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Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.

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Presentation on theme: "Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen."— Presentation transcript:

1 http://www.nevis.columbia.edu/~galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen Caldwell Stefan Schlenstedt (DESY/Zeuten) Halina Abramowitz(Tel Aviv University) Summer Students: Christos Georgiou Daniel Greenwald Yujin Ning Inna Shpiro Will Serber

2 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea MUon COoling Studies Introduction –Target Optimization –Problem of Multiple Scattering at low energies Test Lab at Nevis –Experiment at PSI –Plans for the future

3 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Frictional Cooling Bring muons to a kinetic energy (T) range where dE/dx increases with T Constant E-field applied to muons resulting in equilibrium energy

4 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Problems/Comments: large dE/dx @ low kinetic energy low average density Apply to get below the dE/dx peak  has the problem of Muonium formation  dominates over e-stripping  in all gases except He  has the problem of Atomic capture  calculated up to 80 eV not measured below ~1KeV Cool  ’s extracted from gas cell T=1  s so a scheme for reacceleration must be developed

5 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Basic Design

6 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Muon Motion in Cooling Cell

7 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Target Optimization Want low energy muons hence need to optimize pion production accordingly for: –Proton Driver Energy –Target Material –Target Dimensions –Target Orientation PeripheralCentral

8 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Magnet Capture PeripheralCentral    +ve & -ve in same channel +ve & -ve in same channel Separate charges at sourceSeparate charges at source p p

9 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Phase Rotation Apply simple E-field form : Optimize muon yield as a function of t1,t2 & Length of the phase rotation region t1t2 Emax

10 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea

11 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Multiple Scattering To date simulations only considered continuous dE/dx May turn out that component of E-field parallel to B-field needed Technically difficult because of large angle scatters at low energies

12 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea PSI Experiment Experiment study Lamb Shift in Muonic Atoms Muon Spectrum 10-40KeV 5T Magnet with D=20cm bore

13 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Nevis Setup

14 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Simulation @ Nevis Vary E-field, density & length of gas cell Simulation with no Multiple Scattering E-field parallel to B- field so muons do not stop

15 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea

16 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea

17 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Goals of Experiment Measure X-ray released from capture in Gas Atom Check understanding of energy loss, multiple scattering Measure  - capture cross section at low energies in He & H2

18 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Nevis lab: Multipurpose Vacuum Chamber Fast Logic Readout MCP Detector X-ray MWPC development underway

19 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea MWPC X-ray Detector 4 channel prototype Possible extension to tracker – track decay e- from captured  -

20 http://www.nevis.columbia.edu/~galea/mucos Emittance Exchange Workshop LBL: Oct 3-16, 2001 Columbia University/Nevis Labs Raphael Galea Summary Exciting alternative concept for muon cooling Possibility to cool both signs at once Experiment to measure  - capture cross section planned…..STAY TUNED Different Simulations/Optimizations will be integrated in GEANT4.3

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