IPAC2017 - List of Authors (Spiller, P.J.)

Paper	Title	Page
TUPIK045	Closed Orbit Feedback for FAIR - Prototype Tests at SIS18	1784
	B.R. Schlei, H. Liebermann, D. Ondreka, P.J. Spiller, R.J. Steinhagen GSI, Darmstadt, Germany
	A new steering software for cycle-to-cycle closed orbit as well as trajectory control is currently under development for FAIR's planned control system. It has been successfully tested with beam at the SIS18 in 2016. COAT (i.e., Controlling Orbits And Trajectories) has been realized as a distributed, Java-based application. It consists of a background daemon process that handles the actual beam-based feedback logic, and independent clients that provide visualization and various user-interaction capabilities. Built on top of the LSA settings management system, code-shared and also used at CERN, the system is kept generic. Furthermore, it is designed to support multiple accelerators, transfer lines and users in parallel. In particular, it can handle continuously changing optics and other in advance known changing beam parameters. The COAT computer program is part of a set of newly developed beam-based feedback tools* for FAIR. Preliminary results of our proof-of-concept prototype studies indicate, e.g., in view of the observed SIS18 machine reproducibility, that such a cycle-to-cycle feedback control scheme may be adequate also for the other FAIR accelerators and transfer lines. *see separate contribution by R. J. Steinhagen et al.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK045
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TUPIK046	Beam-Based Feedbacks for FAIR - Prototyping at the SIS18	1787
	R.J. Steinhagen, J. Fitzek, H.C. Hüther, H. Liebermann, R. Müller, D. Ondreka, H. Reeg, B.R. Schlei, P.J. Spiller GSI, Darmstadt, Germany
	The 'Facility for Anti-Proton and Ion Research' (FAIR) presently under construction, extends and supersedes GSI's existing infrastructure. Its core challenges include the precise control of highest proton and uranium ion beam intensities, the required extreme high vacuum conditions, machine protection and activation issues while providing a high degree of multi-user mode of operation with facility reconfiguration on time-scales of a few times per week. To optimise turn-around times and to establish a safe and reliable machine operation, a comprehensive suite of semi-automated measurement applications, as well as fully-automated beam-based feedbacks will be deployed, covering the control of orbit, Q/Q', spill structure, optics, and other machine parameters. These systems are based on the LSA settings management framework, code-shared with and also used at CERN. The concepts, software architecture and first prototype beam tests at the SIS18 in 2016 are presented. As an initial proof-of-concept, a cycle-to-cycle orbit* and macro-spill feedback, as well as a semi-automated magnetic quadrupole- and sextupole-centre measurement tool have been selected. *results presented in separate contribution
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK046
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TUPVA056	Ionization Loss and Dynamic Vacuum in Heavy Ion Synchrotrons	2201
	L.H.J. Bozyk, P.J. Spiller GSI, Darmstadt, Germany
	Dynamic vacuum effects, induced by charge exchange processes and ion impact driven gas desorption, generate an intensity limitation for high intensity heavy ion synchrotrons. In order to reach ultimate heavy ion intensities, medium charge state heavy ions are used. The cross sections for charge exchange in collisions with residual gas molecules for such beams are much higher, than for highly charged heavy ion beams. Therefore high pumping power is required to obtain a very low static residual gas pressure and to suppress vacuum dynamics during operation. In modern heavy ion synchrotrons different techniques are employed: NEG-coating, cryogenic pumping, and low-desorption ion-catcher. The unique StrahlSim code allows the comparison of different design options for heavy ion synchrotrons. Different aspects of dynamic vacuum limitations are summarized, such as the dependence on different injection parameter. A comparison between a room temperature and a cryogenic synchrotron from the vacuum point of view is given.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA056
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TUPVA059	Overcoming the Space Charge Limit: Development of an Electron Lens for SIS18	2211
	D. Ondreka, P.J. Spiller GSI, Darmstadt, Germany P. Apse-Apsitis Riga Technical University, Riga, Latvia K. Schulte IAP, Frankfurt am Main, Germany
