P. Spiller, SIS18upgrade, Peter Spiller GSI, Darmstadt Kick off Meeting - EU Construction DIRAC Phase SIS18 upgrade
P. Spiller, SIS18upgrade, 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 2x x10 11 Repetition Rate 0.3 Hz1 Hz 2.7 – 4 Hz
P. Spiller, SIS18upgrade, 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
P. Spiller, SIS18upgrade, 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
P. Spiller, SIS18upgrade, 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
P. Spiller, SIS18upgrade, 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
P. Spiller, SIS18upgrade, Task 2: UHV system upgrade Goals: Generation of extremly low static pressures of p 0 < 5x mbar and increasement of average pumping speed by up to a factor of 100 Stabilization of dynamic pressure p(t) max < 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
P. Spiller, SIS18upgrade, 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 < 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
P. Spiller, SIS18upgrade, 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 ( 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
P. Spiller, SIS18upgrade, 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
P. Spiller, SIS18upgrade, 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: % Complete charge state separation for high intensities Lower transmission losses in TK and the SIS Improvement of beam brilliance: 30 %
P. Spiller, SIS18upgrade, Task Leader and Expected Budget Task #TitleTask LeaderTotal Budget 1Rf acceleration cavityP. Hülsmann UHV system upgradeH. Reich Collimator systemP. Spiller Injection/Extraction system U. Blell Beam profile monitorP. Forck Charge separatorW. Barth Total
P. Spiller, SIS18upgrade, Work Breakdown Structure