TH2I1
Fermilab, Batavia, Illinois, USA
This talk focuses on the upcoming first ever direct 6-dimensional tracking of a single electron in a storage ring with the goal to enable a new class of beam diagnostic technologies. This will allow high precision characterization of a single-particle dynamics. This works builds off previous experimental 3-dimensional tracking of the dynamics of a single electron in the Fermilab Integrable Optics Test Accelerator (IOTA)*. At IOTA, we will detect single photons randomly emitted by an electron over many turns to precisely reconstruct its trajectory. State of the art technologies of photon detection have temporal and spatial resolution sufficient for the high-precision tracking if coupled with advanced analysis algorithms. Complete tracking of a point-like object will enable the first measurements of single-particle dynamical properties, including dynamical invariants, amplitude-dependent oscillation frequencies, and chaotic behavior. These single-particle measurements will be employed for long-term tracking simulations, training of AI/ML algorithms, and ultimately for precise predictions of dynamics in present and future accelerators.
* A. Romanov et al., ’Experimental 3-dimensional tracking of the dynamics of a single electron in the Fermilab Integrable Optics Test Accelerator,’ J. Instrum., vol. 16, P12009, Dec 2021
CERN, Meyrin, Switzerland
TH2I3
Fermilab, Batavia, Illinois, USA
The first realization of stochastic cooling in the optical regime was recently achieved at Fermilab’s Integrable Optics Test Accelerator (IOTA) storage ring using the transit-time method of Optical Stochastic Cooling (OSC). OSC uses free-space electromagnetic waves as the signaling medium, pickup and kicker undulators to couple the radiation to the circulating particle beam, and optical amplifiers for signal amplification. Stable cooling was successfully demonstrated in one, two and three dimensions and OSC experiments were performed with a single electron stored in IOTA. The total cooling force in these non-amplified OSC experiments was approximately an order-of-magnitude larger than the natural longitudinal synchrotron-radiation damping. These achievements required precise alignment and femto-second accuracy of the particles with their respective undulator-radiation pulses along with a wide range of technical and diagnostic elements. We describe the integrated OSC system, its performance and comparison to theoretical expectations, and our OSC R&D program that includes advanced concepts in beam cooling and control.