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Laser Driven Target at MIT. Chris Crawford, Ben Clasie, Jason Seely, Dipangkar Dutta, Haiyan Gao. Introduction Optical pumping Spincell optimization Components of the LDT Atomic Fraction Results Preliminary Polarization Future Work. Overview. Atomic Beam Source

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laser driven target at mit
Laser Driven Target at MIT

Chris Crawford, Ben Clasie, Jason Seely,Dipangkar Dutta, Haiyan Gao

  • Introduction
  • Optical pumping
  • Spincell optimization
  • Components of the LDT
  • Atomic Fraction Results
  • Preliminary Polarization
  • Future Work

Laser Driven Target http://ldt.mit.edu

slide2
Overview
  • Atomic Beam Source
  • Well established technology
  • Can create pure spin states
  • 8 x 1016 atoms/s
  • 84% atomic fraction
  • 80% polarization
  • Laser Driven Target
  • Compact design
  • Active pumping—higher flux
  • 2 x 1018 atoms/s
  • 60% atomic fraction
  • 50% polarization

Laser Driven Target http://ldt.mit.edu

slide3
Optical Pumping

At spin temperature equilibrium, the population of each spin state n(mF) is controlled by the Boltzmann equation.

Laser Driven Target http://ldt.mit.edu

slide4
Spincell Optimization
  • Developed a code to simulate recombination and depolarization
  • One must minimize the Surface Area / Volume ratio, and the length of the transport tube Dimensions: 2” diameter spherical spincell with 5 cm neck

Laser Driven Target http://ldt.mit.edu

slide5
Target Chamber

Laser Driven Target http://ldt.mit.edu

slide6
Polarimeter

Laser Driven Target http://ldt.mit.edu

slide7
Sextupole Magnet

Laser Driven Target http://ldt.mit.edu

slide8
QMA Detector

Laser Driven Target http://ldt.mit.edu

slide9
Dissociator Trials

Laser Driven Target http://ldt.mit.edu

slide10
Atomic Fraction

Laser Driven Target http://ldt.mit.edu

slide11
Preliminary Polarization

Laser transmission

Laser transmission

QMA mass 1 signal

QMA mass 1 signal

  • polarization: 20% (+ helicity) and 23% (- helicity)
  • polarization preserving mirrors only 87% efficient

Laser Driven Target http://ldt.mit.edu

slide12
Future Work
  • Redo polarization tests with correct mirrors.
  • Fine-tune operational parameters.
  • Investigate the quality of the spincell coating.
  • Investigate performance of sextupole filter.
  • Run tests with deuterium.
  • Redesign target for operation at BLAST.

Laser Driven Target http://ldt.mit.edu

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