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Title: Final Muon Emittance Exchange in Vacuum for a Collider

Abstract

We outline a plan for final muon ionization cooling with quadrupole doublets focusing onto short absorbers followed by emittance exchange in vacuum to achieve the small transverse beam sizes needed by a muon collider. A flat muon beam with a series of quadrupole doublet half cells appears to provide the strong focusing required for final cooling. Each quadrupole doublet has a low β region occupied by a dense, low Z absorber. After final cooling, normalized xyz emittances of (0.071, 0.141, 2.4) mm-rad are exchanged into (0.025, 0.025, 70) mm-rad. Thin electrostatic septa efficiently slice the bunch into 17 parts. The 17 bunches are interleaved into a 3.7 meter long train with RF deflector cavities. Snap bunch coalescence combines the muon bunch train longitudinally in a 21 GeV ring in 55 μs, one quarter of a synchrotron oscillation period. A linear long wavelength RF bucket gives each bunch a different energy causing the bunches to drift until they merge into one bunch and can be captured in a short wavelength RF bucket with a 13% muon decay loss and a packing fraction as high as 87%.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Univ. of Mississippi, Oxford, MS (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1209534
Report Number(s):
FERMILAB-CONF-15-216-AD-APC
arXiv eprint number arXiv:1505.01832
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: 6th International Particle Accelerator Conference 2015. Richmond, Virginia, USA, 3-8 May 2015.
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Summers, Don, Acosta, John, Cremaldi, Lucien, Hart, Terry, Oliveros, Sandra, Perera, Lalith, Wu, Wanwei, and Neuffer, David. Final Muon Emittance Exchange in Vacuum for a Collider. United States: N. p., 2015. Web.
Summers, Don, Acosta, John, Cremaldi, Lucien, Hart, Terry, Oliveros, Sandra, Perera, Lalith, Wu, Wanwei, & Neuffer, David. Final Muon Emittance Exchange in Vacuum for a Collider. United States.
Summers, Don, Acosta, John, Cremaldi, Lucien, Hart, Terry, Oliveros, Sandra, Perera, Lalith, Wu, Wanwei, and Neuffer, David. Thu . "Final Muon Emittance Exchange in Vacuum for a Collider". United States. https://www.osti.gov/servlets/purl/1209534.
@article{osti_1209534,
title = {Final Muon Emittance Exchange in Vacuum for a Collider},
author = {Summers, Don and Acosta, John and Cremaldi, Lucien and Hart, Terry and Oliveros, Sandra and Perera, Lalith and Wu, Wanwei and Neuffer, David},
abstractNote = {We outline a plan for final muon ionization cooling with quadrupole doublets focusing onto short absorbers followed by emittance exchange in vacuum to achieve the small transverse beam sizes needed by a muon collider. A flat muon beam with a series of quadrupole doublet half cells appears to provide the strong focusing required for final cooling. Each quadrupole doublet has a low β region occupied by a dense, low Z absorber. After final cooling, normalized xyz emittances of (0.071, 0.141, 2.4) mm-rad are exchanged into (0.025, 0.025, 70) mm-rad. Thin electrostatic septa efficiently slice the bunch into 17 parts. The 17 bunches are interleaved into a 3.7 meter long train with RF deflector cavities. Snap bunch coalescence combines the muon bunch train longitudinally in a 21 GeV ring in 55 μs, one quarter of a synchrotron oscillation period. A linear long wavelength RF bucket gives each bunch a different energy causing the bunches to drift until they merge into one bunch and can be captured in a short wavelength RF bucket with a 13% muon decay loss and a packing fraction as high as 87%.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {5}
}

Conference:
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