/DFS/LASER

Block Format Keyword

/DFS/LASER – Laser Beam Impact

Description

Enable to model laser impact taking into account laser-matter interaction. (Comment 1)

Format

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

/DFS/LASER/laser_ID

SLAS

fct_IDLAS

STAR

fct_IDTAR

VCp

IEL1

IEL2

IEL3

IEL4

IEL5

IEL6

IEL7

IEL8

IEL9

IEL10

IEL11

…

IELNp

Field	Contents	SI Unit Example
laser_ID	Laser line identifier (Integer, maximum 10 digits)
SLAS	Laser intensity scale factor (Real)
fct_IDLAS	Laser intensity time function number (Real)
STAR	Target absorption scale factor (Real)
fct_IDTAR	Target absorption temperature function number (Integer)
Hn	Plasma parameter h is the Planck constant kB is the Boltzmann constant v is the laser frequency (Real)
VCp	Enthalpy of vaporization (Real)
K0	Inverse bremsstrahlung coefficient K0 (Comment 6) (Real)
Rd	Inverse bremsstrahlung coefficient (Comment 6) (Real)
KS	Compliment absorption in vapor (Comment 5) (Real)
Np	Number of plasma elements between laser and target (Integer)
Nc	Target element number (Comment 1) (Integer)
IELi	List of plasma elements (i=1,…, Np) (Comment 3) (Integer)

1.	Laser-matter interaction requires material laws enabling different phases: solid, liquid, and gas. It also needs to have a correct behavior with high pressure (several megabars) and high temperatures (more than 10000K). SESAME material law must also be used.

2.	This option is available only in 2D analysis.

3.	Plasma elements must be entered in the order from laser to target.

4.	It is assumed the laser beam is perpendicular to the target.

5.	is taken from K. Daree’s plasma ignition model.

I-absorbed-eq2

Usually, K0 = 9.468e-4 m5 and Rd/k = 157750 K.