| Paper |
Title |
Page |
| IT03 |
Single Pass Optical Profile Monitoring
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10 |
| |
- R. Jung, G. Ferioli, S. Hutchins
CERN, Geneva, Switzerland
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Beam profiles are acquired in transfer lines to monitor extracted beams
and compute their emittance. Measurements performed on the first
revolutions of a ring will evaluate the matching of a chain of
accelerators. Depending on the particle type and energy, these
measurements are in general performed with screens, making either use of
Luminescence or OTR [Optical Transition Radiation], and the generated
beam images are acquired with detectors of various types: CCD, CMOS, CID,
TV Tubes or Multi-Anode Photo-Multipliers. The principles, advantages and
disadvantages of both families of screens will be discussed in relation
with the detectors used. A possible evaluation method for luminescent
screens and beam test results will be presented. Finally other optical
methods used will be mentioned for completeness.
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| PM11 |
Beam Studies Made With The SPS Ionization Profile Monitor
|
116 |
| |
- C. Fischer, G. Ferioli, J. Koopman, F. Roncarolo
CERN, Geneva, Switzerland
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During the last two years of SPS operation, investigations were pursued
on the ability of the SPS ionization profile monitor prototype to fulfill
different tasks. It is now established that the instrument can be used
for injection matching tuning, by turn to turn recording of the beam size
after the injection. Other applications concern beam size measurements on
beams ranging from an individual bunch to a nominal SPS batch foreseen
for injection into the LHC (288 bunches). By continuously tracking
throughout the SPS acceleration cycle from 26 GeV to 450 GeV the
evolution of parameters associated to the beam size, it is possible to
explain certain beam behavior. Comparisons are also made at different
beam currents and monitor gains with measurements made with the wire
scanners. Data are presented and discussed, and the possible
implementation of new features is suggested in order to further improve
the consistency of the measurements.
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| PT30 |
Ionisation Chambers for the LHC Beam Loss Detection
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245 |
| |
- E. Gschwendtner, R. Assmann, B. Dehning, G. Ferioli, V. Kain
CERN, Geneva, Switzerland
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At the Large Hadron Collider (LHC) a beam loss system will be used to
prevent and protect superconducting magnets against coil quenches and
coil damages. Since the stored particle beam intensity is 8 orders of
magnitude larger than the lowest quench level value particular attention
is paid to the design of the secondary particle shower detectors. The
foreseen ionisation chambers are optimised in geometry simulating the
probable loss distribution along the magnets and convoluting the loss
distribution with the secondary particle shower distributions. To reach
the appropriate coverage of a particle loss and to determine the quench
levels with a relative accuracy of 2 the number of the detectors and
their lengths is weighted against the particle intensity density
variation.
In addition attention is paid to the electrical ionisation chamber signal
to minimise the ion tail extension. This optimisation is based on time
resolved test measurements in the PS booster.
A proposal for a new ionisation chamber will be presented.
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