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Study of Ionization Cooling with the MICE Experiment extended

Abstract

The Muon Ionization Cooling Experiment (MICE) has measured the evolution of beam emittance due to ionization cooling. A muon beam is focused by a large aperture solenoid onto an absorber ( Lithium hydride or liquid hydrogen). Detectors are placed upstream and downstream of the focus, enabling the phase space coordinates of each muons to be reconstructed and the change in beam emittance of ensembles of muons to be measured. Data taken during 2016 and 2017 are currently under study to evaluate the change in emittance due to the absorber for muon beams with various initial emittances, momenta, and settings of the magnetic lattice. Simulations have been used to estimate the regimes in which heating and cooling are expected and to evaluate the equilibrium emittance, at which neither heating nor cooling is observed. The results of the simulations have been compared to the measured emittance changes. The current status and the most recent results of these analyses will be presented.

2017/02-7 6mm LiH data (New)

Alpha

Optical alpha function profile in the MC truth (blue line), reconstructed MC (red squares) and data (black circles).

(pdf)

Beta

Optical beta function profile in the MC truth (blue line), reconstructed MC (red squares) and data (black circles).

(pdf)

TKU profiles

Phase space profiles of the beam at the upstream tracker reference plane.

(pdf)

TKD profiles

Phase space profiles of the beam at the downstream tracker reference plane.

(pdf)

TKU amplitude Poincaré sections

Poincaré sections of the transverse phase space at the upstream reference plane.

(pdf)

TKD amplitude Poincaré sections

Poincaré sections of the transverse phase space at the downstream reference plane.

(pdf)

Subemittance evolution

Evolution of the 9%-subemittance across the cooling channel.

(pdf)

Fractional emittance evolution

Evolution of the 9% fractional emittance across the cooling channel.

(pdf)

TKU nonparametric Poincaré sections

Poincaré sections of the nonparametric kNN density function at the upstream reference plane.

(pdf)

TKD nonparametric Poincaré sections

Poincaré sections of the nonparametric kNN density function at the downstream reference plane.

(pdf)

Density level evolution

(pdf)

Contour volume evolution

Evolution of the volume of the 9% nonparametric density contour across the cooling channel.

(pdf)

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2016/04-1.2 6mm LiH simulation (Old)

Alpha

Optical alpha function profile in the MC truth (blue line), reconstructed MC (red circles) and data (green squares).

(pdf)

Beta

Optical beta function profile in the MC truth (blue line), reconstructed MC (red circles) and data (green squares).

(pdf)

Gamma

Optical gamma function profile in the MC truth (blue line), reconstructed MC (red circles) and data (green squares).

(pdf)

Momentum selection

Effects on the various cuts on the selected longitudinal momentum distribution in the reconstructed Monte Carlo.

(pdf)

Time-of-flight selection

Effects on the various cuts on the selected time-of-flight distribution in the reconstructed Monte Carlo.

(pdf)

Emittance evolution

Evolution of the RMS emittance across the cooling channel.

(pdf)

Amplitude scatter plot

Scatter plot of the beam particles in (x, px) at the TKD station 5, the color scale represents the transverse amplitude.

(pdf)

Amplitude distribution

True amplitude distribution of the beam upstream (blue) and downstream (red) of the absorber. The binning is such that each bin represents an identical volume in the 4D phase space.

(pdf)

Subemittance evolution

Evolution of the 9%-subemittance across the cooling channel.

(pdf)

Fractional emittance evolution

Evolution of the 9% fractional emittance across the cooling channel.

(pdf)

Density estimate

Nonparametric density estimate of the beam in (x, px) at the TKD station 5, the color scale represents 4D phase space density.

(pdf)

Contour volume evolution

Evolution of the volume of the 9% nonparametric density contour across the cooling channel.

(pdf)

Updated by Drielsma, François about 4 years ago · 27 revisions