HIAT2022 - List of Keywords (electron)

Paper	Title	Other Keywords	Page
MO1C3	High Voltage Upgrade of the 14UD Tandem Accelerator	simulation, heavy-ion, operation, acceleration	1
	T.B. Tunningley, S.T. Battisson, A. Cooper, J.K. Heighway, D.J. Hinde, C. Kafer, T. Kitchen, P. Linardakis, N.R. Lobanov, C. Notthoff, T. Tempra, B. Tranter, R. Tranter Research School of Physics and Engineering, Australian National University, Canberra, Australian Capitol Territory, Australia R.A. Bosch UW-Madison/SRC, Madison, Wisconsin, USA J.E. Raatz NEC, Middleton, Wisconsin, USA
	The 14UD at the Australian National University’s Heavy Ion Accelerator Facility (HIAF) operated at a maximum voltage of 15.5 MV after the installation of tubes with a compressed geometry in the 1990s. In recent years, the performance of the accelerator has shown a gradual decline to a maximum operation voltage of ~14.5 MV. There are some fundamental factors that limit the high voltage performance, such as SF6 gas pressure, field enhancement due to triple junctions and total voltage effect. In 2019 ANU initiated the feasibility study of available options to upgrade the entire population of supporting posts, acceleration tubes and grading resistors. In this paper we will discuss the preferred technologies and strategies for successful implementation of this development. The chosen design is based on NEC tubes with magnetic electron suppression and minimized steering of ion beam. The new grading resistors mounting options and improved voltage distribution along accelerator column timeline will be discussed.
	Slides MO1C3 [28.718 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-MO1C3
About •	Received ※ 25 May 2022 — Revised ※ 27 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MO2C3	Status and Perspective of Electron Cyclotron Resonance Based Charge Breeders	ECR, plasma, injection, ECRIS	6
	J. Angot, M.A. Baylac, M. Migliore, T. Thuillier LPSC, Grenoble Cedex, France O.A. Tarvainen STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	Since their invention in the late 1990s, Electron Cyclotron Resonance (ECR) based Charge Breeders (CB) have been used in several Isotope Separation On Line (ISOL) facilities to study radioactive ions. Many developments were carried out on these devices to enhance their performances and improve the knowledge on the ECR charge breeding process in laboratories worldwide. At LPSC, recent experiments in pulse mode were carried out to estimate plasma parameters such as the ionisation, charge exchange and confinement times, providing indications on the high charge state ions confinement. A new model of the 1+ beam capture was also proposed and experimentally verified by studying the stopping of injected ions of different masses. Present ECR charge breeder optimum efficiencies vary from 10 to 20% depending on the ion species and the facilities specifications. The total efficiency ranges from 35 to 90% and the charge breeding time from 10 to 25 ms/q. Electron Beam Ion Source (EBIS) is an alternate CB technology with lower contamination yield, yet limited injection flux capability. ECR CB sustains a higher 1+ beam intensity acceptance and its prospects to improve the efficiency, charge breeding time and beam purity are identified.
	Slides MO2C3 [1.969 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-MO2C3
About •	Received ※ 21 June 2022 — Revised ※ 30 June 2022 — Accepted ※ 01 July 2022 — Issue date ※ 10 August 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TU3C3	Preparation of Low-Energy Heavy Ion Beams in a Compact Linear Accelerator/Decelerator	experiment, injection, rfq, ion-source	63
	Z. Andelkovic, S. Fedotova, W. Geithner, P. Gerhard, F. Herfurth, I. Kraus, M.T. Maier, A. Reiter, G. Vorobyev GSI, Darmstadt, Germany N.S. Stallkamp IKF, Frankfurt am Main, Germany
	High precision tests of fundamental theories can often unfold their full potential only by using highly charged ions (HCI) at very low energies. Although in light of the envisaged energies at FAIR, experiments in the keV to MeV range may sound like backpedaling, these two techniques are in fact complementary, since the production of heavy HCI is virtually impossible without prior acceleration and electron stripping. However, subsequent preparation, transport, storage and detection of low-energy HCI bring new, surprising sets of problems and limitations. Here we will give an overview of the CRYRING@ESR local injector and the HITRAP linear decelerator. These two facilities consist out of one or two accelerator or decelerator stages, with a total length of around 10 meters, making them "compact" in comparison to other GSI accelerators. The following sections describe their main design parameters, the achieved ion numbers, challenges of beam detection, as well as some special features such as multi-turn injection and single-shot energy analyzers. The conclusion will present the current status and will also give an outlook of the planned applications of low-energy ions at the FAIR facility.
	Slides TU3C3 [3.244 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TU3C3
About •	Received ※ 20 June 2022 — Revised ※ 01 July 2022 — Accepted ※ 01 July 2022 — Issue date ※ 10 August 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH2I2	Longitudinal Beam Diagnostics R&D at GSI-UNILAC	radiation, target, detector, diagnostics	144
	R. Singh GSI, Darmstadt, Germany
	GSI UNILAC provides a wide variety of ion types from energies ranging from 1.4 MeV/u to ~11.5 MeV/u with a large dynamic range in the beam intensities to the experimental users or to the downstream accelerators. This flexibility in beam parameters requires a frequent tuning of the machine parameters for optimal operation of the UNILAC. Therefore, there has been a constant and pressing need for operationally convenient, accurate, fast and potentially non-destructive beam diagnostics for longitudinal charge profile and energy distribution. This contribution discusses the recent progress on longitudinal charge profile distribution measurements at GSI UNILAC. The outcome of recent devices like Fast Faraday cups (FFCs), transition radiation in GHz regime (GTR) is shown in comparison with phase probes or pick-ups. Other past developments aimed at longitudinal diagnostics at UNILAC like single particle detectors and RF deflector type methods are also briefly discussed.
	Slides TH2I2 [5.011 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH2I2
About •	Received ※ 07 July 2022 — Revised ※ 20 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH2C4	Signal Estimation and Analyzing of Cold Button BPMs for a Low-Beta Helium/Proton Superconducting Linac	proton, linac, MMI, electronics	150
	Y. Zhang, X.J. Hu, H. Jia, Z.X. Li, S.H. Liu, H.M. Xie IMP/CAS, Lanzhou, People’s Republic of China
	Funding: This work was supported by National Natural Science Foundation of China (Grant No. 11675237) and the 2018 ’Western Light’ Talents Training Program of Chinese Academy of Sciences. We develop a formula including the low-beta effect and the influence of long cable issues for estimating the original signal of cold BPMs. A good agreement between the numerical and the measured signal with regard to two kinds of beam commissioning, helium and proton beams, in a low-beta helium and proton superconducting linac, proves that the developed numerical model could accurately estimate the output signal of cold button BPMs. Analysing the original signal between the first and the last cold BPM in the cryomodule, it is found that the signal voltage in the time domain is increased with the accelerated beam energy. However, the amplitude spectra in the frequency domain has more high frequency Fourier components and the amplitude at the first harmonic frequency reduces a lot. It results in a decline of the summed value from the BPM electronics. The decline is not proportional to a variety of the beam intensity. This is the reason why BPMs give only relative intensity and not absolute value for low-beta beams with a Gaussian distribution.
	Slides TH2C4 [6.197 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH2C4
About •	Received ※ 14 June 2022 — Revised ※ 10 August 2022 — Accepted ※ 28 September 2022 — Issue date ※ 29 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MO1C3

