Folie 1

1
Task number SIS18- 4
Injection / extraction upgrade
Jürgen Florenkowski GSI, Darmstadt Agenda Annual
Report Meeting EU construction ( CNI )
contract "DIRAC-PHASE-1" for the FAIR
project September 26, 2006
2
Upgrade Motivation

• Extraction
• We have to analyse the extraction in booster
  mode. Further investigations has to find out,
  where is the limitation for the acceptance.
• The first assumption is that the dipole chamber
  in front of the extraction channel is the reason
  for the limitation.

3
Upgrade Motivation

• 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. The new one has a scraper to protect the
  anode made of 0.1mm wires.
• Beam diagnostic is necessary to minimize the
  losses while injection from transfer channel to
  SIS. This is not present yet.

4
Upgrade Motivation

• Inflector Magnet
• The acceptance limitation is given by the present
  inflector magnet in front of the injection
  septum. The present magnet is divided in 3 parts.
  A new development optimise the beam path to the
  limited space between transfer channel and SIS
  beam pipe.
• For the bake procedure we have to raise the coils
  from the beam pipe. Only then we are able to
  install the heating seal. After the bake
  procedure we have to reinstall the coils. The new
  inflector magnet has the heating seal build in.
  That minimize the time for service.

5
The heavy ion synchrotron SIS 18
Injection septum
SIS 18
Inflector magnet
Experiments
UNILAC
Extraction beam line
6
Main components of an e - septum
Deflection unit
Cathode
Anode
High voltage power supply
Vacuum chamber
7
Parameters of the e-septum
Comparison of existing and new e-septum
8
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

9
Septum design

• Design goals
• Adjustable anode and cathode
• 300 kV insulation
• Back able up to 300
• Beam diagnostic (profile monitor)
• Septum protection (scraper)

10
Cathode surface treatment

• Requirements
• 300C back able surface
• Field strength 100KV / cm
• Cooperation with Fraunhofer Institut
  Elektronenstrahl- und
• Plasmatechnik
• Plasma activated high rate deposition of
  Aluminumoxid
• GSI will ship a test cathode of high-grade steel
  and aluminum in October 2006
• After treatment GSI will test the maximum
  reachable field strength and heat the test
  cathode up to 300C

11
Option electron - beam treatment
In parallel we have the treatment procedure with
pulsed electron beams developed by the Institute
of High current electronics in Tomsk (RU)
Radiation facility
Stainless steel treatment
After
Before
12
Time schedule
13
Costs e - septum

• Construction costs GSI
• Preliminary investigations and project analyses
  110 h
• 3D construction 470 h
• Drawings 2D 100 h
• Summary 680 h
• Manufacturing costs GSI and other companies
• Material 42.600
• Assembly 261h / 60 15.660
• Unexpected or additional work 21.847
• Summary 80.107
• Cathode Treatment
• Fraunhofer Institut Elektronenstrahl- und
  Plasmatechnik 20.900
• Institute of high current electronics in Tomsk
  (RU) 200.000
• 300KV power supply
• Supplied by FUG and examined by GSI 160.000

14
Inflector Magnet

• Present Design

Inflector Magnet
Device to raise the Magnet
Connector side
e - septum
SIS beam pipe
Rack
15
New design

• Design goals
• Build in heating seal
• Optimized beam path

Magnet
Injection channel
Connector box
SIS beam pipe
16
Inflector Magnet

• To finish the project inflector magnet we have to
• Fix the design
• We have to examine the offers from outside firms.
  The dead line for the offers was 22.09.06.
• Check the personnel involvement
• Cost estimate
• Commissioning parts
• Assembling the magnet
• Testing
• Installation