interdisciplinary activities with the mp orsay tandem
DESCRIPTION
Interdisciplinary activities with the MP Orsay Tandem. Marin CHABOT IPN Orsay France. - Atomic Beams. - High Energy Massive Cluster Beams. Light Carbon Cluster and Molecular Beams. Material modifications : Few days /year. Irradiation of material for studies on nuclear waste conditioning - PowerPoint PPT PresentationTRANSCRIPT
Interdisciplinary activities with the MP Orsay Tandem
Marin CHABOT IPN Orsay France
- Atomic Beams
- High Energy Massive Cluster Beams
- Light Carbon Cluster and Molecular Beams.
Atomic beams.
Electronic test for spatial device : Few weeks / years - business activity – )
Spatial materials are irradiated by Swift Heavy Ions Spatial Industry needs beam test process
to prove radiation hardness
- Irradiation of material for studies on nuclear waste conditioning( IPN radiochemistry group )
- Irradiation of astrophysical analogue produced in lab (Orsay University collaboration)
Material modifications : Few days /year
- …
High Energy C60 beams
material modification : 5-10 weeks / year
Many experiments have been performed since 1993 and the world’s first production of high energy C60 beams at the IPN. Nanodiamant production:
(CEA-Ecole Polytech. -IPN – A.Dunlop PRB(2007))
Graphite film
Very High stress is reached with C60 impact.
Elect. Micros.
Stable deposited nanodiamant
C60 track
Pre
ssur
e (G
Pa)
Pressure - temperature phase diagram of carbon
Damage and modification of material are governed by stopping power – electronics at high energy -
dE
/dx
(MeV
/(m
g/cm
2))
E (MeV)
C60
dE/dx for C60 is twice that for U
High energy Aun (n<400) Beamsd
E/d
x (M
eV/(
mg/
cm2))
E (KeV)
Material modification – Mass spectrometry tool – ( few day / year)
Orion LMIS Source at High Voltage terminal
10 100 1000
0,1
1
10
CN-
(M-H)-
(M2-H)-
AuCN2
-
Re
lati
ve
Yie
ld
Energy (qkeV)
Au100q
q+
AuCN2
-
Light cluster and molecular carbon beams
high velocity atomic collisions
10 m 3 m
1mm 1mm 1mm 0.15 mm
C3+
C3H+C3H2
+
C3H3+
+t=0 s
t ~ 0.1 fs
t < 100 ps
t < 10 ns
Atomic collision ( only electrons are concerned)
Electron-phonon coupling
Fragmentation
Molecular and atomic physic : few weeks / year
High velocity ( Vcol >>Ve- )
Cn, Sin,..
CnHm, NCn,..
Fragmentation spectroscopy : AGAT Multidetector
He
{Cp}
{Cq}+
Inverse kinematics scheme : 4 detection 100% efficient
Silicon
Energy
C10++He -> {Cp*}
Mass fragmentation partitions are fully resolved
C3
C/C
C/C/C
C2/C
C
C2
Pe
ak
Cu
rre
nt
Energy
Pulse shape Analysis on silicon current signal.
Chabot et al 2002
C5
C5 C4/C
C3/C
2
C3/2
C
2C2/
C
C2/3
C
5C0.00.10.20.30.40.50.60.7 (x10)
BR
0.000.010.020.030.040.050.060.07
BR
C8
C8 C7/C
C6/C
2C5
/C3
2C4
C6/2
CC5
/C2/
CC4
/C3/
CC4
/2C2
2C3/
C2C5
/3C
C4/C
2/2C
2C3/
2CC3
/2C2
/C4C
2C4
/4C
C3/C
2/3C
3C2/
2CC3
/5C
2C2/
4CC2
/6C
8C
(x10)
0.00.10.20.30.40.50.60.7
0.000.010.020.030.040.050.060.07
C6
C6 C5/C
C4/C
2C3
/C3
C4/2
CC3
/C2/
C3C
2C3
/3C
2C2/
2CC2
/4C
6C
0.00.10.20.30.40.50.60.7 (x10)
BR
0.000.010.020.030.040.050.060.07
C7
C7 C6/C
C5/C
2C4
/C3
C5/2
CC4
/C2/
C2C
3/C
C3/2
C2C4
/3C
C3/C
2/2C
3C2/
CC3
/4C
2C2/
3CC2
/5C
7C
0.00.10.20.30.40.50.60.7 (x10)
BR
0.000.010.020.030.040.050.060.07
Statistical behavior of highly excited small neutral carbon clusters
i (E) = [Nf ; {Mj, Zj, Sj, Lej, Gj, rj, j, pj,Lj, Ej}j=1,Nf ]
(M=mass, Z=charge, S=spin, Le= electronic orbital momentum, G= geometry, r= position, orientation , p=impulsion, L= kinetic momentum, Evibration energy.)
Martinet et al PRL04
Application of BR measurements to astrochemistry
Lot of hydrocarbons are observed in Interstellar Medium.
Branching ratio following electronic excitations are required to model the undergoing chemistry.
DR + UV CR
C4H around giant red star IRC 10216ISO observation
Effect of Statistical BR for Cn and CnH onHorse head chemistry calculation.
Tuna et al JCP08
Var
iatio
n in
cal
cula
tion
Conclusion
- Atomic beams
- Massive Cluster beams
-Light carbon and molecule beams.
Lot of Nice Interdisciplinary results