Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session K02: Wilson and Dissertation Prize SessionInvited Live Streamed Prize/Award
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Sponsoring Units: DPF DPB Chair: Tao Han, University of Pittsburgh; Frank Zimmermann, CERN Room: Broadway South |
Sunday, April 10, 2022 1:30PM - 1:51PM |
K02.00001: Sakurai Dissertation Award: A Cosmological Lithium Solution Invited Speaker: Seth Koren The cosmological lithium problem---that the observed primordial abundance is lower than theoretical expectations by a factor of a few---is the most statistically significant anomaly of SMΛCDMmν, and has resisted decades of attempts by cosmologists, nuclear physicists, and astronomers alike to root out systematics. Beginning with the conspiratorial observation that the atomic number of lithium matches the number of particle generations Ng, we uncover a surprisingly close link to fundamental physics. |
Sunday, April 10, 2022 1:51PM - 2:12PM |
K02.00002: DPB Dissertation Award (2022): Statistical Properties of Undulator Radiation: Classical and Quantum Effects Invited Speaker: Ihar Lobach Two experiments were carried out to study the statistical properties of undulator radiation in the Integrable Optics Test Accelerator (IOTA) storage ring at Fermilab. The first experiment studied the turn-to-turn fluctuations in the power of the radiation generated by an electron bunch (1--3 billion electrons). This effect is related to the interference of fields radiated by different electrons. Changes in the relative electron positions and velocities inside the bunch result in fluctuations of the total emitted energy per pass. Generally, these turn-to-turn fluctuations depend on the full 6D phase-space distribution of the electron bunch. Therefore, the measured fluctuations can be used to infer some electron bunch parameters. Bunch lengths had been measured by this method previously. Our experiment in IOTA revealed the possibility to measure transverse emittances of electron bunches. This non-invasive diagnostic technique may be particularly beneficial for the existing and next-generation low-emittance high-brightness ultraviolet and x-ray synchrotron light sources. The second experiment studied the photon statistics of the undulator radiation generated by a single electron circulating in the ring. In this regime, any classical interference-related collective effects were eliminated, and the quantum fluctuations could be studied in detail. On average, there was only one photocount per several hundred revolutions in IOTA. The collected data were analyzed to find possible deviations from the expected Poisson process exhibiting uncorrelated detection events. In addition, the arrival times of the photocounts were used to track the longitudinal motion of a single electron and to compare it with simulations. This allowed us to determine several dynamical parameters of the storage ring such as the phase jitter of the radiofrequency cavity and the dependence of the synchrotron motion period on amplitude. |
Sunday, April 10, 2022 2:12PM - 2:33PM |
K02.00003: DPB Outstanding Paper Award: Two-color X-ray FEL by photocathode laser emittance spoiler Invited Speaker: Carlo Vicario A novel and noninvasive method for high-energy two-color x-ray FEL emission is demonstrated at SwissFEL. In the experiment, a laser emittance spoiler pulse is overlapped with the primary photocathode laser pulse to locally spoil the beam emittance and inhibit the FEL emission, ultimately resulting in X-ray emission at two wavelengths. High spectral stability and the possibility to independently control the duration and the intensity ratio between the two-color X-ray pulses is demonstrated. The laser emittance spoiler enables shot-to-shot selection between one and two-color FEL emission and further, it is compatible with high repetition-rate FELs, as it does not contribute to beam losses. |
Sunday, April 10, 2022 2:33PM - 2:55PM |
K02.00004: Wilson Prize Recipient (2022): The Evolution of the Fermilab Accelerator Complex Invited Speaker: Stephen D Holmes With the commissioning of the Fermilab Tevatron proton-antiproton collider in the mid-1980s, the stage was set for operations at the energy frontier for the next several decades. Yet, two things were clear even then: the performance demands on the Tevatron would grow dramatically over the years; and the ultimate fate of the Tevatron collider would most likely be obsolescence. This talk will describe how the Fermilab accelerator complex evolved from the 1990s onward in response to the needs of the collider program, while establishing a post-Tevatron capability. Particular emphasis will be placed on the roles of flexibility, opportunity, and risk in developing and constructing particle accelerators with long-term, evolving, missions. |
Sunday, April 10, 2022 2:55PM - 3:17PM |
K02.00005: Wilson Prize Recipient (2022) Invited Speaker: George W Foster Yuri Orlov Wilson Prize Recipient |
Sunday, April 10, 2022 3:17PM - 3:18PM |
K02.00006: Tanaka Dissertation Prize Acknowledgment (Melissa A. Hutcheson)
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