ECRIS2016 - List of Authors (Zhao, H.W.)

Paper	Title	Page
MOBO01	FECRAL - a 45 GHz Fourth Generation ECR Ion Source and Its Technical Challenge
	H.W. Zhao, L.T. Sun IMP/CAS, Lanzhou, People's Republic of China
	A 45 GHz superconducting ECR ion source FECRAL (a Fourth generation ECR ion source with Advanced design in Lanzhou) is going to be built in the next few years as a key technology R&D of HIAF facility. HIAF injector of a superconducting heavy ion linac requests the ion source of delivering 50 pμA of 238U³⁵⁺ pulsed beam and 25 pμA of 238U³⁵⁺ CW beam. This presentation will present preliminary technical-design of FECRAL ECR ion source including magnetic field configuration produced by a Nb3Sn superconducting magnet with 6.5 Tesla axial mirror field and 3.5 Tesla sextupole field on the plasma chamber inner wall, 20 kW@45 GHz microwave coupling system and beam transport line. Obviously, to build a 45 GHz FECRAL ECR ion source, there will be many technical challenges, such as engineering and fabrication of the Nb3Sn superconducting magnet with 12 Tesla maximum magnetic field on the conductor, cryogenic system of the magnet, efficient coupling of 45 GHz microwave power, intense beam extraction and transmission to achieve good beam quality, integration of the FECRAL ion source system and analyzing beam line at a high voltage platform.
	Slides MOBO01 [7.596 MB]
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TUAO04	SECRAL II Ion Source Development and the First Commissioning at 28 GHz	43
	L.T. Sun, X. Fang, Y.C. Feng, J.W. Guo, H.Y. Ma, L.Z. Ma, Y.M. Ma, Z. Shen, W. Wu, T. Yang, Y. Yang, W.H. Zhang, X.Z. Zhang, B. Zhao, H.W. Zhao IMP/CAS, Lanzhou, People's Republic of China
	SECRAL II ion source has been successfully designed and developed at IMP. This ion source is a 3rd generation ECR machine optimized for the operation at 28 GHz. As a second superconducting ECR ion source developed at IMP with the identical coldmass design as SECRAL ion source, which has the sextupole coils external to the axial solenoids, the magnet performance is more robust according the training test. After a short time beam test at 18 GHz, SECRAL II has been commissioned at 28 GHz, and some preliminary results have been achieved with high charge state ion beam production. This paper will present the magnet design and test results. The first beam at 28 GHz will also be given.
	Slides TUAO04 [8.218 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-TUAO04
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WECO03	Transverse Coupling of Ion Beams From an RCR Ion Source	76
	Y. Yang, Y. Liu, L.T. Sun, Y.J. Yuan, H.W. Zhao IMP/CAS, Lanzhou, People's Republic of China
	ECR ion source beam quality will deteriorate under the influence of beam transverse coupling and high-order magnetic field aberration. Ion beams from an ECR ion source will experience a descending axial magnetic field at the extraction region, leading to a strong transverse coupling to the extracted beam, with projection emittance growth both in horizontal and vertical and two eigen emittances separation. On the other hand, sextupole field in the ECR and the sextupole component in the analyzing dipole can also degrade the beam quality by resulting in beam distortion. Proper adjusting of the extraction field strength of the ion source and the pre-focusing solenoid field can help to weaken the correlation in the inter-plane phase spaces and reduce the projection emittances. Another approach to improve the beam quality is to compensate for the high-order magnetic fields. This paper presents the property of beam coupling in the transverse phase space by analytical theory and simulations. Some experimental results are also presented and discussed. In addition, a high-order compensation scheme is displayed, whose feasibility has been verified by preliminary tests with SECRAL at IMP.
	Slides WECO03 [5.500 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WECO03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

MOBO01

FECRAL - a 45 GHz Fourth Generation ECR Ion Source and Its Technical Challenge

H.W. Zhao, L.T. Sun
IMP/CAS, Lanzhou, People's Republic of China

A 45 GHz superconducting ECR ion source FECRAL (a Fourth generation ECR ion source with Advanced design in Lanzhou) is going to be built in the next few years as a key technology R&D of HIAF facility. HIAF injector of a superconducting heavy ion linac requests the ion source of delivering 50 pμA of 238U³⁵⁺ pulsed beam and 25 pμA of 238U³⁵⁺ CW beam. This presentation will present preliminary technical-design of FECRAL ECR ion source including magnetic field configuration produced by a Nb3Sn superconducting magnet with 6.5 Tesla axial mirror field and 3.5 Tesla sextupole field on the plasma chamber inner wall, 20 kW@45 GHz microwave coupling system and beam transport line. Obviously, to build a 45 GHz FECRAL ECR ion source, there will be many technical challenges, such as engineering and fabrication of the Nb3Sn superconducting magnet with 12 Tesla maximum magnetic field on the conductor, cryogenic system of the magnet, efficient coupling of 45 GHz microwave power, intense beam extraction and transmission to achieve good beam quality, integration of the FECRAL ion source system and analyzing beam line at a high voltage platform.

Slides MOBO01 [7.596 MB]

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

TUAO04

SECRAL II Ion Source Development and the First Commissioning at 28 GHz

43

L.T. Sun, X. Fang, Y.C. Feng, J.W. Guo, H.Y. Ma, L.Z. Ma, Y.M. Ma, Z. Shen, W. Wu, T. Yang, Y. Yang, W.H. Zhang, X.Z. Zhang, B. Zhao, H.W. Zhao
IMP/CAS, Lanzhou, People's Republic of China

SECRAL II ion source has been successfully designed and developed at IMP. This ion source is a 3rd generation ECR machine optimized for the operation at 28 GHz. As a second superconducting ECR ion source developed at IMP with the identical coldmass design as SECRAL ion source, which has the sextupole coils external to the axial solenoids, the magnet performance is more robust according the training test. After a short time beam test at 18 GHz, SECRAL II has been commissioned at 28 GHz, and some preliminary results have been achieved with high charge state ion beam production. This paper will present the magnet design and test results. The first beam at 28 GHz will also be given.

Slides TUAO04 [8.218 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-TUAO04

Export •

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

WECO03

Transverse Coupling of Ion Beams From an RCR Ion Source

76

Y. Yang, Y. Liu, L.T. Sun, Y.J. Yuan, H.W. Zhao
IMP/CAS, Lanzhou, People's Republic of China

ECR ion source beam quality will deteriorate under the influence of beam transverse coupling and high-order magnetic field aberration. Ion beams from an ECR ion source will experience a descending axial magnetic field at the extraction region, leading to a strong transverse coupling to the extracted beam, with projection emittance growth both in horizontal and vertical and two eigen emittances separation. On the other hand, sextupole field in the ECR and the sextupole component in the analyzing dipole can also degrade the beam quality by resulting in beam distortion. Proper adjusting of the extraction field strength of the ion source and the pre-focusing solenoid field can help to weaken the correlation in the inter-plane phase spaces and reduce the projection emittances. Another approach to improve the beam quality is to compensate for the high-order magnetic fields. This paper presents the property of beam coupling in the transverse phase space by analytical theory and simulations. Some experimental results are also presented and discussed. In addition, a high-order compensation scheme is displayed, whose feasibility has been verified by preliminary tests with SECRAL at IMP.

Slides WECO03 [5.500 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2016-WECO03

Export •

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