Nathan Bultman
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View article: Erratum: Acceleration of uranium beam to record power of 10.4 kW and observation of new isotopes at Facility for Rare Isotope Beams [Phys. Rev. Accel. beams <b>27</b>, 060101 (2024)]
Erratum: Acceleration of uranium beam to record power of 10.4 kW and observation of new isotopes at Facility for Rare Isotope Beams [Phys. Rev. Accel. beams <b>27</b>, 060101 (2024)] Open
View article: Technological developments and accelerator improvements for the FRIB beam power ramp-up
Technological developments and accelerator improvements for the FRIB beam power ramp-up Open
The Facility for Rare Isotope Beams (FRIB) began operation with 1 kW beam power for scientific users in May 2022 upon completion of 8 years of project construction. The ramp-up to the ultimate beam power of 400 kW, planned over a 6-year pe…
View article: RF Design and Operating Results for a New 201.25 MHz RF Power Amplifier for LANSCE
RF Design and Operating Results for a New 201.25 MHz RF Power Amplifier for LANSCE Open
A prototype VHF RF Final Power Amplifier (FPA) for Los Alamos Neutron Science Center (LANSCE) has been designed, fabricated, and tested. The cavity amplifier has met the goals of generating 2.5 MW peak and 260 kW of average power, at an el…
View article: Completion of SNS-LINAC R&D Program
Completion of SNS-LINAC R&D Program Open
Los Alamos completed the R&D program for the SNS linac in September 2002 with publication of a comprehensive report on the SNS coupled-cavity linac (CCL) hot model. In this paper we summarize the results of this R&D program and its…
View article: Low-power RF tuning of the Spallation Neutron Source warm LINAC structures
Low-power RF tuning of the Spallation Neutron Source warm LINAC structures Open
The Spallation Neutron Source (SNS) is an accelerator-based neutron source being built at Oak Ridge National Laboratory. A conventional 402.5-MHz drift-tube linac (DTL) accelerates the H{sup -} beam from 2.5 to 86 MeV, followed by a 805-MH…
View article: FRIB Beam Power Ramp-up: Status and Plans
FRIB Beam Power Ramp-up: Status and Plans Open
After project completion on scope, on cost, and ahead of schedule, the Facility for Rare Isotope Beams began operations for scientific users in May of 2022. The ramp-up to a beam power of 400 kW is planned over a six-year period; 1 kW was …
View article: Progress towards the Facility for Rare Isotope Beams
Progress towards the Facility for Rare Isotope Beams Open
Muon-based facilities offer a unique potential to provide capabilities at both the Intensity Frontier with Neutrino Factories and the Energy Frontier with Muon Colliders ranging from the Higgs energy to the multi-TeV energy range. They rel…
View article: FRIB Transition to User Operations, Power Ramp Up, and Upgrade Perspectives
FRIB Transition to User Operations, Power Ramp Up, and Upgrade Perspectives Open
After project completion on scope, on cost, and ahead of schedule, the Facility for Rare Isotope Beams began operations for scientific users in May of 2022. During the first 12 months of user operations, the FRIB accelerator complex delive…
View article: Development and status of the FRIB 28 GHz SC ECRIS
Development and status of the FRIB 28 GHz SC ECRIS Open
T o meet a beam power requirement of 400 kW for heavy ions, a high intensity 28 GHz superconducting Electron Cyclotron Resonance (ECR) ion source is under development at the Facility for Rare Isotope Beams (FRIB) in collaboration with Lawr…
View article: Accelerator commissioning and rare isotope identification at the Facility for Rare Isotope Beams
Accelerator commissioning and rare isotope identification at the Facility for Rare Isotope Beams Open
In 2008, Michigan State University was selected to establish the Facility for Rare Isotope Beams (FRIB). Construction of the FRIB accelerator was completed in January 2022. Phased accelerator commissioning with heavy ion beams started in 2…
View article: Novel Materials and Concepts for Next-Generation High Power Target Applications
Novel Materials and Concepts for Next-Generation High Power Target Applications Open
Novel beam-intercepting materials and targetry concepts are essential to improve the performance, reliability and operation lifetimes of next generation multi-megawatt (multi-MW) accelerator target facilities. The beam-intercepting materia…
View article: Beam Commissioning Status and Future Plans of FRIB
Beam Commissioning Status and Future Plans of FRIB Open
View article: Commissioning Status of the Linac for the Facility for Rare Isotope Beams
Commissioning Status of the Linac for the Facility for Rare Isotope Beams Open
The Facility for Rare Isotope Beams will be completed in late 2021. Here, we report here on the current efforts to commission the first stages of the 200-MeV/u superconducting, continuous wave heavy-ion linac. The statuses of the cryogenic…
View article: Advances of the FRIB project
Advances of the FRIB project Open
The Facility for Rare Isotope Beams (FRIB) Project has entered the phase of beam commissioning starting from the room-temperature front end and the superconducting linac segment of first 15 cryomodules. With the newly commissioned helium r…
View article: Recent Advance in ECR Ion Sources
Recent Advance in ECR Ion Sources Open
High continuous wave (cw) current of highly charged ion beams are required for several heavy ion accelerator facilities including the Facility for Rare Isotope Beams (FRIB). In most cases, Electron-Cyclotron-Resonance (ECR) ion sources rem…
