High-Frequency EPR Add-on for Gyrotron-based DNP Systems

Dynamic Nuclear Polarization (DNP) is a powerful method to enhance the signal intensity of an NMR experiment. DNP combines the methods of EPR with NMR. However, often the EPR properties of the paramagnetic polarizing agents are unknown under DNP conditions. The Bridge12 EPR add-on for gyrotron-based DNP systems allows researchers to study the EPR properties of the DNP sample in-situ under the identical conditions under which the DNP experiment is performed.
Add EPR to your gyrotron-based DNP System

Add EPR to your gyrotron-based DNP System

The Bridge12 EPR add-on is a compact EPR system that can be added to any gyrotron-based DNP system. It enables researchers to:

  • Perform in-situ cw/pulsed EPR spectroscopy
  • Record the cw EPR spectrometer of the DNP sample in the MAS probe
  • Measure EPR relaxation parameters to optimize polarizing agents

Easily integrated into the transmission Line

Easily integrated into the transmission Line

The EPR add-on is easily integrated into the transmission line connecting the gyrotron to the DNP system. A short section of the corrugated waveguide is replaced with a waveguide switch to allow switching between EPR and DNP operation. The system uses the MAS-DNP probe and no additional EPR probe is required. By eliminating the need for additional superconducting magnets, Bridge12 can deliver this capability at a fraction of the cost of an additional high-field EPR spectrometer.

Compact, low-loss Quasi-Optics

Compact, low-loss Quasi-Optics

At the heart of the system is a compact, low-loss quasi-optical duplexer for efficient signal detection. The system features its own frequency-agile solid-state microwave source and can be added to DNP systems operating from 200 to > 500 GHz, spanning the complete range of DNP frequency currently used.

Many additional features available

The system is available as a basic continuos wave (cw) spectrometer or as a fully functional time domain EPR spectrometer. Possible options are:

  • Superheterodyne detection for increased sensitivity
  • Pulsed EPR capabilities to measure T1/T2 relaxation times
  • Arbitrary waveform generated (AWG) pulses for increased excitation bandwidth

Many of these features can also be added later on to the system.

Technical Specifications

  • Operating Frequency: 263, 329, 395, 527 GHz (exact frequency depends on the NMR system)
  • Output power: The microwave power strongly depends on the operating frequency. At 263 GHz > 200 mW are currently available.
  • A connection kit is available to integrate into the transmission line. Manual switch to select EPR or DNP operation
  • The spectrometer is completely computer controlled using SpecMan4EPR as the acquisition and control software
  • Compact footprint of about 12 in. x 12 in.
  • Support structure included

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