| Paper |
Title |
Other Keywords |
Page |
| PM12 |
The SPS Individual Bunch Measurement System
|
instrumentation, diagnostics, pick-up, controls |
192 |
| |
- A. Guerrero, H. Jakob, J.J. Savioz, R. Jones
CERN, Geneva, Switzerland
| |
The Individual Bunch Measurement System (IBMS)
allows the intensity of each bunch in an LHC batch to be
the measured both in the PS to SPS transfer lines and in
the SPS ring itself. The method is based on measuring the
peak and valley of the analogue signal supplied by a Fast
Beam Current Transformer at a frequency of 40MHz. A
12 bit acquisition system is required to obtain a 1 %
resolution for the intensity range of 5×109 to 1.7×1011
protons per bunch, corresponding to the pilot and ultimate
LHC bunch intensities. The acquisition selection and
external trigger adjustment system is driven by the
200MHz RF, which is distributed using a single-mode
fibre-optic link. A local oscilloscope, controlled via a
GPIB interface, allows the remote adjustment of the
timing signals. The low-level software consists of a realtime
task and a communication server run on a VME
Power PC, which is accessed using a graphical user
interface. This paper describes the system as a whole and
presents some recent uses and results from the SPS run in
2000.
|
|
|
|
| PM13 |
Control Modules for Scintillation Counters in the SPS Experimental Areas
|
instrumentation, diagnostics, controls, beam-transport |
195 |
| |
- G. Baribaud, C. Beugnet, A. Cojan, G.P. Ferri, J. Fullerton, A. Manarin, J. Spanggaard
CERN, Geneva, Switzerland
| |
The hardware used in the SPS Experimental Areas to control the beam
instrumentation electronics and mechanics of the particle detectors is
based on CAMAC and NIM modules. The maintenance of this hardware now
presents very serious problems. The modules used to operate the
Experimental Areas are numerous and older than 20 years so many of them
cannot be repaired any more and CAMAC is no longer well supported by
industry. The fast evolution of technology and a better understanding of
the detectors allow a new equipment-oriented approach, which is more
favourable for maintenance purposes and presents fewer data handling
problems. VME and IP Modules were selected as standard components to
implement the new electronics to control and read out the particle
detectors. The first application implemented in this way concerns the
instrumentation for the Scintillation Counters (formerly referred to as
triggers). The fundamental options and the design features will be
presented.
|
|
|
|
| PM15 |
Sensitivity Studies with the SPS Rest Gas Profile Monitor
|
instrumentation, diagnostics, emittance |
201 |
| |
- G. Ferioli, C. Fischer, J. Koopman, M. Sillanoli
CERN, Geneva, Switzerland
| |
During the SPS run in the year 2000 further test
measurements were performed with the rest gas monitor.
First, profiles of single circulating proton bunches were
measured and the bunch charge progressively reduced, in
order to determine the smallest bunch intensity which can
be scanned under the present operating conditions. The
image detector in this case was a CMOS camera.
Using a multi-anode strip photo-multiplier with fast
read-out electronics, the possibility to record profiles on a
single beam passage and on consecutive turns was also
investigated. This paper presents the results of these tests
and discusses the expected improvements for the
operation in 2001.
Moreover, the issue of micro channel plate ageing
effects was tackled and a calibration system based on
electron emission from a heating wire is proposed. The
gained experience will be used for the specification of a
new monitor with optimised design, to be operated both in
the SPS and in the LHC.
|
|
|
|