Explanipedia

Compensation of head-on beam-beam induced resonance driving terms and tune spread in the RHIC Open

W. Fischer, Xiaofeng Gu, C. Liu, Y. Luo, R. Michnoff , et al. · 2024

Commissioning results of the BNL Alternating Gradient Synchrotron booster AC dipole Open

Kiel Hock, Anthony Curcio, H. Huang, F. Méot, James Jamilkowski , et al. · 2023

Exploratory Data Analysis on the RHIC Cryogenics System Compressor Dataset Open

Yuan Gao, Kyle A. Brown, R. Michnoff, L. Nguyen, B. van Kuik , et al. · 2023

The Relativistic Heavy Ion Collider (RHIC) Cryogenic Refrigerator System is the cryogenic heart that allows RHIC superconducting magnets to operate. Parts of the refrigerator are two stages of compression composed of ten first and five sec…

Gold-gold luminosity increase in RHIC for a beam energy scan with colliding beam energies extending below the nominal injection energy Open

C. Liu, Petra Adams, E. Beebe, S. Binello, I. Blackler , et al. · 2022

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…

Fast Scanning Diamond Detector for Electron Beam Profile Monitoring Open

V. Konovalov, S. Bellavia, Jean Clifford Brutus, R. Michnoff, Toby Miller , et al. · 2021

Recently new high energy electron cooling beam projects, CeC and LEReC, were proposed at Brookhaven National Laboratory as part of a future electron-ion collider. Efficient electron cooling requires a high quality, high power electron beam…

Technology Spinoff and Lessons Learned from the 4-Turn ERL CBETA Open

K. Deitrick, Nilanjan Banerjee, Adam Bartnik, Johan Berg, Stephen J. Brooks , et al. · 2021

The Cornell-BNL ERL Test Accelerator (CBETA) developed several energy-saving measures: multi-turn energy recovery, low-loss superconducting radiofrequency (SRF) cavities, and permanent magnets. With green technology becoming imperative for…

Large Radial Shifts in the EIC Hadron Storage Ring Open

Steve Peggs, J. Scott Berg, K. Deitrick, K. A. Drees, B. Gamage , et al. · 2021

The Electron Ion Collider will collide hadrons in the Hadron Storage Ring (HSR) with ultra-relativistic electrons in the Electron Storage Ring. The HSR design trajectory includes a large radial shift over a large fraction of its circumfere…

Conceptual Design Overview of the Electron Ion Collider Instrumentation Open

D. Gassner, Jonathan Bellon, M. Blaskiewicz, Alexei Blednykh, Leo Dalesio , et al. · 2021

A new high-luminosity Electron Ion Collider (EIC) is being developed at Brookhaven National Laboratory (BNL). The conceptual design [1] has recently been completed. The EIC will be realized in the existing RHIC facility. In addition to imp…

RHIC Beam Energy Scan Operation with Electron Cooling in 2020 Open

Chuyu Liu, Petra Adams, E. Beebe, S. Binello, I. Blackler , et al. · 2021

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…

RHIC Delayed Abort Experiments Open

Matthieu Valette, D. Bruno, K. A. Drees, Kenneth Hartmann, G. Heppner , et al. · 2021

For RHIC to operate at its top energy (100 GeV/n) while protecting the future sPHENIX detector, spontaneous and asynchronous firing of abort kicker modules (pre-fires) have to be avoided. A new triggering circuit for the abort kickers was …

Beam Position Monitor Calibration by Rapid Channel Switching Open

R. Hulsart, R. Michnoff, Sergei Seletskiy, Peter Thieberger · 2021

One of the requirements for low-energy RHIC electron cooling (LEReC) is a small relative angle between the ion and electron beams as they co-propagate. In order to minimize relative electron-ion trajectories angle, BPM measurements of both…

Review of the Fixed Target Operation at RHIC in 2020 Open

Chuyu Liu, Petra Adams, E. Beebe, S. Binello, I. Blackler , et al. · 2021

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 …

Permanent magnets for the return loop of the Cornell-Brookhaven energy recovery linac test accelerator Open

Stephen J. Brooks, G. Mahler, John Cintorino, J. Tuozzolo, R. Michnoff · 2020

214 neodymium permanent magnets have been manufactured for the return loop of the CBETA multi-turn ERL at Cornell University. There are 5 types of quadrupole and combined-function gradient magnets using a variant of the circular Halbach de…

Radial Shift Lattice Design using BMAD toolkit Open

Henry Lovelace, K. Dietrick, A. Drees, B. Gamage, C. Liu , et al. · 2020

The electron-ion collider (EIC) conceptual design [1] requires that the hadron storage ring (HSR) be able to demonstrate radial shifts using a dual rigidity system. The dual rigidity system is a system in which the dipoles in the utility s…

CBETA: First Multipass Superconducting Linear Accelerator with Energy Recovery Open

Adam Bartnik, Nilanjan Banerjee, D. L. Burke, J. Crittenden, K. Deitrick , et al. · 2020

Energy recovery has been achieved in a multipass linear accelerator, demonstrating a technology for more compact particle accelerators operating at higher currents and reduced energy consumption. Energy delivered to the beam during the fir…

Some considerations about switching BPM channels Open

R. Hulsart, R. Michnoff, Peter Thieberger, Sergei Seletskiy · 2020

Switching the signals from two BPM buttons between the two channels was suggested for the LEReC BPMs. In this note we discuss how such a switching can help with determining the true position of the beam. We also describe the setup of the s…

