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Title: Muon Beam Helical Cooling Channel Design

Abstract

The Helical Cooling Channel (HCC) achieves effective ionization cooling of the six-dimensional (6d) phase space of a muon beam by means of a series of 21st century inventions. In the HCC, hydrogen-pressurized RF cavities enable high RF gradients in strong external magnetic fields. The theory of the HCC, which requires a magnetic field with solenoid, helical dipole, and helical quadrupole components, demonstrates that dispersion in the gaseous hydrogen energy absorber provides effective emittance exchange to enable longitudinal ionization cooling. The 10-year development of a practical implementation of a muon-beam cooling device has involved a series of technical innovations and experiments that imply that an HCC of less than 300 m length can cool the 6d emittance of a muon beam by six orders of magnitude. We describe the design and construction plans for a prototype HCC module based on oxygen-doped hydrogen-pressurized RF cavities that are loaded with dielectric, fed by magnetrons, and operate in a superconducting helical solenoid magnet.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1137100
Report Number(s):
JLAB-ACC-13-1690; DOE/OR/23177-3135
U.S. DOE STTR Grant DE-SC0006266
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: COOL'13 , June 13-16, 2013, Mürren, Switzerland
Country of Publication:
United States
Language:
English

Citation Formats

Johnson, Rolland, Ankenbrandt, Charles, Flanagan, G, Kazakevich, G M, Marhauser, Frank, Neubauer, Michael, Roberts, T, Yoshikawa, C, Derbenev, Yaroslav, Morozov, Vasiliy, Kashikhin, V S, Lopes, Mattlock, Tollestrup, A, Yonehara, Katsuya, and Zloblin, A. Muon Beam Helical Cooling Channel Design. United States: N. p., 2013. Web.
Johnson, Rolland, Ankenbrandt, Charles, Flanagan, G, Kazakevich, G M, Marhauser, Frank, Neubauer, Michael, Roberts, T, Yoshikawa, C, Derbenev, Yaroslav, Morozov, Vasiliy, Kashikhin, V S, Lopes, Mattlock, Tollestrup, A, Yonehara, Katsuya, & Zloblin, A. Muon Beam Helical Cooling Channel Design. United States.
Johnson, Rolland, Ankenbrandt, Charles, Flanagan, G, Kazakevich, G M, Marhauser, Frank, Neubauer, Michael, Roberts, T, Yoshikawa, C, Derbenev, Yaroslav, Morozov, Vasiliy, Kashikhin, V S, Lopes, Mattlock, Tollestrup, A, Yonehara, Katsuya, and Zloblin, A. Sat . "Muon Beam Helical Cooling Channel Design". United States. doi:. https://www.osti.gov/servlets/purl/1137100.
@article{osti_1137100,
title = {Muon Beam Helical Cooling Channel Design},
author = {Johnson, Rolland and Ankenbrandt, Charles and Flanagan, G and Kazakevich, G M and Marhauser, Frank and Neubauer, Michael and Roberts, T and Yoshikawa, C and Derbenev, Yaroslav and Morozov, Vasiliy and Kashikhin, V S and Lopes, Mattlock and Tollestrup, A and Yonehara, Katsuya and Zloblin, A},
abstractNote = {The Helical Cooling Channel (HCC) achieves effective ionization cooling of the six-dimensional (6d) phase space of a muon beam by means of a series of 21st century inventions. In the HCC, hydrogen-pressurized RF cavities enable high RF gradients in strong external magnetic fields. The theory of the HCC, which requires a magnetic field with solenoid, helical dipole, and helical quadrupole components, demonstrates that dispersion in the gaseous hydrogen energy absorber provides effective emittance exchange to enable longitudinal ionization cooling. The 10-year development of a practical implementation of a muon-beam cooling device has involved a series of technical innovations and experiments that imply that an HCC of less than 300 m length can cool the 6d emittance of a muon beam by six orders of magnitude. We describe the design and construction plans for a prototype HCC module based on oxygen-doped hydrogen-pressurized RF cavities that are loaded with dielectric, fed by magnetrons, and operate in a superconducting helical solenoid magnet.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 2013},
month = {Sat Jun 01 00:00:00 EDT 2013}
}

Conference:
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  • The Helical Cooling Channel (HCC), a novel technique for six-dimensional (6D) ionization cooling of muon beams, has shown considerable promise based on analytic and simulation studies. However, the implementation of this revolutionary method of muon cooling requires new techniques for the integration of hydrogen-pressurized, high-power RF cavities into the low-temperature superconducting magnets of the HCC. We present the progress toward a conceptual design for the integration of 805 MHz RF cavities into a 10 T Nb{sub 3}Sn based HCC test section. We include discussions on the pressure and thermal barriers needed within the cryostat to maintain operation of the magnetmore » at 4.2 K while operating the RF and energy absorber at a higher temperature. Additionally, we include progress on the Nb{sub 3}Sn helical solenoid design.« 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
  • A helical cooling channel (HCC) can quickly reduce the six dimensional phase space of muon beams for muon colliders, neutrino factories, and intense muon sources. The HCC is composed of solenoidal, helical dipole, and helical quadrupole magnetic fields to provide the focusing and dispersion needed for emittance exchange as the beam follows an equilibrium helical orbit through a continuous homogeneous absorber. We consider liquid helium and liquid hydrogen absorbers in HCC segments that alternate with RF accelerating sections and we also consider gaseous hydrogen absorber in pressurized RF cavities imbedded in HCC segments. In the case of liquid absorber, themore » possibility of using superconducting RF in low magnetic field regions between the HCC segments may provide a cost effective solution to the high repetition rate needed for an intense neutrino factory or high average luminosity muon collider. In the gaseous hydrogen absorber case, the pressurized RF cavities can be operated at low temperature to improve their efficiency for higher repetition rates. Numerical simulations are used to optimize and compare the liquid and gaseous HCC techniques.« less
  • A helical cooling channel (HCC) can quickly reduce the six dimensional phase space of muon beams for muon colliders, neutrino factories, and intense muon sources. The HCC is composed of solenoidal, helical dipole, and helical quadrupole magnetic fields to provide the focusing and dispersion needed for emittance exchange as the beam follows an equilibrium helical orbit through a continuous homogeneous absorber. The beam dynamics of a gas-filled helical muon beam cooling channel is studied by using Monte Carlo simulations. The results verify the cooling theory [1] of the helical magnet. The cooling performance has been improved by correcting chromatic aberrationmore » and the non-linear effects caused by the ionization energy loss process. With these improvements, a simulated cooling channel of 160 meters length has achieved a reduction of 6-dimensional (6D) phase space by a factor of 50,000.« less