ECRIS2020 - List of Keywords (space-charge)

Paper	Title	Other Keywords	Page
TUZZO05	Multi-Species Child-Langmuir Law with Application to ECR Ion Sources	ECR, extraction, ion-source, target	106
	C.Y. Wong ORNL, Oak Ridge, Tennessee, USA S.M. Lund FRIB, East Lansing, Michigan, USA
	We generalize the classical single-species Child-Langmuir Law to analyze multi-species beams from ECR ion sources. The formulation assumes the relative weight of each species in the extracted beam is known. We apply the results to charge state distribution data from Artemis- and Venus-type sources at the NSCL and LBNL respectively. The total measured beam current is close to the maximum current predicted by the multi-species Child Langmuir law in each case, which indicates that beam extraction occurs close to space-charge-limited flow conditions. Prospects for application of the results and further studies on the topic are outlined.
	Slides TUZZO05 [0.508 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO05
About •	Received ※ 28 September 2020 — Revised ※ 28 December 2020 — Accepted ※ 16 January 2021 — Issue date ※ 18 May 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	electron, cathode, simulation, gun	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)

Paper

Title

Other Keywords

Page

TUZZO05

Multi-Species Child-Langmuir Law with Application to ECR Ion Sources

ECR, extraction, ion-source, target

106

C.Y. Wong
ORNL, Oak Ridge, Tennessee, USA
S.M. Lund
FRIB, East Lansing, Michigan, USA

We generalize the classical single-species Child-Langmuir Law to analyze multi-species beams from ECR ion sources. The formulation assumes the relative weight of each species in the extracted beam is known. We apply the results to charge state distribution data from Artemis- and Venus-type sources at the NSCL and LBNL respectively. The total measured beam current is close to the maximum current predicted by the multi-species Child Langmuir law in each case, which indicates that beam extraction occurs close to space-charge-limited flow conditions. Prospects for application of the results and further studies on the topic are outlined.

Slides TUZZO05 [0.508 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUZZO05

About •

Received ※ 28 September 2020 — Revised ※ 28 December 2020 — Accepted ※ 16 January 2021 — Issue date ※ 18 May 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

electron, cathode, simulation, gun

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)