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ABSTRACT: Babcock Noell GmbH (BNG) is completing the fabrication of a 1.5 m long superconducting insertion device for the Karlsruhe Institute of Technology (KIT). The unit is planned to be installed in the ANKA storage ring at the end of 2010 to become the light source of the new beamline NANO for high resolution X-ray diffraction. The period length of the device is 15 mm for a total of 100.5 full periods plus an additional matching period at each end. The key specifications of the system are: a K value higher than 2 for a magnetic gap of 5 mm, the capability of withstanding a 4 W beam heat load and a phase error smaller than 3.5 degrees. The superconducting coils have been qualified by means of a vertical test in liquid helium at CERN and are ready to be installed in the cryostat. This paper describes the main features of the system.
IEEE Transactions on Appiled Superconductivity 07/2011; · 1.04 Impact Factor
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ABSTRACT: In this contribution we report the results of the training and of the local field measurements performed in a liquid helium bath of the ANKA superconducting undulator. The period length is 15 mm and the coils are 1.5 m long. The key specifications of the system are an undulator parameter K higher than 2 (for a magnetic gap of 5 mm) and a phase error smaller than 3.5 degrees. The superconducting undulator is planned to be installed in the ANKA storage ring by the beginning of 2011 to be the light source of the new beamline NANO for high resolution X-ray diffraction..
IEEE Transactions on Appiled Superconductivity 07/2011; · 1.04 Impact Factor
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ABSTRACT: Accurate magnetic field measurements are a prerequisite for the characterization and optimization of undulators. The precision for measuring the magnetic properties of conventional, i.e., permanent magnet based insertion devices, has undergone tremendous improvements over the past 10 to 15 years initiating a new era in synchrotron light sources worldwide; a similar break through is now necessary in the field of superconducting insertion devices. In this contribution we describe the planned instrumentation needed to perform magnetic measurements of the local field, and field integrals, of up to 2 m length superconducting undulator coils while in a cold-in-vacuum (helium free) environment.
IEEE Transactions on Appiled Superconductivity 07/2011; · 1.04 Impact Factor
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ABSTRACT: Superconducting insertion devices (IDs) are very attractive for synchrotron light sources since they offer the possibility to enhance the tuning range and functionality significantly by period length switching. Period length switching can be achieved by employing two or more individually powerable subsets of superconducting coils and reverse the current in a part of the windings. In this contribution we report the first experimental test of this principle demonstrated on a 70 mm NbTi mock-up coil with period tripling, allowing to switch between a 15 mm period length undulator and a 45 mm wiggler (SCUW 15/45).
IEEE Transactions on Appiled Superconductivity 07/2011; · 1.04 Impact Factor
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S. Casalbuoni,
T. Baumbach,
S. Gerstl,
G. Grau,
M. Hagelstein,
D. Saez de Jauregui,
C. Boffo,
G. Sikler,
V. Baglin,
R. Cimino, [......],
A. Mostacci,
M. Cox,
J. Schouten,
E. Wallen,
R. Weigel,
J. Clarke,
D. Scott,
T. Bradshaw,
I. Shinton,
R. Jones
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ABSTRACT: One of the still open issues for the development of superconducting insertion devices is the understanding of the heat load induced by the beam passage. With the aim of measuring the beam heat load to a cold bore and in order to gain a deeper understanding in the beam heat load mechanisms, a cold vacuum chamber for diagnostics is under construction. We plan to have access with the same set-up to a number of different diagnostics, so we are implementing: i) retarding field analysers to measure the electron flux, ii) temperature sensors to measure the total heat load, iii) pressure gauges, iv) and mass spectrometers to measure the gas content. The inner vacuum chamber will be removable in order to test different geometries and materials. COLDDIAG is built to fit in a short straight section at ANKA, but we are proposing its installation in different synchrotron light sources with different energies and beam characteristics. A first installation in DIAMOND is planned in June 2011. Here we describe the technical design report of this device and the planned measurements with beam.
IEEE Transactions on Appiled Superconductivity 07/2011; · 1.04 Impact Factor
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ABSTRACT: In order to produce synchrotron radiation of the highest brilliance, third generation synchrotron sources make use of insertion devices (IDs). The state of the art available today for IDs is the permanent magnet technology with magnet blocks placed inside the vacuum (IVU) of the storage ring. Following an initial proposal at SPring-8 [11.