	The 'Facility for Anti-Proton and Ion Research' (FAIR) presently under construction will deliver intense ion beams to its experimental users. The requested intensities require filling the existing synchrotron SIS18, which serves as injector to FAIR, up to the space charge (SC) limit. Operation under these conditions is challenging due to the large tune footprint of the beam, demanding delicate control of adverse effects caused by machine imperfections to avoid emittance growth and beam loss. To facilitate the high intensity operation, the installation of an electron lens for SC compensation into SIS18 is foreseen. This requires an electron beam of a current of several amperes with longitudinal and transverse distributions matched to those of the ion beam during the cycle. The electron beam needs to be RF modulated at a bandwidth of a few MHz with time varying amplitude ranging from DC to fully modulated, while the transverse size needs to be continuously adapted to the adiabatically shrinking ion beam. This contribution reports on the requirements on an electron lens for SC compensation in SIS18.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA059
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WEOCB2	Superconducting Magnets at FAIR	2546
	E.S. Fischer, A. Bleile, J. Ceballos Velasco, V.I. Datskov, F. Kaether, J.P. Meier, A. Mierau, H. Müller, C. Roux, P.J. Spiller, K. Sugita GSI, Darmstadt, Germany
	For the FAIR (Facility of Antiproton and Ion Research) accelerators, various technologies of superconducting magnets have been developed. In total, 613 superconducting magnets are required for the FAIR modularized start version. For the heavy ion synchrotron SIS100, which is the central accelerator under construction, fast ramped, iron dominated superconducting magnets of the Nuclotron type will be used. Due to the high beam intensity operation desired for SIS100, highest precision and reproducibility is requested for the iron yoke of these magnets. For the dipole magnets of SIS100 the series production has already been released. In parallel, the Super-FRS will be built for the generation of radioactive beams and for isotope separation. Huge aperture superconducting dipole magnets and multiplet modules are required for the main separator of the Super-FRS. For testing of the various types of sc magnets, three test facilities at GSI, JINR and CERN have been set-up. We give an overview on the modern design aspects for the different magnet types and their first test results and the preparation of the appropriate test facilities.
	Slides WEOCB2 [12.633 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEOCB2
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WEPVA029	SIS100 Tunnel Design and Status	3316
	C. Omet, J. Falenski, G. Fehrenbacher, H. Kisker, K. Konradt, A. Sokolov, P.J. Spiller GSI, Darmstadt, Germany A. Fischer FAIR, Darmstadt, Germany
	As the FAIR project is proceeding, many of the building and tunnel designs in the meanwhile are frozen and documents are prepared for tendering. For the future FAIR driver accelerator, SIS100, the accelerator tunnel T110 comprises a 1100 m long tunnel, which has a depth of 17 m under ground. In this paper, its environmental boundary conditions, design principles and the finally chosen layout are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA029
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WEPVA030	FAIR SIS100 - Features and Status of Realisation	3320
	P.J. Spiller, U. Blell, L.H.J. Bozyk, T. Eisel, E.S. Fischer, J. Henschel, P. Hülsmann, H. Klingbeil, H.G. König, H. Kollmus, P. Kowina, J.P. Meier, A. Mierau, C. Mühle, C. Omet, D. Ondreka, V.P. Plyusnin, I. Pongrac, N. Pyka, P. Rottländer, C. Roux, J. Stadlmann, B. Streicher, St. Wilfert GSI, Darmstadt, Germany
	SIS100 is a unique heavy ion synchrotron designed for the generation of high intensity heavy ion and Proton beams. New features and solutions are implemented to enable operation with low charge state heavy ions and to minimize ionization beam loss driven by collisions with the residual gas. SIS100 aims for new frontier and world wide leading Uranium bam intensities. A huge effort is taken to stabilized the dynamics of the residual gas pressure and to suppress ion induced desorption. Fast ramped superconducting magnets have been developed and are in production with highest precision in engineering and field quality, matching the requirements from beams with high space charge. A powerful equipment with Rf stations for fast acceleration, pre- and final compression, for the generation of barrier buckets and provision of longitudinal feed-back shall allow a flexible handling of the ion bunches for the matching to various user requirements. Results obtained with FOS (first of series) devices, status of realisation and technical challenges resulting from the demanding goals, will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA030
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Closed Orbit Feedback for FAIR - Prototype Tests at SIS18