High Voltage Upgrade of the 14UD Tandem Accelerator

simulation, heavy-ion, operation, acceleration

1

T.B. Tunningley, S.T. Battisson, A. Cooper, J.K. Heighway, D.J. Hinde, C. Kafer, T. Kitchen, P. Linardakis, N.R. Lobanov, C. Notthoff, T. Tempra, B. Tranter, R. Tranter
Research School of Physics and Engineering, Australian National University, Canberra, Australian Capitol Territory, Australia
R.A. Bosch
UW-Madison/SRC, Madison, Wisconsin, USA
J.E. Raatz
NEC, Middleton, Wisconsin, USA

The 14UD at the Australian National University’s Heavy Ion Accelerator Facility (HIAF) operated at a maximum voltage of 15.5 MV after the installation of tubes with a compressed geometry in the 1990s. In recent years, the performance of the accelerator has shown a gradual decline to a maximum operation voltage of ~14.5 MV. There are some fundamental factors that limit the high voltage performance, such as SF6 gas pressure, field enhancement due to triple junctions and total voltage effect. In 2019 ANU initiated the feasibility study of available options to upgrade the entire population of supporting posts, acceleration tubes and grading resistors. In this paper we will discuss the preferred technologies and strategies for successful implementation of this development. The chosen design is based on NEC tubes with magnetic electron suppression and minimized steering of ion beam. The new grading resistors mounting options and improved voltage distribution along accelerator column timeline will be discussed.

Slides MO1C3 [28.718 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-MO1C3

About •

Received ※ 25 May 2022 — Revised ※ 27 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022

Cite •

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

MO2C3

Status and Perspective of Electron Cyclotron Resonance Based Charge Breeders

ECR, plasma, injection, ECRIS

6

J. Angot, M.A. Baylac, M. Migliore, T. Thuillier
LPSC, Grenoble Cedex, France
O.A. Tarvainen
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

Since their invention in the late 1990s, Electron Cyclotron Resonance (ECR) based Charge Breeders (CB) have been used in several Isotope Separation On Line (ISOL) facilities to study radioactive ions. Many developments were carried out on these devices to enhance their performances and improve the knowledge on the ECR charge breeding process in laboratories worldwide. At LPSC, recent experiments in pulse mode were carried out to estimate plasma parameters such as the ionisation, charge exchange and confinement times, providing indications on the high charge state ions confinement. A new model of the 1+ beam capture was also proposed and experimentally verified by studying the stopping of injected ions of different masses. Present ECR charge breeder optimum efficiencies vary from 10 to 20% depending on the ion species and the facilities specifications. The total efficiency ranges from 35 to 90% and the charge breeding time from 10 to 25 ms/q. Electron Beam Ion Source (EBIS) is an alternate CB technology with lower contamination yield, yet limited injection flux capability. ECR CB sustains a higher 1+ beam intensity acceptance and its prospects to improve the efficiency, charge breeding time and beam purity are identified.

