An electron lens - a novel instrument in accelerator physics to manipulate hadron beams with a magnetically confined electron beam - is under development at GSI, Darmstadt. It will be used to compensate the ion beam's space charge by an overlapping electron beam and therefore may help to increase the intensity of primary beams in the synchrotron SIS18 for FAIR. The main element of the lens is a solenoid with the longitudinal magnetic field of Bz = 600 mT and the requirements to the field homogeneity of Delta B/B less than +/- 5 x 10(-4) relative units. The magnetic field in the solenoid will be ramped with the rate of up to 20 T/s. Acceptable geometry of the solenoid has been found by optimization of the coil parameters and the iron shield geometry. For this purpose we have combined the 2D finite element technology for the magnetic field modeling and the Nelder-Mead optimization strategy. Thorough investigation of the solenoid 3D model confirmed a quality and feasibility of the developed magnetic system.

Search coils are used for fast and reliable measurements of field integrals as well as integral homogeneities of dipole magnets. A long experience exists at GSI Helmholtzzentrum für Schwerionenforschung (GSI) using search coils in series measurements of synchrotron dipoles as well as measurements of dipoles with large deflecting angles. The biggest advantage of this technique is a direct and fast measurement of the field integral. Current technology, however, always required a dedicated coil for each bending radius and length. A prominent example is High Energy Beam Transfer (HEBT) of the Facility for Antiproton and Ion Research (FAIR) project with 6 different radii between 4.5 m and 167 m. In addition to the 6 coils, radius dependent moving and guiding systems are necessary. To overcome the above mentioned drawbacks we developed a modular search coil system with adjustable radius including the support and movement system. The features of the system and measurement results are presented.

The radioactive dose rate in the area behind the target of the Super-Fragmentseparator (Super-FRS) will be so high that most organic materials will be destroyed in a short period of time. After 20 years of operation, an accumulated dose of more than 280 MGy is expected at the most critical parts. Special magnets consisting of radiation resistant materials must be used. Three dipoles, three quadrupoles, and two sextupoles are required inside the target area. One prototype of a radiation resistant dipole already exists. This paper presents the design, installation analysis and tests carried out with the challenges encountered towards realization of the radiation resistant magnets to be employed in future.

The extraction line of the future synchrotron SIS100 will have a series of three normal-conducting magnetic septa which deflect the beam upwards. Underneath the third septum there will be a beam stop for emergency extraction. Therefore, the entire region will be very likely activated with anticipated doses that forbid manual installation of a heating jacket. A mechanism which would automatically open this third septum and install a heating box proved too big during mechanical design studies. Therefore it has been decided to include the heating jacket into the septum. This significantly reduced the space for the magnetic screen to protect the orbit region from stray field. We will present the successful methods, and some less efficient ones, which we used to get an acceptable protection of the orbit against stray fields.

The Alvarez 2.0 DTL will be the new post-stripper DTL of the UNILAC at GSI. The existing GSI with its LINAC and SIS18 comprise the main operation injector chain for the Facility for Antiproton and Ion Research FAIR. The new Alvarez-DTL has an operation frequency of 108.4 MHz, an input energy of 1.358 MeV/u and the output energy is 11.4 MeV/u with a total length of 55 m. The presented FoS section will be part of the first cavity of the Alvarez 2.0 DTL. The FoS-cavity with 11 drift tubes (including quadrupole singlets) and a total length of 1.9 m will be copper plated in GSI for high power tests. The design of the quadrupole singlet magnet is finalized; a prototype of a fully functional magnet with drift tube and stems will be fabricated within a design study. Empty drift tubes and all components of the tank shall be delivered 2019 for first low level RF investigations.

The future heavy ion synchrotron SIS100 will have a series of two dc magnetic septa for the injection and three dc septa on the extraction line. The extraction line will allow for two different extraction schemes for vertical fast extraction and initially horizontal slow extraction. The latter requires, among other components, two additional Lambertson-type septa. The design of the magnets had to account not only for creating a high field with a narrow septum width, but also had to find way of providing bakeout jackets while limiting the technicians' exposure to radiation. Another issue was to minimize the chance of failure, e.g., by limiting the number of soldered joints with contact to the cooling channels and by reducing the current density with help of wedge-shaped conductors. The injection septa are under construction while some design work is still in progress for the extraction septa. We will present some of our solutions and concepts.