Hara , T. , Tanaka , T. , Kitamura , H. , Bizen , T. , Marchal , X. , Seike , T. , Kohda , T. and Matsuura , Y. 2004 . Phys. Rev. ST Accel. Beams , 7 : 050702 [CrossRef], [Web of Science ®]View all references], the concept of Cryogenic Permanent Magnet Undulators (CPMU) is presently considered as a possible future evolution of in-vacuum undulators [2–5View all references]. Superconducting undulators (SCUs) can reach, for the same gap and period length, even higher fields than CPMU devices, allowing increases in the spectral range and the brilliance. At ANKA we are running a research and development program to develop superconducting IDs. The proof of principle of SCU technology application in a storage ring has been demonstrated at ANKA with a device developed together with the company ACCEL Instr. GmbH and installed in the ANKA storage ring since March 2005 [66.
Casalbuoni , S. , Grau , A. , Hagelstein , M. , Rossmanith , R. , Zimmermann , F. , Kostka , B. , Mashkina , E. , Steffens , E. , Bernhard , A. , Wollmann , D. and Baumbach , T. 2007 . Phys. Rev. ST Accel. Beams , 10 : 093202 [CrossRef], [Web of Science ®]View all references].
Synchrotron Radiation News 05/2011; 24(3):14-19.
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ABSTRACT: Superconducting insertion devices (IDs) are very attractive for synchrotron light sources since they allow increasing the flux and/or the photon energy with respect to permanent magnet IDs. Babcock Noell GmbH (BNG) is completing the fabrication of a 1.5 m long unit for ANKA at the Research Center in Karlsruhe (FZK). The period length of the device is 15 mm for a total of 100.5 full periods plus an additional matching period at each end. The key specifications of the system are: a K-value higher than 2, the capability of withstanding a 4 W beam heat load and a phase error smaller than 3.5 degrees. The magnet is in the final stages of the winding process and will be soon tested at CERN in liquid helium in vertical configuration. This paper describes the main features of the system, the results of the prototyping phase and details of manufacturing process.
IEEE Transactions on Appiled Superconductivity 07/2010; · 1.04 Impact Factor
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S Gerstl,
T Baumbach, S. Casalbuoni,
A. W. Grau,
M Hagelstein,
D. Saez de Jauregui,
C. Boffo,
G. Sikler,
V Baglin,
M. P. Cox, [......],
M. Commisso,
B. Spataro,
A Mostacci,
E. J. Wallén,
R Weigel,
J Clarke,
D Scott,
T. W. Bradshaw,
R. M. Jones,
I. R. R. Shinton
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ABSTRACT: One of the still open issues for the development of superconducting insertion devices is the understanding of the beam heat load. With the aim of measuring the beam heat load to a cold bore and the hope to gain a deeper understanding in the beam heat load mechanisms, a cold vacuum chamber for diagnostics is under construction. The following diagnostics will be implemented: i) retarding field analyzers to measure the electron energy and flux, ii) temperature sensors to measure the total heat load, iii) pressure gauges, iv) and mass spectrometers to measure the gas content. The inner vacuum chamber will be removable in order to test different geometries and materials. This will allow the installation of the cryostat in different synchrotron light sources. COLDDIAG will be built to fit in a short straight section at ANKA. A first installation at the synchrotron light source Diamond is foreseen in June 2011. Here we describe the technical design report of this device and the planned measurements with beam. Comment: Presented at First International Particle Accelerator Conference, IPAC'10, Kyoto, Japan, from 23 to 28 May 2010
06/2010;
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ABSTRACT: Accurate magnetic field measurements are a prerequisite for the characterization and optimization of undulators. At the synchrotron light source ANKA there is an ongoing R&D program for superconducting insertion devices. Within this program a test stand for precise magnetic field measurements of superconductive coils was designed, built and installed at the Research Center Karlsruhe. Comprehensive magnetic measurements are performed to confirm the magnet design and to detect or correct field imperfections resulting from the manufacturing process. The magnetic field is measured along a fixed direction by Hall probes with a positioning precision of 3 mum. A NbTi undulator prototype with local correction coils was built to verify the performance of the superconductor and the shimming concept. In this contribution we describe the measuring test station and preliminary tests results including the efficiency of the shimming concept.
