IPAC2016 - List of Authors (Barth, W.A.)

Paper	Title	Page
MOPOY019	Status of the First CH-Cavities for the New Superconducting CW Heavy Ion LINAC@GSI	886
SUPSS043	use link to see paper's listing under its alternate paper code
	M. Basten, M. Amberg, M. Busch, F.D. Dziuba, H. Podlech, M. Schwarz IAP, Frankfurt am Main, Germany K. Aulenbacher IKP, Mainz, Germany K. Aulenbacher, W.A. Barth, V. Gettmann, S. Mickat, M. Miski-Oglu HIM, Mainz, Germany W.A. Barth, M. Heilmann, S. Mickat, S. Yaramyshev GSI, Darmstadt, Germany
	In the field of Super Heavy Elements (SHE) a superconducting (sc) continuous wave (cw) high intensity heavy ion LINAC is highly desirable. Currently a multi-stage R&D program conducted by GSI, HIM and IAP* is in progress. The baseline linac design composes a high performance ion source, a new low energy beam transport line, a (cw) upgraded High Charge State Injector (HLI), and a matching line (1.4 MeV/u) followed by the new sc-DTL LINAC for acceleration up to 7.3 MeV/u. The commissioning of the first CH cavity (Demonstrator), in a horizontal cryo module with beam is a major milestone in 2016*. The advanced demonstrator comprises constant-beta sc Crossbar-H-mode (CH) cavities operated at 217 MHz. Presently, the first two sc CH cavities of the advanced demonstrator are under construction at Research Instruments (RI), Bergisch Gladbach, Germany. A string of cavities and focusing elements build from several short CH-cavities with 8 gaps, without girders is recommended. The new design potentially reduces the overall technical risks during the fabrication and the pressure sensitivity through stiffening brackets. The present status of the first two sc cavities will be presented. W.Barth et al., Further R&D for a new Superconducting cw Heavy Ion LINAC@GSI, IPAC'14 **F.Dziuba et al., Measurements on the Superconducting 217 MHz CH Cavity during the Manufacturing Phase, SRF2015
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY019
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MOPOY022	Further Upgrade Measures at New GSI cw-Linac Demonstrator Setup	892
	M. Heilmann, W.A. Barth, S. Mickat, S. Yaramyshev GSI, Darmstadt, Germany M. Amberg, M. Basten, F.D. Dziuba, H. Podlech, U. Ratzinger, M. Schwarz IAP, Frankfurt am Main, Germany K. Aulenbacher IKP, Mainz, Germany K. Aulenbacher, W.A. Barth, V. Gettmann, S. Mickat, M. Miski-Oglu HIM, Mainz, Germany
	A new continuous wave (cw) linac is required to deliver high intensity heavy ion beams for Super Heavy Element (SHE) future experiments at GSI Darmstadt, Germany. The presented upgrade measures are dedicated to improve the performance of the cw demonstrator setup. The key component is a cryomodule comprising a superconducting (sc) 217 MHz Crossbar-H-mode (CH) cavity surrounded by two sc 9.3T solenoids with compensation coils. The solenoid coil is made of a Nb3Sn wire; and the compensation coils at both ends of the solenoid comprises NbTi wires. The distance between solenoid lense and CH cavity has to be optimized for ideal beam matching as well as for a minimum rest field inside the cavity below the critical magnetic field. The GSI High Charge State (HLI) injector has to deliver a heavy ion beam with an energy of 1.4 MeV/u. Longitudinal matching to the demonstrator is provided by two 10⁸.4 MHz cw room temperature λ/4 re-buncher cavity installed behind the HLI. In this paper electromagnetic simulations of the field optimization for the solenoids and the re-buncher cavities will be presented as well as first beam experiments at the beam transport line to the demonstrator cavity.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY022
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MOPOY023	Further Steps Towards the Superconducting CW-LINAC for Heavy Ions at GSI	896
	M. Schwarz, M. Basten, M. Busch, F.D. Dziuba, H. Podlech, U. Ratzinger, R. Tiede IAP, Frankfurt am Main, Germany W.A. Barth, V. Gettmann, M. Heilmann, S. Mickat, M. Miski-Oglu, S. Yaramyshev GSI, Darmstadt, Germany W.A. Barth, V. Gettmann, S. Mickat, M. Miski-Oglu HIM, Mainz, Germany
	Funding: Work supported by BMBF contr. No. 05P15RFRBA For future experiments with heavy ions near the coulomb barrier within the super-heavy element (SHE) research project a multi-stage R&D program of GSI, HIM and IAP is currently in progress. It aims at developing a superconducting (sc) continuous wave (cw) LINAC with multiple CH cavities as key components downstream the upgraded High Charge Injector (HLI) at GSI. The LINAC design is challenging, due to the requirement of intense beams in cw-mode up to a mass-to-charge-ratio of 6 while covering a broad output energy range from 3.5 to 7.3 MeV/u with minimum energy spread. The next milestone will be a full performance beam test of the first expansion stage at GSI, the Demonstrator, comprising two solenoids and a 15-gap CH cavity inside a cryostat.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY023
