Transcript Folie 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
Jürgen Florenkowski
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.
Jürgen Florenkowski
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.
Jürgen Florenkowski
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.
Jürgen Florenkowski
The heavy ion synchrotron SIS 18
Injection septum
SIS 18
Inflector magnet
UNILAC
Experiments
Extraction beam line
Jürgen Florenkowski
Main components of an e - septum
Deflection unit
Anode
Cathode
High voltage
power supply
Vacuum
chamber
Jürgen Florenkowski
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
Back able
Up-to 150 degree
Up-to 300 degree
Gap width max.
3 cm
3 cm
Diagnostics
None
Beam profile monitor
Protection
None
Scraper
Jürgen Florenkowski
Electrostatic field calculations
SIS 18
UNILAC
Design values:
Anode
• Voltage:
300 kV
• Gap width:
3 cm
• Field strength max.:
100 kV / cm
• Deflection angle:
2.5 °
Jürgen Florenkowski
Cathode
Septum design
Design goals:
• Adjustable anode and cathode
• 300 kV insulation
• Back able up to 300 °
• Beam diagnostic (profile monitor)
• Septum protection (scraper)
Jürgen Florenkowski
Cathode surface treatment
Requirements :
• 300°C 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 300°C
Jürgen Florenkowski
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
1 mm
1 mm
After
Before
Jürgen Florenkowski
Time schedule
Jürgen Florenkowski
Costs e - septum
Construction costs GSI
• Preliminary investigations and project analyses
• 3D – construction
• Drawings 2D
Summary
110 h
470 h
100 h
680 h
Manufacturing costs GSI and other companies
• Material
• Assembly
• Unexpected or additional work
261h / 60€
Summary
42.600€
15.660€
21.847€
80.107€
Cathode Treatment
• Fraunhofer Institut Elektronenstrahl- und Plasmatechnik
• Institute of high current electronics in Tomsk (RU)
20.900€
200.000€
300KV power supply
• Supplied by FUG and examined by GSI
Jürgen Florenkowski
160.000€
Inflector Magnet
Present Design
Inflector Magnet
Device to raise the Magnet
e - septum
SIS beam pipe
Jürgen Florenkowski
Connector side
Rack
New design
Design goals
• Build in heating seal
• Optimized beam path
Magnet
Injection channel
SIS beam pipe
Jürgen Florenkowski
Connector box
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
Jürgen Florenkowski