The SIS100 is a charged particle accelerator developed as a part of the challenging international project Facility for Anti-proton and Ion Research taking place in Darmstadt, Germany. The ion optics of the SIS100 accelerator includes superconducting and normal conducting quadrupole magnets. To fulfill the requirements of the field quality in the magnet aperture, it is necessary to find an optimal pole tip shape as well as an optimal configuration of the coil system. Requirements for radiation resistant magnets installed in the extraction section of the SIS100 accelerator combine high quality of the field distribution, maximum field intensity at the pole tip of more than 1.3 T, and a wide range of the flux density variation. We used a specially developed optimization procedure for designing the magnet cross section. The pole border line is described by a superposition of hyperbolic functions corresponding to different Fourier components of the magnetic field expansion. Strong correlation between amplitudes of the pole shape and field harmonics enables high performance of the optimization algorithms. The developed procedures have been used for designing a quadrupole magnet with especially wide range of the flux density variation. Integral 3-D properties of the developed quadrupoles were ensured by optimization of the magnet end chamfers.

To provide the primary proton beam for the FAIR antiproton research program, a 70 MeV, 70 mA linac is currently under design & construction at GSI. The nc machine comprises an ECR source, a 3 MeV RFQ, and a DTL based on CH-cavities. Up to 36 MeV pairs of rfcoupled cavities (CCH) are used. A prototype cavity has been built and is prepared for high power rf-testing. An overview of the status as well as on the perspectives of the project is given.

A gamma transition jump scheme has been developed for the heavy ion synchrotron SIS100 to modify the gamma transition during the acceleration of protons in such a way that the speed at which the relativistic gamma of the beam crosses the transition gamma is increased by two orders of magnitude. The transition crossing will be at gamma = 8.9, which corresponds to a kinetic proton energy of 7.4 GeV and a beam rigidity of about 28 Tm. The scheme employs fast-ramped quadrupoles with a ramping time of 0.5 ms from the maximum integral gradient of 0.4 T to the minimum integral gradient of minus 0.4 T. Each of the 12 fast ramped quadrupoles is embedded inside the cryostats of the so-called quadrupole doublet modules together with two main superconducting quadrupoles and one corrector magnet. The vacuum chamber, coils, and iron yoke are cooled with liquid helium. Nevertheless, the coils are made of standard copper tubes with a residual resistivity ratio of approximately 100 to avoid quench problems due to the fast ramping. The requirements and design of these normal conducting magnets inside the cryogenic environment are described.

The collector ring (CR) is a part of the challenging international project facility for antiproton and ion research started in Darmstadt, Germany. The ion optics of the CR includes sextupole magnets with embedded dipole correction coils. To fulfill the requirements of the field quality in the magnet aperture, it is necessary to find an optimal pole tip shape as well as an optimal configuration of the coil system. We used a specially developed optimization procedure for designing the magnet cross section. This procedure consists of two steps. The first one is based on a representation of the pole border line by a superposition of hyperbolic functions corresponding to different Fourier components of the magnetic field expansion. The optimization procedure based on the Newton-Raphson descend algorithm minimizes amplitudes of the undesired field harmonics. At the second step of the magnet design procedure, the parameters of the dipole winding are optimized to provide the required field characteristics in the magnet aperture.

SIS100 is the main accelerator of the FAIR project. It is a worldwide unique heavy ion synchrotron dedicated to accelerate highest intensities of intermediate charge state heavy ionand proton beams up to 100 Tm. From the technical point of view, most challenging issues are the fast ramped superconducting magnets and the acceleration of intense, intermediate charge state heavy ions beams. The latter required a unique lattice design (charge separator lattice) in combination with an ultrahigh vacuum system based on distributed cryo-pumping with actively cooled magnet chambers, adsorption pumps and dedicated cryo-catchers for local suppression of gas desorption [1].

The FAIR synchrotron SIS100 which is under construction will provide heavy ion and proton beams of high intensity with fast and slow extraction. All extraction devices, including an internal emergency beam dump system, are installed within one straight section. This way, expected systematic beam loss is kept in a relatively small area of the synchrotron. In this area, it is rather challenging to protect components against high radiation fields, to keep XHV conditions, and to allow for maintenance of highly activated components to assure reliable beam operation. In this contribution, the technical measures to fulfill the requirements for the extraction straight section of SIS100 will be presented. These include remote controlled devices to move apart magnet yokes for the purpose of placing beam pipe heater; dedicated star-shaped vacuum chambers with integrated collimators and NEG-panels to reduce pressure bumps due to lost particles behind the electrostatic septa; a highpower multi-stage vertical extraction septum including a variable horizontal deflection.

