2011 Particle Accelerator Conference - List of Authors (Jones, O.R.)

Paper

Title

Page

High Level Software for 4.8 Ghz LHC Schottky System

507

J. Cai, E.S.M. McCrory, R.J. Pasquinelli
Fermilab, Batavia, USA
M. Favier, O.R. Jones
CERN, Geneva, Switzerland
A. Jansson
ESS, Lund, Sweden
T.E. Lahey
SLAC, Menlo Park, California, USA

A high level software package has been developed for a 4.8GHz Schottky system installed in the LHC at CERN. It has two main components. The first is a monitor application continuously running on a dedicated server as a daemon process to acquire the FFT traces, perform data analysis, publish results and do archiving. The second is a graphical user interface to display the FFT traces and various measurement results. It also allows the end user to change the settings for the front-end electronics such as the local oscillators, bunch selector, amplifier gains etc. Data analysis with curve fitting poses a big challenge due to the strong coherent signals that are often observed superimposed onto the Schottky sidebands. A method has been successfully created to remove the coherent spikes to enable curve fitting on the underlying signals, with the ultimate aim of providing reliable tune, momentum spread, chromaticity and emittance measurements for LHC beams with no external excitation.

WEOBN6

LARP LHC 4.8 GHz Schottky System Initial Commissioning with Beam

1413

R.J. Pasquinelli
Fermilab, Batavia, USA
F. Caspers, O.R. Jones
CERN, Geneva, Switzerland
A. Jansson
ESS, Lund, Sweden

The LHC Schottky system consists for four independent 4.8 GHz triple down conversion receivers with associated data acquisition systems. Each system is capable of measuring tune, chromaticity, momentum spread in either horizontal or vertical planes; two systems per beam. The hardware commissioning has taken place during the spring and summer of 2010. With nominal bunch beam currents of 10¹¹ protons, the first incoherent Schottky signals were detected and analyzed. This paper will report on these initial commissioning results. A companion paper will report on the data analysis curve fitting and remote control user interface of the system.

Slides WEOBN6 [27.117 MB]

Paper	Title	Page
MOP218	High Level Software for 4.8 Ghz LHC Schottky System	507
	J. Cai, E.S.M. McCrory, R.J. Pasquinelli Fermilab, Batavia, USA M. Favier, O.R. Jones CERN, Geneva, Switzerland A. Jansson ESS, Lund, Sweden T.E. Lahey SLAC, Menlo Park, California, USA
	A high level software package has been developed for a 4.8GHz Schottky system installed in the LHC at CERN. It has two main components. The first is a monitor application continuously running on a dedicated server as a daemon process to acquire the FFT traces, perform data analysis, publish results and do archiving. The second is a graphical user interface to display the FFT traces and various measurement results. It also allows the end user to change the settings for the front-end electronics such as the local oscillators, bunch selector, amplifier gains etc. Data analysis with curve fitting poses a big challenge due to the strong coherent signals that are often observed superimposed onto the Schottky sidebands. A method has been successfully created to remove the coherent spikes to enable curve fitting on the underlying signals, with the ultimate aim of providing reliable tune, momentum spread, chromaticity and emittance measurements for LHC beams with no external excitation.

WEOBN6	LARP LHC 4.8 GHz Schottky System Initial Commissioning with Beam	1413
	R.J. Pasquinelli Fermilab, Batavia, USA F. Caspers, O.R. Jones CERN, Geneva, Switzerland A. Jansson ESS, Lund, Sweden
	The LHC Schottky system consists for four independent 4.8 GHz triple down conversion receivers with associated data acquisition systems. Each system is capable of measuring tune, chromaticity, momentum spread in either horizontal or vertical planes; two systems per beam. The hardware commissioning has taken place during the spring and summer of 2010. With nominal bunch beam currents of 10¹¹ protons, the first incoherent Schottky signals were detected and analyzed. This paper will report on these initial commissioning results. A companion paper will report on the data analysis curve fitting and remote control user interface of the system.
	Slides WEOBN6 [27.117 MB]