• C. Jahnke, A.A. Malafronte, M.N. Martins, T.F. Silva, V.R. Vanin
  USP/LAL, Sao Paulo

Funding: FAPESP, CNPq

The IFUSP Microtron transport line guides the 5 MeV electron beam from the booster to the main microtron, where it can be accelerated up to 38 MeV in steps of 0.9 MeV. A few meters after leaving the main microtron, the beam is guided to the experimental hall, which is located 2.7 m below the accelerator room. The beam leveling is made by two 90° bending magnets. In the experimental hall there is a switching magnet to drive the beam to two different experimental lines. Each of these lines has another 90° bending magnet. These magnets were designed, constructed and characterized. In this work we present the analysis of the field distribution of these 90° bending magnets. Comparison between field simulation and data from field mapping is presented. We also present a reproducibility analysis where the field distributions of two twin magnets are presented.

• A. Kaftoosian, D.S. Foudeh, A. Nadji
  SESAME, Amman

Funding: SESAME (Synchrotron light-source for Experimental Science and Applications in the Middle-East) Allan, Jordan

The SESAME (Synchrotron light source for Experimental Science and Applications in the Middle-East) accelerator consists of a 22MeV Microtron, an 800MeV booster synchrotron and a 2.5GeV storage ring. Each accelerator has its own RF system. The Microtron RF frequency is 3GHz generated by a 2MW pulsed Magnetron while the booster and storage ring have a common 500MHz CW RF source. The Booster RF system consists of a DORIS cavity fed by a 2kW CW solid-state RF amplifier but the storage ring (SR) RF system has been designed based on four 500 MHz plants, each comprising a normal conducting (NC) single-cell cavity , powered with 140 kW (CW) by two combined 80kW IOTs to have maximum possible RF power in the cavity via a WR1800 waveguide line. In the initial phase, it has been decided to start with two ELETTRA type cavities and in final phase, four cavities will be accommodated in one straight section in the storage ring to have nominal energy and current in the machine. This paper presents status of installed Microtron RF system and modified booster RF system from BESSY I, as well as designed SESAME storage ring high power RF system and low level electronics.

• A. Nadji
  SOLEIL, Gif-sur-Yvette
• T.H. Abu-Hanieh, A. Al-Adwan, M.A. Al-najdawi, A. Amro, M. Attal, S. Budair, D.S. Foudeh, A. Hamad, A. Kaftoosian, T.A. Khan, F. Makahleh, S.A. Matalgah, M. Sbahi, M.M. Shehab, H. Tarawneh, S. Varnasseri
  SESAME, Allan

SESAME is a 3rd generation synchrotron light source facility under construction in Allan, Jordan, 30 km North-West of Amman. SESAME consists of a 2.5 GeV storage ring, a 22.5 MeV Microtron and an 800 MeV Booster. The Microtron was installed at its final position and its subsystems have been successfully tested. The commissioning with beam of the Microtron will start in March 2009. The installation of the Booster is expected to take place in summer 2009. Most of the storage ring subsystems are ready for call for tender. The progress of SESAME project including beamlines status will be reported in this paper.

• A. Jankowiak, K. Aulenbacher, O. Chubarov, M. Dehn, H. Euteneuer, R.G. Heine, P. Jennewein, H.-J. Kreidel, U. Ludwig-Mertin, O. Ott, G.S. Stephan, V. Tioukine
  IKP, Mainz

Funding: Work supported by DFG (CRC443) and the German Federal State of Rheinland-Pfalz

In December 2006 the maximum output energy of the cw race track microtron cascade MAMI B was increased to 1508MeV by the successful commissioning of the world wide first Harmonic-Double-Sided-Microtron (HDSM)* as a new fourth stage. Since then MAMI C was in operation for more than 15000 hours, delivering approx. 10000 hours the maximum beam energy of 1508MeV. We will report about our operational experiences and the recent machine developments concerning e.g. the increase of the energy and stabilisation of the output energy down to 10^-6. Topics of machine reliability and stability will be addressed and the operation under different demands of nuclear physics experiments described.

*K.-H. Kaiser et al., NIM A 593 (2008) 159 - 170, doi:10.{10}16/j.nima.2008.05.018

• M. Dehn, H. Euteneuer, A. Jankowiak
  IKP, Mainz

Funding: Work supported by DFG (CRC 443) and the German Federal State of Rheinland-Pfalz.

The 1.5GeV Harmonic Double Sided Microtron (HDSM)* as the fourth stage of the Mainz Microtron (MAMI) is now in routine operation for two and a half years**. Simulations predicted a wide range of applicable longitudinal parameters with which the machine can be run. Measurements of the longitudinal acceptance proved that. The reproducibility of different configurations is sufficient to support a fast and reliable set-up of the machine and to guarantee a stable long-term operation. But in order to optimise the configuration a reliable measurement of the phases and accelerating voltages in both linacs is essential. Each turn’s phase information is provided by low-Q-TM010 resonators at both linacs when operating the machine with 10ns diagnostic pulses. The HDSM’s four bending magnets are designed with a field gradient to compensate the vertical fringe defocusing. The decreasing field integral results in less synchronous energy gain per turn, automatically causing a change of the longitudinal phase. The calibration of the phase signals which in case of the RTMs could be easily done by exciting a synchrotron oscillation was improved to deliver precise phase data.

*K.-H. Kaiser et al., NIM A 593 (2008) 159 - 170, doi:10.{10}16/j.nima.2008.05.018
**A. Jankowiak et al., ID 2689, this conference

• T.F. Silva, R. Lima, A.A. Malafronte, M.N. Martins, A.J. Silva, V.R. Vanin
  USP/LAL, Sao Paulo

Funding: FAPESP, CNPq

In this work we describe the design of the OTR monitors that will be used to measure beam parameters of the IFUSP Microtron electron beam. The OTR monitor design must allow for efficiency in the entire energy range (from 5 MeV up to 38 MeV in steps of 0.9 MeV), and the devices are planed to monitor charge distribution, beam energy and divergence. An exception is made for the OTR monitor to the 1.7 MeV beam line, which is to be used to monitor only the beam charge distribution at the exit of the linac injector. The image acquisition system is also presented.

• T.F. Silva, A.L. Bonini, C. Jahnke, R. Lima, M. Lucena, A.A. Malafronte, M.N. Martins, L. Portante, A.J. Silva, V.R. Vanin
  USP/LAL, Sao Paulo

Funding: FAPESP, CNPq

The Instituto de Física da Universidade de São Paulo (IFUSP) is building a two-stage 38 MeV continuous wave racetrack microtron. This accelerator consists of a linac injector that delivers a 1.7 MeV beam to a microtron (booster) with 5 MeV exit energy. A transport line guides the beam to the main microtron to be accelerated to energies up to 38 MeV in steps of 0.9 MeV. This work describes the commissioning of the linac injector that comprises the first two accelerating structures of the IFUSP Microtron. A provisional beam line was built at the end of the linac to provide energy and current measurements. We also present results concerning RF power, RF phase, and temperature control of the accelerating structures. The first results of the chopper and buncher systems are also presented.