IEEE Transactions on Appiled Superconductivity 07/2009; · 1.04 Impact Factor
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ABSTRACT: Superconducting undulators generate, for a given period length and a given gap, higher fields than permanent magnet undulators. Since in an undulator the photons add up coherently over the whole undulator length, even small magnetic field errors can disturb the superposition of photons and reduce the intensity of the generated photon beam. Therefore, as in any other undulator, the magnetic field has to be measured with high accuracy.
IEEE Transactions on Appiled Superconductivity 07/2009; · 1.04 Impact Factor
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C. Boffo,
T. Baumbach,
A. Bernhard,
M. Borlein, S. Casalbuoni,
A. Grau,
M. Hagelstein,
B. Kostka,
E. Mashkina,
P. Peiffer,
R. Rossmanith,
W. Walter,
D. Wollmann
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ABSTRACT: Superconducting insertion devices are very attractive for synchrotron light sources. For a given gap and period length, higher fields can be reached in respect to permanent magnet insertion devices thus permitting to reach higher photon fluxes. A new R&D program has been recently launched at ANKA aiming for the development of the next generation superconducting insertion devices for light sources. A cold bore superconducting undulator (14 mm period length, 100 full periods long) is installed in the ANKA storage ring since three years. This will be replaced by an improved version which shows a more efficient cooling system and a high precision design aiming for reduced field errors. Two additional devices are scheduled. One will allow to electrically switch the period length between 15 mm and 45 mm corresponding to an undulator and a wiggler mode, respectively. The other will be optimized for third generation light sources. It will be capable of tolerating higher beam heat loads up to 6 W while achieving very small field errors. The field error minimization will be obtained through the use of new shimming concepts which will correct inaccuracies due to manufacturing tolerances. This paper describes the technical concepts of the three projects.
IEEE Transactions on Appiled Superconductivity 07/2009; · 1.04 Impact Factor
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E. Mashkina,
A. Grau,
T. Baumbach,
A. Bernhard, S. Casalbuoni,
M. Hagelstein,
B. Kostka,
R. Rossmanith,
T. Schneider,
E. Steffens,
D. Wollmann
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ABSTRACT: Superconducting undulators and wigglers are developed for synchrotron light sources, damping rings for linear colliders and polarized positron sources. In an undulator the emitted photons along the trajectory have to interfere. In order to do so the magnetic field in all periods has to be almost identical. The field strength over one or several hundred periods is not allowed to deviate by more than 1%. Translated into mechanical accuracy the position of the wire and the poles has to be more accurate than about 5 over 1 to 2 m. High quality measurement of the field is an essential requirement. In this paper we present two field measuring systems, one is under construction and another one is under design phase at the Forschungszentrum Karlsruhe.
IEEE Transactions on Appiled Superconductivity 07/2008; · 1.04 Impact Factor
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E Mashkina,
A Grau,
Th Schneider,
A Bernhard, S Casalbuoni,
M Hagelstein,
B Kostka,
R Rossmanith,
E Steffens,
D Wollmann,
T Baumbach
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ABSTRACT: For a given gap and a given period length superconductive cold-bore undulators have a higher field strength compared to permanent magnet undulators. The measurement of the field and the field quality in the cold bore is demanding since the position of the Hall-probes have to be precise within a few microns over a distance of one to two meters. At the Forschungszentrum Karlsruhe two measuring facilities are under construction which allow to measure short mock-ups and undulators with a length of up to two meters. In this paper the two devices called CASPER (ChAracterization Setup for Phase Error Reduction) are described.
Journal of Physics Conference Series 03/2008; 97(1):012020.
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S. Casalbuoni,
A. Grau,
M. Hagelstein,
R. Rossmanith,
F. Zimmermann,
B. Kostka,
E. Mashkina,
E. Steffens,
A. Bernhard,
D. Wollmann,
T. Baumbach
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ABSTRACT: The beam heat load in the cold bore superconductive undulator installed at ANKA has been monitored for almost two years. The possible sources of the observed heat load as synchrotron radiation from upstream magnets, image currents, photo-excited electrons and ions will be discussed and compared with the experimental results.
