Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University...
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Transcript of Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University...
![Page 1: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/1.jpg)
http://www.nevis.columbia.edu/~galea/mucos
Low Energy Muon Cooling :Low Energy Muon Cooling : Frictional Cooling Frictional Cooling
Studies at Columbia University &Nevis LabsStudies at Columbia University &Nevis Labs
Raphael GaleaRaphael Galea
Allen CaldwellAllen Caldwell
Stefan Schlenstedt (DESY/Zeuten)Stefan Schlenstedt (DESY/Zeuten)
Halina Abramowitz(Tel Aviv University)Halina Abramowitz(Tel Aviv University)
Summer Students: Summer Students: Christos Georgiou Christos Georgiou Daniel GreenwaldDaniel GreenwaldYujin NingYujin NingInna ShpiroInna ShpiroWill SerberWill Serber
![Page 2: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/2.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
MUon COoling StudiesMUon COoling Studies
• Introduction– Target Optimization– Problem of Multiple Scattering at low energies
• Test Lab at Nevis– Experiment at PSI– Plans for the future
![Page 3: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/3.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
Frictional CoolingFrictional 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
![Page 4: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/4.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
Problems/Comments: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=1s so a scheme for reacceleration must be developed
BE
![Page 5: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/5.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
Basic DesignBasic Design
![Page 6: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/6.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
Muon Motion in Cooling CellMuon Motion in Cooling Cell
![Page 7: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/7.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
Target OptimizationTarget Optimization
• Want low energy muons hence need to optimize pion production accordingly for:– Proton Driver Energy
– Target Material
– Target Dimensions
– Target Orientation
PeripheralPeripheral CentralCentral
![Page 8: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/8.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
Magnet CaptureMagnet Capture
PeripheralPeripheral CentralCentral
• +ve & -ve in same channel+ve & -ve in same channel •Separate charges at sourceSeparate charges at source
pp
pp
![Page 9: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/9.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
Phase RotationPhase Rotation
• Apply simple E-field form :
• Optimize muon yield as a function of t1,t2 & Length of the phase rotation region t1t1 t2t2
EmaxEmax
![Page 10: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/10.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
![Page 11: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/11.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
Multiple ScatteringMultiple 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
![Page 12: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/12.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
PSI ExperimentPSI Experiment
• Experiment study Lamb Shift in Muonic Atoms
• Muon Spectrum 10-40KeV
• 5T Magnet with D=20cm bore
![Page 13: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/13.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
Nevis SetupNevis Setup
![Page 14: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/14.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
Simulation @ NevisSimulation @ 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
![Page 15: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/15.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
![Page 16: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/16.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
![Page 17: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/17.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
Goals of ExperimentGoals 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
![Page 18: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/18.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
Nevis lab:Nevis lab:
• Multipurpose Vacuum Chamber
• Fast Logic Readout• MCP Detector• X-ray MWPC
development underway
![Page 19: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/19.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
MWPC X-ray Detector
• 4 channel prototype• Possible extension to
tracker – track decay e- from captured -
![Page 20: Http://galea/mucos Low Energy Muon Cooling : Frictional Cooling Studies at Columbia University &Nevis Labs Raphael Galea Allen.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d6d5503460f94a4d701/html5/thumbnails/20.jpg)
Emittance Exchange WorkshopLBL: Oct 3-16, 2001
Columbia University/Nevis LabsRaphael Galea
http://www.nevis.columbia.edu/~galea/mucos
SummarySummary
• 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