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