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