Abstracts Brochure - CERN

THPLS — Poster Session 29-Jun-06 16:00 - 18:00
will review the performances of all these equipment in presence of the beam. The results of the first commissioning
runs will be presented.
Metrology for the Beam Emittance Measurement of the SOLEIL Injector
The injector system of SOLEIL is composed
of a 100 MeV electron linac pre-accelerator M.-A. Tordeux, Y.-M. Abiven, N.L. Leclercq, D. Pedeau (SOLEIL)
followed by a full energy 2.75 GeV booster
synchrotron, operating at 3 Hz. Dedicated diagnostics such as emittance monitors are installed on the two transfer
lines between the linac and the booster and between the booster and the storage ring. The measurement is performed
using the gradient method, relying on YAG screens and high resolution CCD cameras. This paper will show the
metrology of the emittance measurements which were made for the HELIOS (THALES) iinac beam (total emittance
in the range of 1 µm.rad) and for the booster beam (rms emittance ∼ 150 nm.rad): error sources are identified and
specific corrections are shown. Additional analysis of the dynamics of the injection into the booster and into the
storage ring is made for a deeper characterization.
Operation and Recent Development at the ESRF
We report on the achieved performance of
the ESRF storage ring as well as developments
accomplished or underway. A new hybrid
filling mode based on groups of bunches
J.-L. Revol, J. Chavanne, P. Elleaume, L. Farvacque, L. Hardy, J.
Jacob, G.A. Naylor, E. Plouviez, A. Ropert, K.B. Scheidt (ESRF)
and a 4-bunch filling pattern are now delivered to the users. Following the increasing demand of users for beam
stability, the fast orbit feedback has been upgraded. The installation of 5 m-long, 8 mm vertical aperture NEG coated
aluminum chambers is progressing at a rate of one chamber per shutdown. The increase in current from 200 to 300
mA is being prepared; however, operation in this mode is still impaired by HOM driven longitudinal instabilities. To
overcome this difficulty, a longitudinal feedback is being commissioned. HOM damped cavities are also under study
to possibly replace the existing five-cell cavities. The policy of preventive maintenance has been continued. However,
in 2005 the machine availability was affected by water leaks occurring on front-end absorbers and on one dipole
crotch absorber. The crotch absorbers suffer all from the same erosion process that could be delayed by a systematic
vertical realignment, leaving time for procurement and replacement of the entire pool.
Commissioning of the Australian Synchrotron Injector RF Systems
On December 16, 2003 the contract for the design,
manufacture, installation and commissioning
of the turnkey injector system for the
Australian Synchrotron Project was awarded
C. Piel, K. Dunkel, J. Manolitsas, D. Trompetter, H. Vogel (ACCEL)
M.J. Boland, R.T. Dowd, G. LeBlanc, M.J. Spencer, Y.E. Tan (ASP)
to industry. ACCEL Instruments is delivering the turnkey 100MeV linac and the booster RF system. Commissioning
of the linac for ASP was performed in December 2005, right after successful commissioning of the Diamond Light
Source injection linac*. The 500MHz booster cavity and related low level RF system will be commissioned after
installation of the booster is finalised in early 2006. The paper will present design and layout information, as well as
commissioning results.
*Commissioning of the Diamond Pre-Injector Linac (this conference).
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