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Jlab Status and Charge

This report details the latest developments in hybrid NdFeB undulators as demonstrated by Stephen Benson on March 5, 2012. Key highlights include the installation and conversion of a variable gap undulator at Daresbury, achieving 2.1 kW continuous wave (CW) power at 3.2 microns. The work encompasses various undulator designs, including the W80 and W55 wigglers, with significant power outputs and minimized phase errors. Future implementations aim to achieve shorter wavelengths through innovative designs derived from the Cornell Delta undulator.

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Jlab Status and Charge

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  1. Jlab Status and Charge Stephen Benson March 5, 2012

  2. IR Demo 41 periods Hybrid NdFeB 1.2 cm gap, fixed Krms= .98 Now installed at Daresbury and converted to variable gap. Achieved 2.1 kW CW at 3.2 microns

  3. Optical Klystron • Dispersion section • Length 58 cm • Dispersion >40 periods • for K2=16 • Gap 26 mm • Wavelength 20 cm • K2 1–16 • Number of periods 12 ea. • Gap 26 mm • Polarization vertical • Phase error <2 deg. Achieved 10 kW for 1 second pulses at 5.7 microns

  4. W80 Undulator • 29 periods • Electromagnet • 8 cm wavelength • Krms= 0.5-1.1 • rms phase error less than 1 degree

  5. W55 Wiggler • 30 periods • Hybrid NdFeB • 5.5 cm variable gap • Krms= 0.5-2.95 • Currently installed on IR Upgrade Achieved 14.3 kW CW at 1.6 microns

  6. W33 Cornell Wiggler • 60 periods • Hybrid NdFeB • 3.3 cm variable gap • Krms= 0.5-1.51 • Jaws returned to Cornell Achieved 200 Watts CW at 400 nm, mirror limited

  7. W33 ANL Wiggler • 64 periods • Hybrid wedged pole NdFeB • 3.3 cm variable gap • Krms= 0.5-1.51 • Presently installed on the UV Demo

  8. The Future To get to much shorter wavelengths with variable polarization we have to go with something like the Cornell Delta undulator design but much longer as proposed in our JLAMP proposal.

  9. Working Group Charge • Working Group 7 – Undulators • Evaluate present limitations of undulator capabilities and derive new concepts and technologies that alleviate these limitations for both linearly and circularly polarized undulators. • Consider methods to greatly improve the robustness of operation and to lower the cost of building and operating long, high quality undulators.

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