P. Spiller, SIS18upgrade, 1.12.05
Peter Spiller
GSI, Darmstadt
Kick off Meeting - EU Construction DIRAC Phase 1
1.12.2005
SIS18 upgrade
P. Spiller, SIS18upgrade, 1.12.05
Stages of SIS18 Operation Modes
Fair Stage today 0(Existing Facility)
1(Super FRS, CR, NESR)
2,3(SIS100 Booster)
Ion Species U73+ U73+ U73+ U28+
Maximum Energy
1 GeV/u 1 GeV/u 1 GeV/u 0.2 MeV/u
Maximum Intensity
3x109 2x1010 2x1010 2.3x1011
Repetition Rate
0.3 Hz 1 Hz 1 Hz 2.7 – 4 Hz
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
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
P. Spiller, SIS18upgrade, 1.12.05
Goals: Generation of sufficient rf voltage for fast ramped operation
U73+ acceleration with 4 T/s
U28+ 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, 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
P. Spiller, SIS18upgrade, 1.12.05
Task 2: UHV system upgrade
Goals: Generation of extremly low static pressures of p0 < 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
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
P. Spiller, SIS18upgrade, 1.12.05
Task 4: Injection and Extraction System
Goals:
Injection of U28+ -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
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
P. Spiller, SIS18upgrade, 1.12.05
Task 6: Charge Separator
ΔΦo = 39o
ΔΦo = 51o
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 %
P. Spiller, SIS18upgrade, 1.12.05
Task Leader and Expected Budget
Task # Title Task Leader Total Budget
1 Rf acceleration cavity P. Hülsmann 1 870 000
2 UHV system upgrade H. Reich 1 365 000
3 Collimator system P. Spiller 1 100 000
4 Injection/Extraction system
U. Blell 765 000
5 Beam profile monitor P. Forck 836 000
6 Charge separator W. Barth 717 000
Total 6 653 000
P. Spiller, SIS18upgrade, 1.12.05
Work Breakdown Structure
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