• S.M. Gurov, M.F. Blinov, A.E. Levichev, E.B. Levichev, P. Martyshkin, I.N. Okunev, V.V. Petrov, S.I. Ruvinsky, T.V. Rybitskaya, A.V. Semenov, A.V. Sukhanov, P. Vobly
  BINP SB RAS, Novosibirsk
• E. Boter, D. Einfeld, M. Pont
  CELLS-ALBA Synchrotron, Cerdanyola del Vallès

BINP has manufactured and measured 243 multipoles of 9 types for the ALBA storage ring. The magnets had severe requirements on the manufacturing tolerances and the alignment of their magnetic axes. The quadrupole magnets are made of 1mm laminated yokes with the bore diameter of 61mm. The sextupole magnets are made of 0.5mm laminated yokes with the bore diameter of 76mm. Rotating coils and Hall probes have been used for the magnetic measurements. The features of manufacturing and magnetic measurements are presented in this paper.

• F. Forest, P. Bocher, B. Diougoant, T. Fevrier, J.L. Lancelot, M.J. Leray
  Sigmaphi, Vannes
• D. Einfeld, M. Pont
  CELLS-ALBA Synchrotron, Cerdanyola del Vallès

The paper presents the magnetic measurements of the 32 long dipoles and 8 short dipoles magnet manufactured by Sigmaphi for the ALBA synchrotron booster based in Spain. An extensive set of measurements based on search coils was made by Sigmaphi to characterize the magnetic field at different currents. This paper describes the magnetic measurements results. The measurements show the maximum field integral deviation between the magnets is within ± 3.10^-3 as expected.

• E. Al-Dmour, D. Einfeld, M.J. Grabski, R. Martin
  CELLS-ALBA Synchrotron, Cerdanyola del Vallès

The vacuum system of CELLS is in the installation stage. The booster vacuum chambers have been assembled and baked out in a provisional laboratory ex-situ in the ALBA building and in less than two months (starting from February) all the booster vacuum system was installed inside the tunnel and under vacuum. All the storage ring vacuum chambers have been delivered and ready for installation, several chambers were tested at CELLS (tests include vacuum tests, dimensional check, magnetic permeability tests…etc). All the tools needed for the assembly of the storage ring vacuum chambers have been delivered and tested at CELLS to validate the assembly procedure. Concerning the standard vacuum components; all the gauges and residual gas analyzers were delivered, all the ion pumps and controllers are at CELLS, the NEG pumps, leak detectors, roughing stations and the UHV valves were delivered too.

• M.L. Langlois, M. Cornelis, D. Einfeld, F. Peréz
  CELLS-ALBA Synchrotron, Cerdanyola del Vallès

The Dampy cavity, operating at 500 MHz and up to 160 kW, normal conducting HOM damped, will be used in the ALBA storage ring. The pre-series has shown two problems. First, the HOM damping is very efficient but for one mode. The longitudinal impedance of the E011 mode was found to be around 11 kΩ, slightly above ALBA stability threshold. Second, overheating close to the dampers flanges induces a vacuum leak after several thermal cyclings. The maximum achieved operational dissipated power is 40 kW, if power is further increased a leak opens at one of the dampers flanges. In order to alleviate this latter drawback, two modifications have been implemented in two different cavities. The pre-series has been provided with short-circuits bridging waveguide ridges and cavity body. These are supposed to decrease the current in the area of the flanges. The first production cavity features a reduced thermal impedance between the water cooling channels and the area of overheating by replacing stainless steel by copper in the critical area. Both these cavities are currently under test and this paper will show the results.

• D. Einfeld
  CELLS-ALBA Synchrotron, Cerdanyola del Vallès

ALBA is the first 3rd generation synchrotron light source to be build in Spain. The project is in the process of installation, with the LINAC already commissioned, and the Booster and Storage Ring in the installation phase, and the building already completed. The Booster synchrotron is expected to be finish and commission by the end of summer 2009, and the storage ring commissioning should take place in spring 2010. Most of the major components are already delivered and tested in-house, among those the vacuum system, the magnets, the RF cavities, etc. In this paper, the status of the project and of the most relevant components is reviewed.

