ECRIS2020 - Classification: NACB

Paper	Title	Page
NACB01	Development of a Compact Linear ZAO NEG Pumping System	167
	S.A. Kondrashev, E.N. Beebe, B.D. Coe, J. Ritter, T. Rodowicz, R. Schoepfer, S.M. Trabocchi BNL, Upton, New York, USA
	Funding: This work was supported by the US Department of Energy under contract number DE-SC0012704 and by the National Aeronautics and Space Administration. 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. Ultra-high vacuum is extremely important for stable and reliable operation of EBIS/T devices. We have developed a linear pumping module based on the ZAO NEG unit commercially available from SAES Getters. This pumping system will be used for the Extended EBIS Upgrade which is presently under development at BNL. A ZAO NEG module has been modified to be heated up to 600 °C by passing up to 120 A of DC current through a stainless-steel cage for required NEG activation and reactivation temperature cycles. A method of pumping speed measurements using pulsed gas injection into the vacuum chamber has been developed and used for characterization of the ZAO NEG-based linear pumping system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB01
About •	Received ※ 29 September 2020 — Revised ※ 30 September 2020 — Accepted ※ 21 October 2020 — Issue date ※ 16 April 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

NACB02	Status of the High-Current EBIS Charge Breeder for the Facility for Rare Isotope Beams	172
	H.J. Son, A.I. Henriques, C. Knowles, A.C.C. Villari FRIB, East Lansing, Michigan, USA E.N. Beebe BNL, Upton, New York, USA D.B. Crisp, A. Lapierre, S. Nash NSCL, East Lansing, Michigan, USA
	Funding: work supported by the National Science Foundation under Grant No. PHY-1565546 The ReA post-accelerator of the National Supercon-ducting Cyclotron Laboratory (NSCL) at Michigan State University includes an Electron-Beam Ion Trap (EBIT) operating as a charge breeder. The Facility for Rare Iso-tope Beams (FRIB) is being implemented. After comple-tion, rare-isotopes beam rates are expected to exceed in some case 10<sup>10</sup> particles per second (pps). The charge capacity of the ReA EBIT is insufficient to handle those rates. Therefore, parts of the TEST EBIS from the Brookhaven National Laboratory (BNL) were transferred to the NSCL to build a High-Current Electron-Beam Ion Source (HCEBIS). The HCEBIS features an electron gun that can provide a current up to 4 A for an estimated trap charge capacity of 10<sup>11</sup> elementary charges. This paper presents the HCEBIS specifications, electron-beam cur-rent measurements to test its cathode, and simulation results for its implementation in the ReA post-accelerator. It also presents charge-capacity measurements conducted with the ReA EBIT that demonstrate that the HCEBIS will be able to handle beam rates of more than 10<sup>10</sup> pps.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB02
About •	Received ※ 30 September 2020 — Revised ※ 01 October 2020 — Accepted ※ 30 November 2020 — Issue date ※ 13 March 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

NACB03	Determining the Fraction of Extracted 3He in the 3He²⁺ Charge State	177
	M.K. Gronert, E.N. Beebe BNL, Upton, New York, USA M.K. Gronert Drew University, Madison, New Jersey, USA
	Funding: Work supported by the US Department of Energy under contract number DE-SC0012704 and by the National Aeronautics and Space Administration The parameter space of the TOF was explored using analytic methods as well as computer simulation to improve the design and functionality of a similar device that was constructed as a prototype for the Electron Beam Ion Source (EBIS) in 2019. A simulation of the beam line optics was produced in Opera-2D CAD software to show that other optical elements would not materially affect the operation of the TOF. This will allow for true measurements of the charge state ratios of helium for EBIS and extended EBIS operation in support of the Electron Ion Collider. EBIS operators will use the device to maximize the fraction of 3He ions in the 3He²⁺ state. Different geometries were explored as well to maximize the effectiveness of the device and to meet the performance criterion and physical constraints of the EBIS beam line.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB03
About •	Received ※ 14 October 2020 — Revised ※ 29 October 2020 — Accepted ※ 19 May 2021 — Issue date ※ 19 July 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

NACB04	Ion Simulations, Recent Upgrades and Tests with Titan’s Cooler Penning Trap	181
	R. Silwal, J. Dilling, B.A. Kootte, A.A. Kwiatkowski, S.F. Paul TRIUMF, Vancouver, Canada J. Dilling UBC & TRIUMF, Vancouver, British Columbia, Canada G. Gwinner, B.A. Kootte University of Manitoba, Manitoba, Canada R. Simpson UW/Physics, Waterloo, Ontario, Canada
	TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN) facility has the only on-line mass measurement Penning trap (MPET) at a radioactive beam facility that uses an electron beam ion trap (EBIT) to enhance mass precision and resolution. EBITs can charge breed exotic isotopes, making them highly charged, thereby improving the precision of atomic mass measurement as the precision scales linearly with the charge state. However, ion bunches charge bred in the EBIT can have larger energy spread, which poses challenges for mass measurements. A cooler Penning trap (CPET) is currently being developed off-line at TITAN to sympathetically cool the highly charged ions (HCI) with a co-trapped electron plasma, prior to their transport to the MPET. To evaluate the integration of the CPET into the TITAN beamline and to optimize the beam transport, ion trajectory simulations were performed. Hardware upgrades motivated by these simulations and previous test measurements were applied to the off-line CPET setup. Ions and electrons were co-trapped for the first time with the CPET. Progress and challenges on the path towards HCI cooling and integration with the on-line beam facility are presented
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB04
About •	Received ※ 17 October 2020 — Revised ※ 23 October 2020 — Accepted ※ 01 December 2020 — Issue date ※ 07 February 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Development of a Compact Linear ZAO NEG Pumping System