Slides MO2C3 [1.969 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-MO2C3

About •

Received ※ 21 June 2022 — Revised ※ 30 June 2022 — Accepted ※ 01 July 2022 — Issue date ※ 10 August 2022

Cite •

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

TU3C3

Preparation of Low-Energy Heavy Ion Beams in a Compact Linear Accelerator/Decelerator

experiment, injection, rfq, ion-source

63

Z. Andelkovic, S. Fedotova, W. Geithner, P. Gerhard, F. Herfurth, I. Kraus, M.T. Maier, A. Reiter, G. Vorobyev
GSI, Darmstadt, Germany
N.S. Stallkamp
IKF, Frankfurt am Main, Germany

High precision tests of fundamental theories can often unfold their full potential only by using highly charged ions (HCI) at very low energies. Although in light of the envisaged energies at FAIR, experiments in the keV to MeV range may sound like backpedaling, these two techniques are in fact complementary, since the production of heavy HCI is virtually impossible without prior acceleration and electron stripping. However, subsequent preparation, transport, storage and detection of low-energy HCI bring new, surprising sets of problems and limitations. Here we will give an overview of the CRYRING@ESR local injector and the HITRAP linear decelerator. These two facilities consist out of one or two accelerator or decelerator stages, with a total length of around 10 meters, making them "compact" in comparison to other GSI accelerators. The following sections describe their main design parameters, the achieved ion numbers, challenges of beam detection, as well as some special features such as multi-turn injection and single-shot energy analyzers. The conclusion will present the current status and will also give an outlook of the planned applications of low-energy ions at the FAIR facility.

Slides TU3C3 [3.244 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TU3C3

About •

Received ※ 20 June 2022 — Revised ※ 01 July 2022 — Accepted ※ 01 July 2022 — Issue date ※ 10 August 2022

Cite •

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

TH2I2

Longitudinal Beam Diagnostics R&D at GSI-UNILAC

radiation, target, detector, diagnostics

144

R. Singh
GSI, Darmstadt, Germany

GSI UNILAC provides a wide variety of ion types from energies ranging from 1.4 MeV/u to ~11.5 MeV/u with a large dynamic range in the beam intensities to the experimental users or to the downstream accelerators. This flexibility in beam parameters requires a frequent tuning of the machine parameters for optimal operation of the UNILAC. Therefore, there has been a constant and pressing need for operationally convenient, accurate, fast and potentially non-destructive beam diagnostics for longitudinal charge profile and energy distribution. This contribution discusses the recent progress on longitudinal charge profile distribution measurements at GSI UNILAC. The outcome of recent devices like Fast Faraday cups (FFCs), transition radiation in GHz regime (GTR) is shown in comparison with phase probes or pick-ups. Other past developments aimed at longitudinal diagnostics at UNILAC like single particle detectors and RF deflector type methods are also briefly discussed.

Slides TH2I2 [5.011 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH2I2

About •

Received ※ 07 July 2022 — Revised ※ 20 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022

Cite •

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

TH2C4

Signal Estimation and Analyzing of Cold Button BPMs for a Low-Beta Helium/Proton Superconducting Linac

proton, linac, MMI, electronics

150

Y. Zhang, X.J. Hu, H. Jia, Z.X. Li, S.H. Liu, H.M. Xie
IMP/CAS, Lanzhou, People’s Republic of China

Funding: This work was supported by National Natural Science Foundation of China (Grant No. 11675237) and the 2018 ’Western Light’ Talents Training Program of Chinese Academy of Sciences.
We develop a formula including the low-beta effect and the influence of long cable issues for estimating the original signal of cold BPMs. A good agreement between the numerical and the measured signal with regard to two kinds of beam commissioning, helium and proton beams, in a low-beta helium and proton superconducting linac, proves that the developed numerical model could accurately estimate the output signal of cold button BPMs. Analysing the original signal between the first and the last cold BPM in the cryomodule, it is found that the signal voltage in the time domain is increased with the accelerated beam energy. However, the amplitude spectra in the frequency domain has more high frequency Fourier components and the amplitude at the first harmonic frequency reduces a lot. It results in a decline of the summed value from the BPM electronics. The decline is not proportional to a variety of the beam intensity. This is the reason why BPMs give only relative intensity and not absolute value for low-beta beams with a Gaussian distribution.

Slides TH2C4 [6.197 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH2C4

About •

Received ※ 14 June 2022 — Revised ※ 10 August 2022 — Accepted ※ 28 September 2022 — Issue date ※ 29 September 2022

Cite •

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