ECRIS2020 - List of Keywords (rfq)

Paper	Title	Other Keywords	Page
MOXZO02	Conceptual Design of Heavy Ion ToF-ERDA Facility Based on Permanent Magnet ECRIS and Variable Frequency RFQ Accelerator	ECR, ECRIS, LEBT, ion-source	21
	O.A. Tarvainen, D.C. Faircloth, A.P. Letchford STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom J. Julin, T. Kalvas JYFL, Jyväskylä, Finland
	Ion beam analysis is typically based on tandem accelerators and negative ions. The required 5-20 MeV energies for heavy ion time-of-flight elastic recoil detection analysis* (ToF-ERDA) can be achieved with a high charge state ion source and RFQ accelerator. We present a conceptual design of a ToF-ERDA facility based on a permanent magnet ECRIS and variable frequency RFQ accelerating 1-10 pnA of 40Ar⁸⁺, 84Kr¹⁷⁺ and 129Xe²⁴⁺ ions to 4-7, 10^-15 and 13-20 MeV. We present the PM ECRIS requirements focusing on the CUBE-ECRIS** with a quadrupole min-B field topology. Beam dynamics studies demonstrating good transmission of the heavy ion beams from the ion source to the RFQ entrance through the electrostatic low energy beam transport (LEBT) and a permanent magnet dipole are presented. The predicted LEBT transmissions of the CUBE-ECRIS (rectangular extraction slit) and a conventional ECRIS (circular extraction aperture) are compared. The conceptual design of the RFQ is described and the implications of the energy spread on the high energy beam transport are discussed. It is demonstrated that an energy spread below 0.2 % is necessary for appropriate resolution of the heavy ion ToF-ERDA. * J. Julin and T. Sajavaara, Nucl. Instrum. Methods Phys. Res. B 406, Part A, (2017), pp 61-65. ** T. Kalvas, O. Tarvainen, V. Toivanen and H. Koivisto, 2020 JINST 15 P06016.
	Slides MOXZO02 [10.204 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOXZO02
About •	Received ※ 25 September 2020 — Revised ※ 28 September 2020 — Accepted ※ 14 December 2020 — Issue date ※ 18 May 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	simulation, acceleration, electron, collider	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)

Paper

Title

Other Keywords

Page

MOXZO02

Conceptual Design of Heavy Ion ToF-ERDA Facility Based on Permanent Magnet ECRIS and Variable Frequency RFQ Accelerator

ECR, ECRIS, LEBT, ion-source

21

O.A. Tarvainen, D.C. Faircloth, A.P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
J. Julin, T. Kalvas
JYFL, Jyväskylä, Finland

Ion beam analysis is typically based on tandem accelerators and negative ions. The required 5-20 MeV energies for heavy ion time-of-flight elastic recoil detection analysis* (ToF-ERDA) can be achieved with a high charge state ion source and RFQ accelerator. We present a conceptual design of a ToF-ERDA facility based on a permanent magnet ECRIS and variable frequency RFQ accelerating 1-10 pnA of 40Ar⁸⁺, 84Kr¹⁷⁺ and 129Xe²⁴⁺ ions to 4-7, 10^-15 and 13-20 MeV. We present the PM ECRIS requirements focusing on the CUBE-ECRIS** with a quadrupole min-B field topology. Beam dynamics studies demonstrating good transmission of the heavy ion beams from the ion source to the RFQ entrance through the electrostatic low energy beam transport (LEBT) and a permanent magnet dipole are presented. The predicted LEBT transmissions of the CUBE-ECRIS (rectangular extraction slit) and a conventional ECRIS (circular extraction aperture) are compared. The conceptual design of the RFQ is described and the implications of the energy spread on the high energy beam transport are discussed. It is demonstrated that an energy spread below 0.2 % is necessary for appropriate resolution of the heavy ion ToF-ERDA.
* J. Julin and T. Sajavaara, Nucl. Instrum. Methods Phys. Res. B 406, Part A, (2017), pp 61-65.
** T. Kalvas, O. Tarvainen, V. Toivanen and H. Koivisto, 2020 JINST 15 P06016.

Slides MOXZO02 [10.204 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-MOXZO02

About •

Received ※ 25 September 2020 — Revised ※ 28 September 2020 — Accepted ※ 14 December 2020 — Issue date ※ 18 May 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

simulation, acceleration, electron, collider

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)