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Study of Ionization Cooling with the MICE Experiment

Abstract

The Muon Ionization Cooling Experiment (MICE) at Rutherford Appleton Laboratory has studied ionization cooling of muons. Several million individual muon tracks have been recorded passing through a series of focusing magnets and a liquid hydrogen (LH 2 ) or lithium hydride (LiH) absorber in a variety of magnetic configurations. Identification and measurement of muon tracks upstream and downstream of the absorber are used to study the evolution of the 4D (transverse) emittance. This paper presents and discusses these results.

Published in: Forthcoming
arXiv: Forthcoming
RAL Preprint: Forthcoming
DOI: Forthcoming

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Presented at IPAC18:

Amplitude Distributions (Data)

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The number of particles of different amplitudes upstream (orange) and downstream (green) of the absorber. Histograms are normalised to the peak bin in the upstream sample. Systematic errors are shown as coloured boxes and statistical errors are shown by error bars.


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The fraction of particles enclosed by a given amplitude upstream (orange) and downstream (green) of the absorber. Histograms are normalised to the number of particles in the upstream sample. Systematic errors are shown as coloured boxes and statistical errors are shown by error bars.


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The ratio of the number of particles of different amplitudes upstream and downstream of the absorber. Systematic errors are shown as grey boxes and statistical errors are shown by error bars. An increase in the number of particles in a given region is indicated by the ratio being greater than 1.


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The ratio of the fraction of particles enclosed by a given amplitude upstream and downstream of the absorber. Systematic errors are shown as filled boxes and statistical errors are shown by error bars. Data is shown in black and simulation is shown in red. An on-average increase in the number of particles in a given region is indicated by the ratio being greater than 1.



Lattice

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The modelled and measured total magnetic field in the cooling channel as a function of distance along the channel. A cusp is visible near to the absorber, where the longitudinal field changes polarity between upstream and downstream.

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The modelled and measured total magnetic field in SSU.

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The modelled and measured total magnetic field in SSD.



Sample Selection

The sample is shown with all cuts except the given cut applied. The vertical line marks the position of the cut on the data.

Upstream Sample

The sample selection for the upstream sample, before the absorber, is shown.


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The chi2 per degree of freedom in the upstream tracker


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The maximum radius of fitted tracks in any station in the upstream tracker


In preparation


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The time of flight of particles as they travel between TOF0 and TOF1


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The radius of particles at the upstream edge of the diffuser


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The radius of particles at the downstream edge of the diffuser

Downstream Sample

The sample selection for the downstream sample, after the absorber, is shown.


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The chi2 per degree of freedom in the downstream tracker


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The maximum radius of fitted tracks in any station in the downstream tracker


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The momentum measured in the downstream tracker



Measured Beam

The samples are shown after all selections have been applied.

Upstream

Beam distributions at the upstream tracker reference plane

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The particle horizontal positions measured at the upstream tracker reference plane


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The particle vertical positions measured at the upstream tracker reference plane


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The particle horizontal momenta measured at the upstream tracker reference plane


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The particle vertical momenta measured at the upstream tracker reference plane


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The particle total momenta measured at the upstream tracker reference plane


Downstream

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The particle horizontal positions measured at the downstream tracker reference plane


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The particle vertical positions measured at the downstream tracker reference plane


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The particle horizontal momenta measured at the downstream tracker reference plane


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The particle vertical momenta measured at the downstream tracker reference plane


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The particle total momenta measured at the downstream tracker reference plane



Updated by Boyd, Steven over 3 years ago ยท 38 revisions