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TUPMR057	High Current Proton and Carbon Beam Operation via Stripping of a Molecular Beam at GSI UNILAC	1390
	M. Heilmann, A. Adonin, W.A. Barth, Ch.E. Düllmann, R. Hollinger, E. Jäger, P. Scharrer, W. Vinzenz, H. Vormann GSI, Darmstadt, Germany W.A. Barth, Ch.E. Düllmann, P. Scharrer HIM, Mainz, Germany Ch.E. Düllmann Johannes Gutenberg University Mainz, Institut of Nuclear Chemistry, Mainz, Germany P. Scharrer Mainz University, Mainz, Germany
	The experimental program of the future facility for Antiproton and Ion Research (FAIR) project requires a high number of cooled anti-protons per hour. The FAIR proton injector linac has to deliver a 70 MeV, 35 mA pulsed proton beam at a repetition rate of 4 Hz. During recent machine investigations at the GSI a high current proton beam was achieved in the Universal Lineral Accelerator (UNILAC). In preparation for this the ion source was equipped with a newly developed 7-hole extraction system and optimized for single charged hydrocarbon beam (isobutane gas) operation. This beam was accelerated to 1.4 MeV/u and cracked in a new pulsed gas stripper into protons and charged carbon. The new stripper setup injects high density gas pulses synchronous with the transit of the beam pulse close to the beam trajectory. With this setup a proton (up to 4.3 mA) as well a carbon beam (up to 9.5 mA) intensity record at beam energy of 1.4 MeV was achieved. The proton beam was accelerated up to 3.6 MeV/u inside the first Alvarez-section with full transmission. The paper will present beam measurement in comparison to the former beam investigations using a 2 mA proton beam in the entire UNILAC.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR057
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TUPMR058	An Upgrade for the 1.4 MeV/u Gas Stripper at the GSI UNILAC	1394
	P. Scharrer, W.A. Barth, Ch.E. Düllmann, J. Khuyagbaatar, A. Yakushev HIM, Mainz, Germany W.A. Barth, M. Bevcic, Ch.E. Düllmann, L. Groening, K.P. Horn, E. Jäger, J. Khuyagbaatar, J. Krier, P. Scharrer, A. Yakushev GSI, Darmstadt, Germany Ch.E. Düllmann Johannes Gutenberg University Mainz, Institut of Nuclear Chemistry, Mainz, Germany P. Scharrer Mainz University, Mainz, Germany
	The GSI UNILAC will serve as part of an injector system for the future FAIR facility, currently under construction in Darmstadt, Germany. For this, it has to deliver short-pulsed, high-current, heavy-ion beams with highest beam quality. An upgrade for the 1.4 MeV/u gas stripper is ongoing to increase the yield of uranium ions in the desired charge state. The new setup features a pulsed gas injection synchronized with the beam pulse transit to increase the effective density of the stripper target while keeping the gas load for the differential pumping system low. Systematic measurements of charge state distributions and energy-loss were conducted with 238U-ion beams and different stripper gases, including H2 and He. By using H2 as a stripper gas, the yield into the most populated charge state was increased by over 50%, compared to the current stripper. Furthermore, the high gas density, enabled by the pulsed injection, results in increased mean charge states.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR058
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WEOBA03	High Brilliance Uranium Beams for FAIR	2052
	W.A. Barth, A. Adonin, Ch.E. Düllmann, M. Heilmann, R. Hollinger, E. Jäger, O.K. Kester, J. Khuyagbaatar, J. Krier, E. Plechov, P. Scharrer, W. Vinzenz, H. Vormann, A. Yakushev, S. Yaramyshev GSI, Darmstadt, Germany Ch.E. Düllmann, J. Khuyagbaatar, P. Scharrer, A. Yakushev HIM, Mainz, Germany Ch.E. Düllmann Johannes Gutenberg University Mainz, Institut of Nuclear Chemistry, Mainz, Germany P. Scharrer Mainz University, Mainz, Germany
	The 40 years old GSI-UNILAC (Universal Linear Accelerator) as well as the heavy ion synchrotron SIS18 will serve as a high current heavy ion injector for the new FAIR (Facility for Antiproton and Ion Research) synchrotron SIS100. Due to an advanced machine investigation program in combination with the ongoing UNILAC upgrade program, a new uranium beam intensity record (10 emA, U²⁹⁺) at very high beam brilliance was achieved recently in a machine experiment campaign. This is an important step paving the way to fulfill the FAIR heavy ion high intensity beam requirements. Results of high current uranium beam measurements applying a newly developed pulsed hydrogen gas stripper (at 1.4 MeV/u) will be presented in detail.
	Slides WEOBA03 [2.281 MB]
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOBA03
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Paper

