Center for Bright Beams

11/09/2021

CBB Newsletter - Fall 2021 - https://mailchi.mp/d68a6a29d32e/cbbnewsletter_fall_2019-5725465

10/04/2021

Cornell High Energy Synchrotron Source is hiring! More info in the post below.

Have you ever wanted to work at a particle accelerator? Well now is your chance - CHESS is HIRING for several positions including management, research, scientist, and technician positions.⁠
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The CHESS team is innovative, dynamic and welcoming, and as employees of Cornell University, enjoys excellent employee support and benefits.⁠
If you or someone you know is a good fit, we strongly encourage you to apply and/or share widely!⁠
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More info here: https://www.chess.cornell.edu/about/job-openings
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Cornell University embraces diversity and seeks candidates who will contribute to a climate that supports students, faculty and staff of all identities and backgrounds. We strongly encourage individuals from underrepresented and/or marginalized identities to apply.

09/20/2021

Center for Bright Beams awarded $22M in grant renewal.

“CBB is the only center in the world that brings together an interdisciplinary approach to address critical challenges limiting accelerator science. This renewed funding will help us build on our successes to date, which have benefited enormously from our collaborative approach.”

National Science Foundation (NSF)
BYU The University of Chicago University of Florida The University of New Mexico - UNM Northern Illinois University UCLA Arizona State University Fermi National Accelerator Laboratory Berkeley Lab SLAC National Accelerator Laboratory

A collaboration of researchers led by Cornell has been awarded $22.5 million from the National Science Foundation to continue gaining the fundamental understanding needed to transform the brightness of electron beams available to science, medicine and industry.

01/20/2021

An exclusive look inside a particle accelerator located 40 feet below the Cornell campus in Ithaca, NY. Watch live via Facebook.

Ohh, what do these buttons do? Join us for our live virtual tour Thursday the 21st at 11 AM EST to find out! https://fb.me/e/d6tG9FlMe

09/01/2020

Check out a short recap of the 2020 CBB Annual Meeting and Symposium here https://bit.ly/2YAwJ45. With links to recorded talks by guest speakers Dr. Corrie Moreau of Cornell (speaking on “Diversity in Science – An Everyone Issue,”) and Carmel Lee, Cornell’s Director of Research Development (who hosted “Writing to Win - a grant writing workshop" as part of our professional development series). Also featuring three pedagogical lectures by CBB faculty on photo-emission physics, superconductivity, and data management.

08/25/2020

RESEARCH HIGHLIGHT - Nb3Sn SRF cavities used to accelerate particles close to the speed of light sometimes contain defects such as islands of depleted Sn, grain boundaries, and surface roughness. It is very difficult to measure how these defects impact vortex nucleation and reduce the maximum magnetic field they can operate at. This article demonstrates how we use computers to simulate vortex nucleation and how to calculate Hsh in Time-Dependent Ginzburg-Landau theory. This foundational work sets the stage for future calculations where we show the impact of material specific defects on Nb3Sn SRF cavity performance. By informing CBB and the accelerator community which defects are the most detrimental we hope to provide insight into potential changes in Nb3Sn fabrication that can lead to higher accelerating gradients and brighter beams. (FULL HIGHLIGHT HERE - https://cbb.classe.cornell.edu/Research/GinzburgLandau.html) National Science Foundation (NSF) BYU

08/18/2020

IN THIS IMAGE - A focused view of the electron probability density in space over time. The electron begins at its ground state in the metal towards the left. As the external field is applied, the electron may be excited and/or tunnel out of the metal. Once outside the metal, it may propagate and either return to the metal or escape permanently. Various energy bands may be seen just from this image from the different slopes of electron probability density bunches. This simulation was performed using a 20 GV/m peak enhanced field at 800 nm. Note that the snippet shown here is only a piece of the full simulation—neither spatial nor temporal boundaries are included. (FULL HIGHLIGHT HERE - https://cbb.classe.cornell.edu/Research/QuantumSimulations.html) National Science Foundation (NSF) UCLA

08/11/2020

RESEARCH HIGHLIGHT - The creation of the first X-ray free-electron laser at SLAC in 2009 introduced the scientific community to coherent photons of unprecedented high brightness. These photons were produced, however, at the cost of billion-dollar-class price tags and kilometer-scale machine footprints. This has meant that getting access to these photons is very difficult, and those who do get access do so with a strict time budget. Now, the development of critical enabling technologies, in particular high-field cryogenically cooled accelerating cavities and short-period, high-field undulator magnets, opens the door to an X-ray free-electron laser less than 30 m in length that could potentially meet the needs of some of these scientists. We present here critical potential design elements for such a soft X-ray free-electron laser. To this end, simulation results are presented focusing on the problems in preservation of beam brightness associated with the process of bunch compression and novel ways in which those problems can be resolved. This is one of the featured present goals of the CBB theme area in Beam Dynamics and Control. (FULL HIGHLIGHT HERE - https://cbb.classe.cornell.edu/Research/CompactXray.html) National Science Foundation (NSF) SLAC National Accelerator Laboratory UCLA

08/04/2020

RESEARCH HIGHLIGHT - Niobium (Nb) superconducting radio frequency (SRF) cavity surfaces are terminated by a native bulk oxide layer whose composition and structure directly influences SRF cavity performance. This work demonstrated that the surface crystallographic orientation of Nb determines the structure of this oxide layer; Nb(100) formed well-ordered (3x1)-O ladder structures while NbO on Nb(111) had no discernable long-range order. The energy barrier for oxygen dissolution from NbO to the bulk was determined to be 0.6 eV, and structural evolution of the (3x1)-O surface as a function of oxygen dissolution was investigated using scanning tunneling microscopy (STM). It was shown that oxygen dissolution occurred preferentially at the midpoint of the (3x1)-O ladder structure, which may indicate a preferred surface site for oxygen dissolution. (Full Highlight Here - https://cbb.classe.cornell.edu/Research/OxygenDissolution.html) National Science Foundation (NSF) The University of Chicago

07/28/2020

RESEARCH HIGHLIGHT - Photocathode improvements are one of the directions the CBB is exploring to increase the brightness of electron sources. However, non-linear forces from space charge or optical elements can cause the beam to lose brightness on its way from the source to the point where it is used. In systems where this happens, the full benefit of newly developed photocathode technologies may not be realized. In this work, we show that for three specific photoinjector configurations (which are representative of commonly used real-world systems), those brightness degrading effects are small enough that photocathode research remains a viable path to brighter beams. (Full Highlight Here - https://cbb.classe.cornell.edu/Research/LowEmittance.html) National Science Foundation (NSF) Cornell Laboratory for Accelerator-based Sciences and Education SLAC National Accelerator Laboratory Cornell University Physics Cornell University The University of Chicago

06/08/2020

Join CBB as it participates in ShutdownSTEM, beginning with a community watch of the movie Just Mercy.

https://www.youtube.com/watch?v=q7MxXxFu6fI&feature=share&fbclid=IwAR0JK42qXRCnKnozPANOksifuh-B2g3UeoSzWYmIrB1WZfgRW_YFyK1ducM

https://www.shutdownstem.com/