IPAC2015 - List of Authors (Bozyk, L.H.J.)

Paper	Title	Page
MOPWA026	Demonstration of Flat Ion Beam Creation and Injection into a Synchrotron	153
	L. Groening, S. Appel, L.H.J. Bozyk, Y. El Hayek, M.T. Maier, C. Xiao GSI, Darmstadt, Germany
	At GSI an ion beam with different horizontal and vertical emittances has been created from a beam with initially equal emittances. This round-to-flat adoption has been accomplished without any beam loss. In the set-up the beam passes through a stripping foil placed inside a solenoid followed by a skewed quadrupole triplet. The amount of beam flatness has been controlled by setting the solenoid field strength only. Increase of the product of the two transverse emittances is purely due to the stripping process that occurs anyway along an ion linac. Beams with different amounts of flatness were injected into a synchrotron applying horizontal multi-turn injection. The efficiency of injection increased as smaller as the horizontal emittance was set by the round-to-flat adaptor.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA026
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THPF009	Pumping Properties of Cryogenic Surfaces in SIS100	3696
	L.H.J. Bozyk, O.K. Kester, P.J. Spiller GSI, Darmstadt, Germany F. Chill, O.K. Kester IAP, Frankfurt am Main, Germany
	Funding: Work supported by Hic4Fair and BMBF (FKZ:05P12RDRBK). The synchrotron SIS100 of the planned FAIR facility will provide heavy ion beams of highest intensities. The required low charge states are subject to enhanced charge exchange processes in collisions with residual gas molecules. Therefore, highest vacuum quality is crucial for a reliable operation and minimal beam loss. The generation of the required low gas densities relies on the pumping capabilities of the cryogenic beam pipe walls. Most typical gas components in ultra high vacuum are bound by cryocondensation at LHe temperatures, resulting in ultimate low pressures with almost infinite pumping capacity. Hydrogen can not be crycondensated to acceptable low pressures. But if the surface coverage is sufficiently low, it can get bound by cryoadsorption. The pumping capabilities of cryogenic walls for Hydrogen have been investigated for SIS100-like conditions. The measurement results have been used in dynamic vacuum simulations at heavy ion operation. The simulation results are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF009
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THPF010	Simulation and Experimental Investigation of Heavy Ion Induced Desorption from Cryogenic Targets	3699
	Ch. Maurer, D.H.H. Hoffmann TU Darmstadt, Darmstadt, Germany L.H.J. Bozyk, H. Kollmus, Ch. Maurer, P.J. Spiller GSI, Darmstadt, Germany
	Funding: Bundesministerium für Bildung und Forschung FKZ 06DA7031 Heavy-ion impact induced gas desorption is the key process that drives beam intensity limiting dynamic vacuum losses. Minimizing this effect, by providing low desorption yield surfaces, is an important issue for maintaining a stable ultra high vacuum during operation with medium charge state heavy ions. For room temperature targets, investigation shows a scaling of the desorption yield with the beam's near-surface electronic energy loss, i.e. a decrease with increasing energy,. An optimized material for a room temperature ion-catcher has been found. But for the planned superconducting heavy-ion synchrotron SIS100 at the FAIR accelerator complex, the ion catcher system has to work in a cryogenic environment. Desorption measurements with the prototype cryocatcher for SIS100 showed an unexpected energy scaling*, which needs to be explained. Understanding this scaling might lead to a better suited choice of material, resulting in a lower desorption yield. Here, new experimental results will be presented along with insights gained from gas dynamics simulations. H. Kollmus et al., AIP Conf. Proc. 773, 207 (2005)) E. Mahner et al., Phys. Rev. ST Accel. Beams 14, 050102 (2011) * L.H.J. Bozyk, H. Kollmus, P.J. Spiller, Proc. of IPAC 2012, p. 3239
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF010
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THPF012	Status of the High Energy Beam Transport System for FAIR	3705
	F. Hagenbuck, L.H.J. Bozyk, S. Damjanovic, A. Krämer, B. Merk, C. Mühle, S. Ratschow, B.R. Schlei, P.J. Spiller, B. Walasek-Höhne, H. Welker, C. Will GSI, Darmstadt, Germany
	The overall layout of the High Energy Beam Transport (HEBT) System of the Facility for Antiproton and Ion Research (FAIR)* did not change since its last presentation in 2008. All necessitated adaptions as for example due to the introduction of the Modularized Start Version (MSV, module 0-3) of FAIR* could be smoothly implemented. In the meanwhile the HEBT system is in its realisation phase with the procurement of its main components in progress. In the following adaptions of the system layout not yet covered in ** are summarized and an overview of the technical system design and procurement status are presented. * FAIR Baseline Technical Report (FBTR), GSI 2006 S. Ratschow et al., Proc. of EPAC08, THPP104, Genoa, Italy (2008) *FAIR Green Paper - The Modularized Start Version, October 2009
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF012
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THPF015	Status of the FAIR Heavy Ion Synchrotron Project SIS100	3715
	P.J. Spiller, U. Blell, L.H.J. Bozyk, J. Ceballos Velasco, T. Eisel, E.S. Fischer, O.K. Kester, H.G. König, H. Kollmus, V. Kornilov, P. Kowina, J.P. Meier, A. Mierau, C. Mühle, C. Omet, D. Ondreka, N. Pyka, H.R. Ramakers, P. Rottländer, C. Roux, P. Schnizer, St. Wilfert GSI, Darmstadt, Germany
	The procurements of major technical components for the heavy ion synchrotron SIS100 are progressing. Especially the production of the long lead items, the main superconducting dipole and quadrupole magnets and the main Rf systems could be started. The system layout for the injection system and the specifications for all injection devices has been completed. In parallel, the Digital Mock-Up (DMU) and design for major extraction components has been developed. Certain technical challenges observed during the acceptance tests of First of Series (FOS) components and risks and their mitigation will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF015
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Paper

