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Title: Recent Innovations in Muon Beam Cooling

Abstract

Eight new ideas are being developed under SBIR/STTR grants to cool muon beams for colliders, neutrino factories, and muon experiments. Analytical and simulation studies have confirmed that a six-dimensional (6D) cooling channel based on helical magnets surrounding RF cavities filled with dense hydrogen gas can provide effective beam cooling. This helical cooling channel (HCC) has solenoidal, helical dipole, helical quadrupole, and helical sextupole magnetic fields to generate emittance exchange and achieve 6D emittance reduction of over 3 orders of magnitude in a 100 m segment. Four such sequential HCC segments, where the RF frequencies are increased and transverse physical dimensions reduced as the beams become cooler, implies a 6D emittance reduction of almost five orders of magnitude. Two new cooling ideas, Parametric-resonance Ionization Cooling and Reverse Emittance Exchange, then can be employed to reduce transverse emittances to a few mm-mr, which allows high luminosity with fewer muons than previously imagined. We describe these new ideas as well as a new precooling idea based on a HCC with z dependent fields that can be used as MANX, an exceptional 6D cooling demonstration experiment.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
883803
Report Number(s):
JLAB-ACP-05-389; DOE/ER/40150-3938
TRN: US200615%%258
DOE Contract Number:
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: International Workshop on Beam Cooling and Related Topics (COOL05), Eagle Ridge, Galena, Illinois, 18 - 23 Sep 200
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; BEAM COOLING; CAVITIES; DIMENSIONS; HYDROGEN; IONIZATION; LUMINOSITY; MAGNETIC FIELDS; MAGNETS; MUON BEAMS; MUONS; NEUTRINOS; SIMULATION

Citation Formats

Rolland P. Johnson, Mohammad Alsharo'a, Charles Ankenbrandt, Emanuela Barzi, Kevin Beard, S. Alex Bogacz, Yaroslav Derbenev, Licia Del Frate, Ivan Gonin, Pierrick M. Hanlet, Robert Hartline, Daniel M. Kaplan, Moyses Kuchnir, Alfred Moretti, David Neuffer, Kevin Paul, Milorad Popovic, Thomas J. Roberts, Gennady Romanov, Daniele Turrioni, Victor Yarba, and and Katsuya Yonehara. Recent Innovations in Muon Beam Cooling. United States: N. p., 2006. Web.
Rolland P. Johnson, Mohammad Alsharo'a, Charles Ankenbrandt, Emanuela Barzi, Kevin Beard, S. Alex Bogacz, Yaroslav Derbenev, Licia Del Frate, Ivan Gonin, Pierrick M. Hanlet, Robert Hartline, Daniel M. Kaplan, Moyses Kuchnir, Alfred Moretti, David Neuffer, Kevin Paul, Milorad Popovic, Thomas J. Roberts, Gennady Romanov, Daniele Turrioni, Victor Yarba, & and Katsuya Yonehara. Recent Innovations in Muon Beam Cooling. United States.
Rolland P. Johnson, Mohammad Alsharo'a, Charles Ankenbrandt, Emanuela Barzi, Kevin Beard, S. Alex Bogacz, Yaroslav Derbenev, Licia Del Frate, Ivan Gonin, Pierrick M. Hanlet, Robert Hartline, Daniel M. Kaplan, Moyses Kuchnir, Alfred Moretti, David Neuffer, Kevin Paul, Milorad Popovic, Thomas J. Roberts, Gennady Romanov, Daniele Turrioni, Victor Yarba, and and Katsuya Yonehara. Wed . "Recent Innovations in Muon Beam Cooling". United States. doi:. https://www.osti.gov/servlets/purl/883803.
@article{osti_883803,
title = {Recent Innovations in Muon Beam Cooling},
author = {Rolland P. Johnson and Mohammad Alsharo'a and Charles Ankenbrandt and Emanuela Barzi and Kevin Beard and S. Alex Bogacz and Yaroslav Derbenev and Licia Del Frate and Ivan Gonin and Pierrick M. Hanlet and Robert Hartline and Daniel M. Kaplan and Moyses Kuchnir and Alfred Moretti and David Neuffer and Kevin Paul and Milorad Popovic and Thomas J. Roberts and Gennady Romanov and Daniele Turrioni and Victor Yarba and and Katsuya Yonehara},
abstractNote = {Eight new ideas are being developed under SBIR/STTR grants to cool muon beams for colliders, neutrino factories, and muon experiments. Analytical and simulation studies have confirmed that a six-dimensional (6D) cooling channel based on helical magnets surrounding RF cavities filled with dense hydrogen gas can provide effective beam cooling. This helical cooling channel (HCC) has solenoidal, helical dipole, helical quadrupole, and helical sextupole magnetic fields to generate emittance exchange and achieve 6D emittance reduction of over 3 orders of magnitude in a 100 m segment. Four such sequential HCC segments, where the RF frequencies are increased and transverse physical dimensions reduced as the beams become cooler, implies a 6D emittance reduction of almost five orders of magnitude. Two new cooling ideas, Parametric-resonance Ionization Cooling and Reverse Emittance Exchange, then can be employed to reduce transverse emittances to a few mm-mr, which allows high luminosity with fewer muons than previously imagined. We describe these new ideas as well as a new precooling idea based on a HCC with z dependent fields that can be used as MANX, an exceptional 6D cooling demonstration experiment.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2006},
month = {Wed Mar 01 00:00:00 EST 2006}
}

