Plasmaphysik aus Beschleunigerperspektive

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SIS100
Peter Spiller Design Study Group DIRAC kick-off
meeting 13.4.2005
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SIS100 in FAIR
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SIS 100 Project Overview
RD phase Construction
phase
Importance of the year 2008 ! Demonstration of
the U28 operation in SIS18 bevor series
production of SIS100
Device TRs
Accel. TDR (all device developments finished)
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TR Estimates - RD Phase SIS100
Total Investments M Est. Personnel Involvement FTE Est. Personnel Involvement M Investment /Personnel M/FTE Investment Personnel M EU Total expected M EU Requested Budget M
System Planning 0.682 0.252
Magnets 3.405 - - 3.405 x 1.7 0.733
Power Supplies 0.04 5.8 0.487 0.007 0.527
RF Systems 4.488 44.7 3.755 0.1 8.243 1.26 0.63
Injection/Extraction 0.37 3.5 0.294 0.1 0.664
Beam Diagnostics 3.26 42.7 3.586 0.076 6.846 1.141 0.272
Vacuum System 3.05 50.8 4.267 0.06 7.317 0.697 0.191
Insertions 0.05 10.2 0.857 0.005 0.907
Cryogenics 0.595 32 2.688 0.018 3.283
Safety and Machine Protection 0.075 4.5 0.378 0.017 0.453
Total 15.333 194 16.3 0.048 31.3 5.48 2.078
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SIS100 Subtasks and Participants
UHV ERDA Measurements GSI, TU Darmstadt, LMU
Rf1 Longitudinal feed back system GSI, CERN
Rf2 Fast high power switches for rf gaps GSI, CERN
System Design High current beam dynamics studies GSI, TU Darmstadt, LBNL, BNL, Uni Bologna
Beam Diagnostics Digital signal analysis electronics for BPMs GSI, CERN, TU Darnstadt, Company Itech, FZJ
Magnets Fast ramped super conducting magnets GSI, Company BNN, JINR, Company ACCEL
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ERDA - Advanced Materials and Coatings
Dipole magnet
?loss 104-105 !!!
beam loss induced desorption yield
capture losses (dominate in SIS18/LEAR)
?lt1o
Pb53
capture
pressure bumps
X
Pb54
Pb54
stripping
?loss
109 Pb54 (4.2 MeV/u)
Pb55
stripping losses (U28 SIS100)
RD goal Materials for Accelerator Components
and Structures e.g. Collimators, with Low
Desorption Coefficient
Beam Losses caused by vacuum instability
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Rf Gap Switch Minimization of Cavity Impedances
SIS100 Rf Systems Number of Acceleration
Cavities 30 15 Number of
Bunch Compression Cavities 25
Only the Rf system required is visible for the
beam Options MOSFET, IGBT, High Tc
Superconducter
Preliminary parameters of a semi-conductor rf gap switch Preliminary parameters of a semi-conductor rf gap switch
switching time ? 1 ?s
max applied voltage 20 kV
max current 50 A
impedance ? 5 W
RD goal Development of a high power Rf gap
switch for inductivily loaded cavities with a low
impedance, for high image currents
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Longitudinal Feed Back System
Damping of coupled bunch oscillations induced by
unwanted higher order modes. Longitudinal
feedback system consists of a dedicated RF
kicker, which applies an energy correction, an
electromagnetic kick, to a passing bunch.
Damping of longitudinal oscillations around the
synchrotron phase. To damp all the dipole mode
oscillations, the kick force must change its
phase from a passing bunch to the next bunch.
Thus half the bunch frequency is nessesary for
the bandwidth of a longitudinal feedback kicker.
Complex interaction during high current operation
with broad band MA loaded cavity impedance
RD Goal Prototype longitudinal feedback
system for damping of higher order mode bunch
oscillations

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High Current Beam Dynamics

• Transverse Beam Dynamics Nonlinear Lattice
  Properties
• 
  under Space Charge Influence
• Collective Instabilities and Impedances
  Definition of Impedance Budget
  
• 
  (Impedance Acceptance)
• 
  Analysis and Optimization of
  Device Impedances
• Longitudinal Beam Dynamics Simulation of high
  intensity beams including interaction
• 
  with realistic properties (e.g. impedance) of
  Rf systems
• 
  Definition of optimized Rf manipulations for
  single bunch
• 
  generation and compression

Franchetti et.al
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Digital Signal Analysis Electronics for BPMs
Transition from analoge (different dedicated
systems) to a digital (single), fully
programmable BPM electronics for e.g. a) high
resolution beam position measurement (large beam
fill factor) on the ms scale and b) broad-band,
turn-by-turn position measurement Tests of the
new electronics hardware in CERN PS
RD goal 4-channel 250 MS/s 12Bit analogue
board with sufficient memory and a set of high
performance algorithms implemented on the digital
board
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Fast Ramped Superconducting Magnets
Window frame magnet with superconducting coil
Nuclotron Cable
Nuclotron Dipole in Cryostat
Reduction of AC losses during ramping by
improved iron yoke design 40 W/m gt 13
W/m Bmax 2 T,
dB/dt 4T/s, f 1 Hz
RD goal Mechanical and Structural RD New
Coil Layout Prototypes for Dipoles and
Quadrupoles