BIW2012 - List of Authors (Gasior, M.)

Paper

Title

Page

Faraday Cup Award: High Sensitivity Tune Measurement using Direct Diode Detection

1

M. Gasior
CERN, Geneva, Switzerland

Direct Diode Detection combined with high resolution digitisers is a technique developed at CERN, originally for the LHC tune measurement system, to reach a sensitivity that allows the observation of beam oscillations with amplitudes in the micrometre range. In this technique simple peak diode detectors are used to convert short beam pulses from a beam position monitor into slowly varying signals. Their DC part, constituting a large background related to beam offsets, is suppressed by series capacitors, while the small signals related to beam oscillations are passed to the following stages for amplification and filtering. As the demodulated beam oscillation signals are already in the kHz range, their processing is easily done with high resolution audio ADCs. This contribution presents the principles of the 3D technique and focuses on the history and the adventures of the 3D development and prototyping. It documents a very efficient collaboration between CERN and Brookhaven National Laboratory, with contributions from several other international laboratories.

Slides MOAP02 [8.429 MB]

MOPG010

BPM Electronics Based on Compensated Diode Detectors - Results from Development Systems

44

M. Gasior, J. Olexa, R.J. Steinhagen
CERN, Geneva, Switzerland

High resolution beam position monitor (BPM) electronics based on diode peak detectors are being developed for processing signals from BPMs embedded into the future LHC collimators. Prototypes of such systems have been tested both in the laboratory and with beam signals from regular CERN-LHC BPMs and a collimator BPM installed in the CERN-SPS. Results from all these measurements are presented and discussed.

Poster MOPG010 [0.334 MB]

TUPG044

First Results from the LHC Schottky Monitor Operated with Direct Diode Detection

222

M. Gasior
CERN, Geneva, Switzerland

The LHC is equipped with a Schottky diagnostic system based on 4.8 GHz travelling wave pick-ups. Their signals are processed with a three-stage down-mixing scheme, which is primarily intended for non invasive bunch by bunch tune measurement. This works well during periods of stable beam operation, but is often perturbed by the coherent part of the beam spectrum during the energy ramp. To study the beam spectrum in such conditions the signals from the Schottky pick-ups were split at the tank output to allow parallel processing with slightly modified LHC tune measurement hardware, based on simple diode detectors followed by signal processing in the kHz range using 24-bit audio ADCs. With such a test system LHC beam spectra were successfully observed, with this contribution presenting the results obtained.

Poster TUPG044 [0.434 MB]

Paper	Title	Page
MOAP02	Faraday Cup Award: High Sensitivity Tune Measurement using Direct Diode Detection	1
	M. Gasior CERN, Geneva, Switzerland
	Direct Diode Detection combined with high resolution digitisers is a technique developed at CERN, originally for the LHC tune measurement system, to reach a sensitivity that allows the observation of beam oscillations with amplitudes in the micrometre range. In this technique simple peak diode detectors are used to convert short beam pulses from a beam position monitor into slowly varying signals. Their DC part, constituting a large background related to beam offsets, is suppressed by series capacitors, while the small signals related to beam oscillations are passed to the following stages for amplification and filtering. As the demodulated beam oscillation signals are already in the kHz range, their processing is easily done with high resolution audio ADCs. This contribution presents the principles of the 3D technique and focuses on the history and the adventures of the 3D development and prototyping. It documents a very efficient collaboration between CERN and Brookhaven National Laboratory, with contributions from several other international laboratories.
	Slides MOAP02 [8.429 MB]

MOPG010	BPM Electronics Based on Compensated Diode Detectors - Results from Development Systems	44
	M. Gasior, J. Olexa, R.J. Steinhagen CERN, Geneva, Switzerland
	High resolution beam position monitor (BPM) electronics based on diode peak detectors are being developed for processing signals from BPMs embedded into the future LHC collimators. Prototypes of such systems have been tested both in the laboratory and with beam signals from regular CERN-LHC BPMs and a collimator BPM installed in the CERN-SPS. Results from all these measurements are presented and discussed.
	Poster MOPG010 [0.334 MB]

TUPG044	First Results from the LHC Schottky Monitor Operated with Direct Diode Detection	222
	M. Gasior CERN, Geneva, Switzerland
	The LHC is equipped with a Schottky diagnostic system based on 4.8 GHz travelling wave pick-ups. Their signals are processed with a three-stage down-mixing scheme, which is primarily intended for non invasive bunch by bunch tune measurement. This works well during periods of stable beam operation, but is often perturbed by the coherent part of the beam spectrum during the energy ramp. To study the beam spectrum in such conditions the signals from the Schottky pick-ups were split at the tank output to allow parallel processing with slightly modified LHC tune measurement hardware, based on simple diode detectors followed by signal processing in the kHz range using 24-bit audio ADCs. With such a test system LHC beam spectra were successfully observed, with this contribution presenting the results obtained.
	Poster TUPG044 [0.434 MB]