Presentation on theme: "FAIR Synchrotrons SIS100/300"— Presentation transcript:
1 FAIR Synchrotrons SIS100/300 Peter SpillerFAIR monthlyMay 18, 2007
2 Beam Parameters Bottleneck is SIS18 ! Heavy Ion OperationU28+ :Fast Extract.: 5x1011 pppSlow Extract. PossibleProton Operationp:Fast Extract.: 2.5 – 5x1013 pppSIS300Heavy IonStretcher ModeSlow Extract.: 3x1011 pps (d.c.)High Energy ModeU92+ :Slow Extract.: 1x1010 ppsBottleneck is SIS18 !Challenging and unique operation at the limit to vacuum instability defines the number of particles in SIS100
3 Technical Subsystems S3 S2 S4 S1 S5 S6 Sixfold Symmetry Sufficiently long and number of straight sectionsReasonable line density in resonance diagramGood geometrical matching to the overall topologyS1: Transfer to SIS300S2: Rf Compression(MA loaded)S3: Rf Acceleration(Ferrite loaded)S4: Rf AccelerationS5: Extraction Systems(slow and fast)S6: Injection System plus RF Acceleration and Barrier BucketThe SIS100 technical subsystemsdefine the length of the straightsections of both synchrotronsS3S2S4S1S5S6
4 SIS100/300 SectionsS1S4S2S5S3S6SIS100: Distribution of all devices completedSIS300: Distribution of devices ongoing
5 Two Stage Synchrotron SIS100/300 1. High Intensity- and Compressor Stage SIS100 with fast-ramped superconducting magnets and a strong bunch compression system.Intermediate charge state ions e.g. U28+-ions up to 2.7 GeV/uProtons up to 30 GeVFBTR: Bρ= 100 Tm - Bmax = 2 T - dB/dt = 4 T/s (straight dipoles)Bρ= 100 Tm - Bmax = 1.9 T - dB/dt = 3.8 T/s (curved dipoles2. High Energy- and Stretcher Stage SIS300 with superconducting high-field magnets and stretcher function.Highly charges ions e.g. U92+-ions up to 34 GeV/uIntermediate charge state ions U28+- ions at 1.5 to 2.7 GeV/u with 100% duty cycleFBTR: Bρ= 300 Tm - Bmax = 6 T - dB/dt = 1 T/s (short, straight dipoles)Bρ= 300 Tm - Bmax = 4.5 T - dB/dt = 1 T/s (long curved dipole)
6 Magnets: SIS100 Magnet Redefinition Sagitta of straight dipoles has defined the acceptanceBeam displacement in the fringe field and middle of the straight magnets enhance errorsMaximum required dipole and quadrupole field too highField properties questionableIncreased apertures compared to the original Nuclotron magnets:a) Higher current requirementsb) Enhanced AC loss and reduced quench stabilityc) Higher stored energy > Quench protection scheme difficult and requirescable modification (number of strands)Curved SIS100 Dipole Magnet Prolongated SIS100 Quadrupole Magnet
7 Magnets: SIS300 Magnet Redefinition The cos magnets (SIS300) consume more spacethan superferric magnets (SIS100) and are justsuitable for the small circumference.a) Not sufficient space in the arcsfor the FBTR doublet lattice cell> FODO latticeb) Dipole sagitta limits the acceptance(acceptable in strong focusing lattices)Reason: The effective field length in irondominated magnets is longer than the yoke. Theeffective field length in co magnets is muchShorter than the cold mass. SIS100 defines theratio between the straight section and arc length.
8 Magnets: Magnet Development Several model magnets for R&D on AC loss, field quality andmechanical aspects (JINR)Three prototype dipole magnets for SIS100 are in production(two straight (BNG, JINR) and one bent (BINP)Design review approval – Delivery in 2008Bent SIS300 prototype dipole magnet is in preparation (INFN)String test required ( ) approval for cryomagnetic integration ofall components
9 Structure: SIS100 Focusing Modules SIS100 missing dipole, doublet structure has kept unchanged.Two standard quadrupole units, but many exceptions !Big engineering effort for preplanning of cryomagnetic modules.Quadrupol unit of the arcincludes sextupole, BPM andcollimator (used also for pumping)Quadrupole unit of the straightsincludes BPM, sextupole andpumping chamberDipole Moduls
10 Structure: SIS300 Structure Redefinition FBTR SIS 300 LatticeDoublet Lattice base on short straight dipolesNew SIS 300 LatticeFODO Lattice based on long (and short) curved dipolesSmall ring circumference and matching to SIS100 geometry requires FODO lattice in SIS300 andcurved dipole magnets. Advantages a) chromaticity correction without significant DA reductionb) slow extraction with reasonable s.c. septum strength
11 ExtractionThe new missing dipole arc of SIS300 avoids lateral displacement between SIS100 and SIS300 and enables the bypassing of the SIS100 extraction line and thereby vertical extraction of both synchrotrons.
12 Extraction: SIS100 Extraction Section 3D conceptual design study for the SIS300, 3.5 T s.c. extraction septum Start prototyping in 2007.Prototype ramped, bipolar kicker in preparation.Halo ScraperElectrostatic SeptaBipolar Kicker SystemMagnetic Septa andEmergency DumpLambertson Septum
13 Transfersystem SIS100 – SIS300 Tight geometrical and matching constaints.Revision required because of new SIS300 FODO lattice.Design study collaboration FSY and ACCEL.Optical and technically feasible solution found.
14 Rf: Overview FBTR Technical Concept Acceleration System h=10 400 kV Ferrit ring core, "narrow" band cavitiesCompressionSystemh=2600 kVMagnetic alloy ring core, broad band (low duty cycle) cavitiesBarrier Bucket2x15kVFerrit loaded accel. cavity MA test cores at GSI SIS18 bunch compressor
15 Rf: SIS100 Acceleration Sections Acceleration Cavity:Design study completed (BINP)Engineering study completedStart prototype manufacturingexpected for 200716 ferrite cavities for acceleration in section S3 and S4
16 Rf: SIS100 Compression Section Compression Cavities:SIS18 compression system with very similar techn. parameters completed16 MA compression cavities in section S2
17 Synchrotron Main Supply Buildings Document „Specifications for Synchrotron Buildings“ includes main accelerator aspectsTable of floor space requirementsTables for cranes and double floorDistribution of supply units for allbuildings and floorsCable planning startedGeneral specificationsplus Load List
18 SIS100/300 Labyrinth and Supply Tunnel Building optimization for cryogenic and media supply required
19 HEBT: Revised FBTR Topology Matched to changes in CR, RESR,HESR and Super-FRS layoutHESR extension consideredN.c. beam line to pbar Target, PP, APGaps closed to extraction from SIS18and SIS100/300Matched to zero displacementbetween SIS100 and SIS300Adapted to changed SIS100/300magnet designSecond beam line for PP and PPperpendicularp beam line from SIS18 to HESR
20 Status of Optical Design and Next Steps Present statusLinear layout with chromatic- and space chargeeffects main for beam transport systemscompleted and approved (beside a few linesaround the storage rings)Higher order layout for Super-FRSHigher order layout with chromatic effects andtracking studies for pbar-separatorNext or ongoing design stepsProve of technical feasibility (e.g. collisions)Integration of beam diagnostics and correctors (presently proceeding)Technical pre-design (e.g. cryogenic system and supply, warm magnet design)Coordination with civil construction (e.g. alignment, building floor, infrastructure)Modification and optimization of supply buildings (presently proceeding)Building 4 and 4a
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