BEAM PROFILE MONITORS1
Secondary Emission Monitor (SEM) for multi-plane ion beam profile measurement
When particles of an ion beam hit a
wire of the grid, secondary electrons are
emitted resulting in an electrical current.
Originally designed by the CEA/CNRS at
GANIL (Grand Accélerateur National
d'Ions Lourds), grids of W/Au wires are
arranged together across the transversal
plane of the beam propagation. Each wire
collects a small part of the beam resulting in
a signal which is proportional to each
beamlet intensity. All the signals are
multiplexed with a dedicated high
performance data acquisition electronic
system. The software displays a dynamic
histogram of both planes with high
precision both in intensity and position.
Beam energy: from few keV/A to 100MeV/A
Beam intensity: 1 nA to 100µA continuous
beam mode or higher intensities when pulsed2.
47 wire per grid for different beam size:
• 23 or 47mm at 0,5 to 1 mm steps
• 70 or 87mm at 3, 2, 1mm variable steps
Wire diam.: 70 to 150µm
Flanges: 160 (CF/ISOF/KF) or 200 (CF)
Actuator stroke: 120 or 210 mm
Leak rate <10-8 mbar.l.s-1
Profiler and actuator
Fixed step grid
Variable step grid
Electronic Rack 3U - 84F
Software visualisation
1 The SEM profilers are provided under a CEA/CNRS licence.
2 The temperature of a single wire is to be kept below 1200°C. Its diameter is customized to your application.
WWW.PANTECHNIK.COM
ELECTRONIC PRINCIPLE
The electronic rack features two separated functions:
• the data acquisition• the automatic function of HV biasing and actuation
The analogical signals coming from each wire are acquired by integration and digitized by the
front-end cards. They are treated by the FPGA on the mother board and then displayed on the
dynamic X and Y histogram graphs of the software.
Depending of the beam intensity, front-end card may use active or passive components
resulting in an integration time of 200µs to 10s.
Data acquisition and treatment Multi-acquisition racks cabinet
The power supply of the electronic rack is 24V. A 5 outputs 220V AC power supply is
optionally provided.
March 2018
PANTECHNIK
13 rue de la Résistance 14400, Bayeux France T: +33 231 51 27 60 F: +33 231 21 96 33
[email protected] www.pantechnik.com