Experimental Demonstration of Hadron Beam Cooling Using Radio-Frequency Accelerated Electron Bunches Open

A. V. Fedotov, Z. Altinbas, S. Belomestnykh, I. Ben‐Zvi, M. Blaskiewicz , et al. · 2020

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…

Essential Instrumentation for the Characterization of ERL Beams Open

Nilanjan Banerjee, Adam Bartnik, J. van den Berg, Stephen P. Brooks, K. Deitrick , et al. · 2020

The typical requirement of Energy Recovery Linacs to produce beams with high repetition rate and high bunch charge presents unique demands on beam diagnostics. ERLs being quite sensitive to time of flight effects necessitate the use of bea…

Accurate setting of electron energy for demonstration of first hadron beam cooling with rf-accelerated electron bunches Open

Sergei Seletskiy, M. Blaskiewicz, A. Drees, A. V. Fedotov, W. Fischer , et al. · 2019

The world’s first electron cooling based on the rf acceleration of electron bunches was experimentally demonstrated at the Low Energy RHIC Electron Cooler (LEReC) at Brookhaven National Laboratory. The critical step in obtaining cooling of…

Preparation for the Beam Energy Scan II at RHIC in 2020 Open

Chuyu Liu, Ian Blacker, M. Blaskiewicz, Kevin Brown, D. Bruno , et al. · 2019

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…

Beam Commissioning Results from the CBETA Fractional Arc Test (CBETA Note 030) Open

Colwyn Gulliford, Stephen Peggs, Nilanjan Banerjee, Adam Bartnik, J. Crittenden , et al. · 2019

This work describes first commissioning results from the Cornell Brookhaven ERL Test Accelerator fractional arc test. These include the recommissioning of the Cornell photoinjector, the first full energy operation of the main linac with be…

Equipment Protection System for CBETA Open

Nilanjan Banerjee, Adam Bartnik, J. Scott Berg, Sherry Brooks, John Dobbins , et al. · 2019

The ultimate goal of CBETA is to be the first high-current multi turn Energy Recovery Linac operating at 40 mA. The power of highest energy beam at this configuration is going to be 6 MW. Hence equipment protection against radiation is an …

Beam Commissioning Results from the CBETA Fractional Arc Test Open

Colwyn Gulliford, Nilanjan Banerjee, Adam Bartnik, J. Scott Berg, J. Crittenden , et al. · 2019

This work describes first commissioning results from the Cornell Brookhaven Energy Recovery Test Accelerator Fractional Arc Test. These include the recommissioning of the Cornell photo-injector, the first full energy operation of the main …

The CBETA Beam Position Monitor (BPM) System Design and Strategy for Measuring Multiple Simultaneous Beams in the Common Beam Pipe Open

R. Michnoff, John Dobbins, R. Hulsart · 2019

CBETA, a 4-pass electron Energy Recovery Linac (ERL) is presently under construction at Cornell University and is a collaboration between Brookhaven National Laboratory (BNL) and Cornell University. Beam commissioning began in March 2019 w…

Overview of Beam Instrumentation and Commissioning Results from the Coherent Electron Cooling Experiment at BNL Open

Toby Miller, Jean Clifford Brutus, William C. Dawson, D. Gassner, R. Hulsart , et al. · 2019

The Coherent Electron Cooling (CeC) Proof-of-Principle experiment [1], installed in the RHIC tunnel at BNL, has completed its second run. In this experiment, an FEL is used to amplify patterns imprinted on the cooling electron beam by the …

Fixed Target Operation at RHIC in 2019 Open

Chuyu Liu, Ian Blacker, M. Blaskiewicz, Kevin Brown, D. Bruno , et al. · 2019

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 …

Coherent Electron Cooling (CeC) Experiment at RHIC: Status and Plans Open

Vladimir Litvinenko, Z. Altinbas, Jean Clifford Brutus, Anthony Di Lieto, D. Gassner , et al. · 2019

We will present currents status of the CeC experiment at RHIC and discuss plans for future. Special focus will be given to unexpected experimental results obtained during RHIC Run 18 and discovery of a previously unknown type of microwave …

CBETA - Novel Superconducting ERL Open

R. Michnoff, Nilanjan Banerjee, J. Barley, Adam Bartnik, Ivan Bazarov , et al. · 2019

We are successfully commissioning a unique Cornell University and Brookhaven National Laboratory Electron Recovery Linac (ERL) Test Accelerator ’CBETA’ [1]. The ERL has four accelerating passes through the supercon-ducting linac with a sin…

CBETA Permanent Magnet Production Run Open

Stephen J. Brooks, G. Mahler, R. Michnoff, J. Tuozzolo · 2019

214 neodymium permanent magnets have been manufactured for the return loop of the CBETA multi-turn ERL being built at Cornell University. There are 5 types of quadrupole and combined-function gradient magnets using a variant of the circula…

CBETA Beam Position Monitor System Design and Plan for Measurement of Different Energy Bunches (CBETA Technical Note 030) Open

R. Michnoff, John Dobbins, R. Hulsart · 2018

The purpose of this document is to describe the overall CBETA Beam Position Monitor (BPM) and Bunch Arrival Monitor (BAM) system architectures and define how the different energy accelerating and decelerating bunches will be measured.

R. Michnoff YOU? Author Swipe