2020 North American Charge Breeding (NACB) Workshop

Name: 2020 North American Charge Breeding (NACB) Workshop
Start: 2020-10-01T08:30:00-04:00
End: 2020-10-02T17:30:00-04:00
Location: Virtual via Zoom

1 Oct 2020, 08:30 → 2 Oct 2020, 17:30 America/Detroit

Virtual via Zoom

Alain Lapierre (MSU)

Registration

NACB Participants

Participants

Alain Lapierre
Alessio Galatà
Ana Henriques
Ana Lesage
Andrey Bondarchenko
Anna Kwiatkowski
Antonio VIllari
Brad Schultz
Brian Roeder
Carmelo Sebastiano Gallo
Cheng Qian
Chris Charles
Clayton Dickerson
Daniel Crisp
Dmitry Pugachev
Donald May
Edward Beebe
Friedhelm Ames
Ghanshyambhai Khatri
Haitao Ren
Hyock-Jun Son
Ish Mukul
Jaime Cardona
Jose Rodriguez
Joseph Adegun
Julien ANGOT
Laurent Maunoury
Liangting Sun
Luigi Celona
Mathieu Cavenaile
Matthew Gronert
Michael Blessenohl
Mickaël Dubois
Miguel Lozano
Myriam Migliore
Niels Bidault
OLIVER KESTER
Richard Vondrasek
Robert Scott
Roshani Silwal
Sergey Kondrashev
Shixiang PENG
Stefan Schwarz
Tasha Summers
Thomas ANDRE
wei huang
Yilin Wang
Zachary Hockenbery

Contact

allen@frib.msu.edu

Thursday, 1 October
- Thu, 1 Oct
- Fri, 2 Oct
- 09:00 → 09:15
  
  Workshop Announcements
  
  Announcements
- 09:15 → 09:45
  
  An Overview of NSCL and FRIB 30m
  
  Speaker: Dr Alain Lapierre (MSU)
- 09:45 → 10:15
  
  Operational Performance of the ATLAS Electron Beam Ion Source 30m
  
  An Electron Beam Ion Source charge breeder has been in operation at Argonne National Laboratory since 2017 and has been delivering radioactive ions for the ATLAS experimental program. Single charge state efficiencies average 16% with the radioactive species accounting for up to 99% of the beam incident on target. The electron beam collector which was repaired in early 2019 continues to perform well demonstrating the long term viability of the electroforming process. To better discriminate Mo-106 and Tc-106, an MR-TOF was incorporated into the charge breeding operation with no observed degradation in performance. As part of a study of the simultaneous transport of two beam species, a gas leak valve was installed on the source to produce a Xe-132 beam simultaneously with a Cs-133 beam. The trap emptying process has been studied in order to elongate the extracted pulse with pulse widths up to 14 ms during 10 Hz operation.
  
  This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 and used resources of ANL’s ATLAS facility, an Office of Science User Facility
  
  Speaker: Richard Vondrasek (Argonne National Laboratory)
  
  9.45_R_Vondrasek.pdf
- 10:15 → 10:45
  
  An Introduction and Overview of the RHIC and Extended EBIS 30m
  
  Speaker: Dr Edward Beebe (BNL)
  
  NACB2020 RHIC and Extended EBIS- Beebe .pdf NACB2020 RHIC and Extended EBIS- Beebe .pptx
- 10:45 → 11:00
  
  Coffee Break 15m
- 11:00 → 11:30
  
  Experiment Preparation at the ReAccelerator 30m
  
  The ReAccelerator (ReA) at the National Superconducting Cyclotron Laboratory at Michigan State University is a worldwide unique facility, as it is the only post-accelerator that reaccelerates rare-isotope beams produced by fast-projectile fragmentation. While stable nuclei are delivered from local ion sources, rare nuclei are produced by in-flight fragmentation or fission of primary beams accelerated by the Coupled Cyclotron. After selection according to their magnetic rigidity, the fast beams are thermalized (or “stopped”) in a combination of solid and gas stoppers before being reaccelerated. At ReA, 1+ ions from the stopping area are injected as continuous beams into a cooler and buncher gas-filled Paul trap before charge breeding of ion pulses with an Electron Beam Ion Trap (EBIT). Following charge breeding, highly charged ions are ejected, selected with a charge-over-mass separator, transported to a Radio-Frequency-Quadrupole (RFQ) accelerator and a superconducting linear accelerator (LINAC) and finally delivered to experimental setups.
  
