| McGill_Medical_Physics_Unit This page gives the basic information on the graduate programs in Medical Physics at McGill University in Montreal. |
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| Prof__Grazia_Gambarini Three dimensional dosimetry for radiotherapy, University of Milan (Italy). |
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Welcome 
30MeV -
Cyclotron (other View)
View of
the beam line going into the target vault
This first coil of the beam line is the steering x-y axis that will control the horizontal and
vertical adjustments. The weak magnetic field (180gauss) will bend the beam 20mm at 3000mm.
The tuning power supply is controlled by a programmable logic controller (PLC) and all parameters may be stored.
Top view
of the beam line from the cyclotron vault .
The first block after the steering magnet is the collimator entrance. This will trace and measure the beam profile
for right and left tuning . The collimator is cooled by water and will have a maximum rated current of
approximately 250uA on each side. If the beam is more than 250uA the PLC will decrease the ion source of
the cyclotron to a lower current mode to avoid a catastrophe!
Below the collimator (see picture above) is a diffusion pump and a mechanical pump
which produces a beam line vacuum of 1.0 10-6 mbar.
An identical pump assembly is also located at the end of the beam line.
Next to the collimator is the quadrupole magnet. This device focuses the beam into a very dense beam spot
of approximately 3mm in diameter. The center of the quad produces a magnetic field of 3500 gauss.
The current and voltage in the coil (water cooled) will be 90A and 20vdc which is also regulated by the PLC.
When the stream of negative ions exit the magnetic field of the cyclotron, it has the tendency to divert in
the horizontal plane because of the strong magnetic field of the switching magnet.
The first quadrupole will correct this "offset" divergence in the horizontal axis. =>H<=
The second quadrupole will converge the beam in the vertical axis offset created from the first quad.
The third quadrupole performs horizontal focusing .
View of the beam line from the target vault.
After the quadrupole magnet is the neutron shutter (the square box). This device will close the opening line
when the cyclotron is running.
The neutron shutter is able to rotate in it`s chamber, thus obstructing
the path of neutrons coming from the cyclotron vault.
Therefore one has the ability to work in the solid target room while the cyclotron is running in the main vault.
View of
faraday - viewer station from the target vault
This station provide you a pre-tune view of the beam.
The viewer is tilted at 45 degrees and is made of a tantalum foil (0.1mm thick, coated with a thin layer of alumina).
A camera is placed on the Pyrex window. This gives you a dynamic view of the protons and
allows one to optimally shape the beam.
Due to poor thermal conductivity of the alumina, the viewer is water cooled.
Additionally when a proton strikes the alumina it emits a photon.
Next to the viewer is the faraday, a useful device for maximizing the beam before bombardment.
The faraday and the viewer are the same design but are tilted slightly differently.
The faraday is a water cooled tantalum foil, 0.1mm thick, tilted at 90 degrees, and
can handle more than 500uA at 32Mev.
Optical
viewer from the target station.
This station will be placed at the end of the beam line. The viewer has
collimator fingers for x and y axis tuning and a beam dump on the extreme end.
The target will be placed at 7 degrees. This will provide greater surface area for the irradiation while reducing any "hot" spots due to the high current beam.
After the irradiation (length of irradiation will depend on the desired isotope)
the radioactive target will be remotely removed and placed into a shuttle system.
This PLC controlled device will transport the material into the radiochemistry lab for final processing.
"Cold" simulated target - laser beam showing the beam profile.
3 D View Of 7 deg target assembly with Foil
isolation chamber Opened.
This is mainly used for In-111 - Cu62 - Co57
The target assembly require no tool for assembly and separation!.
3 D View Of 37 deg target assembly with Foil
isolation chamber Close For Pressure vessel.
This is mainly used for I-124
Device for Preparation of the solid Target during Plating .
Thick
heavy material is very difficult to achieve without avoiding precipitate plating thus a
furbishing system was developed.
as well as brushing during plating also improved the surface and addison quality.
I micro CPU controls the Number of pass, pre-set.
Close up surface of plating Cd112 .
(Colored picture by computer
redering.)
Picture on the left shows result after a furbishing.
View Beam Profile at 25uA under Vacuum
(AVI file).
View Beam Profile at 2.5uA
through Havar foil and Helium Chamber (AVI)
Beam Profile at Cu Trg Extreme End
Beam Line
Beam Centering X-Y Steering
Magnet
Quad-C tuning influence on
beam profile
Quad-B influence on beam Profile
Main Coil influence on beam profile
E-mail me!
Since Projects 11/2/1998
Last time Edited 09/12/2008