Title

Page

MOPOY019

Status of the First CH-Cavities for the New Superconducting CW Heavy Ion LINAC@GSI

886

SUPSS043

use link to see paper's listing under its alternate paper code

M. Basten, M. Amberg, M. Busch, F.D. Dziuba, H. Podlech, M. Schwarz
IAP, Frankfurt am Main, Germany
K. Aulenbacher
IKP, Mainz, Germany
K. Aulenbacher, W.A. Barth, V. Gettmann, S. Mickat, M. Miski-Oglu
HIM, Mainz, Germany
W.A. Barth, M. Heilmann, S. Mickat, S. Yaramyshev
GSI, Darmstadt, Germany

In the field of Super Heavy Elements (SHE) a superconducting (sc) continuous wave (cw) high intensity heavy ion LINAC is highly desirable. Currently a multi-stage R&D program conducted by GSI, HIM and IAP* is in progress. The baseline linac design composes a high performance ion source, a new low energy beam transport line, a (cw) upgraded High Charge State Injector (HLI), and a matching line (1.4 MeV/u) followed by the new sc-DTL LINAC for acceleration up to 7.3 MeV/u. The commissioning of the first CH cavity (Demonstrator), in a horizontal cryo module with beam is a major milestone in 2016**. The advanced demonstrator comprises constant-beta sc Crossbar-H-mode (CH) cavities operated at 217 MHz. Presently, the first two sc CH cavities of the advanced demonstrator are under construction at Research Instruments (RI), Bergisch Gladbach, Germany. A string of cavities and focusing elements build from several short CH-cavities with 8 gaps, without girders is recommended. The new design potentially reduces the overall technical risks during the fabrication and the pressure sensitivity through stiffening brackets. The present status of the first two sc cavities will be presented.
* W.Barth et al., Further R&D for a new Superconducting cw Heavy Ion LINAC@GSI, IPAC'14
**F.Dziuba et al., Measurements on the Superconducting 217 MHz CH Cavity during the Manufacturing Phase, SRF2015

