The emittance is an important characteristic of propagating charged particle beams, because it allows the prediction of focus size and beam losses After introducing the concept and various definitions of the emittance and Twiss parameters, useful applications of this representation will be explored for the transverse emittances of charged particle beams This is followed by a presentation of different measuring methods, together with their advantages and disadvantages The second part discusses the analysis of emittance data, and possible mitigations for effects introduced by noise, bias, and other artifacts

/pdf/measuring-and-analyzing-the-transverse-emittance-of-charged-3aq3g0to7n.pdf

Measuring and Analyzing the Transverse Emittance of Charged Particle Beams

An inductively coupled plasma source for a focused charged particle beam system includes a dielectric liquid that insulates and cools the plasma chamber. A flow restrictor at an electrical potential that is a large fraction of the plasma potential reducing arcing because the voltage drop in the gas occurs primarily at relative high pressure.

Plasma source for charged particle beam system

An inductively-coupled plasma source for a focused charged particle beam system includes a conductive shield that provides improved electrical isolation and reduced capacitive RF coupling and a dielectric fluid that insulates and cools the plasma chamber. The conductive shield may be enclosed in a solid dielectric media. The dielectric fluid may be circulated by a pump or not circulated by a pump. A heat tube can be used to cool the dielectric fluid.

Encapsulation of electrodes in solid media for use in conjunction with fluid high voltage isolation

An inductively coupled plasma source for a focused charged particle beam system includes a conductive shield within the plasma chamber in order to reduce capacitative coupling to the plasma. The internal conductive shield is maintained at substantially the same potential as the plasma source by a biasing electrode or by the plasma. The internal shield allows for a wider variety of cooling methods on the exterior of the plasma chamber.

Internal split faraday shield for a plasma source

A magnetic 2-source LEBT is proposed for the Spallation Neutron Source Power Upgrade. It allows for switching between the two ion sources within less than an hour. The high-current H- beam is transported and injected into the RFQ. A transverse electric chopper at the entrance of the RFQ chops ~300 ns beam every ~1 mus. Beam envelope calculations show that the new LEBT is robust because it is capable of perfectly matching the beam into the RFQ for broad ranges of the parameters describing the input beam. Physics design of the individual elements of this new LEBT is also presented.

The new LEBT for the spallation neutron source power upgrade project

The baseline Spallation Neutron Source (SNS) accelerator complex, consisting of an H- injector, a 1 GeV linear accelerator, and an accumulator ring, will provide a 1 GeV, 1.44 MW proton beam to a liquid mercury target for neutron production. Even in the baseline design, many of the accelerator subsystems are capable of supporting higher beam intensities and higher beam energy. Upgrades to the SNS accelerator and target systems to increase the beam power to at least 2 MW, with a design goal of 3 MW, are in the planning stages. The upgrade beam parameters will be presented and the required hardware modifications will be described.

https://epaper.kek.jp/e06/papers/mopch129.pdf

Status of the sns beam power upgrade project

The Spallation Neutron Source (SNS) [1] comprises a 1.5-MW, 60-Hz, 1-GeV linac, an accumulator ring, associated beam lines, and a spallation neutron target. Construction began in 1999 and the project is on track to be completed in June 2006. By September 2005 the facility was commissioned through the end of the superconducting linac, and in January 2006 commissioning began on the High Energy Beam Transport beam line, the accumulator ring, and the Ring to Target Beam Transport beam line up to the Extraction Beam Dump. On April 28, beam was delivered to the spallation target for the first time. In this paper we will discuss early results from ring commissioning.

SNS ring commissioning results

This paper presents a computational investigation of the electron-proton instability in the Spallation Neutron Source (SNS) ring. The simulations have been performed using the ORBIT code, which includes a self-consistent electron-cloud model for long-bunched proton beams. The model features simultaneous calculations of the dynamics of the proton bunch, the electron cloud and a realistic secondary emission surface model. The frequency spectra and growth rates of the proton bunch transverse instability are studied as functions of the RF cavity voltage.

Electron cloud self-consistent simulations for the sns ring

SNS warm linac commissioning results

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Status of the sns beam power upgrade project

SNS ring commissioning results

Electron cloud self-consistent simulations for the sns ring

SNS warm linac commissioning results

SNS warm linac commissioning results