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Advancements in Laser-Driven Target Technology at MIT

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  1. 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

  2. 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

  3. 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

  4. 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

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

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

  7. Sextupole Magnet Laser Driven Target http://ldt.mit.edu

  8. QMA Detector Laser Driven Target http://ldt.mit.edu

  9. Dissociator Trials Laser Driven Target http://ldt.mit.edu

  10. Atomic Fraction Laser Driven Target http://ldt.mit.edu

  11. 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

  12. 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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