• H. Hassanzadegan, R. Grino
  UPC, Barcelona
• D. Einfeld
  CELLS-ALBA Synchrotron, Cerdanyola del Vallès

The conventional electrical model analogy of a RF cavity is a shunt RLC circuit supplied by two current sources representing the RF amplifier and the beam. In the literature, the impedance of the cavity is often calculated in the Fourier domain. This type of cavity modelling has two drawbacks: First, it assumes a perfect matching between the cavity and the amplifier therefore it neglects the reflected voltage. And, second, it does not provide any information about the cavity transient response, for example at startup or upon beam arrival, while this information can be very important for the design of the regulation loops. In this work we will remove these drawbacks by calculating the cavity impedance in Laplace domain taking the reflected voltage into account. We will then modify our model so that it also includes the influence of the beam on the cavity. For transient RF simulations, though, a typical problem is the long simulation time due to the relatively slow transient response compared to the RF period. To overcome this problem, finally, we will use a mathematical method to map the cavity frequency response from RF to baseband to reduce the simulation time significantly.

• D. Zangrando, R. Bracco, B. Diviacco, D. La Civita, D. Millo, M. Musardo, G. Tomasin, R. Visintini
  ELETTRA, Basovizza
• F. Becheri, J. Campmany, C. Colldelram, D. Einfeld, J.V. Gigante, R. Ranz
  CELLS-ALBA Synchrotron, Cerdanyola del Vallès

Two variable polarization undulators have been designed and constructed as a Collaboration between CELLS and Sincrotrone Trieste*. In this paper the main magnetic and mechanical feature are summarized. Field optimization techniques are described, showing the achieved performance in terms of phase, trajectory and field integral errors.

*D.Zangrando et al. Design of two variable polarization undulators for the ALBA project, EPAC 2008, Genova, Italy

• G. Benedetti, D. Einfeld, J. Marcos, M. Muñoz, M. Pont
  CELLS-ALBA Synchrotron, Cerdanyola del Vallès

The ALBA booster is a 100 MeV-3 GeV ramping synchrotron, with large circumference of 249.6 m and low emittance of 9nm*rad, cycling at 3 Hz. The lattice consists of a 4-fold symmetric modified FODO lattice with defocusing gradient dipoles. Magnetic measurements on all magnets have been performed: the studies and lattice settings to recover the design optics preserving good machine performances, such as the lattice flexibility, the low beta functions and large dynamic aperture at high chromaticities, are presented.

• M. Muñoz, D. Einfeld, Z. Martí
  CELLS-ALBA Synchrotron, Cerdanyola del Vallès

The Spanish synchrotron light source ALBA is in the process of installation, with the large majority of components already manufactured and delivered. Among them, the magnets of the storage ring. As part of the acceptance process of the magnets, a campaign to measure the quality of them (magnetic length, effective bending and focusing, high order multipolar components) has been performed in-house and in the manufacturer. The results of this measures have been applied to the model of the storage ring, analyzing the effects in the performance (lifetime, dynamic aperture, orbit, etc). The results of the study confirm the quality of the magnet's design and manufacturing as well as the performance of the lattice.

• A.S. Setty, D. Jousse, J.-L. Pastre, F. Rodriguez
  THALES, Colombes
• G. Benedetti, D. Einfeld, A. Falone, U. Iriso, M. Muñoz, A. Olmos, F. Peréz, M. Pont, P. Sanchez
  CELLS-ALBA Synchrotron, Cerdanyola del Vallès
• A. Sacharidis
  EuroMev, Buc

A turn key 100 MeV linac was provided by THALES Communications in order to inject electrons into the booster synchrotron of ALBA*. The linac was commissioned in October 2008. This paper will remind the main features of the linac** and will give results obtained during the commissioning tests. The energy and emittance measurements have been done on the transfer line concieved and realized by CELLS. Specified and measured beam parameters will be compared to show the performance of the entire system.

* D. Einfeld "Progress of ALBA", EPAC08, Genoa, Italy, June 2008.
** A. Falone et Alt, "Status of the 100 MeV preinjector for the ALBA synchrotron", EPAC08, Genoa, Italy, June 2008.