IPAC2012 - List of Authors (Baumbach, T.)

Paper	Title	Page
MOPPP066	Calculated Spectra from Magnetic Field Measurements of 1.5 m Superconducting Undulator Coils	711
	S. Casalbuoni, T. Baumbach, S. Gerstl, A.W. Grau, M. Hagelstein, T. Holubek, D. Saez de Jauregui Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany C. Boffo, W. Walter BNG, Würzburg, Germany
	In this contribution we report on the spectra calculated from the field measurements performed in a liquid helium bath of 1.5 m superconducting undulator coils. The coils are foreseen for a superconducting undulator demonstrator with a period length of 15 mm planned to be installed in ANKA middle 2012 and tested at the new beamline NANO for high resolution X-ray diffraction. The spectral performance at ANKA and at low emittance sources is compared with the competing cryogenic permanent magnet technology.

MOPPP067	In-vacuum, Cryogen-free Field Measurement System for Superconducting Undulator Coils	714
	A.W. Grau, T. Baumbach, S. Casalbuoni, S. Gerstl, M. Hagelstein, T. Holubek, D. Saez de Jauregui Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
	The performance of superconducting insertion devices (IDs) depends strongly on the magnetic field quality. Before installing IDs in synchrotron light sources the characterization and precise measurements of their magnetic properties are of fundamental importance. Improvements in magnetic field measurement technology of conventional, i.e. permanent magnet based IDs, made significant progress during the last years and push the capabilities of synchrotron light sources. For superconducting IDs similar major developments are necessary. As a part of our R&D program for superconducting insertion devices we perform quality assessment of their magnetic field properties. This contribution describes details and challenges of the cryostat and measurement setup assembly to perform magnetic measurements of the local field and of the field integrals of superconducting undulator coils in a cold in-vacuum (cryogen free) environment. The focus will be on the outcome of the final acceptance test together with results of first tests performed with mock-up coils.

MOPPP069	First Measurements of COLDDIAG: A Cold Vacuum Chamber for Diagnostics	720
	S. Gerstl, T. Baumbach, S. Casalbuoni, A.W. Grau, M. Hagelstein, T. Holubek, D. Saez de Jauregui Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany R. Bartolini, M.P. Cox, J.C. Schouten, R.P. Walker Diamond, Oxfordshire, United Kingdom M. Migliorati, B. Spataro INFN/LNF, Frascati (Roma), Italy I.R.R. Shinton UMAN, Manchester, United Kingdom
	Superconductive insertion devices can reach, for the same gap and period length, higher fields with respect to permanent magnet insertion devices. One of the still open issues for the development of superconductive insertion devices, is the understanding of the heat intake from the electron beam. COLDDIAG, a cold vacuum chamber for diagnostics was designed and built specifically for this purpose. With the equipped instrumentation, which covers temperature sensors, pressure gauges, mass spectrometers as well as retarding field analyzers it is possible to measure the beam heat load, total pressure, gas content as well as the flux of particles hitting the chamber walls. Here we report about the preliminary measurements and results of COLDDIAG installed in the Diamond storage ring.

MOPPP070	Characterization of Vacuum Chamber Samples for Superconducting Insertion Devices	723
	D. Saez de Jauregui, T. Baumbach, S. Casalbuoni, S. Gerstl, A.W. Grau, M. Hagelstein, C. Heske, T. Holubek, B. Krause, A. Seiler, S. Stankov, L. Weinhardt Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany C.Z. Antoine, Y. Boudigou CEA/IRFU, Gif-sur-Yvette, France C. Boffo BNG, Würzburg, Germany
	One of the key components of a superconducting insertion device is the ultra-high vacuum (UHV) chamber. In order to reach the accelerator UHV specifications, it is very important to control the surface chemical content and find proper cleaning procedures. To keep the geometric and resistive wall losses small, it is essential that the top few μm of the surface exhibits low roughness and good electrical conductivity at low temperatures. A 300-μm-thick 316L stainless steel foil, galvanized with a 30-μm copper layer, is used for the next superconducting undulator developed in a collaboration between KIT and BNG. We report here on different spectroscopic analyses as well as on residual resistivity ratio RRR measurements of the copper surface after cleaning procedures and annealing at various temperatures for different periods of time.

MOPPP071	In Vacuum Conduction Cooled Superconducting Switch for Insertion Devices with Variable Period Length	726
	T. Holubek, T. Baumbach, S. Casalbuoni, S. Gerstl, A.W. Grau, M. Hagelstein, D. Saez de Jauregui Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany C. Boffo, W. Walter BNG, Würzburg, Germany
	Switching the period length allows to increase the tunability of an insertion device. This can be realized in superconducting insertion devices (IDs) by reversing the current in a separately powered subsets of the superconducting windings. In order to use only one power supply instead of two for the two circuits, reducing the thermal input to the device, work is ongoing at ANKA to develop a superconducting switch. In this work we present the results of the test of an in-vacuum housed, conduction-cooled superconducting switch.