The Collector Ring (CR) is a part of the challenging international project Facility for Anti-proton and Ion Research (FAIR) started in Darmstadt, Germany. The ion optics of the CR includes quadrupole magnets with an elliptical aperture and embedded octupole correction coils. To fulfill the requirements of the field quality in the magnet aperture, it is necessary to find an optimal pole tip shape as well as an optimal configuration of the coil system. We used a specially developed optimization procedure for designing the magnet cross-section. This procedure is based on a representation of the pole border line by a superposition of hyperbolic functions corresponding to different Fourier components of the magnetic field expansion. The goal function of the optimization minimizes amplitudes of the undesired field harmonics, and the Newton-Raphson method is applied to find a solution of the problem. We combined the described optimization procedure with the finite element method of the magnetic field computation and applied the developed algorithm as well as the corresponding computer program for optimizing the pole tip shape and the configuration of the coil system in the quadrupole magnets of the FAIR CR.

In order to improve the injection efficiency of the round UNILAC heavy ion beam into the asymmetric acceptance of the SIS18 it would be of great advantage to decrease the horizontal emittance by a so called emittance transfer to the vertical plane. In this contribution the present status of the emittance transfer experiment EMTEX at GSI will be reported. A short introduction about the theoretical background of the technique will be given, while the main part is dedicated to the practical solutions setting up a test beam line at GSI. Finally, the results of a first commissioning beam time will be presented. The scheduled beam time to apply the emittance transfer technique foreseen in spring 2014 had to be shifted to calendar week 26 in 2014, just after this conference as some components have not been delivered in time by the contractor. The results and comparison to the theoretical predictions you may find in later publications.

The harmonic magnetic field properties due to eddy currents have been studied with respect to the geometry of the vacuum beam chamber. We derived a generalized formula enabling the precise prediction of any field harmonics generated by eddy currents in beam tubes with different cross-sectional geometries. Applying our model to study the properties of field harmonics in beam tubes with linear dipole magnetic field ramping clearly proved that the circular cross section tube generates only a dipole field from eddy currents. The elliptic tube showed noticeable magnitudes of sextupole and dipole fields. We demonstrate theoretically that it is feasible to suppress the generation of the sextupole field component by appropriately varying the tube wall thickness as a function of angle around the tube circumference. This result indicates that it is possible to design an elliptical-shaped beam tube that generates a dipole field component with zero magnitude of sextupole. In a rectangular-shaped beam tube, one of the selected harmonic fields can be prevented if an appropriate wall thickness ratio between the horizontal and vertical tube walls is properly chosen. Our generalized formalism can be used for optimization of arbitrarily complex-shaped beam tubes, with respect to suppression of detrimental field harmonics.

To provide the primary proton beam for the FAIR antiproton research program, a 70 MeV, 70 mA linac is currently under design & construction at GSI. The nc machine comprises an ECR source, a 3 MeV RFQ, and a DTL based on CH-cavities. Up to 36 MeV pairs of rfcoupled cavities (CCH) are used. A prototype cavity has been built and is prepared for high power rf-testing. An overview of the status as well as on the perspectives of the project is given.

The CBM superconducting dipole magnet is a central part of the detector system. The target station and the Silicon Tracking System are placed in the magnet gap. The magnet has to provide the vertical magnetic field with a bending power of 1 Tm on the length 1m from the target. A perspective view of the magnet is shown in figure 1. The magnet gap has a height of 140 cm and a width of 250 cm in order to accommodate the STS with a polar angle acceptance of ± 25° and a horizontal acceptance of ± 30°. The magnet is of the H-type with a warm iron yoke/pole and cylindrical superconducting coils in two separate cryostats like the SAMURAI magnet at RIKEN [1, 2]. The potted coil has 1749 turns. The wire – similar to the CMS wire – has Nb-Ti filaments embedded in a copper matrix, and is soldered in a copper stabilizer with a total Cu/SC ratio of about 13 in the conductor. The operating current and the maximal magnetic field in the coils are 686 A and 3.25 T, respectively. The coil case made of stainless steel contains 20 liters of liquid helium for one coil. The vertical force in the coils is about 250 tons. The cold mass is suspended from the room temperature vacuum vessel by six suspension links. Six cylindrical support struts compensate the vertical forces.