BIW2012 - List of Authors (Jakoby, R.)

Paper	Title	Page
TUPG008	Coupling Methods for the Highly Sensitive Cavity Sensor for Longitudinal and Transverse Schottky Measurements	149
	M. Hansli, A. Angelovski, R. Jakoby, A. Penirschke TU Darmstadt, Darmstadt, Germany W. Ackermann, T. Weiland TEMF, TU Darmstadt, Darmstadt, Germany P. Hülsmann, W. Kaufmann GSI, Darmstadt, Germany
	Funding: Work supported by the BMBF: 06DA90351 In order to observe rare isotopes and anti-protons in the Collector Ring (CR) at FAIR, a highly sensitive Schottky cavity sensor is proposed, utilizing the monopole mode for longitudinal and a dipole mode for transverse measurements. Because the charged particle beam excites the dipole mode in the suggested resonator several orders of magnitude smaller than the corresponding monopole mode, it is crucial to extract both components independently without mutual correlation. Particular focus has to be put on the extraction of the dipole mode to sufficiently suppress the strong monopole contribution by taking advantage of a frequency selective coupling mechanism. Utilization of waveguide filters at the measurement frequency of about 300 MHz results in a bulky structure. To reduce the size, different methods for coupling and filtering including dielectric filling of the waveguides are evaluated in this work with respect to their Signal-to-Interference-and-Noise-Ratio. Hereby, key parameters that influence the performance, namely, the shunt impedance of the dipole mode, the suppression of the monopole mode, and the noise behavior of the system are systematically analyzed and optimized.

Paper

Title

Page

Coupling Methods for the Highly Sensitive Cavity Sensor for Longitudinal and Transverse Schottky Measurements

149

M. Hansli, A. Angelovski, R. Jakoby, A. Penirschke
TU Darmstadt, Darmstadt, Germany
W. Ackermann, T. Weiland
TEMF, TU Darmstadt, Darmstadt, Germany
P. Hülsmann, W. Kaufmann
GSI, Darmstadt, Germany

Funding: Work supported by the BMBF: 06DA90351
In order to observe rare isotopes and anti-protons in the Collector Ring (CR) at FAIR, a highly sensitive Schottky cavity sensor is proposed, utilizing the monopole mode for longitudinal and a dipole mode for transverse measurements. Because the charged particle beam excites the dipole mode in the suggested resonator several orders of magnitude smaller than the corresponding monopole mode, it is crucial to extract both components independently without mutual correlation. Particular focus has to be put on the extraction of the dipole mode to sufficiently suppress the strong monopole contribution by taking advantage of a frequency selective coupling mechanism. Utilization of waveguide filters at the measurement frequency of about 300 MHz results in a bulky structure. To reduce the size, different methods for coupling and filtering including dielectric filling of the waveguides are evaluated in this work with respect to their Signal-to-Interference-and-Noise-Ratio. Hereby, key parameters that influence the performance, namely, the shunt impedance of the dipole mode, the suppression of the monopole mode, and the noise behavior of the system are systematically analyzed and optimized.