|Event & Minutes|
1. Where do we go?
2. How can we reach the goal?
The ultimate goal is a large muon collider (LMC) in the TeV range. In order to assess its feasibility and to produce first class physics before LMC completion, it is proposed to investigate two other applications of cold muon beams: a muon storage ring as a source of neutrinos which could be operated within six years and, later on, after LHC and NLC first discoveries, a precision muon collider (PMC) that could operate as a Higgs factory or at top threshold.
Integrated resources in arbitrary units versus time (GIF file)
Integrated resources in arbitrary units versus time (EPS file)
The comparison of the machine parameters shows that, indeed, a progressive implementation of the various components can lead to the LMC with intermediate stages adapted to up to date physics experiments.
|particle||p (heavy ion? e? ...)||id.||id.|
|f [Hz]||available||> 15||15|
|n||available||5 1013||2.5 1013|
|Target & capture|
|particle||m+||m+, m-||m+, m-|
|material||C||Pb, Ga alloys||Pb, Ga alloys|
|Dr-Dq [mm .mrad]||~ 15000||id.||id.|
|DE-Dt [eV.s]||~ 1 - 6||id.||id.|
|(et/et0)2||7 10-2||~ 10-4||~ 10-4|
|el/el0||1||~ 2.5 10-2||~ 2.5 10-2|
|DE [GeV]||10 - 20||2*(50 - 200)||2*1500|
|b*-value [m]||~ 100||0.026||0.003|
|Dp/p [%]||~ +_10||0.003 - 0.14||0.16|
|Flux [n-nbar/s]||4 - 120 1012||-||-|
|Luminosity [cm-2s-1]||-||1031 - 1032||7 1034|
1. Choose neutrinos
2. Select the best system: proton driver & target.
3. Evaluate the minimum interesting flux and decide
a. which capture system to build,
b. whether cooling is necessary and, if so, the number of transverse cooling stages.
4. Build accelerator and storage ring.
5. Start first physics experiments.
Neutrino source (GIF file)
Neutrino source (EPS file)
6. Upgrade capture and cooling by adding more stages for transverse and momentum cooling.
7. Build a collider oriented proton driver and target system.
8. Build acceleration system for PMC.
9. Build PMC.
10. Build acceleration system for LMC.
11. Build LMC.
The various areas where the participants to this study can contribute are listed in the table here below. In the beam-matter column are regrouped both particle interaction and technological aspects.
|Beam - matter||Optics||Acceleration|
|Rapid cycling synchrotrons||RF cavities (JHF type)|
|Target & capture|
|Particle yield||Solenoid||Bunch rotator|
|Radiation problems||Lithium lens|
|Absorbers||Low b lattice||SC cavities|
|Cooling and heating processes||Orbit dispersion|
|Solenoids and Lithium lenses|
|Dipoles and quadrupoles|
|SC magnets||Compact isochronous lattice||Short bunch|
|Background||Very low b*||Instabilities|
|v radiation||Very low Dp/p||RF quadrupoles|
|Optical stochastic cooling||Polarization|
|Beam-beam passivation||SC dipoles and quadrupoles|
It may turn out that the project is too ambitious and that one cannot build a muon collider. However, the R&D investment will not be lost because it can serve other applications.
Japan Hadron Facility type of research.
Rich physics program (next speakers).
m catalyzed fusion?
Escape space charge problems in high intensity machines.
Very low b* insertions are mandatory for any collider.
High field dipoles and quadrupoles have also to be developed for a super-LHC.