1. Peter Spiller, CBM collaboration meeting GSI-Darmstadt 11. February 2004 Status of the future accelerator project

2. Injector (UNILAC) Status Significant progress with UNILAC and source development Status of uranium currents in TK9 (SIS Injection) (machine experiments) : U 73+ 1 mA U 28+ 2.7 mA Expected number of particles in SIS : U 73+ 6 x 10 9 (MIT x15) U 28+ 4 x 10 10 (MIT x15) Highest Beam Intensity achieved in SIS18 for U 73+ : 4.5 x 10 9 (Dec. 2003 MEVVA ion source and MTI) Goal of the CBM injector chain (parameter list) : 4 x 10 10

3. Dynamic Vacuum and Beam Life Time Measured (Dec. 2003) : 29 % losses at 6.5 x 10 9 ions Calculated : 40 % losses at 1x10 10 Ions Beam-wall interaction creates desorption gases which increase the residual gas pressure  Reduced beam life time  Intensity limitation  Enhanced losses SIS18 acceleration Dec. 2003

4. Short cycle time and short sequences (new network connection in preparation) Enhanced pumping power (UHV upgrade) (Cryo pumps/panels, NEG coating/stripes) (negotiations and plannings) Localization of losses and controle of desorption gases Installation of twelve desorption collimators (prototype installed in SIS18) Low-desorption rate materials ( Desorption rate test stand in operation ERDA measurements in preparation) Measures for High Intensity Operation wedge collimator increased pressure ion beam cryo pump

5. Pulse Power Requirements SIS18 : 30 MW (10 T/s – I max = 2.3 kA) SIS100 : 18 MW (4 T/s – I max = 6 kA) SIS300 : 24 MW (1 T/s – I max = 6 kA) (SIS200 : 7 MW) Pulse Power Connection Goal : Direct and exclusive connection via a 110 kV power line to a 220 kV transformer in the main power station in Urberach Modifications in Leonhardstanne (local GSI power station) in two stages Stage 1. : SIS18 with 4 T/s or SIS12 with 10 T/s Stage 2. : SIS12 + SIS100 + SIS300 Power grid simulations finished Negotiations with network operating companies finished Contract in preparation. Time for provision 1.5 years.

6. SIS18 upgrade Program Resonance Correction Correction coils installed for operation at the new high current working point Beam Loss Controle Beam loss monitor system installed along the full circumference Septum Protection Collimators for septum protection installed Loss catcher Prototype desorption collimator installed

7. Two Stage Synchrotron Concept  High Intensity- and Compressor Stage SIS100 with fast-ramped superconducting magnets and a strong bunch compression system. BR = 100 Tm - B max = 2 T - dB/dt = 4 T/s Intermediate charge state ions e.g. U 28+ -ions up to 2715 MeV/u Highly charged ions U 73+ for the high energy operation of SIS300. Protons up to 30 GeV  High Energy- and Stretcher Stage SIS300 with superconducting high-field magnets and stretcher function. BR = 300 Tm - B max = 6 T - dB/dt = 1 T/s Highly charges ions e.g. U 92+ -ions up to 34 GeV/u Intermediate charge state ions U 28+ - ions at 400 to 2715 MeV/u with 100% duty cycle

8. SIS100 Magnet R&D Nuclotron Cable Nuclotron Dipole Significant R&D progress achieved on dynamic losses and field quality  B max = 2 T – B’ = 4T/s  Window frame magnet with s.c. coil  Main task : Reduction of AC losses during ramping by improved iron yoke design (40 W/m > 13 W/m)

9. SIS 100 Magnet R&D (GSI/JINR) R&D goal: AC loss reduction to 13 W/m @ 2T, 4 T/s, 1 Hz New endblock design Top view Front view

10. Rutherford cable RHIC dipole (4T) UNK dipole (6T) SIS300 Magnet R&D (GSI/BNL – GSI/IHEP)  B max = 6 T – B’ = 1 T/s  Cos  magnet with a two layer coil  Main task : Reduction of AC losses during ramping by improved cable and coil design Significant R&D progress achieved on dynamic losses of a (4T) model coil

11. SIS 300 Magnet R&D AC-Losses @ 4T, 1T/s, 0.125Hz : 9 Watt/m Ramp Rate [T/s] AC losses/cycle [J] Results of the model magnet : 4.38 T @ 2 T/s Cored rutherford cable Laser cutted cooling slots

12. 6 T Magnet R&D (GSI/IHEP) Cross section of the UNK dipole (4.5 K) with two layer coil Operation parameters : 5.11 T at 0.11 T/s Conceptual Design Study for a model dipole based on the UNK magnet design Options for Reduction of AC losses (Factor  100):  Filament diameter  Wire twist pitch  Wire coating  Cable (interstrand) losses Three preliminary design versions for different operation temperatures by the end of febr04.

13. Participating Companies and Institutions Collaborators for SIS100 magnet R&D : JINR, Dubna, Russia BINP, Novosibirsk, Russia Kurchatov Institute, Moscow, Russia Babcock Noell, Wuerzburg, Germany University of Twente, Twente, Netherlands St. Petersburg State Technical University PSI, Villigen, Switzerland VNIIKP, Moscow, Russia Dynex, Lincoln, Great Britain EUPEC, Warstein, Germany Collaborators for SIS300 magnet R&D : BNL, Upton, USA IHEP, Protvino, Russia Kurchatov Institute, Moscow, Russia ACCEL, Bergisch-Gladbach, Germany Babcock Noell, Würzburg, Germany CEA, Saclay, France LBNL, Berkeley, USA University of Jena,Jena, Germany University of Twente, Twente, Netherlands Vacuumschmelze, Hanau, Germany VNIIKP, Moscow, Russia Dynex, Lincoln, Great Britain EUPEC, Warstein, Germany Strong International Development Structure Established by the GSI magnet group