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY019

Export •

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

MOPOY022

Further Upgrade Measures at New GSI cw-Linac Demonstrator Setup

892

M. Heilmann, W.A. Barth, S. Mickat, S. Yaramyshev
GSI, Darmstadt, Germany
M. Amberg, M. Basten, F.D. Dziuba, H. Podlech, U. Ratzinger, M. Schwarz
IAP, Frankfurt am Main, Germany
K. Aulenbacher
IKP, Mainz, Germany
K. Aulenbacher, W.A. Barth, V. Gettmann, S. Mickat, M. Miski-Oglu
HIM, Mainz, Germany

A new continuous wave (cw) linac is required to deliver high intensity heavy ion beams for Super Heavy Element (SHE) future experiments at GSI Darmstadt, Germany. The presented upgrade measures are dedicated to improve the performance of the cw demonstrator setup. The key component is a cryomodule comprising a superconducting (sc) 217 MHz Crossbar-H-mode (CH) cavity surrounded by two sc 9.3T solenoids with compensation coils. The solenoid coil is made of a Nb3Sn wire; and the compensation coils at both ends of the solenoid comprises NbTi wires. The distance between solenoid lense and CH cavity has to be optimized for ideal beam matching as well as for a minimum rest field inside the cavity below the critical magnetic field. The GSI High Charge State (HLI) injector has to deliver a heavy ion beam with an energy of 1.4 MeV/u. Longitudinal matching to the demonstrator is provided by two 10⁸.4 MHz cw room temperature λ/4 re-buncher cavity installed behind the HLI. In this paper electromagnetic simulations of the field optimization for the solenoids and the re-buncher cavities will be presented as well as first beam experiments at the beam transport line to the demonstrator cavity.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY022

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

MOPOY023

Further Steps Towards the Superconducting CW-LINAC for Heavy Ions at GSI

896

M. Schwarz, M. Basten, M. Busch, F.D. Dziuba, H. Podlech, U. Ratzinger, R. Tiede
IAP, Frankfurt am Main, Germany
W.A. Barth, V. Gettmann, M. Heilmann, S. Mickat, M. Miski-Oglu, S. Yaramyshev
GSI, Darmstadt, Germany
W.A. Barth, V. Gettmann, S. Mickat, M. Miski-Oglu
HIM, Mainz, Germany

Funding: Work supported by BMBF contr. No. 05P15RFRBA
For future experiments with heavy ions near the coulomb barrier within the super-heavy element (SHE) research project a multi-stage R&D program of GSI, HIM and IAP is currently in progress. It aims at developing a superconducting (sc) continuous wave (cw) LINAC with multiple CH cavities as key components downstream the upgraded High Charge Injector (HLI) at GSI. The LINAC design is challenging, due to the requirement of intense beams in cw-mode up to a mass-to-charge-ratio of 6 while covering a broad output energy range from 3.5 to 7.3 MeV/u with minimum energy spread. The next milestone will be a full performance beam test of the first expansion stage at GSI, the Demonstrator, comprising two solenoids and a 15-gap CH cavity inside a cryostat.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOY023

Export •

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

TUPMR057

High Current Proton and Carbon Beam Operation via Stripping of a Molecular Beam at GSI UNILAC

1390

M. Heilmann, A. Adonin, W.A. Barth, Ch.E. Düllmann, R. Hollinger, E. Jäger, P. Scharrer, W. Vinzenz, H. Vormann
GSI, Darmstadt, Germany
W.A. Barth, Ch.E. Düllmann, P. Scharrer
HIM, Mainz, Germany
Ch.E. Düllmann
Johannes Gutenberg University Mainz, Institut of Nuclear Chemistry, Mainz, Germany
P. Scharrer
Mainz University, Mainz, Germany

