Ultrafast Electron Microscopy Module to Upgrade Existing Commercial Electron Microscopes
This report covers progress in the development of a flexible longitudinal electron optical system based on high-precision radio-frequency cavities for short and intense electron bunch compressions, both in the energy and time domains. The proposed system is designed to be inserted into an existing transmission electron microscope column to upgrade its temporal resolution. Active phase-space control enables broad ranges of material, nanoscience and technologies applications involving highly demanding ultrafast core-level spectroscopy and ultrafast single-shot material research. The high-dose mode is currently not feasible in commercial systems. While the basic concept has been demonstrated in a customized electron optical column, adapting the same technologies into an existing electron microscope will require delicate design and laboratory tests to ensure robust performance. Niowave, Inc. built the resonant cavity used as a radio-frequency buncher to demonstrate the concepts of active space-charge control at the Laboratory for Ultrafast Nanoscale Imaging and Spectroscopy’s test facilities at Michigan State University. In this STTR project, Niowave and MSU are partnering to develop the next realization of this radiofrequency (RF) lens and make this technology available as a drop-in upgrade for existing commercial electron microscopes. This realization would revolutionize the future of electron microscope design and could even transform an aging fleet of steady-state electron microscopes into powerful ultrafast imaging and spectroscopy instruments. These systems would be widely used in industrial and academic settings for material characterizations. In Phase I of this project, Niowave designed the mechanics for the rough tuner of the cavity frequency and interface points for the thermoelectric coolers that perform fine control of the cavity frequency. This system was delivered to the MSU team who then confirmed the performance of the mechanical tuner and measured the phase stability of the cavity. In collaboration with outside experts, MSU and Niowave have designed a new timing architecture for the electron gun and RF lens which will mitigate some of the observed drifts and improve the timing resolution of the overall system.
- Research Organization:
- Niowave, Inc., Lansing, MI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- DOE Contract Number:
- SC0018529
- OSTI ID:
- 1491464
- Type / Phase:
- STTR (Phase I)
- Report Number(s):
- DOE-NIOW-18529-1
- Country of Publication:
- United States
- Language:
- English
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