1. Lebanese Teacher Programme 18/04/2017
Georges @
CERN!
Georges TRAD
Lebanese Teacher Programme 18/04/2017

2. “…
Lebanese person at CERN would talk about himself, present his work, his carrier, etc., for a short time (5-10 minutes).
In this way, they get to know what Lebanese people are doing at CERN, how did they manage to get there and what their future plans. …”
WHO?
HOW?
WHAT?
NEXT?

3. I came to CERN at the age of 21
This is my 8th year at CERN

4. Joint Universities Accelerator School (JUAS)
Feb 2010
JUAS Mission Statement
• The mission of the Joint Universities Accelerator School (JUAS) is primarily to train graduate students from the Partner Universities in the science, technology and applications of particle accelerators
• For this purpose, JUAS holds two five-week courses yearly at the European Scientific Institute (ESI) in Archamps, taught by renowned experts from universities and laboratories and accredited by the Partner Universities:
–A course on the Science of Particle Accelerators
–A course on the Technology and Applications of Particle Accelerators
• Depending on the availability of places, JUAS also welcomes graduate students from other universities as well as professionals

5. Beam Instrumentation Group (BI)
Operations Group (OP)
Beam Instrumentation Group (BI)
Building and maintaining the instruments that allow observation of the particle beams parameters (Profile Monitoring Section).
R&D to improve existing detection techniques and explore new avenues to allow further optimization of the current machines and to meet the challenges associated with future accelerators.
LHC section is responsible for the operation of the LHC Accelerator.
Undertaken activities include:
accelerator physics,
participation in machine studies,
writing software applications for accelerator control,
providing beam statistics.
Undertaken activities include:
accelerator physics,
participation in machine studies,
detector technology,
custom built electronics,
software engineering.

6. INVASIVE MEAS. MEASURE THE BEAM TRANSVERSE DISTRIBUTION
NON-INVASIVE MEAS.

7. INVASIVE MEAS. MEASURE THE BEAM TRANSVERSE DISTRIBUTION
NON-INVASIVE MEAS.
Wire passing across the beam, its position is read by a potentiometer.
Secondary emitted particles from the interaction, hit a scintillator generating photons.
Light detected by PMT creates the electric signal
By sampling 40 MHz, bunch by bunch measurement is obtained
Filters
Scintillator
Light
PMT
Electrical Signal
25 ns
Potentiometer

8. NON-INVASIVE MEAS. Synchrotron light emitted by accelerating particles
MEASURE THE BEAM TRANSVERSE DISTRIBUTION
NON-INVASIVE MEAS.
INVASIVE MEAS.
Beam Size
1.2 mm → µm
(450 GeV) → (7 TeV)
Synchrotron light emitted by accelerating particles
Carries information about the beam itself!
BEAM
5 T
Undulator
8 T
Bending Dipole
The Visible Light source is :
The undulator GeV <= E <~ 1 TeV
The BD rising Edge TeV <~ E <~ 2 TeV
The BD core E >~ 2 TeV
D > 30 m

9. NON-INVASIVE MEAS. 29 m MEASURE THE BEAM TRANSVERSE DISTRIBUTION

10. NON-INVASIVE MEAS. MEASURE THE BEAM TRANSVERSE DISTRIBUTION
SR Imaging
Beam Size
1.2 mm → µm
(450 GeV) → (7 TeV)
From the SR light profile, the proton bunch transverse size is deduced
BEAM
5 T
Undulator
8 T
Bending Dipole
2 Magnifying stages needed (object smaller that the diameter of human hair!)
Extremely high speed accurate intensified gated camera
Light Splitting
The Visible Light source is :
The undulator GeV <= E <~ 1 TeV
The BD rising Edge TeV <~ E <~ 2 TeV
The BD core E >~ 2 TeV
D > 30 m

14. a machine development period
MEASURE THE BEAM TRANSVERSE DISTRIBUTION
NON-INVASIVE MEAS.
INVASIVE MEAS.
BSRT images during
a machine development period

15. NON-INVASIVE MEAS. MEASURE THE BEAM TRANSVERSE DISTRIBUTION
SR Imaging
Beam Size
1.2 mm → µm
(450 GeV) → (7 TeV)
From the SR light profile, the proton bunch transverse size is deduced
BEAM
5 T
Undulator
8 T
Bending Dipole
2 Magnifying stages needed (object smaller that the diameter of human hair!)
Extremely high speed accurate intensified gated camera
Light Splitting
SR Interferometry
Double slits (variable slit width and spacing)
The Visible Light source is :
The undulator GeV <= E <~ 1 TeV
The BD rising Edge TeV <~ E <~ 2 TeV
The BD core E >~ 2 TeV
From the interference fringes visibility the partial incoherence of the source is measured, and thus the bunch transverse size.
D > 30 m

16. It does not matter how slowly you go as long as you do not stop.
Confucius
LHC SPS BEAM EMITTANCE BUNCH SIZE BUNCH LENGTH LUMINOISTY EVOLUTION
SYNCHROTRON RADIATION OPTICS IMAGING INTERFEROMETRY CORONAGRAPH HALO DIAGNOSTICS WIRESCANNERS BSRT INTENSIFIED GATED CAMERAS PHOTOMULTIPLIER TUBES MULTICHANNEL PLATES DIGITAL CAMERAS RADIATION EFFECTS AMPLIFIERS LASER SENORS