  In the past years, ReA has proven its success and is now preparing to deliver beams at higher energies and faster pace. In the upcoming year, it is expected to provide 5000 hours of beam on target of stable and unstable beams up to 12 MeV/u. The rare isotope beams will be produced in batch mode. Success demands careful preparation before beam delivery. The preparation of beam times relies on carefully documenting previous runs, anticipation of possible issues, and most importantly, the selection of the charge state to reaccelerate, which is crucial for high efficiency, accounting beam contaminants, and reaching the requested reaccelerated beam energy.
  
  After introducing ReA and summarizing recent results, this talk will give an overview of preparation and documentation procedures before and during experimental runs.
  
  Speaker: Dr Ana Henriques (Facility for Rare Isotope Beam (FRIB), Michigan State University (MSU))
  
  11.00_A_Henriques_ReAccelerator.pptx
- 11:30 → 12:00
  
  Status of EBIS Commissioning at TRIUMF-CANREB 30m
  
  The Canadian Rare-isotope facility with Electron Beam ion source (CANREB) is currently being commissioned at TRIUMF in Vancouver, Canada. CANREB can accept stable or rare isotope beams from the existing ISAC facility, or from the Advanced Rare Isotope Laboratory (ARIEL) in the future. The incoming beams are pulsed using an RFQ cooler/buncher, and energy adjusted using a pulsed drift tube for injection into an EBIS. The EBIS is designed for a maximum electron beam current of 1 A with up to a 6 T magnetic field. The charge breeder can accept singly charged ions at energies up to 14 keV, which will be charge bred to m/q < 7. The extracted charge-bred beam will be separated using a Nier-type spectrometer, followed by transport to ISAC for post-acceleration to experiments. Results from initial EBIS commissioning, as well as an overall status report on CANREB, will be presented.
  
  Speaker: Dr Brad Schultz (TRIUMF)
  
  11.30_B_Schultz_EBIS_Commissioning.pptx
- 12:00 → 12:30
  
  Discussion
- 12:30 → 14:00
  
  Lunch Break 1h 30m
- 14:00 → 14:30
  
  The HCEBIS Charge Breeder for the Facility for Rare Isotope Beams 30m
  
  The Facility for Rare Isotope Beams, FRIB, is being implemented at Michigan State University (MSU). One-part of FRIB is the ReA post-accelerator, which includes an Electron Beam Ion Trap (EBIT) charge breeder. Currently, RIB are produced by fast-projectile fragmentation and fission in the Coupled-Cyclotron Facility (CCF). After production, these beams are then separated in-flight and thermalized in a helium gas cell before being transported to ReA for reacceleration up to several MeV/u for the nuclear physics program. After the CCF-to-FRIB transition, the production yield of rare isotopes will significantly increase. In some cases, rates are expected to exceed 10¹⁰ particles/s (pps). In addition, the user community for the Separator for Capture Reactions (SECAR) recoil separator has requested stable-isotope ion beams with rates up to 10¹⁰ pps.
  The ReA EBIT has a limited charge capacity of 10¹⁰ elementary (1+) charges, which is insufficient to efficiently charge breed RIB of high rates from FRIB to high charge states. To increase the charge capacity of the ReA charge breeder, a new High Current Electron Beam Ion Source (HCEBIS) is being constructed. The HCEBIS uses the “backbones” of the TEST EBIS, which was transferred from the Brookhaven National Laboratory (BNL) in 2018. The HCEBIS can operate with an electron-beam current exceeding 4 A, allowing the device to deliver highly charged ion beams of intensities expected to be more than 10¹⁰ ions per second. In this contribution, the status of the HCEBIS will be presented. The currently installed LaB6 cathode was tested to an emission current of 1.12 A without magnets in a test configuration. Electron-beam transport simulations were performed from cathode to collector. The emittance of extracted beams was simulated. Moreover, this contribution will also present measurements of the charge capacity of the ReA EBIT in the continuous injection mode that were taken during beam tests to provide intense beams before the installation of the HCEBIS. These measurements can be used to determine through extrapolation the expected charge capacity of the HCEBIS.
  
