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Title: A COMPLETE SCHEME FOR IONIZATION COOLING FOR A MUON COLLIDER.

Abstract

A complete scheme for production and cooling a muon beam for three specified muon colliders is presented. Parameters for these muon colliders are given. The scheme starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Emittance exchange cooling in slow helical lattices reduces the longitudinal emittance until it becomes possible to merge the trains into single bunches, one of each sign. Further cooling in all dimensions is applied to the single bunches in further slow helical lattices. Final transverse cooling to the required parameters is achieved in 50 T solenoids using high TC superconductor at 4 K. Preliminary simulations of each element are presented.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
910370
Report Number(s):
BNL-78088-2007-CP
R&D Project: 08778; KA1502030; TRN: US0704169
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: PARTICLE ACCELERATOR CONFERENCE 2007; ALBUQUERQUE, NEW MEXICO; 20070625 through 20070629
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; DIMENSIONS; IONIZATION; MUON BEAMS; MUONS; NEUTRINOS; PRODUCTION; SOLENOIDS; SUPERCONDUCTORS

Citation Formats

PALMER,R.B., BERG, J.S., FERNOW, R.C., GALLARDO, J.C., KIRK, H.G., ALEXAHIN, Y., NEUFFER, D., KAHN, S.A., and SUMMERS, D. A COMPLETE SCHEME FOR IONIZATION COOLING FOR A MUON COLLIDER.. United States: N. p., 2007. Web.
PALMER,R.B., BERG, J.S., FERNOW, R.C., GALLARDO, J.C., KIRK, H.G., ALEXAHIN, Y., NEUFFER, D., KAHN, S.A., & SUMMERS, D. A COMPLETE SCHEME FOR IONIZATION COOLING FOR A MUON COLLIDER.. United States.
PALMER,R.B., BERG, J.S., FERNOW, R.C., GALLARDO, J.C., KIRK, H.G., ALEXAHIN, Y., NEUFFER, D., KAHN, S.A., and SUMMERS, D. Mon . "A COMPLETE SCHEME FOR IONIZATION COOLING FOR A MUON COLLIDER.". United States. doi:. https://www.osti.gov/servlets/purl/910370.
@article{osti_910370,
title = {A COMPLETE SCHEME FOR IONIZATION COOLING FOR A MUON COLLIDER.},
author = {PALMER,R.B. and BERG, J.S. and FERNOW, R.C. and GALLARDO, J.C. and KIRK, H.G. and ALEXAHIN, Y. and NEUFFER, D. and KAHN, S.A. and SUMMERS, D.},
abstractNote = {A complete scheme for production and cooling a muon beam for three specified muon colliders is presented. Parameters for these muon colliders are given. The scheme starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Emittance exchange cooling in slow helical lattices reduces the longitudinal emittance until it becomes possible to merge the trains into single bunches, one of each sign. Further cooling in all dimensions is applied to the single bunches in further slow helical lattices. Final transverse cooling to the required parameters is achieved in 50 T solenoids using high TC superconductor at 4 K. Preliminary simulations of each element are presented.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jun 25 00:00:00 EDT 2007},
month = {Mon Jun 25 00:00:00 EDT 2007}
}

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  • The conclusions of this report are: (1) New 1.5 TeV Collider lattice has more conservative IP parameters--(a) Luminosity 1 x 10{sup 34} achieved with bunch rep rate {approx}12 Hz but requires depth {approx}135 (m) to limit neutrino radiation, (b) Collider ring must be deep (eg 135 m of ILC) to control neutrino radiation, and (c) Proton driver ({approx}4 MW) is challenging; (2) Complete cooling scheme achieves required muon parameters--All components simulated (at some level) with realistic parameters, but much work remains; (3) Possible problem with rf breakdown in specified magnetic fields--Solutions with gas in cavities appear to work, and designsmore » with open cell rf are promising; and (4) Lower cost acceleration possible using pulsed magnets in synchrotrons--Rings fit in Tevatron tunnel, and second ring uses hybrid of fixed and pulsed magnets.« less
  • A complete scheme for production, cooling, acceleration, and ring for a 1.5 TeV center of mass muon collider is presented, together with parameters for two higher energy machines. The schemes starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Six dimensional cooling in long-period helical lattices reduces the longitudinal emittance until it becomes possible to merge the trains into single bunches, one of each sign. Further cooling in all dimensions is applied to the single bunches in further helical lattices. Final transverse cooling to the required parameters is achieved in 50more » T solenoids.« less
  • Muon Dynamics and beam cooling methods for muon colliders are presented. Formulations and effects of Ionization cooling as the preferred method used to compress the phase space to reduce the emittance and to obtain high luminosity muon beams are also included.
  • Two methods to cool muon beams deeply below the limit conventionally established for the ionization cooling are proposed. In Phase Ionization Cooling (PIC), the beam is focused at wedge absorber plates each half of particle oscillation period by imposing a weak parametric resonance along the beam path. The resonance growth of particle amplitude is surmounted by the ionization cooling. At optimum, such arrangement results in reduction of each of two transverse emittances by an order of value in addition to the preceding 6D ionization cooling. Next, resonance focusing and transverse cooling can be continued in the regime of a fastmore » Reverse Emittance Exchange (REMEX). Here, the sign of the absorber wedge is opposite to PIC while the dispersion increased. REMEX to be accompanied by the bunch lengthening and acceleration in order to maintain the relative energy spread at an appropriate level. The limitations due to energy straggling in absorber will be evaluated, and possibilities of beam conditioning against aberrations and muon space charge will be illustrated for specific beam transports. Estimates of Muon Collider luminosity versus muon production rate will be presented.« less