Paper |
Title |
Other Keywords |
Page |
CT06 |
Developments and Plans for Diagnostics on the ISIS Synchrotron
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injection, diagnostics, synchrotron, resonance |
67 |
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- C.M. Warsop, D.J. Adams, K. Tilley
RAL, Rutherford Appleton Laboratory
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Developments of diagnostics on the 800 MeV High
Intensity Proton Synchrotron of ISIS, the Spallation
Neutron Source at the Rutherford Appleton Laboratory in
the UK, are described. Recent upgrades to instrumentation
and control computers have made much more information
readily available, which is valuable for control of a loss
limited, high intensity machine. Measurements on high
intensity beams have fundamental limitations in terms of
accuracy, detail and interpretation. However, it is found
that use of specially configured low intensity diagnostic
beams can provide much detailed information not
otherwise available, which is extremely valuable after
careful interpretation. The methods and systems being
developed to help trouble shooting, to find optimal
conditions rapidly and systematically, and to improve
understanding of high intensity performance are
described.
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CT11 |
The OTR Screen Betatron Matching Monitor of the CERN SPS
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injection, emittance, optics, scattering |
90 |
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- C. Bovet, R.J. Colchester, G. Ferioli, J.J. Gras, R. Jung, J.M. Vouillot
CERN, Geneva, Switzerland
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In order to satisfy the stringent emittance
requirements of LHC, betatron matching monitors,
based on multiturn beam profile measurements, have
been proposed for the SPS and LHC. A test monitor
has been installed for evaluation in the CERN SPS first
in 1996 and improved in 1997. It is based on an OTR
screen and a fast beam profile acquisition system. It
has been used with proton beams to assess the quality
of the betatron matching from the PS to the SPS in
1998. Experience and results are presented.
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PS02 |
Chromaticity Measurements at HERA-P Using the Head-Tail Technique with Chirp Excitation
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synchrotron, proton, pick-up, kicker |
103 |
|
- M. Wendt, F. Willeke
DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
- A. Boudsko
TRIUMF, Vancouver, Canada
- O.R. Jones, H. Schmickler
CERN, Geneva, Switzerland
|
Experiments have been performed in the HERA proton ring
(HERA-p) to test a quasi non-destructive method of chromaticity
measurements for protons. The method is based
on the detection of the head-tail phase shift of coherend betatron
oscillations using a broadband beam position pickup
and a commercial fast-frame oscilloscope. Previous experiments
have relied on a single kick for transverse excitation,
whereas the results presented here were carried out
using swept frequency chirp excitation. The tests proved
to be successful, and the method seems to be a good candidate
for chromaticity measurement in new large hadron
accelerators, such as LHC.
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PS06 |
Turn-By-Turn Phase Space Diagram Construction for Non-Linear Betatron Oscillation
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lattice, pick-up, synchrotron, simulation |
112 |
|
- A. Kalinin, V. Smaluk
BINP, Budker Institute of Nuclear Physics, Novosibirsk, Russia
|
The problem of phase space diagram construction for
non-linear betatron oscillation measured by pickup, is
considered. The conventional two-pickup method of
phase trajectory construction was improved. Discrete
Fourier filter applied to data measured yields a large
dividend in accuracy. The result of our investigations is
the method of turn-by-turn phase trajectory construction
using data measured by single pickup. The single-pickup
method developed was tested by computer simulation of
non-linear betatron oscillation in several models of
magnet lattice. Practicality of the method and its accuracy
limitation were studied. The method applying for
experimental study of beam dynamic is discussed.
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PT02 |
Real-time betatron tune measurement in the accelerator ramp at COSY-Jülich
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synchrotron, acceleration, diagnostics, feedback |
156 |
|
- J. Dietrich, I. Mohos
IKP, Forschungszentrum Jülich GmbH, Jülich, Germany
|
A new real-time method for betatron tune measurements
at COSY was developed and tested from the
early 1997. A bandlimited broadband noise source was
used for beam excitation, the transversal beam position
oscillation was bunch-synchronous sampled and digitized
with a high resolution ADC. The Fourier transform of the
acquired data represents immediately the betatron tune.
After the first promising experiments an automatic
tunemeter was constructed. The tunemeter is used as
routine diagnostic tool since end of 1998.
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PT19 |
A method for measurement of transverse impedance distribution along storage ring
|
impedance, pick-up, vacuum, storage-ring |
202 |
|
- V. Kiselev, V. Smaluk
BINP, Budker Institute of Nuclear Physics, Novosibirsk, Russia
|
A new method for measurement of transverse couple
impedance distribution along storage ring is described.
The method is based on measuring of a closed orbit
deviation caused by local impedance. Transverse
impedance acts on the beam as a defocusing quadrupole,
strength of which depends on the beam current. If a local
bump of closed orbit has been created at the impedance
location, then the orbit deviation occurs while varying
the beam current. The local impedance can be evaluated
using the orbit deviation measured. Measurement
technique is described, the method accuracy is
evaluated. The method described was successfully used
for measurement of the impedance distribution along the
VEPP-4M storage ring.
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