  Speaker: Dr Hyock-Jun Son (Facility for Rare Isotope Beams (FRIB), Michigan State University (MSU))
  
  14.00_H_Son_HCEBIS.pptx
- 14:30 → 15:00
  
  Using TRIUMF’s Cooler Penning trap to Cool Highly Charged Radioactive Ions Bred in an Electron Beam Ion Trap for Enhanced Mass Measurement Precision 30m
  
  Atomic mass measurements of short-live radioactive isotopes are useful to determine the nuclear structure and deviations from the existing nuclear models, to explore the nuclear astrophysics reaction paths that are responsible for creating visible matter and to test predictions of fundamental physics beyond Standard model. Electron beam ion source/trap (EBIST) can charge breed these exotic isotopes, making them highly charged, hence improving the precision of atomic mass measurement as the precision scales linearly with the charge of the species. TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN) facility has the only online mass measurement Penning trap (MPET) in a radioactive beam facility using an EBIT to enhance mass measurement resolution by using highly charged ions (HCI).
  HCIs bred in an EBIT can have larger energy spread creating challenges to mass measurements. A cooler Penning trap (CPET) has been developed at TITAN to sympathetically cool the HCI via Coulomb collisions with simultaneously trapped plasma of self-cooled electrons, prior their transport to the MPET. Combined with the EBIT and MPET, CPET will result in more precise mass measurements of short-lived radioactive nuclides, as well as improve our understanding of the ion-electron beam dynamics. To evaluate the integration of CPET to the MPET in the radioactive beam line setup and to optimize the beam transport, electron and ion trajectory simulations were performed. Hardware upgrades motivated by these simulations and previous challenges were conducted to the off-line CPET setup. Successful co-trapping of ions and electrons was achieved for the first time with the CPET. The progress and challenges towards HCI cooling and integration with the on-line beam facility will be discussed in this presentation.
  
  Speaker: Dr Roshani Silwal (TRIUMF)
  
  14.30_R_Silwal_TRIUMF.pptx
- 15:30 → 15:45
  
  Coffee Break 15m
- 15:45 → 16:15
  
  An Operator-Focused HMI Philosophy 30m
  
  Good operator interfaces, alarms, and operating instructions. These are essential for supporting your operations team as they learn to run your system. So why are they often afterthoughts, thrown together at the last minute and dropped in the control room? Spending time early to consider final operation can save time and frustration in the long run. Here I outline an operator-focused HMI philosophy, with a set of key questions to be considered throughout the design and development process to help provide an efficient transition to operations.
  
  Speaker: Tasha Summers (SLAC)
  
  Operator Focused HMI.pptx
- 16:15 → 16:45
  
  Discussion
- 16:45 → 16:50
  
  Adjourn 5m
Friday, 2 October
- Thu, 1 Oct
- Fri, 2 Oct
- 09:00 → 09:15
  
  Workshop Announcements
  
  Announcements
- 09:15 → 09:45
  
  Conceptual Design of an Electrostatic Trap for High Intensity Pulsed Beam 30m
  
  Highly charged ion sources play an important role in the advancement of heavy ion accelerators worldwide. The beam requirements of highly charged heavy ions from new accelerators have driven the performance of ion sources to their limits and beyond. In parallel to developing new technologies to enhance the performance of ECR ion source, this paper presents a conceptual design of an ion trap aiming to convert a cw ion beam into a short beam pulse with high compression ratios. With an electron gun, a solenoid and a set of drift tubes, the injected ions will be trapped radially and axially. By manipulating the potential of drift tubes, ions can be accumulated with multiple injections and extracted at a fast or slow mode. This paper presents the simulation and the design of this ion trap prototype.
  
