**4. Conclusions**

In this chapter, we proposed a novel method for time-resolved studies that relies on taking advantage of relativistic effects rather than on advances in laser technology or electron beam compression. It was shown that by using currently available technology, this method could improve time resolution by 2 or 3 orders of magnitude. This has the potential of opening up a whole new domain of ultrafast dynamics that was previously unattainable. With ever more powerful accelerators being proposed, there will be great potential to achieve truly remarkable time resolutions that far exceed the status quo. We hope this would lead to new avenues of collaboration between the particle physics community and the ultrafast science community, which will maximize the research potential of particle accelerator facilities worldwide.
