Cosmological Matter-Antimatter Asymmetry and Neutrino Oscillations
MICE hydrogen review Introduction to MICE. After the LHC… Many open questions in physics: Gravity...
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Transcript of MICE hydrogen review Introduction to MICE. After the LHC… Many open questions in physics: Gravity...
![Page 1: MICE hydrogen review Introduction to MICE. After the LHC… Many open questions in physics: Gravity & standard model Matter-antimatter imbalance Dark matter.](https://reader036.fdocuments.us/reader036/viewer/2022062401/5a4d1b0f7f8b9ab05998da70/html5/thumbnails/1.jpg)
MICE hydrogen review
Introduction to MICE
![Page 2: MICE hydrogen review Introduction to MICE. After the LHC… Many open questions in physics: Gravity & standard model Matter-antimatter imbalance Dark matter.](https://reader036.fdocuments.us/reader036/viewer/2022062401/5a4d1b0f7f8b9ab05998da70/html5/thumbnails/2.jpg)
After the LHC…
Many open questions in physics:• Gravity & standard model• Matter-antimatter imbalance• Dark matter
Higher energy collisions = MUON COLLIDERNeutrino physics = NEUTRINO FACTORY
MICE is an essential proof-of-concept for both
![Page 3: MICE hydrogen review Introduction to MICE. After the LHC… Many open questions in physics: Gravity & standard model Matter-antimatter imbalance Dark matter.](https://reader036.fdocuments.us/reader036/viewer/2022062401/5a4d1b0f7f8b9ab05998da70/html5/thumbnails/3.jpg)
Muon Ionization Cooling Experiment
• MC & NF need collimated muon beam
• Pion decay produces muon beam with high ‘emmitance’
• Traditional ‘cooling’ techniques are too slow...
• MICE uses ionization of an absorber material to reduce momentum in all directions
• Beam then reaccelerated in z-direction only
![Page 4: MICE hydrogen review Introduction to MICE. After the LHC… Many open questions in physics: Gravity & standard model Matter-antimatter imbalance Dark matter.](https://reader036.fdocuments.us/reader036/viewer/2022062401/5a4d1b0f7f8b9ab05998da70/html5/thumbnails/4.jpg)
π – μ – ν?
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Linear accelerator
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π
H- ion Al2O3 foil
Synchrotron accelerator
ProtonTi
target
Pion
Dipole
Decay solenoid
μ
MICEν
MuonNeutrino
ν -
![Page 5: MICE hydrogen review Introduction to MICE. After the LHC… Many open questions in physics: Gravity & standard model Matter-antimatter imbalance Dark matter.](https://reader036.fdocuments.us/reader036/viewer/2022062401/5a4d1b0f7f8b9ab05998da70/html5/thumbnails/5.jpg)
The MICE beamline
Measure Cool Accelerate Cool Accelerate Cool Measure
Absorber focus coil
Spectrometer solenoid
Radio frequency coupling coil
![Page 6: MICE hydrogen review Introduction to MICE. After the LHC… Many open questions in physics: Gravity & standard model Matter-antimatter imbalance Dark matter.](https://reader036.fdocuments.us/reader036/viewer/2022062401/5a4d1b0f7f8b9ab05998da70/html5/thumbnails/6.jpg)
Why hydrogen?• Because physicists like to be difficult.• And, because it has the best ratio of ionisation
cooling to multiple scattering (or so they say)
• Lithium hydride and plastic will also be used
![Page 7: MICE hydrogen review Introduction to MICE. After the LHC… Many open questions in physics: Gravity & standard model Matter-antimatter imbalance Dark matter.](https://reader036.fdocuments.us/reader036/viewer/2022062401/5a4d1b0f7f8b9ab05998da70/html5/thumbnails/7.jpg)
Small problem number 1• We apparently forgot that iron becomes magnetic in a magnetic field…• All the services positioned ‘safely’ behind the shield walls became
suddenly not so safe!• Two options:
– Shield every sensitive component individually with mu-metal and iron– Build a retrospective return yoke
This has been plagued by: - Difficult integration engineering - Stubborn procurement departments - US/Japan cultural differences - Snow
But it’s now on its way!
![Page 8: MICE hydrogen review Introduction to MICE. After the LHC… Many open questions in physics: Gravity & standard model Matter-antimatter imbalance Dark matter.](https://reader036.fdocuments.us/reader036/viewer/2022062401/5a4d1b0f7f8b9ab05998da70/html5/thumbnails/8.jpg)
Small problem number 2• The US Muon Accelerator Program was cancelled and MICE was ordered
to undergo a managed ramp-down in DOE funding• Taking into account the outstanding US contribution and STFC’s remaining
commitment, MICE was re-configured to:
• Fortuitously, this is actually a good thing as it is now more relevant to future NF activities!