  Speaker: Wei Huang (Institute of Modern Physics)
  
  9.15_W_Huang_Conceptual_Design.pptx
- 09:45 → 10:15
  
  Studies of ISOLDE-REXEBIS Charge-Breeding Performances and Probing of Very Low Intensity Contamination 30m
  
  At the Isotope mass Separator On-Line DEvice (ISOLDE) facility based at CERN, rare isotopes are produced from 1.4 GeV-proton collisions onto a target. Radioactive ion beams of interest are either delivered to low-energy experimental stations or manipulated and accelerated to higher energies, through REX/HIE-ISOLDE post-accelerator. Prior to post-acceleration through REX/HIE-ISOLDE linac, ions of interest are charge-bred in the REX-Electron Beam Ion Source.
  A method is presented to characterize residual gas contamination extracted from REXEBIS at an intensity scale lower than sub-femto Ampere ion beam currents. Sets of contamination spectra are compared for two different types of electron guns, depending on key operational parameters, such as the confinement time and the electron charge density. The general performances of REXEBIS are evaluated and an attempt is made to correlate experimentally probed mechanisms with simulations.
  
  Speaker: Niels Bidault (CERN & University of Rome)
  
  9.45_N_Bidault.pdf
- 10:15 → 10:45
  
  LNL GANIL LPSC Collaboration on the Contaminants Reduction in ECR Charge Breeders 30m
  
  Contaminants reduction in Electron Cyclotron Resonance Charge Breeders (ECRCB) is a key point for the future experiments foreseen at INFN-LNL and GANIL Isotope Separation On Line (ISOL) facilities. Depending on the resolution of the spectrometer installed downstream an ECRCB, a radioactive ion beam (RIB) could be contaminated by the impurities introduced in the breeding stage, due to the plasma-surface interaction. This is particularly true in case of low intensity RIBs. An ongoing collaboration between INFN-LNL, LSPC and GANIL laboratories aims at improving the RIBs purity by decreasing the number and/or the amount of the possible contaminants. Comparative experminents will be done at LPSC using different techniques, like covering the plasma chamber wall with liners in several material. Different configurations of the ECRCB will also be tested, with the enhancement of the efficiency and charge breeding time parameters as additionnal objectives. A presentation of this program is proposed together with the recent upgrade of the LPSC 1+N+ test bench, which goal was to improve the vacuum quality and cleanliness of all the beam line devices.
  
  Speaker: Julien ANGOT (Université Grenoble Alpes, CNRS, Grenoble INP, LPSC-IN2P3, 38000 Grenoble, France)
  
  10.15_J_Angot_LNL_GANIL.pdf
- 10:45 → 11:00
  
  Coffee Break 15m
- 11:00 → 11:30
  
  Diagnostics for ATLAS Reaccelerated RIB Operations 30m
  
  The Argonne Tandem Linear Accelerator System (ATLAS) is upgrading the suite of diagnostics used to optimize and deliver radioactive ion beams from the Californium Rare Isotope Breeder Upgrade (CARIBU) Electron Beam Ion Source (EBIS) charge breeder. Historically beta decay detectors were used exclusively throughout the facility from low (<50 keV) to high energies (>100 MeV), but they have important limitations which will be addressed. In addition to the current beta decay detectors, multi-channel plate (MCP) and gas ionization detectors will be deployed. Each detector type provides unique advantages that will enable ATLAS to improve the transmission, quality, and operational efficiency of CARIBU RIB delivery.
  
  This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357, and used resources of ANL’s ATLAS facility, which is a DOE Office of Science User Facility.
  
  Speaker: Clayton Dickerson (Argonne National Lab)
- 11:30 → 12:00
  
  Design of BNL Extended EBIS Vacuum System 30m
  
  An upgrade of RHIC EBIS, the extended EBIS, is presently under development at Brookhaven National Laboratory to increase the intensity of the Au32+ ion beams by 40%–50% to 2.1 ⋅ 109 Au32+ ions/pulse at the booster ring entrance. Generation of intense beams of polarized 3He2+ ions with up to ∼ 5 ⋅ 1011 ions/pulse for the RHIC and the future electron–ion collider is a goal of the EBIS upgrade project as well.
  Design of the extended EBIS vacuum system will be presented and discussed in this talk.
  
