“Of the Coming of John”

Lemke, Sieglinde

doi:10.1017/ccol9780521871518.003

Cited by 16 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However the capsule will have more open diagnostic access, and will be far from the irreproducible Z-pinch instabilities which might affect the other hohlraum concepts. Proposed by Hammer et al [453] it is the configuration studied most for IFE (inertial fusion energy) [428], and two Z-pinches each of >60 MA will likely be required [454]. In a 17 mm diameter and 15 mm high hohlraum driven by a single pinch, a radiation temperature of 90 ± 5 eV has been obtained [5].…”

Section: The Vacuum Hohlraummentioning

confidence: 99%

A review of the denseZ-pinch

Haines

2011

Plasma Phys. Control. Fusion

388

184

View full text Add to dashboard Cite

The Z-pinch, perhaps the oldest subject in plasma physics, has achieved a remarkable renaissance in recent years, following a few decades of neglect due to its basically unstable MHD character. Using wire arrays, a significant transition at high wire number led to a great improvement in both compression and uniformity of the Z-pinch. Resulting from this the Z-accelerator at Sandia at 20 MA in 100 ns has produced a powerful, short pulse, soft x-ray source >230 TW for 4.5 ns) at a high efficiency of ∼15%. This has applications to inertial confinement fusion. Several hohlraum designs have been tested. The vacuum hohlraum has demonstrated the control of symmetry of irradiation on a capsule, while the dynamic hohlraum at a higher radiation temperature of 230 eV has compressed a capsule from 2 mm to 0.8 mm diameter with a neutron yield >3 × 10 11 thermal DD neutrons, a record for any capsule implosion. World record ion temperatures of >200 keV have recently been measured in a stainless-steel plasma designed for Kα emission at stagnation, due, it was predicted, to ion-viscous heating associated with the dissipation of fast-growing short wavelength nonlinear MHD instabilities. Direct fusion experiments using deuterium gas-puffs have yielded 3.9×10 13 neutrons with only 5% asymmetry, suggesting for the first time a mainly thermal source. The physics of wire-array implosions is a dominant theme. It is concerned with the transformation of wires to liquid-vapour expanding cores; then the generation of a surrounding plasma corona which carries most of the current, with inward flowing low magnetic Reynolds number jets correlated with axial instabilities on each wire; later an almost constant velocity, snowplough-like implosion occurs during which gaps appear in the cores, leading to stagnation on the axis, and the production of the main soft-x-ray pulse. These studies have been pursued also with smaller facilities in other laboratories around the world. At Imperial College, conical and radial wire arrays have led to highly collimated tungsten plasma jets with a Mach number of >20, allowing laboratory astrophysics experiments to be undertaken. These highlights will be underpinned in this review with the basic physics of Z-pinches including stability, kinetic effects, and finally its applications.

show abstract

Section: The Vacuum Hohlraummentioning

confidence: 99%

A review of the denseZ-pinch

Haines

2011

Plasma Phys. Control. Fusion

388

184

View full text Add to dashboard Cite

show abstract

“…Since the famous tower observations by Galileo, the independence of the dynamics on the mass of a test body in a gravitational field has been verified in numerous physical experiments [1,2]. This striking property of test matter, later on termed "equivalence principle", was put by Einstein at the foundation of General Relativity theory, further generalizations also encompass classical and quantum extensions of General Relativity [3][4][5][6][7][8]. Tests of the equivalence principle are therefore of fundamental importance for relativistic gravitational theories.…”

Section: Introductionmentioning

confidence: 99%

Equivalence principle in scalar-tensor gravity

Puetzfeld

Obukhov

2015

Phys. Rev. D

View full text Add to dashboard Cite

We present a direct confirmation of the validity of the equivalence principle for unstructured test bodies in scalar tensor gravity. Our analysis is complementary to previous approaches and valid for a large class of scalar-tensor theories of gravitation. A covariant approach is used to derive the equations of motion in a systematic way and allows for the experimental test of scalar-tensor theories by means of extended test bodies.Comment: 5 pages, RevTex forma

show abstract

“…Insulation failures of power cables always occur during operation at normal voltage or as a result of a transient voltage spike due to lighting or switching surges, the failures also can occur when the bulk dielectric materials degrade to the point where it cannot withstand the applied voltage. For on-site testing of extruded cables, withstand stress were developed such as classic continuous AC or very-low-frequency on-site test [2][3][4]. It is know that an overvoltage test will not always uncover all manufacturing and installing problems, what also should be mentioned that a test may damage the insulation ever if a failure does not occur, also failures will happen after a successful withstand stress testing at overvoltage within in a few months in service, there is a possibility of a failure occurring if the test were to be continued for another few minutes.…”

Section: Introductionmentioning

confidence: 99%

Testing and Diagnosis of Extra High Voltage Power Cables Using Damped AC Voltages Combined with Distributed Partial Discharge Measurement

Yan

Zhou

Chen

et al. 2014

AMR

View full text Add to dashboard Cite

State assessment method of cables with extruded insulation and their accessories, DAC withstand test combined with a diagnostic test (such as PD measurement) has two shortcomings, the output voltage is not high enough for EHV cables, it cannot detect and locate PD effectively when defects are far away from signal acquisition point. This paper focus on DAC voltages up to 250kV and a kind of distributed measurement of PD. Defects existing in arbitrary of tested cable can be accurately measured in theory by installing sensor at intervals along the tested cable. This method has been validated on a long extra high voltage cross-linked polyethylene (XLPE) insulated underground cable circuit and the filed PD test has been completed successfully.

show abstract

“Of the Coming of John”

Cited by 16 publications

References 0 publications

A review of the denseZ-pinch

A review of the denseZ-pinch

Equivalence principle in scalar-tensor gravity

Testing and Diagnosis of Extra High Voltage Power Cables Using Damped AC Voltages Combined with Distributed Partial Discharge Measurement

Contact Info

Product

Resources

About