Title

Page

Demonstration of Flat Ion Beam Creation and Injection into a Synchrotron

153

L. Groening, S. Appel, L.H.J. Bozyk, Y. El Hayek, M.T. Maier, C. Xiao
GSI, Darmstadt, Germany

At GSI an ion beam with different horizontal and vertical emittances has been created from a beam with initially equal emittances. This round-to-flat adoption has been accomplished without any beam loss. In the set-up the beam passes through a stripping foil placed inside a solenoid followed by a skewed quadrupole triplet. The amount of beam flatness has been controlled by setting the solenoid field strength only. Increase of the product of the two transverse emittances is purely due to the stripping process that occurs anyway along an ion linac. Beams with different amounts of flatness were injected into a synchrotron applying horizontal multi-turn injection. The efficiency of injection increased as smaller as the horizontal emittance was set by the round-to-flat adaptor.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA026

Export •

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

THPF009

Pumping Properties of Cryogenic Surfaces in SIS100

3696

L.H.J. Bozyk, O.K. Kester, P.J. Spiller
GSI, Darmstadt, Germany
F. Chill, O.K. Kester
IAP, Frankfurt am Main, Germany

Funding: Work supported by Hic4Fair and BMBF (FKZ:05P12RDRBK).
The synchrotron SIS100 of the planned FAIR facility will provide heavy ion beams of highest intensities. The required low charge states are subject to enhanced charge exchange processes in collisions with residual gas molecules. Therefore, highest vacuum quality is crucial for a reliable operation and minimal beam loss. The generation of the required low gas densities relies on the pumping capabilities of the cryogenic beam pipe walls. Most typical gas components in ultra high vacuum are bound by cryocondensation at LHe temperatures, resulting in ultimate low pressures with almost infinite pumping capacity. Hydrogen can not be crycondensated to acceptable low pressures. But if the surface coverage is sufficiently low, it can get bound by cryoadsorption. The pumping capabilities of cryogenic walls for Hydrogen have been investigated for SIS100-like conditions. The measurement results have been used in dynamic vacuum simulations at heavy ion operation. The simulation results are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF009