  Work supported by the US Department of Energy under contract number DE-SC0012704 and by the National Aeronautics and Space Administration.
  
  Speaker: Dr Sergey Kondrashev (BNL)
  
  11.30_S_Kondrashev.pdf
- 12:00 → 12:30
  
  Discussion
- 12:30 → 14:00
  
  Lunch Break 1h 30m
- 14:00 → 14:30
  
  Improvement of the Efficiency and Beam Quality of the TRIUMF Charge-State Booster 30m
  
  The Electron Cyclotron Resonance Ion Source (ECRIS) is a versatile and reliable source to charge-breed rare isotopes in TRIUMF’s Isotopes Separation and Acceleration (ISAC) facility. Significant research work has been done by different groups worldwide to improve the efficiency and performance of the ECRIS as a charge state booster (CSB). The most recent of these research works is the implementation of the two-frequency heating on an ECRIS and optimization of the extraction of charge bred ions.
  At the ISAC facility of TRIUMF, a 14.5 GHz PHOENIX booster which has been in operation since 2010 was recently upgraded to accommodate the two-frequency heating system using a single waveguide. The efficiency for charge breeding into a single charge state, which depends on the rare isotope that is being charge-bred, has been determined to be between 1 – 6 %. The charge state booster is being upgraded to improve its charge breeding efficiency. A detailed investigation of the effect of the two-frequency heating technique on the intensity, emittance and the efficiency of the extracted beam is presently being conducted.
  Furthermore, the injection and the extraction of highly charged ions from the CSB are also a major topic of the work that can is addressed by simulations. The TRIUMF CSB is being simulated to investigate beam loss at the injection side, as well as the dependence of the emittance of the extracted beam on the plasma and extraction parameters. The results of the investigation will provide a deep understanding of beam tuning to improve the beam quality of the booster. For the ion injection and the extraction simulation, the axial magnetic field of the TRIUMF CSB was recently modelled in OPERA. The modelled magnetic field will be compared with a magnetic field measurement in the future to ensure that the modelled field genuinely described the solenoid magnetic field of the ECRIS.
  
  Speaker: Joseph Adegun (TRIUMF)
  
  NACB2020_Joseph_Adegun.pptx
- 14:30 → 15:00
  
  Simulations of Charge State Breeding with an EBIS for the CANREB Project at TRIUMF 30m
  
  The CANadian Rare isotope facility with Electron-Beam ion source (CANREB) at TRIUMF delivers beams of highly-charged ions of rare isotopes to experiments. The Electron Beam Ion source (EBIS) is an essential part of CANREB where ions are charge-bred by collisions with an electron beam. We present simulation results for the CANREB EBIS using TRAK (version 8.0 professional).
  The EBIS geometry was modelled assuming cylindrical symmetry, with TRAK generating the EM field map based on currents and electrode potentials applied during commissioning. The calculated electron trajectories in the presence of the strong magnetic field (up to 6T), emittance and acceptance of the EBIS will be discussed as well as potential limitations of the system arising from these results. Breeding efficiencies were estimated using the CBSIM code. These simulations are aimed at a better understanding of ion motions and charge-state breeding inside the CANREB-EBIS. Results will be used to optimize beam injection and extraction, implement pulse stretching for the extracted ions and closed shell breeding.
  
  Speaker: Mathieu Cavenaile (TRIUMF)
  
  14.30_M_Cavenaile.pptx
- 15:00 → 15:30
  
  Determining the Fraction of Extracted (Polarized) 3He Ions in the 3He2+ State 30m
  
  Speaker: Mr Gronert
  
  15.00_M_Gronert.pptx
- 15:30 → 15:45
  
  Coffee Break 15m
- 15:45 → 16:15
  
  Discussion
- 16:15 → 16:45
  
  Discussion: Closing Word
- 16:45 → 17:15
  
  Lab Tour: Virtual Lab Tour
- 17:15 → 17:20
  
  Adjourn 5m

2020 North American Charge Breeding (NACB) Workshop

Virtual via Zoom

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