Modification to Various Projects in Raithel

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Modification to Various Projects in Raithels
LabLouise Niu, University of Michigan REU
2008Advisor Georg Raithel

• http//cold-atoms.physics.lsa.umich.edu

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Outline
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Laser Cooling

• Rb Atoms absorb photons in the laser beam
• Conservation of Momentum
• Atom slows down
• Atom spits photons in a random direction
• Continuous photon stream from one direction

One dimensional laser cooling Animation
Atom
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Magneto-Optical Trap (MOT)

• 3 orthogonal pairs of counter-propagating laser
  beams.
• Quadruple magnetic field trap atoms in the
  center.
• Cool Rb Atoms to 1mK. (MOT)

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Building Compensating Magnetic Coils

• Motivation
• Create bias magnetic field to adjust MOT postion
  for Cryo-MOT
• Design Setup
• 3-dimentional Anti-Helmholtz magnetic field
• Each pair coils generates 2 gauss magnetic field
  in its center
• Vertical direction wrap coils on the chamber
• Horizontal plane coil formcardboard

Made by Louise !! lol
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Building Compensating Magnetic Coils

• MATLAB Simulation

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Building Compensating Magnetic Coils

• 1. Coil Wrapping

2. Mount Coils
3.Connect to Power Supply
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Testing
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Building Compensating Magnetic Coils
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Bose-Einstein Condensation (BEC)

• Bosonic Atoms having integer spin
• Low temperature very close to absolute zero (10s
  of nK)
• Atoms are in the same lowest energy level
• Atoms are absolutely identical
• Act as one giant wave

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How to make a BEC

• 1. Laser cooling and trapping

• 2. Turn laser light off and turn 3-D magnetic
  trap on

• 3. Evaporative cooling

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Building High Voltage Power Supply

• Motivation
• To supply high voltage for MCP
• Micro-Channel Plate
• A component to detect Ions
• Phosphor screen

Ions
Phosphor screen
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Building High Voltage Power Supply
Power supply
High V-source
Current meter
Aluminum Box
Power plug
Power switch
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Building High Voltage Power Supply
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In addition

• Other projects
• Laser Amplifier
• Pulsed Coil
• Atom Laser
• Software Applied
• MATLAB
• Mathematica
• Photoshop
• Adobe Illustrator
• AutoCAD

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Acknowledgements

• Prof. Georg Raithel
• Graduate Students
• Aaron Reinhard
• Brenton Knuffman
• Eric Paradis
• Kelly Younge
• Mallory Traxler
• Melinda Morang
• Rachel Sapiro
• Rahul Mhaskar
• Rui Zhang
• Undergraduate Students
• Jordan Montgomery
• Varun Vaidya

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• Thanks for your attention !