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Browsing Conference papers by Author "Norem, J."

Now showing items 1-12 of 12

Advanced Surface Polishing For Accelerator Technology Using Ion Beams

Insepov, Z.; Norem, J.; Hassanein, A.; Wu, A. T. (American Institute of Physics, 2009-03)

Surface erosion problems are common in the development of TeV accelerators, fusion and fission reactors, semiconductor, optical and magnetic storage devices, and Extreme Ultra-Violet (EUV) lithography devices. We have ...
A General Model of Vacuum Arcs in Linacs

Norem, J.; Insepov, Z. (Proceedings of NAPAC2016, Chicago, IL, USA, 2017-01)

We are developing a general model of breakdown and gradient limits that applies to accelerators, along with other high field applications such as power grids and laser ablation. We have considered connections with failure ...
Breakdown in RF cavities

Norem, J.; Hassanein, A.; Insepov, Z.; Konkashbaev, I. (Proceedings of 2005 Particle Accelerator Conference, Knoxville, Tennessee, 2005)

We present a simple model of breakdown in rf cavities. For most events this involves tensile stress and tensile strength, however other effects can also contribute. We discuss the effects of different materials, fatigue, ...
Computational problems in modeling arcs

Norem, J.; Insepov, Z. (American Institute of Physics, 2016-10)

We explore the reasons why there seems to be no common model for vacuum arcs, in spite of the importance of the field and the level of effort expended over more than one hundred years.
High Surface Fields in Superconducting rf Cavities. In Proceedings of SRF

Norem, J.; Insepov, Z.; Bauer, P.; Seidman, D.N.; Sebastian, J.; Yoon, K. (Proceedings of the 12th International Workshop on RF Superconductivity, Cornell University, 2005)

Field emission in cavities requires electric fields that can be high enough to damage materials. We outline a model of breakdown and field emission from local asperities, and show how electric field effects, and field ...
Ion Solid Interaction And Surface Modification At RF Breakdown In High‐Gradient Linacs

Insepov, Z.; Norem, J.; Veitzer, S. (American Institute of Physics, 2011-06)

Ion solid interactions have been shown to be an important new mechanism of unipolar arc formation in high-gradient rf linear accelerators through surface self-sputtering by plasma ions, in addition to an intense surface ...
Modeling arcs

Insepov, Z.; Norem, J.; Vetizer, S.; Mahalingam, S. (American Institute of Physics, 2011-12)

Although vacuum arcs were first identified over 110 years ago, they are not yet well understood. We have since developed a model of breakdown and gradient limits that tries to explain, in a self-consistent way: arc triggering, ...
Modeling vacuum arcs in linac structures

Norem, J.; Moretti, A.; Insepov, Z.; Nurkenov, S. (Proceedings of PAC2013, Pasadena, 2013)

We describe our vacuum arc model, which divides breakdown into four stages: trigger, plasma formation, plasma evolution and surface damage. We have modeled all four stages numerically and find that the properties of surface ...
Simulations of Fast X-Ray Detectors Based on Multichannel Plates

Adams, B.; Insepov, Z.; Ivanov, V.; Norem, J. (Proceedings of IPAC2012, New Orleans, Louisiana, 2012)

High-performance detectors with high spatial and time resolutions are required in applications such as imaging of fast processes, time-resolved coherent scattering, and time-resolved X-ray spectroscopy. Recently a new type ...
The Interactions of Surface Damage on RF Cavity Operation

Norem, J.; Bross, A.; Hassanein, A.; Qian, Z.; Yoon, K. E.; Moretti, A.; Li, D. (Fermilab, 2006-06)

Studies of low frequency RF systems for muon cooling has led to a variety of new techniques for looking at dark currents, a new model of breakdown, and, ultimately, a model of RF cavity operation based on surface damage. ...
The problem of RF gradient limits

Norem, J.; Insepov, Z.; Huang, D.; Mahalingam, S.; Veitzer, S. (American Institute of Physics, 2010-03)

We describe breakdown in rf accelerator cavities in terms of a number of mechanisms. We divide the breakdown process into three stages: 1) we model surface failure using molecular dynamics of fracture caused by electrostatic ...
Vacuum arcs and gradient limits

Norem, J.; Moretti, A.; Insepov, Z. (Proceedings of 2011 Particle Accelerator Conference, New York, 2011)

We have been extending and refining our model of vacuum breakdown and gradient limits and describe recent developments. The model considers a large number of mechanisms, but finds that vacuum arcs can be described fairly ...