F. Saeidi

Low field low emittance lattice for the storage ring of Iranian Light Source Facility

According to the several submitted request proposals from the users to have high quality x-ray pulses, government of Iran has been convinced to build an intermediate energy 3 GeV synchrotron light source with several beamlines in Iran. To have a competitive leading position in the future, storage ring of Iranian Light Source Facility (ILSF) is designed to emphasize small emittance electron beam, great photon flux density, brightness, stability and reliability. In this paper, we present a possible low field lattice with low natural emittance of 0.93 nm.rad. The linear and nonlinear dynamic properties of lattice and the related beam dynamics issues have been discussed.

Recent Progress on the Development of Iranian Light Source Facility (ILSF) Project

The Iranian Light Source Facility Project (ILSF) is a 3rd generation light source with energy of 3 GeV, a full energy injector and a 150 MeV linac as pre-injector. The stored beam current in top up mode is 400 mA, the beam lifetime is about 7 h, and the average pressure of vacuum chamber is approximately 1.33 × 10 Pa (1 nTorr). The ILSF storage ring has been designed to be competitive in the future operation years. Some prototype accelerator components such as high power solid state radio frequency amplifiers, LLRF system, thermionic RF gun, storage ring H-type dipole and quadruple magnets, Hall probe system for magnetic measurement and highly stable magnet power supplies have been constructed in ILSF R&D laboratory. INTRODUCTION The construction of a synchrotron is an enterprise that requires international cooperation and very few countries are capable of carrying it out on their own. The synchrotron community is an international community with no borders and the synchrotron scientists share their knowledge and expertise openly and freely. The ILSF project has enjoyed this support from the beginning, in particular the technical groups of ILSF were trained by famous scientists in the field of accelerator. The ILSF conceptual design was completed under the direct supervision of several notable synchrotron scientists which advised ILSF for the completion of its conceptual design report, and various seminars have been conducted at IPM and ILSF with the participation of synchrotron scientists from around the world. The First Meeting of ILSF Machine Advisory Committee was held on 7-9 June 2015 at IPM. The goal was to receive a final approval for the design of the lattice of ILSF magnets and advice on the optimization of the next stages of the basic design of the ILSF synchrotron. On the basis of the previous design, the storage ring was based on a Five-Bend Achromat lattice providing a very low horizontal beam emittance of 480 pm-rad. The ring was consisting of 100 pure dipole magnets, 320 quadrupoles and 320 sextupoles. But now base on the new design which is the outcome of MAC meeting, its horizontal beam emittance reduced to 286 pm-rad. The major outcome of this meeting was some modification to bending magnets of storage ring in order to reduce the natural emittance to lowest value as 275 pm.rad, freezing the lattice design and entering to a new phase of project which is basic design. According to the plan, within 22 months (started from April 2016) more than 3200 technical documents will be provided and after that detail design and some procurements will begin to start. Figure 1 shows the distribution of documents for each discipline Figure1: Distribution of 3267 documents for ILSF basic design. STORAGE RING SPECIFICATIONS The new storage ring lattices consists of 20 five-bend achromats separated by 7 m straight sections for IDs. Each of the achromats consists of three unit cells and two matching cells. The unit cells have a 3.9° bending magnet, while the matching cells at the ends of the achromat have a 3.15° bending magnet. Three dimensional drawing view of one achromat. The matching cells contain dedicated quadrupole doublets in order to match the achromat optics to the ID in the straight sections. Since the vertical focusing is performed by the gradient dipoles, dedicated quadrupoles are, apart from ID matching; only required for horizontal focusing [1]. Main specifications of the designed ring and its optical functions in a super period are given in Table 1. ∗ Javad.rahighi@ipm.ir Proceedings of IPAC2016, Busan, Korea WEPOW017 02 Photon Sources and Electron Accelerators A05 Synchrotron Radiation Facilities ISBN 978-3-95450-147-2 2861 C op yr ig ht