Abstracts Brochure - CERN

TUPCH — Poster Session 27-Jun-06 16:00 - 18:00
Modelling of Diagnostics for Space Charge Studies on the ISIS Synchrotron
The ISIS Facility at the Rutherford Appleton
Laboratory in the UK produces intense neu- B.G. Pine, S.J. Payne, C.M. Warsop (CCLRC/RAL/ISIS)
tron and muon beams for condensed matter
research. It is based on a 50 Hz proton synchrotron which, once the commissioning of a new dual harmonic RF
system is complete, will accelerate about 3.5·10 13 protons per pulse from 70 to 800 MeV, corresponding to mean beam
powers of 0.2 MW. Transverse space charge is a key issue for both present and proposed upgrades to the machine, and
is the focus of current R&D studies. Experiments on the ISIS ring are central to this work, therefore understanding
and quantifying limitations in present and proposed diagnostics is essential. This paper presents work studying and
modelling the ISIS residual gas profile monitors, including the effects of non-uniformity in sweep fields, space charge
and images. Progress on related work looking at other important diagnostics, e.g., position and envelope monitoring,
will also be summarised.
Development of Emittance Scanner Software on ISIS
Horizontal and vertical Faraday cup and slit
scanners are used on ISIS, the 800MeV pulsed C.M. Thomas (CCLRC/RAL/ISIS)
neutron source at the Rutherford Appleton
Laboratory, to calculate the emittance of the beam. Software has been written in C++ to control the scanners, acquire
and display beam data and compute an emittance value for the beam. The software allows the user more control, and
has the ability to scan over a wider range, than was previously available.
A Phase Space Tomography Diagnostic for Pitz
The Photo Injector Test Facility at DESY in
Zeuthen (PITZ) is a European collaboration
developing RF photocathode electron guns
for light source and linear collider projects.
D.J. Holder, B.D. Muratori (CCLRC/DL/ASTeC) S. Khodyachykh,
A. Oppelt (DESY Zeuthen)
As part of the collaborative work being partially funded by the EU’s FP6 programme, CCLRC Daresbury Laboratory
and DESY are designing and building a phase space tomography diagnostic based on a set of multiple quadrupoles
and view screens. In order to measure the beam emittance, four screens with intermediate quadrupole doublets
will be used. The equipment will be installed and tested at PITZ as part of the facility upgrade presently ongoing.
Following simulations of the gun using the ASTRA code at a range of energies, simulations of the electron beam
parameters through the matching and tomography sections must be undertaken in order to specify the optimum
arrangement of magnets and screens.
A Digital Oscilloscope-based BPM for High Rate Bunch-by-bunch Measurements
This BPM is designed for bunch rate of
360MHz. The oscilloscope sampling inter- A. Kalinin (CCLRC/DL/ASTeC)
val is 0.2ns. The BPM is based on a sumdifference
hybrid junction. To convert a pair of pickup short pulses into a signal suitable for digitising, and to avoid
cross talk between bunches, an irregular coupler is used as a filter forming a signal without a lasting tail. To obtain
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