Light emission phenomena in superconducting niobium cavities

Delayen, Jean; Mammosser, J.

doi:10.1109/pac.1999.795402

Cited by 4 publications

(10 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed orbits were occasionally nearly perfect ellipses, but usually they manifested distortions of various kinds, i:e:; the class 2 irregular-shaped closed orbits" referred to in Ref. 1 . This indicates that more than one type of force is at work, or there is a time varying force, or some nonlinear spatial force, or perhaps all of the above.…”

Section: Theoreticalmentioning

confidence: 98%

See 1 more Smart Citation

A small particle model as a possible explanation of recently reported cavity lights

Fryberger

2001

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

Very unusual light phenomena have been observed inside superconducting niobium cavities under an electrical excitation equivalent t o a n a v erage acceleration of 4 MV m.Of particular interest is the observation of what appear to be objects executing elliptical orbits. A small particle model that yields a cylindrical harmonic oscillator potential well inside such a c a vity is developed and appears to o er considerable promise as an analytical framework in which to understand these observations; the harmonic oscillator potential well has elliptical orbits as general solutions. However, explicit calculations indicate that with the cavity excitation parameters associated with this data, it is highly unlikely that a small object orbiting in such a potential well can bemade of any known material. De ciencies of the model are discussed, and avenues for further study, both theoretical and experimental, are indicated. PACS: 46.90 +s; 52.80 Mg

show abstract

Section: Theoreticalmentioning

confidence: 98%

“…These phenomena were observed with a CCD camera 1 of an investigation of the eld emission limitation of superconducting niobium cavities. In these tests, the CCD camera was mounted in a vertical cryogenic test dewar looking up into the cavities along the cavity axis.…”

Section: Introductionmentioning

confidence: 99%

A small particle model as a possible explanation of recently reported cavity lights

Fryberger

2001

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

show abstract

“…The characteristic length a is of the order of the radius of the iris. The field (1) satisfies Maxwell equations with the accuracy of the neglected terms.…”

Section: Charged Particle In the Rf Fieldmentioning

confidence: 99%

“…However, in a multicell cavity a charged particle can have a stable trajectory. To verify this possibility, we calculate particle trajectories in the CEBAF 5-cell cavity [1]. We include all field components in computer simulations.…”

Section: A a Multicell Cavitymentioning

confidence: 99%

“…In this paper, we study the stability of the motion of charged particles and dust particles in a single-cell and multicell rf cavity. The paper is inspired by the observation of light emitting filaments during the power test of the niobium superconducting cavities [1]. The glowing filament of light was observed by a CCD camera installed at the end of a single-cell 1500 MHz cavity when operating the cavity in field emission regime.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Trapping of charged and dust particles in the rf field of a superconducting cavity

Novokhatski

Heifets

2018

Phys. Rev. Accel. Beams

View full text Add to dashboard Cite

We suggest an explanation of the observations of the glowing filaments in a superconducting cavity. We show that the motion of a charged particle in a multicell rf cavity and of a dust particle in a single-cell rf cavity can be stable. The analysis of stability is illustrated by numerical calculations. This effect may also explain the possible failure of high gradient tests of superconducting cavities, which are planned to be used in the linear accelerators for XFEL.

show abstract

Mapping of Ambient Magnetic Fields within Liquid Helium Dewar for Testing of a DC SQUID Magnetometer

Newhouse¹

2003

View full text Add to dashboard Cite

Light emission phenomena in superconducting niobium cavities

Cited by 4 publications

References 2 publications

A small particle model as a possible explanation of recently reported cavity lights

A small particle model as a possible explanation of recently reported cavity lights

Trapping of charged and dust particles in the rf field of a superconducting cavity

Mapping of Ambient Magnetic Fields within Liquid Helium Dewar for Testing of a DC SQUID Magnetometer

Contact Info

Product

Resources

About