests in both argon and hydrogen produced effective emission current densities of up to 10 A/cm2from the LM material in continuous and long pulse operation. Examination after 40 h running time showed no sign of damage or rapid evaporation. Impurity build up on the emitting surfaces which stopped the LaB6emission after 50 h was not apparent with the LM and long lifetimes are anticipated for cathodes using this emitter.

ISSN:0034-6748    

DOI:10.1063/1.1136126

出版商:AIP    

年代:1980

数据来源: AIP

摘要:

A thermionic source of singly charged alkali ions consisting of an aluminosilicate‐molybdenum emitter assembly rigidly mounted behind a Pierce‐type electrostatic focusing structure is described. This ion source is compatible with an ultra‐high vacuum environment and has generated intense, high purity ion beams for a continuous operating period of one month.

ISSN:0034-6748    

DOI:10.1063/1.1136127

出版商:AIP    

年代:1980

数据来源: AIP

摘要:

A high frequency response Faraday cup array has been developed to measure the beam profile and high frequency wave behavior of the Auto‐Resonant Accelerator electron beam.

ISSN:0034-6748    

DOI:10.1063/1.1136128

出版商:AIP    

年代:1980

数据来源: AIP

摘要:

Commercial viability of inertial fusion (IF) requires high volume, low cost manufacture of the reactor targets. An important aspect of the manufacturing process is quality assurance of the hollow, spherical fuel containers used as targets. This report presents a rolling technique that can characterize and sort for wall uniformity rapidly and economically. We have demonstrated that shells having offset inner spheres roll at an angle down an inclined plane in accordance with a straightforward mathematical model.

ISSN:0034-6748    

DOI:10.1063/1.1136129

出版商:AIP    

年代:1980

数据来源: AIP

摘要:

A simple differential technique using a floating Langmuir probe and a hot probe has been used to obtain direct oscillographic display of electron temperature oscillation in a plasma. The reliability of the method has been tested in artificially generated moving striations in the positive column of a cold cathode argon discharge (Id=8 mA;p=0.1 torr; 2r=5 cms).

ISSN:0034-6748    

DOI:10.1063/1.1136130

出版商:AIP    

年代:1980

数据来源: AIP

摘要:

We have designed and constructed a compact and simple high current relativistic electron beam (REB) generator for the excitation of lasers in the short wavelength region. The REB generator mainly consists of Tesla transformer type high‐voltage generator, water pulse forming line, cold cathode electron gun and provides the operational characteristics of 250 keV high energy, 15 kA high current and 15 ns pulse width electron beam.

ISSN:0034-6748    

DOI:10.1063/1.1136108

出版商:AIP    

年代:1980

数据来源: AIP

摘要:

A Michelson interferometer with step‐and‐integrate mirror motion is described for use in Fourier transform photoacoustic spectrometry (FTPAS) at visible wavelengths. An overview of mechanical and software construction is supplied and the advantages of FTPAS are illustrated with a spectrum of powdered erbium oxide at visible wavelengths. The relative merits of step‐and‐integrate and rapid scan mirror motion for FTPAS are considered.

ISSN:0034-6748    

DOI:10.1063/1.1136109

出版商:AIP    

年代:1980

数据来源: AIP

摘要:

A unique method for obtaining angular resolved Raman spectra is described, the purpose of which will be to study the angular dependence of the surface enhanced Raman effect from molecules adsorbed on metal substrates. Our design employs two flexible fiber optic bundle probes which are optically coupled to the laser and the monochromator respectively. The probes which define the incident and detected angular resolution at 20°, can be independently positioned in 45° azimuthal angle increments and at 0°, 22 1/2°, 45°, and 67 1/2° with respect to the sample surface normal. In a test of the performance of the system, the angular dependence of the Raman intensity from the 992 cm−1mode of benzene was recorded. The results are in excellent agreement with previous data, thus demonstrating the practicality of our device.

ISSN:0034-6748    

DOI:10.1063/1.1136110

出版商:AIP    

年代:1980

数据来源: AIP