1784

B.R. Schlei, H. Liebermann, D. Ondreka, P.J. Spiller, R.J. Steinhagen
GSI, Darmstadt, Germany

A new steering software for cycle-to-cycle closed orbit as well as trajectory control is currently under development for FAIR's planned control system. It has been successfully tested with beam at the SIS18 in 2016. COAT (i.e., Controlling Orbits And Trajectories) has been realized as a distributed, Java-based application. It consists of a background daemon process that handles the actual beam-based feedback logic, and independent clients that provide visualization and various user-interaction capabilities. Built on top of the LSA settings management system, code-shared and also used at CERN, the system is kept generic. Furthermore, it is designed to support multiple accelerators, transfer lines and users in parallel. In particular, it can handle continuously changing optics and other in advance known changing beam parameters. The COAT computer program is part of a set of newly developed beam-based feedback tools* for FAIR. Preliminary results of our proof-of-concept prototype studies indicate, e.g., in view of the observed SIS18 machine reproducibility, that such a cycle-to-cycle feedback control scheme may be adequate also for the other FAIR accelerators and transfer lines.
*see separate contribution by R. J. Steinhagen et al.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK045

Export •

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

TUPIK046

Beam-Based Feedbacks for FAIR - Prototyping at the SIS18

1787

R.J. Steinhagen, J. Fitzek, H.C. Hüther, H. Liebermann, R. Müller, D. Ondreka, H. Reeg, B.R. Schlei, P.J. Spiller
GSI, Darmstadt, Germany

The 'Facility for Anti-Proton and Ion Research' (FAIR) presently under construction, extends and supersedes GSI's existing infrastructure. Its core challenges include the precise control of highest proton and uranium ion beam intensities, the required extreme high vacuum conditions, machine protection and activation issues while providing a high degree of multi-user mode of operation with facility reconfiguration on time-scales of a few times per week. To optimise turn-around times and to establish a safe and reliable machine operation, a comprehensive suite of semi-automated measurement applications, as well as fully-automated beam-based feedbacks will be deployed, covering the control of orbit, Q/Q', spill structure, optics, and other machine parameters. These systems are based on the LSA settings management framework, code-shared with and also used at CERN. The concepts, software architecture and first prototype beam tests at the SIS18 in 2016 are presented. As an initial proof-of-concept, a cycle-to-cycle orbit* and macro-spill feedback, as well as a semi-automated magnetic quadrupole- and sextupole-centre measurement tool have been selected.
*results presented in separate contribution

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK046

Export •

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

TUPVA056

Ionization Loss and Dynamic Vacuum in Heavy Ion Synchrotrons

2201

L.H.J. Bozyk, P.J. Spiller
GSI, Darmstadt, Germany

Dynamic vacuum effects, induced by charge exchange processes and ion impact driven gas desorption, generate an intensity limitation for high intensity heavy ion synchrotrons. In order to reach ultimate heavy ion intensities, medium charge state heavy ions are used. The cross sections for charge exchange in collisions with residual gas molecules for such beams are much higher, than for highly charged heavy ion beams. Therefore high pumping power is required to obtain a very low static residual gas pressure and to suppress vacuum dynamics during operation. In modern heavy ion synchrotrons different techniques are employed: NEG-coating, cryogenic pumping, and low-desorption ion-catcher. The unique StrahlSim code allows the comparison of different design options for heavy ion synchrotrons. Different aspects of dynamic vacuum limitations are summarized, such as the dependence on different injection parameter. A comparison between a room temperature and a cryogenic synchrotron from the vacuum point of view is given.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA056

Export •

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

TUPVA059

Overcoming the Space Charge Limit: Development of an Electron Lens for SIS18

2211

D. Ondreka, P.J. Spiller
GSI, Darmstadt, Germany
P. Apse-Apsitis
Riga Technical University, Riga, Latvia
K. Schulte
IAP, Frankfurt am Main, Germany

