1. P. Spiller, SIS18upgrade, 1.12.05 Peter Spiller GSI, Darmstadt Kick off Meeting - EU Construction DIRAC Phase 1 1.12.2005 SIS18 upgrade

2. P. Spiller, SIS18upgrade, 1.12.05 Stages of SIS18 Operation Modes Fair Stagetoday0 (Existing Facility) 1 (Super FRS, CR, NESR) 2,3 (SIS100 Booster) Ion SpeciesU 73+ U 28+ Maximum Energy 1 GeV/u 0.2 MeV/u Maximum Intensity 3x10 9 2x10 10 2.3x10 11 Repetition Rate 0.3 Hz1 Hz 2.7 – 4 Hz

3. P. Spiller, SIS18upgrade, 1.12.05 The SIS18 upgrade program Supported by EU Construction Proposal:  Task 1: RF System New h=2 acceleration cavity and bunch compresion system for FAIR stage 0, 1  Task 2: UHV System New, NEG coated dipol- and quadrupole chambers  Task 3: Insertions Set-up of a „desorption“ collimation system  Task 4: Injection / Extraction Systems New injection septum, HV power supply and large acceptance extraction channel  Task 5: Beam Diagnostics Systems Fast residual gas profile monitor and high current transformer  Task 6: Injector Set-up of a charge separator

4. P. Spiller, SIS18upgrade, 1.12.05 Not supported by EU Construction Proposal:  Pulse Power Connection Dedicated 110 kV power connection and transformer for fast ramping  Replacement of Main Dipole Power Supplies Operation with 10 T/s up to 18 Tm  Longitudinal and Transverse Feed Back Systems Damping of coherent oscillations, coupled bunch modes and phase stabilization  Beam Diagnostics upgrade New digital front end electronics for BPMs New high current transformer  Machine Protection and Interlock Systems Halo collimators, local shielding, transmission interlock etc.  Development of High Current Operation Compensation of resonances, impedance issues etc. The SIS18 upgrade program

5. P. Spiller, SIS18upgrade, 1.12.05 Goals:  Generation of sufficient rf voltage for fast ramped operation U 73+ acceleration with 4 T/s U 28+ acceleration with 10 T/s  Sufficient bucket acceptance (no rf capture losses, no losses during acceleration)  Flat bunches for reduced space charge effects during high intensity operation Task 1: New Acceleration Cavity  Upgrade of the rf system by a new MA loaded acceleration cavity  Two harmonic operation (h=2,4) together with one of the existing Rf cavities

6. P. Spiller, SIS18upgrade, 1.12.05 Beam Loss and Dynamic Vacuum  Beam loss induced desorption degenerates the residual gas pressure and composition  Degenerated residual gas pressure reduces the beam life time > Instable during high intensity operation, heavy ion operation Dynamic PressureBeam Loss

7. P. Spiller, SIS18upgrade, 1.12.05 Task 2: UHV system upgrade Goals:  Generation of extremly low static pressures of p 0 < 5x10 -12 mbar and increasement of average pumping speed by up to a factor of 100  Stabilization of dynamic pressure p(t) max < 10 -9 mbar  Removement of contaminations by heavy residual gas components  Replacement of all dipole- and quadrupole chambers by new, NEG coated chambers  Improved bake-out system for operation up to 300K

8. P. Spiller, SIS18upgrade, 1.12.05 Task 3: Collimation System Goals:  Minimization of desorption gas production  Capture and removal of desorbed gas  Stabilization of the dynamic pressure to p(t)max < 10 -9 mbar  Installation of dedicated "desorption" collimators in each superperiod  Combination of low desorption rate materials, optimum geometrical configuration and powerful pumping Ionized particles hitting the collimator

9. P. Spiller, SIS18upgrade, 1.12.05 Task 4: Injection and Extraction System Goals:  Injection of U 28+ -ion beams at the standard injection energy of 11.4 MeV/u  Minimum beam losses during multi-turn injection  Minimum beam losses during medium energy extraction (100-200 MeV/u)  Installation of a new injection septum for the generation of very high field strengths  Enlargement of the acceptance of the injection channel (revision of inflector magnet)  Installation of a septum protection- and beam monitoring system  Increase of acceptance of the extraction channel

10. P. Spiller, SIS18upgrade, 1.12.05 Task 5: Fast Residual Gas Profile Monitor Goal:  Non-destructive turn by turn measurement of beam size and beam emittance  Observation of injection mismatch, linear coupling phenomena and resonance effects Development and installation of a fast, and highly resolving residual gas profile monitor Profile measurements used for optimization of beam injection

11. P. Spiller, SIS18upgrade, 1.12.05 Task 6: Charge Separator ΔΦ o = 39 o ΔΦ o = 51 o New power supplies  higher focusing strength (phase advance) of Alvarez-Quadrupoles TK charge state separator Beam line separation Consequences: Improvement of beam brilliance: 40-50 % Complete charge state separation for high intensities Lower transmission losses in TK and the SIS Improvement of beam brilliance: 30 %

12. P. Spiller, SIS18upgrade, 1.12.05 Task Leader and Expected Budget Task #TitleTask LeaderTotal Budget 1Rf acceleration cavityP. Hülsmann1 870 000 2UHV system upgradeH. Reich1 365 000 3Collimator systemP. Spiller1 100 000 4Injection/Extraction system U. Blell765 000 5Beam profile monitorP. Forck836 000 6Charge separatorW. Barth717 000 Total6 653 000

13. P. Spiller, SIS18upgrade, 1.12.05 Work Breakdown Structure