The experimental program of the future facility for Antiproton and Ion Research (FAIR) project requires a high number of cooled anti-protons per hour. The FAIR proton injector linac has to deliver a 70 MeV, 35 mA pulsed proton beam at a repetition rate of 4 Hz. During recent machine investigations at the GSI a high current proton beam was achieved in the Universal Lineral Accelerator (UNILAC). In preparation for this the ion source was equipped with a newly developed 7-hole extraction system and optimized for single charged hydrocarbon beam (isobutane gas) operation. This beam was accelerated to 1.4 MeV/u and cracked in a new pulsed gas stripper into protons and charged carbon. The new stripper setup injects high density gas pulses synchronous with the transit of the beam pulse close to the beam trajectory. With this setup a proton (up to 4.3 mA) as well a carbon beam (up to 9.5 mA) intensity record at beam energy of 1.4 MeV was achieved. The proton beam was accelerated up to 3.6 MeV/u inside the first Alvarez-section with full transmission. The paper will present beam measurement in comparison to the former beam investigations using a 2 mA proton beam in the entire UNILAC.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR057

Export •

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

TUPMR058

An Upgrade for the 1.4 MeV/u Gas Stripper at the GSI UNILAC

1394

P. Scharrer, W.A. Barth, Ch.E. Düllmann, J. Khuyagbaatar, A. Yakushev
HIM, Mainz, Germany
W.A. Barth, M. Bevcic, Ch.E. Düllmann, L. Groening, K.P. Horn, E. Jäger, J. Khuyagbaatar, J. Krier, P. Scharrer, A. Yakushev
GSI, Darmstadt, Germany
Ch.E. Düllmann
Johannes Gutenberg University Mainz, Institut of Nuclear Chemistry, Mainz, Germany
P. Scharrer
Mainz University, Mainz, Germany

The GSI UNILAC will serve as part of an injector system for the future FAIR facility, currently under construction in Darmstadt, Germany. For this, it has to deliver short-pulsed, high-current, heavy-ion beams with highest beam quality. An upgrade for the 1.4 MeV/u gas stripper is ongoing to increase the yield of uranium ions in the desired charge state. The new setup features a pulsed gas injection synchronized with the beam pulse transit to increase the effective density of the stripper target while keeping the gas load for the differential pumping system low. Systematic measurements of charge state distributions and energy-loss were conducted with 238U-ion beams and different stripper gases, including H2 and He. By using H2 as a stripper gas, the yield into the most populated charge state was increased by over 50%, compared to the current stripper. Furthermore, the high gas density, enabled by the pulsed injection, results in increased mean charge states.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR058

Export •

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

WEOBA03

High Brilliance Uranium Beams for FAIR

2052

W.A. Barth, A. Adonin, Ch.E. Düllmann, M. Heilmann, R. Hollinger, E. Jäger, O.K. Kester, J. Khuyagbaatar, J. Krier, E. Plechov, P. Scharrer, W. Vinzenz, H. Vormann, A. Yakushev, S. Yaramyshev
GSI, Darmstadt, Germany
Ch.E. Düllmann, J. Khuyagbaatar, P. Scharrer, A. Yakushev
HIM, Mainz, Germany
Ch.E. Düllmann
Johannes Gutenberg University Mainz, Institut of Nuclear Chemistry, Mainz, Germany
P. Scharrer
Mainz University, Mainz, Germany

The 40 years old GSI-UNILAC (Universal Linear Accelerator) as well as the heavy ion synchrotron SIS18 will serve as a high current heavy ion injector for the new FAIR (Facility for Antiproton and Ion Research) synchrotron SIS100. Due to an advanced machine investigation program in combination with the ongoing UNILAC upgrade program, a new uranium beam intensity record (10 emA, U²⁹⁺) at very high beam brilliance was achieved recently in a machine experiment campaign. This is an important step paving the way to fulfill the FAIR heavy ion high intensity beam requirements. Results of high current uranium beam measurements applying a newly developed pulsed hydrogen gas stripper (at 1.4 MeV/u) will be presented in detail.

Slides WEOBA03 [2.281 MB]

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEOBA03

Export •

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