BIW2012 - List of Authors (Schwickert, M.)

Paper

Title

Page

Field Attenuation of the Magnetic Shield for a Cryogenic Current Comparator

17

F. Kurian, P. Hülsmann, P. Kowina, D.A. Liakin, H. Reeg, M. Schwickert
GSI, Darmstadt, Germany
R. Geithner, R. Neubert
FSU Jena, Jena, Germany
W. Vodel
HIJ, Jena, Germany

Funding: Work supported by EU, DITANET, Project No. ITN-2008-215080
The upcoming FAIR facility requires measurements of very low ion currents during slow extraction from the synchrotron SIS100. A Cryogenic Current Comparator (CCC), with its capability to measure absolute ion beam currents non-destructively down to nA range, is foreseen to be installed in various locations of the high energy beam transport section of FAIR. The current resolution of the CCC is only limited by the system noise, mainly originating from the environmental electromagnetic fields and mechanical vibrations. A meander-shaped superconducting shield geometry covering the pick-up coil efficiently suppresses disturbing non-azimuthal field components. The attenuation of external magnetic field components by the shield in different field directions is studied for various geometrical and material parameters by means of an FEM simulation. The simulation results are compared with attenuation factors obtained by experiments.

TUCP03

Pilot Studies on Optical Transition Radiation Imaging of Non-relativistic Ions at GSI

130

B. Walasek-Höhne, C.A. Andre, F. Becker, P. Forck, A. Reiter, M. Schwickert
GSI, Darmstadt, Germany
A.H. Lumpkin
Fermilab, Batavia, USA

For relativistic particles optical transition radiation (OTR) is a well established method of transverse profile monitoring. Within a pilot experiment the applicability of OTR even for non-relativistic heavy ions was evaluated for the first time using an uranium beam of 11.4 MeV/u (corresponding to β=0.15) of different charge states. This study aimed to find a thermally stable OTR target for highly-ionizing heavy-ions and to detect reliable transverse profiles, taking advantage of high particle charge q. The exact gating feature of an image-intensified CCD camera was used to select the prompt OTR signal versus any background sources with a longer emission time constant like e.g. blackbody radiation. To test the q-dependence of the light yield, a moveable stripping foil upstream of the target was installed to increase the mean charge. During initial tests, a stainless steel target proved superior thermal behaviour and q2 dependence was observed. Profile comparison with SEM-Grid data as well as the analysis of spectroscopic measurements will be presented.

Slides TUCP03 [6.112 MB]

Paper	Title	Page
MOPG001	Field Attenuation of the Magnetic Shield for a Cryogenic Current Comparator	17
	F. Kurian, P. Hülsmann, P. Kowina, D.A. Liakin, H. Reeg, M. Schwickert GSI, Darmstadt, Germany R. Geithner, R. Neubert FSU Jena, Jena, Germany W. Vodel HIJ, Jena, Germany
	Funding: Work supported by EU, DITANET, Project No. ITN-2008-215080 The upcoming FAIR facility requires measurements of very low ion currents during slow extraction from the synchrotron SIS100. A Cryogenic Current Comparator (CCC), with its capability to measure absolute ion beam currents non-destructively down to nA range, is foreseen to be installed in various locations of the high energy beam transport section of FAIR. The current resolution of the CCC is only limited by the system noise, mainly originating from the environmental electromagnetic fields and mechanical vibrations. A meander-shaped superconducting shield geometry covering the pick-up coil efficiently suppresses disturbing non-azimuthal field components. The attenuation of external magnetic field components by the shield in different field directions is studied for various geometrical and material parameters by means of an FEM simulation. The simulation results are compared with attenuation factors obtained by experiments.

TUCP03	Pilot Studies on Optical Transition Radiation Imaging of Non-relativistic Ions at GSI	130
	B. Walasek-Höhne, C.A. Andre, F. Becker, P. Forck, A. Reiter, M. Schwickert GSI, Darmstadt, Germany A.H. Lumpkin Fermilab, Batavia, USA
	For relativistic particles optical transition radiation (OTR) is a well established method of transverse profile monitoring. Within a pilot experiment the applicability of OTR even for non-relativistic heavy ions was evaluated for the first time using an uranium beam of 11.4 MeV/u (corresponding to β=0.15) of different charge states. This study aimed to find a thermally stable OTR target for highly-ionizing heavy-ions and to detect reliable transverse profiles, taking advantage of high particle charge q. The exact gating feature of an image-intensified CCD camera was used to select the prompt OTR signal versus any background sources with a longer emission time constant like e.g. blackbody radiation. To test the q-dependence of the light yield, a moveable stripping foil upstream of the target was installed to increase the mean charge. During initial tests, a stainless steel target proved superior thermal behaviour and q2 dependence was observed. Profile comparison with SEM-Grid data as well as the analysis of spectroscopic measurements will be presented.
	Slides TUCP03 [6.112 MB]