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  • A six-dimensional(6D)cooling channel based on helical magnets surrounding RF cavities filled with dense hydrogen gas* is used to achieve the small transverse emittances demanded by a high-luminosity muon collider. This helical cooling channel**(HCC) has solenoidal, helical dipole, and helical quadrupole magnetic fields to generate emittance exchange. Simulations verify the analytic predictions and have shown a 6D emittance reduction of over 3 orders of magnitude in a 100 m HCC segment. Using three such sequential HCC segments, where the RF frequencies are increased and transverse dimensions reduced as the beams become cooler, implies a 6D emittance reduction of almost six ordersmore » of magnitude. After this, two new post-cooling ideas can be employed to reduce transverse emittances to one or two mm-mr, which allows high luminosity with fewer muons than previously imagined. In this report we discuss the status of and the plans for the HCC simulation and engineering efforts. We also describe the new post-cooling ideas and comment on the prospects for a Higgs factory or energy frontier muon collider using existing laboratory infrastructure.« less
  • Eight new ideas are being developed under SBIR/STTR grants to cool muon beams for colliders, neutrino factories, and muon experiments. Analytical and simulation studies have confirmed that a six-dimensional (6D) cooling channel based on helical magnets surrounding RF cavities filled with dense hydrogen gas can provide effective beam cooling. This helical cooling channel (HCC) has solenoidal, helical dipole, helical quadrupole, and helical sextupole magnetic fields to generate emittance exchange and achieve 6D emittance reduction of over 3 orders of magnitude in a 100 m segment. Four such sequential HCC segments, where the RF frequencies are increased and transverse physical dimensionsmore » reduced as the beams become cooler, implies a 6D emittance reduction of almost five orders of magnitude. Two new cooling ideas, Parametric-resonance Ionization Cooling and Reverse Emittance Exchange, then can be employed to reduce transverse emittances to a few mm-mr, which allows high luminosity with fewer muons than previously imagined. We describe these new ideas as well as a new precooling idea based on a HCC with z dependent fields that can be used as MANX, an exceptional 6D cooling demonstration experiment.« less
  • Ionization cooling is an essential component of a neutrino factory or a muon collider. Ionization cooling in the transverse dimensions is reasonably straightforward, and has been incorporated in published neutrino factory studies. Achieving cooling in the longitudinal dimensions is more difficult, but has the potential to greatly improve the performance of neutrino factories, and is essential to muon colliders. Much progress has recently been made in describing ring cooling lattices which achieve cooling in all three phase space planes, and in the design of the required, but difficult, injection systems. Ring cooling lattices also have the potential of significantly reducedmore » cost compared to single-pass cooling systems with comparable performance. We will present some recent lattice designs, describing their theory, features, and performance, including injection and extraction systems.« less
  • The fast reduction of the six-dimensional phase space of muon beams is an essential requirement for muon colliders and also of great importance for neutrino factories based on accelerated muon beams. Considered cooling scheme involves the use of a continuous gaseous hydrogen absorber and a magnetic channel composed of a solenoidal field with superimposed helical transverse dipole and quadrupole fields. All momentum components of muons passing through the channel are degraded by an energy absorbing material and only the longitudinal momentum is restored by RF cavities, which yields a quick reduction of transverse beam sizes. In such a channel highermore » momentum muons cover longer path length and therefore experience larger ionization energy loss, which provides the desired emittance exchange mechanism. Recent theoretical work predicts exceptional six dimensional cooling in such a channel filled with a continuous hydrogen gas absorber [1]. Here we study the same channel, but without RF r e-acceleration, as the first stage of a muon cooling channel. The theory of this use of the helical channel is extended from the earlier work. Results from simulations based on the Geant4 program are compared to theoretical predictions.« less
  • A helical cooling channel (HCC) has been proposed to quickly reduce the six-dimensional phase space of muon beams for muon colliders, neutrino factories, and intense muon sources. The HCC is composed of a series of RF cavities filled with dense hydrogen gas that acts as the energy absorber for ionization cooling and suppresses RF breakdown in the cavities. Magnetic solenoidal, helical dipole, and helical quadrupole coils outside of the RF cavities provide the focusing and dispersion needed for the emittance exchange for the beam as it follows a helical equilibrium orbit down the HCC. In the work presented here, twomore » Monte Carlo programs have been developed to simulate a HCC to compare with the analytic predictions and to begin the process of optimizing practical designs that could be built in the near future. We discuss the programs, the comparisons with the analytical theory, and the prospects for a HCC design with the capability to reduce the six-dimensional phase space emittance of a muon beam by a factor of over five orders of magnitude in a linear channel less than 100 meters long.« less