Transcript Dr Markus Heiss

My CELLION time
The
single cell irradiation setup
at the
CENBG in Bordeaux
From July 2004 to July 2005 I worked in the frame of CELLION-project at the
"Centre d'Etudes Nucléaires de Bordeaux Gradignan" (CENBG) in Bordeaux.
Markus Heiss
Centre d'Etudes Nucléaires de Bordeaux Gradignan
Bordeaux, February 2006
The cell irradiation setup
Markus Heiss
Centre d'Etudes Nucléaires de Bordeaux Gradignan
Bordeaux, February 2006
Schematic of the irradiation setup
X-Y-stage
sample
10µm
diaphragm
ion beam
gas
detector
lightsource
light shutter
+HV
CCD
camera
objective
vacuum
window
Properties:
• working like an ionisation chamber =>
relyable detection
• scattering of the ions due to the gas
• scanning of the beam is not possible
Markus Heiss
Centre d'Etudes Nucléaires de Bordeaux Gradignan
Bordeaux, February 2006
The replacement of the detector
Electrons
Electrondetector
Ion
Vacuumwindow
Properties:
• detecting secondary electrons from the
vacuum window
• special coating of the window necessary
• beam can be scanned
Markus Heiss
Centre d'Etudes Nucléaires de Bordeaux Gradignan
Bordeaux, February 2006
Tests with the channeltron
accelerating
voltage
surface barrier
detector
channeltron
attracting
voltage
pulse height spectrum
ion beam
shielding
Si3N4-window
background spectrum
Markus Heiss
Centre d'Etudes Nucléaires de Bordeaux Gradignan
Bordeaux, February 2006
Accuracy tests
~10 min
Markus Heiss
Centre d'Etudes Nucléaires de Bordeaux Gradignan
Bordeaux, February 2006
shift [µm]
Thermal expansion
temperature [°C]
time [min]
time [min]
Markus Heiss
Centre d'Etudes Nucléaires de Bordeaux Gradignan
Bordeaux, February 2006