Demonstration of Reverse Emittance Exchange in MICE » History » Revision 12
Revision 11 (Mohayai, Tanaz Angelina, 14 August 2018 19:27) → Revision 12/14 (Mohayai, Tanaz Angelina, 15 August 2018 00:24)
h1. Demonstration of Reverse Emittance Exchange in MICE (Preliminary)
{{toc}}
h2. Abstract
bq.
Published in: Forthcoming
arXiv: Forthcoming
RAL Preprint: Forthcoming
DOI: Forthcoming
BibTeX
References
Source
----
*Presented at "NuFact18":https://indico.phys.vt.edu/event/34/timetable/?view=standard:*
* Yagmur Torun's presentation:
** Presentation: attachment:forthcoming
* Paul Soler's presentation:
** Presentation: attachment:forthcoming
----
h2. x vs pz (Data)
!hist2d_data_us_x_pz_2.png! attachment:hist2d_data_us_x_pz_2.png
!x_p_us_hist_data_1.png! attachment:x_p_us_hist_data_1.png
_The distribution of pz vs x upstream of the absorber_
!hist2d_data_ds_x_pz_2.png! attachment:hist2d_data_ds_x_pz_2.png
!x_p_ds_hist_data_1.png! attachment:x_p_ds_hist_data_1.png
_The distribution of pz vs x downstream of the absorber. The downstream muon sample has a more spread-out longitudinal momentum as a result of reverse emittance exchange._
----
h2. x vs pz and density versus average beam radius (MC recon)
!hist2d_mc_us_x_pz_2.png! attachment:hist2d_mc_us_x_pz_2.png
!x_p_us_hist_mc_recon_1.png! attachment:x_p_us_hist_mc_recon_1.png
_The distribution of pz vs x upstream of the absorber_
!hist2d_mc_ds_x_pz_2.png! attachment:hist2d_mc_ds_x_pz_2.png
!x_p_ds_hist_mc_recon_1.png! attachment:x_p_ds_hist_mc_recon_1.png
_The distribution of pz vs x downstream of the absorber. The downstream muon sample has a more spread-out longitudinal momentum as a result of reverse emittance exchange._
!density_vs_volume_mc_recon_long_1.png! attachment:density_vs_volume_mc_recon_long_1.png
!density_vs_volume_mc_recon_long_2.png! attachment:density_vs_volume_mc_recon_long_2.png
!density_vs_volume_mc_recon_long_3.png! attachment:density_vs_volume_mc_recon_long_3.png
_The distribution of density of each phase-space contour, as measured with the kernel density estimation technique vs the contour volume, as measured with the kernel density estimation and the Monte Carlo volume calculation techniques. The coordinate in the longitudinal direction is energy (E- Emean, energy with respect to mean energy) of each muon (momentum coordinates used in computing the energy are px/pmean, py/pmean, pz/pmean). Longitudinal heating (the expected effect from reverse emittance exchange) is demonstrated as the decrease in density at low average beam radius values._
!density_vs_volume_mc_recon_trans_1.png! attachment:density_vs_volume_mc_recon_trans_1.png
!density_vs_volume_mc_recon_trans_2.png! attachment:density_vs_volume_mc_recon_trans_2.png
!density_vs_volume_mc_recon_trans_3.png! attachment:density_vs_volume_mc_recon_trans_3.png
_The distribution of density of each phase-space contour, as measured with the kernel density estimation technique vs the fourth-root of contour volume (average beam radius in the four-dimensional transverse direction), as measured with the kernel density estimation and the Monte Carlo volume calculation techniques. The coordinates are the transverse coordinates x, px/pmean, y, py/pmean of each muon. Transverse cooling (the expected effect from reverse emittance exchange) is demonstrated as the increase in density at low average beam radius values._
----
!us_e.png! attachment:us_e.png
!ds_e.png! attachment:ds_e.png
_The energy (E - Emean) distributions upstream (top) and downstream (bottom) of the wedge. wegde. The energy coordinate is the same as the one used in generating the longitudinal density-vs-volume plots above_
----
_Following a discussion, it was recommended not to scale the momentum coordinates to the total energy and to avoid subtracting by the average energy. The energy distribution and the new density vs volume plots are produced based on a direct evaluation of the KDE over the momentum coordinates, px, py, and pz (without scaling to total momentum) ad the energy coordinate is no longer E - <E> and is directly E of each muon:_