View article: FRIB Solenoid Package in Cryomodule and Local Magnetic Shield
FRIB Solenoid Package in Cryomodule and Local Magnetic Shield Open
FRIB cryomodule design has a feature: solenoid package(s) and local magnetic shields in the cryomodule. In this design, exposing SRF cavities to a very strong fringe field from the solenoid is concerned. A tangled issue between solenoid pa…
View article: Commissioning Status of the FRIB Front End
Commissioning Status of the FRIB Front End Open
The FRIB Front End was successfully commissioned in 2017 with commissioning goals achieved and Key Per-formance Parameters (KPP) demonstrated for both 40Ar⁹⁺ and 86Kr¹⁷⁺ beams. Two more ion species, 20Ne⁶⁺ and 129Xe²⁶⁺, have been commissio…
View article: FRIB Driver Linac Integration to be ready for Phased Beam Commissioning
FRIB Driver Linac Integration to be ready for Phased Beam Commissioning Open
The driver linac for Facility for Rare Isotope Beams (FRIB) will accelerate all stable ion beams from proton to uranium beyond 200 MeV/u with beam powers up to 400 kW. The linac now consists of 10⁴ superconducting quarter-wave resonators (…
View article: FRIBCavity and Cryomodule Performance, Comparison with the Design and Lessons Learned
FRIBCavity and Cryomodule Performance, Comparison with the Design and Lessons Learned Open
The superconducting driver linac for the Facility for Rare Isotope Beams (FRIB) requires the production of 46 cryomodules. Design is complete on all six cryomodule types which utilize four superconducting radio frequency (SRF) cavity desig…
View article: The FRIB SC-Linac - Installation and Phased Commissioning
The FRIB SC-Linac - Installation and Phased Commissioning Open
The Facility for Rare Isotope Beams (FRIB) superconducting (SC) driver linac is designed to accelerate all stable ions including uranium to energies above 200 MeV/u primarily with 46 cryomodules containing 324 quarter-wave resonators (QWR)…
View article: Commissioning of the FRIB RFQ
Commissioning of the FRIB RFQ Open
The radio-frequency quadrupole (RFQ) at the Facility for Rare Isotope Beams (FRIB) is a 4-vane type cavity designed to accelerate heavy ion beams with charge states Q/A between 1/7 and 1/3 from 12 keV/u to 0.5 MeV/u. The RFQ was assembled …
View article: Installation Progress on FRIB β=0.041 Cryomodules Toward Beam Commissioning
Installation Progress on FRIB β=0.041 Cryomodules Toward Beam Commissioning Open
The Facility for Rare Isotope Beams (FRIB) driver linac is to accelerate all the stable ion beams from proton to uranium beyond 200 MeV/u with beam powers up to 400 kW, which will be the first large-scale, CW SRF ion linac. The beam commis…
View article: Commissioning of the FRIB RFQ
Commissioning of the FRIB RFQ Open
The radio-frequency quadrupole (RFQ) at the Facility for Rare Isotope Beams (FRIB) is a 4-vane type cavity designed to accelerate heavy ion beams with charge states Q/A between 1/7 and 1/3 from 12 keV/u to 0.5 MeV/u. The RFQ was assembled …
View article: RF System for FRIB Accelerator
RF System for FRIB Accelerator Open
The RF system of the FRIB driver accelerator includes solid state amplifiers up to 18 kW operating at frequencies from 80.5 MHz to 322 MHz. Much higher power is required for the normal conducting RFQ, ~100 kW, and it is based on vacuum tub…
View article: FRIB Project Status and Beam Instrumentation Challenges
FRIB Project Status and Beam Instrumentation Challenges Open
With an average beam power two orders of magnitude higher than operating heavy-ion facilities, the Facility for Rare Isotope Beams (FRIB) stands at the power frontier of the accelerator family. This report summarizes the status of design, …
View article: Accelerator Physics Advances in FRIB (Facility for Rare Isotope Beams)
Accelerator Physics Advances in FRIB (Facility for Rare Isotope Beams) Open
This paper presents recent developments of accelerator physics related topics for the Facility for Rare Isotope Beams (FRIB) being built at Michigan State University. While extensive beam dynamics simulations including all known errors do …
View article: Progress of FRIB SRF Production
Progress of FRIB SRF Production Open
The Facility for Rare Isotope Beams (FRIB), under construction at Michigan State University, will utilize a driver linac to accelerate stable ion beams from protons to uranium up to energies of >200 MeV per nucleon with a beam power of up …
View article: Status of β=0.53 Pre-Production Cryomodule
Status of β=0.53 Pre-Production Cryomodule Open
The driver linac for the Facility for Rare Isotope Beams (FRIB) comprises four kinds of cavities (=0.041, 0.085, 0.29, and 0.53) and six types of cryomodules including matching modules. FRIB has started the fabrication of a β=0.53 preprodu…
View article: Design of a FRIB Half-Wave Pre-Production Cryomodule
Design of a FRIB Half-Wave Pre-Production Cryomodule Open
The driver linac for the Facility for Rare Isotope Beams (FRIB) will require the production of 48 cryomodules (CMs). In addition to the β=0.085 quarter-wave CM, FRIB has completed the design of a β=0.53 half-wave CM as a pre-production pro…
View article: FRIB Cryomodule Design and Production
FRIB Cryomodule Design and Production Open
The Facility for Rare Isotope Beams (FRIB), under con-struction at Michigan State University, will utilize a driver linac to accelerate stable ion beams from protons to ura-nium up to energies of >200 MeV per nucleon with a beam power of u…