SRF2011 - List of Authors (Schlander, F.)

Paper

Title

Page

Results on Large Grain Nine-Cell Cavities at DESY: Gradients up to 45 MV/m after Electropolishing

490

D. Reschke, S. Aderhold, A. Gössel, J. Iversen, S. Karstensen, D. Kostin, G. Kreps, A. Matheisen, W.-D. Möller, F. Schlander, W. Singer, X. Singer, N. Steinhau Kühl, A.A. Sulimov, K. Twarowski
DESY, Hamburg, Germany

Since 2009 a series of eight nine-cell cavities (AC151 – AC158) of TESLA shape fabricated of large grain (LG) niobium material is under preparation and test at DESY. In a first step all cavities were tested after a BCP treatment. In a second step additional electro polishing is applied to all cavities. In this paper the treatment will be discussed and present results will be reported

TUPO066

Analysis of Recent Results from Second Sound, Temperature Mapping and Optical Inspection of 1.3 GHz Cavities at DESY

558

F. Schlander, S. Aderhold, D. Reschke, K. Twarowski
DESY, Hamburg, Germany

DESY is preparing for the delivery of some 600 superconducting 9-cell cavities for the European XFEL. Analysing the history and recorded data of recently tested cavities gives important evidence for proper treatment, preparation and handling of cavities. The experience given by temperature mapping, the Second Sound technique and optical inspection will be compared and an overview of the results obtained so far will be given in this report.

Poster TUPO066 [1.160 MB]

THPO031

Second Sound as an automated Quench Localisation Tool at DESY

785

F. Schlander, E. Elsen, D. Reschke
DESY, Hamburg, Germany

Funding: This work is supported by the Commission of the European Communities under the 7th Framework Programme “Construction of New Infrastructures – Preparatory Phase”, contract number 206711.
The understanding of local thermal breakdown (“quench“) in superconducting RF cavities is still a challenge. An easy way to find these heat spots is to measure the Second Sound in superfluid helium. This detection technique has been examined in several institutes. At DESY there are currently two vertical bath cryostats where cold RF tests with a cavity mounted in a cryostat insert can be done. At all of the four inserts the Second Sound setup consisting of eight Oscillating Superleak Transducers (OSTs) is mounted. These are connected to amplifier electronics and the measured signals are fed into an ADC to be read out with MATLAB. Within MATLAB the location is derived from the measured propagation times. The present system is already in use on a regular basis. An automated setup which will be implemented into the usual RF measurements is under development and the current status will be described.

Poster THPO031 [0.550 MB]

Paper	Title	Page
TUPO046	Results on Large Grain Nine-Cell Cavities at DESY: Gradients up to 45 MV/m after Electropolishing	490
	D. Reschke, S. Aderhold, A. Gössel, J. Iversen, S. Karstensen, D. Kostin, G. Kreps, A. Matheisen, W.-D. Möller, F. Schlander, W. Singer, X. Singer, N. Steinhau Kühl, A.A. Sulimov, K. Twarowski DESY, Hamburg, Germany
	Since 2009 a series of eight nine-cell cavities (AC151 – AC158) of TESLA shape fabricated of large grain (LG) niobium material is under preparation and test at DESY. In a first step all cavities were tested after a BCP treatment. In a second step additional electro polishing is applied to all cavities. In this paper the treatment will be discussed and present results will be reported

TUPO066	Analysis of Recent Results from Second Sound, Temperature Mapping and Optical Inspection of 1.3 GHz Cavities at DESY	558
	F. Schlander, S. Aderhold, D. Reschke, K. Twarowski DESY, Hamburg, Germany
	DESY is preparing for the delivery of some 600 superconducting 9-cell cavities for the European XFEL. Analysing the history and recorded data of recently tested cavities gives important evidence for proper treatment, preparation and handling of cavities. The experience given by temperature mapping, the Second Sound technique and optical inspection will be compared and an overview of the results obtained so far will be given in this report.
	Poster TUPO066 [1.160 MB]

THPO031	Second Sound as an automated Quench Localisation Tool at DESY	785
	F. Schlander, E. Elsen, D. Reschke DESY, Hamburg, Germany
	Funding: This work is supported by the Commission of the European Communities under the 7th Framework Programme “Construction of New Infrastructures – Preparatory Phase”, contract number 206711. The understanding of local thermal breakdown (“quench“) in superconducting RF cavities is still a challenge. An easy way to find these heat spots is to measure the Second Sound in superfluid helium. This detection technique has been examined in several institutes. At DESY there are currently two vertical bath cryostats where cold RF tests with a cavity mounted in a cryostat insert can be done. At all of the four inserts the Second Sound setup consisting of eight Oscillating Superleak Transducers (OSTs) is mounted. These are connected to amplifier electronics and the measured signals are fed into an ADC to be read out with MATLAB. Within MATLAB the location is derived from the measured propagation times. The present system is already in use on a regular basis. An automated setup which will be implemented into the usual RF measurements is under development and the current status will be described.
	Poster THPO031 [0.550 MB]