Paper |
Title |
Page |
MOPD04 |
Synchronisation of the LHC Betatron Coupling and Phase Advance Measurement System |
139 |
|
- J. Olexa, M. Gąsior
CERN, Geneva, Switzerland
|
|
|
The new LHC Diode ORbit and OScillation (DOROS) system will provide beam position readings with sub-micrometre resolution and at the same time will be able to perform measurements of local betatron coupling and beam phase advance with micrometre beam excitation. The oscillation sub-system employs gain-controlled RF amplifiers, shared with the orbit system, and followed by dedicated diode detectors to demodulate the beam oscillation signals into the kHz frequency range, subsequently digitized by multi-channel 24-bit ADCs. The digital signals are processed in each front-end with an FPGA and the results of reduced throughput are sent using an Ethernet protocol to a common concentrator, together with the orbit data. The phase advance calculation between multiple Beam Position Monitors (BPMs) requires that all DOROS front-ends have a common phase reference. This paper presents methods used to generate such a reference and to maintain a stable synchronous sampling on all system front-ends. The performance of the DOROS prototype synchronisation is presented based upon laboratory measurements.
|
|
Export • |
reference for this paper to
※ LaTeX,
※ Text,
※ IS/RefMan,
※ EndNote (xml)
|
|
|
WEPF18 |
Precise Digital Integration of Fast Analogue Signals Using a 12-Bit Oscilloscope |
584 |
|
- M. Krupa, M. Gąsior
CERN, Geneva, Switzerland
|
|
|
An accurate laboratory characterization of beam intensity monitors requires a reliable integration of analogue signals simulating beam pulses. This poses particular difficulties when a high integration resolution is necessary for short pulses. However, the recent availability of fast 12-bit oscilloscopes now makes it possible to perform precise digital integration of nanosecond pulses using such instruments. This paper describes the methods and results of laboratory charge measurements performed at CERN using a 12-bit oscilloscope with 1 GHz analogue bandwidth and 2.5 GS/s sampling.
|
|
Export • |
reference for this paper to
※ LaTeX,
※ Text,
※ IS/RefMan,
※ EndNote (xml)
|
|
|
WEPD01 |
Observations of the Quadrupolar Oscillations at GSI SIS-18 |
629 |
|
- R. Singh, P. Forck, P. Kowina
GSI, Darmstadt, Germany
- M. Gąsior
CERN, Geneva, Switzerland
- W.F.O. Müller, J.A. Tsemo Kamga, T. Weiland
TEMF, TU Darmstadt, Darmstadt, Germany
|
|
|
An asymmetric capacitive pick-up was installed at GSI SIS-18 for determination of the turn-by-turn beam quadrupole moment. The pick-up geometry is simulated to estimate its sensitivity towards the beam dipole and quadrupole moments. Turn-by-turn quadrupole moment measurement allows to calculate the frequency of beam-size oscillations. Recent beam measurements using this pick-up show clear indications of the beam-size oscillations induced by the injection mismatch. In this contribution, we present these measurements and discuss their relevance for the direct determination of the incoherent space charge tune shift.
|
|
|
Poster WEPD01 [3.589 MB]
|
|
Export • |
reference for this paper to
※ LaTeX,
※ Text,
※ IS/RefMan,
※ EndNote (xml)
|
|
|