Explanipedia

Superconducting Low-beta Nb$_3$Sn Cavity for ATLAS and Future Ion Accelerators Open

Todd Petersen, Grigory Eremeev, B. Tennis, Nikki Tagdulang, Y. Zhou , et al. · 2025

We report on a Nb$_3$Sn-coated low-beta superconducting radio frequency (SRF) cavity intended for accelerating ions. We aim to apply the cavity in ATLAS, our Argonne National Laboratory user facility for nuclear physics studies with ion be…

Advanced surface treatments for medium-velocity superconducting cavities for high-accelerating gradient continuous-wave operation Open

K. McGee, S. Kim, Kyle Elliott, Andrei Ganshyn, W. Hartung , et al. · 2023

Electro-Mechanical Properties of Spoke-Loaded Superconducting Cavities Open

Zachary Conway, J. D. Fuerst, M. Kelly, K.W. Shepard, G. Davis , et al. · 2023

This paper presents experimental data characterizing the electro-mechanical properties of superconducting spoke-loaded cavities developed for high-intensity ion-linac applications, such as the cw ANL Advanced Exotic Beams Laboratory (AEBL)…

Low-Level RF Control of Microphonics in Superconducting Spoke-Loaded Cavities Open

Zachary Conway, M. Kelly, S.I. Sharamentov, K.W. Shepard, G. Davis , et al. · 2023

This paper presents the results of cw RF frequency control and RF phase-stabilization experiments performed with a piezoelectric fast tuner mechanically coupled to a superconducting, 345 MHz, ? = 0.5 triple-spoke-loaded cavity operating at…

Latest development of electropolishing optimization for 650 MHz Niobium cavity Open

Vijay Chouhan, D. Bice, D. Burk, Saravan Kumar Chandrasekaran, Andrew Cravatta , et al. · 2023

cavity surface area yielded a rough equator surface of the cavity. The grain step height on the equator weld position was measured to be ~ 32 μm. The rough surface was attributed to preferential grain etching confirmed by a polarization cu…

Advanced surface treatments for medium-velocity superconducting RF cavities for high accelerating gradient continuous-wave operation Open

K. McGee, S. Kim, Kyle Elliott, Andrei Ganshyn, W. Hartung , et al. · 2023

Nitrogen-doping and furnace-baking are advanced high-Q0 recipes developed for 1.3 GHz TESLA-type cavities. These treatments will significantly benefit the high-Q0 linear accelerator community if they can be successfully adapted to differen…

Demonstration of Niobium Tin in 218 MHz Low-beta Quarter Wave Accelerator C Open

Todd Petersen, M. Kelly, Thomas Reid, M. Kedzie, Guihai Chen , et al. · 2023

A 218 MHz quarter wave niobium cavity has been fabricated for the purpose of demonstrating Nb3Sn technology on a low-beta accelerator cavity. Niobium-tin has been established as a promising next generation SRF material, but development has…

Electropolishing parameters study for surface smoothening of low- 650 MHz five-cell niobium superconducting radio frequency cavity Open

Vijay Chouhan, G. Wu, B. Guilfoyle, Thomas Reid, T. Ring , et al. · 2023

Accelerator commissioning and rare isotope identification at the Facility for Rare Isotope Beams Open

J. Wei, Hiroyuki Ao, B. Arend, Steven Beher, G. Bollen , et al. · 2022

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…

Study on Electropolishing Conditions for 650 MHz Niobium SRF Cavity [Poster] Open

Vijay Chouhan, D. Bice, F. Furuta, M. Martinello, Mei Zhen Ng , et al. · 2022

voltage of 18 V and with an initial cathode (cathode-I) having a cathode surface area of ~5% of the cavity surface area yielded a rough equator surface of the cavity. The grain step height on the equator weld position was measured to be ~3…

Medium-velocity superconducting cavity for high accelerating gradient continuous-wave hadron linear accelerators Open

K. McGee, S. Kim, Kyle Elliott, Andrei Ganshyn, W. Hartung , et al. · 2021

We present the first rf studies of the medium-beta superconducting radio frequency (SRF) elliptical cavities designed for Michigan State University's Facility for Rare Isotope Beams (FRIB) energy upgrade linac. The proposed energy upgrade …

Design options for a superconducting ion linac Open

B. Mustapha, J.-W. Kim, Jiho Jang, Hyunchang Jin, M. Kelly , et al. · 2021

Design of the multi-ion injector linac for the JLAB EIC (JLEIC) Open

B. Mustapha, Zachary Conway, M. Kelly, Alexander Plastun, P. N. Ostroumov · 2020

An Electron Ion Collider (EIC) is the highest priority for future U.S. accelerator-based nuclear physics facility following the completion of the Facility for Rare Isotope Beams (FRIB). Two laboratories are competing to host the future EIC…

Advances of the FRIB project Open

J. Wei, Hiroyuki Ao, Steven Beher, Nathan Bultman, F. Casagrande , et al. · 2019

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…

A post accelerator for the U.S. rare isotope accelerator facility. Open

P. N. Ostroumov, M. Kelly, A. A. Kolomiets, J. A. Nolen, M. Portillo , et al. · 2018

The proposed Rare Isotope Accelerator (RIA) Facility includes a post-accelerator for rare isotopes (RIB linac) which must produce high-quality beams of radioactive ions over the full mass range, including uranium, at energies above the cou…

Surface processing for bulk niobium superconducting radio frequency cavities Open

M. Kelly, Thomas Reid · 2017

The majority of niobium cavities for superconducting particle accelerators continue to be fabricated from thin-walled (2-4mm) polycrystalline niobium sheet and, as a final step, require material removal from the radio frequency (RF) surfac…

A new 2 Kelvin Superconducting Half-Wave Cavity Cryomodule for PIP-II Open

Zachary Conway, A. Barcikowski, Glenn Cherry, Richard Fischer, S. M. Gerbick , et al. · 2015

Argonne National Laboratory has developed and is implementing a novel 2 K superconducting cavity cryomodule operating at 162.5 MHz. This cryomodule is designed for the acceleration of 2 mA H-/proton beams from 2.1 to 10 MeV as part of the …

Advanced low-beta cavity development for proton and ion accelerators Open

Zachary Conway, M. Kelly, P. N. Ostroumov · 2015

Superconducting Harmonic Cavity for the Advanced Photon Source Upgrade Open

M. Kelly, A. Barcikowski, J. Carwardine, Zachary Conway, D. Horan , et al. · 2015

A new bunch lengthening cryomodule using a single-cell ‘higher-harmonic’ superconducting cavity (HHC) based on the TESLA shape and operating at the 4th harmonic (1408 MHz) of the main RF is under development at Argonne. The system will be …

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