167

S.A. Kondrashev, E.N. Beebe, B.D. Coe, J. Ritter, T. Rodowicz, R. Schoepfer, S.M. Trabocchi
BNL, Upton, New York, USA

Funding: This work was supported by the US Department of Energy under contract number DE-SC0012704 and by the National Aeronautics and Space Administration.
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. Ultra-high vacuum is extremely important for stable and reliable operation of EBIS/T devices. We have developed a linear pumping module based on the ZAO NEG unit commercially available from SAES Getters. This pumping system will be used for the Extended EBIS Upgrade which is presently under development at BNL. A ZAO NEG module has been modified to be heated up to 600 °C by passing up to 120 A of DC current through a stainless-steel cage for required NEG activation and reactivation temperature cycles. A method of pumping speed measurements using pulsed gas injection into the vacuum chamber has been developed and used for characterization of the ZAO NEG-based linear pumping system.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB01

About •

Received ※ 29 September 2020 — Revised ※ 30 September 2020 — Accepted ※ 21 October 2020 — Issue date ※ 16 April 2021

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

NACB02

Status of the High-Current EBIS Charge Breeder for the Facility for Rare Isotope Beams

172

H.J. Son, A.I. Henriques, C. Knowles, A.C.C. Villari
FRIB, East Lansing, Michigan, USA
E.N. Beebe
BNL, Upton, New York, USA
D.B. Crisp, A. Lapierre, S. Nash
NSCL, East Lansing, Michigan, USA

Funding: work supported by the National Science Foundation under Grant No. PHY-1565546
The ReA post-accelerator of the National Supercon-ducting Cyclotron Laboratory (NSCL) at Michigan State University includes an Electron-Beam Ion Trap (EBIT) operating as a charge breeder. The Facility for Rare Iso-tope Beams (FRIB) is being implemented. After comple-tion, rare-isotopes beam rates are expected to exceed in some case 1010 particles per second (pps). The charge capacity of the ReA EBIT is insufficient to handle those rates. Therefore, parts of the TEST EBIS from the Brookhaven National Laboratory (BNL) were transferred to the NSCL to build a High-Current Electron-Beam Ion Source (HCEBIS). The HCEBIS features an electron gun that can provide a current up to 4 A for an estimated trap charge capacity of 1011 elementary charges. This paper presents the HCEBIS specifications, electron-beam cur-rent measurements to test its cathode, and simulation results for its implementation in the ReA post-accelerator. It also presents charge-capacity measurements conducted with the ReA EBIT that demonstrate that the HCEBIS will be able to handle beam rates of more than 1010 pps.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB02

About •

Received ※ 30 September 2020 — Revised ※ 01 October 2020 — Accepted ※ 30 November 2020 — Issue date ※ 13 March 2021

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

NACB03

Determining the Fraction of Extracted 3He in the 3He²⁺ Charge State

177

M.K. Gronert, E.N. Beebe
BNL, Upton, New York, USA
M.K. Gronert
Drew University, Madison, New Jersey, USA

Funding: Work supported by the US Department of Energy under contract number DE-SC0012704 and by the National Aeronautics and Space Administration
The parameter space of the TOF was explored using analytic methods as well as computer simulation to improve the design and functionality of a similar device that was constructed as a prototype for the Electron Beam Ion Source (EBIS) in 2019. A simulation of the beam line optics was produced in Opera-2D CAD software to show that other optical elements would not materially affect the operation of the TOF. This will allow for true measurements of the charge state ratios of helium for EBIS and extended EBIS operation in support of the Electron Ion Collider. EBIS operators will use the device to maximize the fraction of 3He ions in the 3He²⁺ state. Different geometries were explored as well to maximize the effectiveness of the device and to meet the performance criterion and physical constraints of the EBIS beam line.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB03

About •

Received ※ 14 October 2020 — Revised ※ 29 October 2020 — Accepted ※ 19 May 2021 — Issue date ※ 19 July 2021

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

NACB04

Ion Simulations, Recent Upgrades and Tests with Titan’s Cooler Penning Trap

181

R. Silwal, J. Dilling, B.A. Kootte, A.A. Kwiatkowski, S.F. Paul
TRIUMF, Vancouver, Canada
J. Dilling
UBC & TRIUMF, Vancouver, British Columbia, Canada
G. Gwinner, B.A. Kootte
University of Manitoba, Manitoba, Canada
R. Simpson
UW/Physics, Waterloo, Ontario, Canada

TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN) facility has the only on-line mass measurement Penning trap (MPET) at a radioactive beam facility that uses an electron beam ion trap (EBIT) to enhance mass precision and resolution. EBITs can charge breed exotic isotopes, making them highly charged, thereby improving the precision of atomic mass measurement as the precision scales linearly with the charge state. However, ion bunches charge bred in the EBIT can have larger energy spread, which poses challenges for mass measurements. A cooler Penning trap (CPET) is currently being developed off-line at TITAN to sympathetically cool the highly charged ions (HCI) with a co-trapped electron plasma, prior to their transport to the MPET. To evaluate the integration of the CPET into the TITAN beamline and to optimize the beam transport, ion trajectory simulations were performed. Hardware upgrades motivated by these simulations and previous test measurements were applied to the off-line CPET setup. Ions and electrons were co-trapped for the first time with the CPET. Progress and challenges on the path towards HCI cooling and integration with the on-line beam facility are presented

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-NACB04

About •

Received ※ 17 October 2020 — Revised ※ 23 October 2020 — Accepted ※ 01 December 2020 — Issue date ※ 07 February 2021

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)