The 'Facility for Anti-Proton and Ion Research' (FAIR) presently under construction will deliver intense ion beams to its experimental users. The requested intensities require filling the existing synchrotron SIS18, which serves as injector to FAIR, up to the space charge (SC) limit. Operation under these conditions is challenging due to the large tune footprint of the beam, demanding delicate control of adverse effects caused by machine imperfections to avoid emittance growth and beam loss. To facilitate the high intensity operation, the installation of an electron lens for SC compensation into SIS18 is foreseen. This requires an electron beam of a current of several amperes with longitudinal and transverse distributions matched to those of the ion beam during the cycle. The electron beam needs to be RF modulated at a bandwidth of a few MHz with time varying amplitude ranging from DC to fully modulated, while the transverse size needs to be continuously adapted to the adiabatically shrinking ion beam. This contribution reports on the requirements on an electron lens for SC compensation in SIS18.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA059

Export •

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

WEOCB2

Superconducting Magnets at FAIR

2546

E.S. Fischer, A. Bleile, J. Ceballos Velasco, V.I. Datskov, F. Kaether, J.P. Meier, A. Mierau, H. Müller, C. Roux, P.J. Spiller, K. Sugita
GSI, Darmstadt, Germany

For the FAIR (Facility of Antiproton and Ion Research) accelerators, various technologies of superconducting magnets have been developed. In total, 613 superconducting magnets are required for the FAIR modularized start version. For the heavy ion synchrotron SIS100, which is the central accelerator under construction, fast ramped, iron dominated superconducting magnets of the Nuclotron type will be used. Due to the high beam intensity operation desired for SIS100, highest precision and reproducibility is requested for the iron yoke of these magnets. For the dipole magnets of SIS100 the series production has already been released. In parallel, the Super-FRS will be built for the generation of radioactive beams and for isotope separation. Huge aperture superconducting dipole magnets and multiplet modules are required for the main separator of the Super-FRS. For testing of the various types of sc magnets, three test facilities at GSI, JINR and CERN have been set-up. We give an overview on the modern design aspects for the different magnet types and their first test results and the preparation of the appropriate test facilities.

Slides WEOCB2 [12.633 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEOCB2

Export •

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

WEPVA029

SIS100 Tunnel Design and Status

3316

C. Omet, J. Falenski, G. Fehrenbacher, H. Kisker, K. Konradt, A. Sokolov, P.J. Spiller
GSI, Darmstadt, Germany
A. Fischer
FAIR, Darmstadt, Germany

As the FAIR project is proceeding, many of the building and tunnel designs in the meanwhile are frozen and documents are prepared for tendering. For the future FAIR driver accelerator, SIS100, the accelerator tunnel T110 comprises a 1100 m long tunnel, which has a depth of 17 m under ground. In this paper, its environmental boundary conditions, design principles and the finally chosen layout are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA029

Export •

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

WEPVA030

FAIR SIS100 - Features and Status of Realisation

3320

P.J. Spiller, U. Blell, L.H.J. Bozyk, T. Eisel, E.S. Fischer, J. Henschel, P. Hülsmann, H. Klingbeil, H.G. König, H. Kollmus, P. Kowina, J.P. Meier, A. Mierau, C. Mühle, C. Omet, D. Ondreka, V.P. Plyusnin, I. Pongrac, N. Pyka, P. Rottländer, C. Roux, J. Stadlmann, B. Streicher, St. Wilfert
GSI, Darmstadt, Germany

SIS100 is a unique heavy ion synchrotron designed for the generation of high intensity heavy ion and Proton beams. New features and solutions are implemented to enable operation with low charge state heavy ions and to minimize ionization beam loss driven by collisions with the residual gas. SIS100 aims for new frontier and world wide leading Uranium bam intensities. A huge effort is taken to stabilized the dynamics of the residual gas pressure and to suppress ion induced desorption. Fast ramped superconducting magnets have been developed and are in production with highest precision in engineering and field quality, matching the requirements from beams with high space charge. A powerful equipment with Rf stations for fast acceleration, pre- and final compression, for the generation of barrier buckets and provision of longitudinal feed-back shall allow a flexible handling of the ion bunches for the matching to various user requirements. Results obtained with FOS (first of series) devices, status of realisation and technical challenges resulting from the demanding goals, will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA030

Export •

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