Folie 1

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Task number SIS18- 4 injection / extraction
upgrade
Udo Blell GSI, Darmstadt Kick - Off Meeting 2.
December 2005
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Upgrade background

• Injection (e septum)
• The maximum field strength of the electrostatic
  septum is not sufficient for injection of U28 -
  beams at the standard energy of 11.4 MeV/u
• (at present 7.1 MeV/u).
• Currently the electrostatic septum is not
  protected against beam losses in the injection
  channel.
• Extraction (dipole magnet chamber)
• SIS12/18 is being operated as a booster for
  SIS100, the extraction energy is rather low.
  Acceptance limitation is given by the last dipole
  magnet chamber in front of the extraction
  channel.

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The heavy ion synchrotron SIS 18
SIS 18
E - injection septum
UNILAC
Experiments
Extraction beamline
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Main components of an e - septum
Deflection unit
Anode
Cathode
High voltage power supply
Vacuum chamber
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Parameters of the e-septum
Comparison of existing and new e-septum
Existing New
Max. Voltage 160 kV 300 kV
Field strength 50 kV / cm 80 kV / cm
Backable Up-to 150 degree Up-to 300 degree
Gap width max. 3 cm 3 cm
Diagnostics None Beam profile monitor
Protection None Scraper
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Electrostatic field calculations
SIS 18
UNILAC
Anode
Cathode

• Design values
• Voltage 300 kV
• Gap width 3 cm
• Field strength max. 100 kV / cm
• Deflection angle 2.5

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E septum design

• Design goals
• 300 kV insulation
• Backable up-to 300
• Beam diagnostic (profile monitor)
• Septum protection (scraper)

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Option electron - beam treatment
Institute of high current electronics TOMSK (RU)
Radiation facility
Stainless steel treatment
Before
After
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Time schedule
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Investment and personal costs
Personnel Involvements
2005 2005 2005 2006 2006 2006 2007 2007 2007 2008 2008 2008 Total Total Total
S E T S E T S E T S E T S E T
Injection / Extraction 2 1.5 0.5 0.5 3.5 1
Investments
Investments in M 2005 2006 2007 2008 Total
Injection / Extraction 0.06 0.1 0.5 0.1 0.76