Export •

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

THPF010

Simulation and Experimental Investigation of Heavy Ion Induced Desorption from Cryogenic Targets

3699

Ch. Maurer, D.H.H. Hoffmann
TU Darmstadt, Darmstadt, Germany
L.H.J. Bozyk, H. Kollmus, Ch. Maurer, P.J. Spiller
GSI, Darmstadt, Germany

Funding: Bundesministerium für Bildung und Forschung FKZ 06DA7031
Heavy-ion impact induced gas desorption is the key process that drives beam intensity limiting dynamic vacuum losses. Minimizing this effect, by providing low desorption yield surfaces, is an important issue for maintaining a stable ultra high vacuum during operation with medium charge state heavy ions. For room temperature targets, investigation shows a scaling of the desorption yield with the beam's near-surface electronic energy loss, i.e. a decrease with increasing energy*,**. An optimized material for a room temperature ion-catcher has been found. But for the planned superconducting heavy-ion synchrotron SIS100 at the FAIR accelerator complex, the ion catcher system has to work in a cryogenic environment. Desorption measurements with the prototype cryocatcher for SIS100 showed an unexpected energy scaling***, which needs to be explained. Understanding this scaling might lead to a better suited choice of material, resulting in a lower desorption yield. Here, new experimental results will be presented along with insights gained from gas dynamics simulations.
* H. Kollmus et al., AIP Conf. Proc. 773, 207 (2005))
** E. Mahner et al., Phys. Rev. ST Accel. Beams 14, 050102 (2011)
*** L.H.J. Bozyk, H. Kollmus, P.J. Spiller, Proc. of IPAC 2012, p. 3239

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF010

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

THPF012

Status of the High Energy Beam Transport System for FAIR

3705

F. Hagenbuck, L.H.J. Bozyk, S. Damjanovic, A. Krämer, B. Merk, C. Mühle, S. Ratschow, B.R. Schlei, P.J. Spiller, B. Walasek-Höhne, H. Welker, C. Will
GSI, Darmstadt, Germany

The overall layout of the High Energy Beam Transport (HEBT) System of the Facility for Antiproton and Ion Research (FAIR)* did not change since its last presentation in 2008**. All necessitated adaptions as for example due to the introduction of the Modularized Start Version (MSV, module 0-3) of FAIR*** could be smoothly implemented. In the meanwhile the HEBT system is in its realisation phase with the procurement of its main components in progress. In the following adaptions of the system layout not yet covered in ** are summarized and an overview of the technical system design and procurement status are presented.
* FAIR Baseline Technical Report (FBTR), GSI 2006
** S. Ratschow et al., Proc. of EPAC08, THPP104, Genoa, Italy (2008)
***FAIR Green Paper - The Modularized Start Version, October 2009

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF012

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

THPF015

Status of the FAIR Heavy Ion Synchrotron Project SIS100

3715

P.J. Spiller, U. Blell, L.H.J. Bozyk, J. Ceballos Velasco, T. Eisel, E.S. Fischer, O.K. Kester, H.G. König, H. Kollmus, V. Kornilov, P. Kowina, J.P. Meier, A. Mierau, C. Mühle, C. Omet, D. Ondreka, N. Pyka, H.R. Ramakers, P. Rottländer, C. Roux, P. Schnizer, St. Wilfert
GSI, Darmstadt, Germany

The procurements of major technical components for the heavy ion synchrotron SIS100 are progressing. Especially the production of the long lead items, the main superconducting dipole and quadrupole magnets and the main Rf systems could be started. The system layout for the injection system and the specifications for all injection devices has been completed. In parallel, the Digital Mock-Up (DMU) and design for major extraction components has been developed. Certain technical challenges observed during the acceptance tests of First of Series (FOS) components and risks and their mitigation will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF015

Export •

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