Salvatore Polizzo
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View article: The mapping & avoidance of high order cavity modes
The mapping & avoidance of high order cavity modes Open
In this paper a technique developed in 2016 is presented for mapping the multidimensional, multi-mode high order mode landscape of a beam driven super conducting RF cavity. The initial use case for this technique was intended to allow long…
View article: Gold-gold luminosity increase in RHIC for a beam energy scan with colliding beam energies extending below the nominal injection energy
Gold-gold luminosity increase in RHIC for a beam energy scan with colliding beam energies extending below the nominal injection energy Open
The Beam Energy Scan phase II (BES-II), performed in the Relativistic Heavy Ion Collider (RHIC) from 2019 to 2021, explored the phase transition between quark-gluon plasma and hadronic gas. BES-II exceeded the goal of a fourfold increase i…
View article: Operational Experience and Redesign of the Tuner without Spring Fingers for the LEReC Warm Cavity
Operational Experience and Redesign of the Tuner without Spring Fingers for the LEReC Warm Cavity Open
A folded coaxial tuner without spring fingers was designed for the Low Energy RHIC electron Cooler (LEReC) 2.1 GHz warm cavity. During RHIC run 2019, this tuner was found to cause cavity trips via different failure modes. After analyzing t…
View article: RHIC Beam Energy Scan Operation with Electron Cooling in 2020
RHIC Beam Energy Scan Operation with Electron Cooling in 2020 Open
RHIC provided Au-Au collisions at beam energies of 5.75 and 4.59 GeV/nucleon for the physics program in 2020 as a part of the Beam Energy Scan II experiment. The operational experience at these energies will be reported with emphasis on th…
View article: Review of the Fixed Target Operation at RHIC in 2020
Review of the Fixed Target Operation at RHIC in 2020 Open
As part of the Beam Energy Scan (BES) physics program, RHIC operated in Fixed Target mode at various beam energies in 2020. The fixed target experiment, achieved by scraping the beam halo of the circulating beam on a gold ring inserted in …
View article: Experimental Demonstration of Hadron Beam Cooling Using Radio-Frequency Accelerated Electron Bunches
Experimental Demonstration of Hadron Beam Cooling Using Radio-Frequency Accelerated Electron Bunches Open
Cooling of beams of gold ions using electron bunches accelerated with radio-frequency systems was recently experimentally demonstrated in the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. Such an approach is new and op…
View article: Preparation for the Beam Energy Scan II at RHIC in 2020
Preparation for the Beam Energy Scan II at RHIC in 2020 Open
RHIC will provide Au-Au collisions at beam energies of 5.75, 4.59 GeV/nucleon for physics program in 2020, and at beam energy of 3.85 GeV/nucleon for physics program in 2021 as part of the BeamEnergy Scan II (BES-II). The oper- ational exp…
View article: Fixed Target Operation at RHIC in 2019
Fixed Target Operation at RHIC in 2019 Open
RHIC operated in fixed target mode at beam energies 4.59, 7.3, and 31.2 GeV/nucleon in 2019 as a part of the Beam Energy Scan II program. To scrape beam halo effectively at the fixed target which is 2.05 m away from the center of the STAR …
View article: Upgrades for Subsystems of the 200 MeV H⁻ Linac at BNL
Upgrades for Subsystems of the 200 MeV H⁻ Linac at BNL Open
To increase the average current for isotope production by factor of two, we have undertaken several upgrades for our 50-year-old 200 MeV H⁻ linac. Average current will be double by increasing the beam pulse length. We are testing the DTL t…
View article: Performance of 112 MHz SRF Gun at BNL
Performance of 112 MHz SRF Gun at BNL Open
A 112 MHz SRF electron photoinjector (gun) was developed at Brookhaven National Laboratory to produce high-brightness and high-bunch-charge bunches for the coherent electron cooling proof-of-principle experiment. The gun is designed to del…
View article: Improving the Luminosity for Beam Energy Scan II at RHIC
Improving the Luminosity for Beam Energy Scan II at RHIC Open
The QCD (Quantum Chromodynamics) phase diagram has many uncharted territories, particularly the nature of the transformation from Quark-Gluon plasma (QGP) to the state of Hadronic gas. The Beam Energy Scan I (BES-I) at the Relativistic Hea…
View article: SRF and RF Systems for LEReC Linac
SRF and RF Systems for LEReC Linac Open
The Low Energy RHIC electron Cooling (LEReC) is under development at BNL to improve RHIC luminosity at low energies. It will consist of a short electron linac and two cooling sections, one for blue and one for yellow beams. For the first s…