Magnets for the MANX 6-D muon cooling demonstration experiment

Kashikhin, V.V.; Kashikhin, V.S.; Lamm, M.J.; Romanov, Gennady; Yonehara, K.; Zlobin, A.V.; Johnson, R.P.; Kahn, S.; Roberts, Thomas J.

doi:10.1109/pac.2007.4440245

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…1 the large-bore solenoid with added helical coils, the HS has half the coil diameter, a quarter of the superconductor volume, seven times lower total magnetic field energy, lower peak field in the superconductor (5.7 T vs. 7.6 T), correspondingly lower Lorentz forces, and naturally generated helical dipole and quadrupole fields. This more efficient HS concept was chosen for further investigation and has been discussed briefly [4], [5]. This paper summarizes further investigations of the HCC for muon beam cooling.…”

Section: Superconducting Helical Solenoids For Muon Beam Cooling I Imentioning

confidence: 99%

Superconducting Helical Solenoids for Muon Beam Cooling

Kashikhin

Andreev

Jansson

et al. 2008

IEEE Trans. Appl. Supercond.

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Novel configurations of superconducting magnets for helical muon beam cooling channels and demonstration experiments are being designed at Fermilab. The magnet system for helical cooling channels has to generate longitudinal solenoidal and transverse helical dipole and helical quadrupole fields. It was found that this complicated field configuration can be made by a helical solenoid, which is a set of circular coils shifted in transverse directions in such a way that their centers lay on the center of the helical beam orbit. This paper discusses the possibility of combining two such channels in one mechanical structure to allow beams of positive and negative muons to be cooled at the same time. The status of a short model helical solenoid prototype to study its magnetic and mechanical properties is also described.Index Terms-Helical solenoid, magnetic design, muon cooling, superconducting magnet system.

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Section: Superconducting Helical Solenoids For Muon Beam Cooling I Imentioning

confidence: 99%

Superconducting Helical Solenoids for Muon Beam Cooling

Kashikhin

Andreev

Jansson

et al. 2008

IEEE Trans. Appl. Supercond.

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“…One version of the HCC uses a series of high-gradient RF cavities filled with dense hydrogen gas, where the cavities are in a magnetic channel composed of a solenoidal field with superimposed helical transverse dipole and quadrupole fields [23,24]. In this scheme, energy loss, RF energy regeneration, emittance exchange, and longitudinal and transverse cooling happen simultaneously.…”

Section: Gas-filled Helical Cooling Channel (Hcc)mentioning

confidence: 99%

Ionization Cooling using Parametric Resonances

Derbenev

Johnson²

2008

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(Dr. Yaroslav Derbenev, Subcontract PI). The project was to develop the theory and simulations of Parametric-resonance Ionization Cooling (PIC) so that it could be used to provide the extra transverse cooling needed for muon colliders in order to relax the requirements on the proton driver, reduce the site boundary radiation, and provide a better environment for experiments.During the course of the project, the theoretical understanding of PIC was developed [1,2] and a final exposition is ready for publication [Appendix I]. Workshops were sponsored by Muons, Inc. in May and September of 2007 that were devoted to the PIC technique [3]. One outcome of the workshops was the interesting and somewhat unexpected realization that the beam emittances using the PIC technique can get small enough that space charge forces can be important. A parallel effort to develop our G4beamline simulation program to include space charge effects was initiated to address this problem [4]. A method of compensating for chromatic aberrations by employing synchrotron motion was developed and simulated [5 and Appendix II]. A method of compensating for spherical aberrations using beamline symmetry was also developed and simulated [6 and Appendix III]. Different optics designs have been developed [7] using the OptiM program in preparation for applying our G4beamline simulation program, which contains all the power of the Geant4 toolkit.However, no PIC channel design that has been developed has had the desired cooling performance when subjected to the complete G4beamline simulation program. This is believed to be the consequence of the difficulties of correcting the aberrations associated with the naturally large beam angles and beam sizes of the PIC method that are exacerbated by the fringe fields of the rather complicated channel designs that have been attempted. That is, while the designs developed and tested using the matrix program OptiM can work well, a real simulation with lumped dipoles, quadrupoles, and solenoids and their associated fringe fields has not succeeded. As a consequence of this realization, a new approach is being attempted that is based on the use of a helical solenoid (HS) channel that is made of simple coils that provide a much more homogeneous magnetic field. However, in order to use the HS a new approach was required to generate a variable dispersion that is needed according to the PIC theory described above. This approach and its first implementation will be described at EPAC08 in June, 2008 [8].In the sections of the report that follow, the general theory of muon beam cooling is described starting from the basic ideas of ionization cooling and ending with the PIC ideas that have been developed in this project. The detailed theory of PIC is presented in Appendix I. The most important papers of the project are presented in subsequent appendices. Discussion of Accomplishments:A preprint of the PRSTAB paper covering PIC theory is shown as Appendix I below. The aberration correction discussion is much more complet...

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“…The HCC is an attractive example of a cooling channel based on this idea of energy loss dependence on path length in a continuous absorber. One version of the HCC uses a series of high-gradient RF cavities filled with dense hydrogen gas, where the cavities are in a magnetic channel composed of a solenoid field with superimposed helical transverse dipole and quadrupole fields [15,16]. In this scheme, energy loss, RF energy regeneration, emittance exchange, and longitudinal and transverse cooling happen simultaneously.…”

Section: Gas-filled Helical Cooling Channel (Hcc)mentioning

confidence: 99%

Final Technical Report on STTR Project DE-FG02-04ER86191 Hydrogen Cryostat for Muon Beam Cooling

Johnson¹

2008

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Subcontract PI) to extend the use of hydrogen in ionization cooling to that of refrigerant in addition to breakdown suppressant and energy absorber. The project was to develop cryostat designs that could be used for muon beam cooling channels where hydrogen would circulate through refrigerators and the beam-cooling channel to simultaneously refrigerate 1) high-temperature-superconductor (HTS) magnet coils, 2) cold copper RF cavities, and 3) the hydrogen that is heated by the muon beam. In an application where a large amount of hydrogen is naturally present because it is the optimum ionization cooling material, it was reasonable to explore its use with HTS magnets and cold, but not superconducting, RF cavities. In this project we developed computer programs for simulations and analysis and conducted experimental programs to examine the parameters and technological limitations of the materials and designs of Helical Cooling Channel (HCC) components (magnet conductor, RF cavities, absorber windows, heat transport, energy absorber, and refrigerant).

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Magnets for the MANX 6-D muon cooling demonstration experiment

Cited by 9 publications

References 6 publications

Superconducting Helical Solenoids for Muon Beam Cooling

Superconducting Helical Solenoids for Muon Beam Cooling

Ionization Cooling using Parametric Resonances

Final Technical Report on STTR Project DE-FG02-04ER86191 Hydrogen Cryostat for Muon Beam Cooling

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