Particle Accelerator Conference, 2007. PAC. IEEE; 07/2007
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S. Casalbuoni,
A. Grau,
M. Hagelstein,
R. Rossmanith,
A. Bernhard,
A.-S. Mueller,
D. Wollmann,
T. Baumbach,
B. Kostka,
E. Mashkina,
E. Steffens,
H. Braun,
M. Korostelev,
Y. Papaphilippou,
F. Zimmermann
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ABSTRACT: The CLIC damping ring requires wigglers with both high on-axis fields and short periods. The present design foresees a superconductive wiggler with a period length of 5 cm, a peak on-axis field of 2.5 T and a full aperture of 12 mm. In this paper we explore the performance improvements of the damping ring when these parameters are pushed to 2.7 T at a period length of 2 cm with the expense of a reduced aperture of 5 mm. A design for a prototype for testing the field quality of such a wiggler is presented in this paper and the possibility to test this wiggler with beam in the storage ring ANKA is described.
Particle Accelerator Conference, 2007. PAC. IEEE; 07/2007
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A. Bernhard, S. Casalbuoni,
R. Frahm,
B. Griesebock,
U. Haake,
M. Hagelstein,
B. Kostka,
Y.L. Mathis,
A.S. Muller,
R. Rossmanith,
F. Schock,
E. Steffens,
M. Weier,
D. Wollmann,
T. Baumbach
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ABSTRACT: In March 2005 a superconducting cold-bore undulator was installed in ANKA (ANSTROEM SOURCE IN KARLSRUHE) and since that time has been in operation. The purpose of the installation was to evaluate if such a device can be operated in a heavy duty synchrotron radiation user facility like ANKA without problems. In order to demonstrate this the generated spectra were measured and the heat load induced by the beam was investigated. It was shown that the heat deposited by the beam in the 8 mm gap is less than 1 W per 100 mA at 2.5 GeV and can be cooled by cryocoolers. Finally, reference is made to the spectra produced by sub-picosecond X-rays using a special ANKA optics.
IEEE Transactions on Appiled Superconductivity 07/2007; · 1.04 Impact Factor
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ABSTRACT: Superconductive undulators with a small period length are a novel tool in generating X-ray beams with high brlliance. The concept and the first prototype for a s storage ring was developed for ANKA, a 2.5 GeV synchrotron light source in Karlsruhe, Germany.
Journal of Physics Conference Series 07/2006; 43(1):719.
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A. Bernhard, S. Casalbuoni,
R. Frahm,
B. Griesebock,
U. Haake,
M. Hagelstein,
M. Kläser,
B. Kostka,
A.S. Müller,
Robert Rossmanith,
Th. Schneider,
F. Schoeck,
E. Steffens,
M. Weisser,
D. Wollmann,
T. Baumbach
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ABSTRACT: In 2005 a test superconductive undulator was installed in the ANKA storage ring. Since then the undulator has been constantly in operation as the first cold-bore, small-gap superconducting undulator ever installed in a storage ring. The aim of this experiment was to demonstrate that such a device can be operated under normal user conditions. Compared with permanent magnet undulators, superconducting undulators have a higher magnetic field strength (for a given period length and a given gap width) and can be tuned electrically. The higher field strength allows the production of photon beams with higher brilliance and higher photon energy.
Synchrotron Radiation News 05/2006; 19(3):9-17.
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V. Ayvazyan,
N. Baboi,
J. Bähr,
V. Balandin,
B. Beutner,
A Brandt,
I Bohnet,
A. Bolzmann,
R Brinkmann,
O.I. Brovko, [......],
T. Weiland,
H. Weise,
M. Wendt,
I. Will,
A. Winter,
K. Wittenburg,
M.V. Yurkov,
I. Zagorodnov,
P. Zambolin,
K. Zapfe
The European Physical Journal D 01/2006; 37:297. · 1.48 Impact Factor
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ABSTRACT: For the operation of a SASE FEL, the longitudinal bunch profile is one of the most critical parameters. At the superconducting linac of the VUV-FEL at DESY, an electro optic sampling (EOS) experiment was installed to probe the time structure of the electric field of the bunches to better than 100 fs rms. The field induced birefringence of a ZnTe crystal is detected by a femtosecond laser pulse (TiSa) and the time structure is measured by scanning the relative timing of the electron bunch and the TiSa pulse. A synchronization stability of better than 70 fs between laser and accelerator RF has been achieved. First results on the synchronization and the bunch profile measurements are presented.
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