Paper

Title

Page

Calculated Spectra from Magnetic Field Measurements of 1.5 m Superconducting Undulator Coils

711

S. Casalbuoni, T. Baumbach, S. Gerstl, A.W. Grau, M. Hagelstein, T. Holubek, D. Saez de Jauregui
Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
C. Boffo, W. Walter
BNG, Würzburg, Germany

In this contribution we report on the spectra calculated from the field measurements performed in a liquid helium bath of 1.5 m superconducting undulator coils. The coils are foreseen for a superconducting undulator demonstrator with a period length of 15 mm planned to be installed in ANKA middle 2012 and tested at the new beamline NANO for high resolution X-ray diffraction. The spectral performance at ANKA and at low emittance sources is compared with the competing cryogenic permanent magnet technology.

MOPPP067

In-vacuum, Cryogen-free Field Measurement System for Superconducting Undulator Coils

714

A.W. Grau, T. Baumbach, S. Casalbuoni, S. Gerstl, M. Hagelstein, T. Holubek, D. Saez de Jauregui
Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

The performance of superconducting insertion devices (IDs) depends strongly on the magnetic field quality. Before installing IDs in synchrotron light sources the characterization and precise measurements of their magnetic properties are of fundamental importance. Improvements in magnetic field measurement technology of conventional, i.e. permanent magnet based IDs, made significant progress during the last years and push the capabilities of synchrotron light sources. For superconducting IDs similar major developments are necessary. As a part of our R&D program for superconducting insertion devices we perform quality assessment of their magnetic field properties. This contribution describes details and challenges of the cryostat and measurement setup assembly to perform magnetic measurements of the local field and of the field integrals of superconducting undulator coils in a cold in-vacuum (cryogen free) environment. The focus will be on the outcome of the final acceptance test together with results of first tests performed with mock-up coils.

MOPPP069

First Measurements of COLDDIAG: A Cold Vacuum Chamber for Diagnostics

720

S. Gerstl, T. Baumbach, S. Casalbuoni, A.W. Grau, M. Hagelstein, T. Holubek, D. Saez de Jauregui
Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
R. Bartolini, M.P. Cox, J.C. Schouten, R.P. Walker
Diamond, Oxfordshire, United Kingdom
M. Migliorati, B. Spataro
INFN/LNF, Frascati (Roma), Italy
I.R.R. Shinton
UMAN, Manchester, United Kingdom

Superconductive insertion devices can reach, for the same gap and period length, higher fields with respect to permanent magnet insertion devices. One of the still open issues for the development of superconductive insertion devices, is the understanding of the heat intake from the electron beam. COLDDIAG, a cold vacuum chamber for diagnostics was designed and built specifically for this purpose. With the equipped instrumentation, which covers temperature sensors, pressure gauges, mass spectrometers as well as retarding field analyzers it is possible to measure the beam heat load, total pressure, gas content as well as the flux of particles hitting the chamber walls. Here we report about the preliminary measurements and results of COLDDIAG installed in the Diamond storage ring.

MOPPP070

Characterization of Vacuum Chamber Samples for Superconducting Insertion Devices

723

D. Saez de Jauregui, T. Baumbach, S. Casalbuoni, S. Gerstl, A.W. Grau, M. Hagelstein, C. Heske, T. Holubek, B. Krause, A. Seiler, S. Stankov, L. Weinhardt
Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
C.Z. Antoine, Y. Boudigou
CEA/IRFU, Gif-sur-Yvette, France
C. Boffo
BNG, Würzburg, Germany

One of the key components of a superconducting insertion device is the ultra-high vacuum (UHV) chamber. In order to reach the accelerator UHV specifications, it is very important to control the surface chemical content and find proper cleaning procedures. To keep the geometric and resistive wall losses small, it is essential that the top few μm of the surface exhibits low roughness and good electrical conductivity at low temperatures. A 300-μm-thick 316L stainless steel foil, galvanized with a 30-μm copper layer, is used for the next superconducting undulator developed in a collaboration between KIT and BNG. We report here on different spectroscopic analyses as well as on residual resistivity ratio RRR measurements of the copper surface after cleaning procedures and annealing at various temperatures for different periods of time.

MOPPP071

In Vacuum Conduction Cooled Superconducting Switch for Insertion Devices with Variable Period Length

726

T. Holubek, T. Baumbach, S. Casalbuoni, S. Gerstl, A.W. Grau, M. Hagelstein, D. Saez de Jauregui
Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
C. Boffo, W. Walter
BNG, Würzburg, Germany

Switching the period length allows to increase the tunability of an insertion device. This can be realized in superconducting insertion devices (IDs) by reversing the current in a separately powered subsets of the superconducting windings. In order to use only one power supply instead of two for the two circuits, reducing the thermal input to the device, work is ongoing at ANKA to develop a superconducting switch. In this work we present the results of the test of an in-vacuum housed, conduction-cooled superconducting switch.