COMSOL 6.4 - Electrodeless Lamp

In the tree, select > .

Geometry 1

Line Segment 1 (ls1)

In the toolbar, click

and choose .

In the window for , locate the section.

From the list, choose .

Locate the section. From the list, choose .

In the text field, type 0.015.

Cubic Bézier 1 (cb1)

In the toolbar, click

and choose .

In the window for , locate the section.

In row , set to 0.015.

In row , set to 0.03.

In row , set to 0.025.

In row , set to 0.045.

Quadratic Bézier 1 (qb1)

In the toolbar, click

and choose .

In the window for , locate the section.

In row , set to 0.03.

In row , set to 0.045.

In row , set to 0.07.

Line Segment 2 (ls2)

In the toolbar, click

and choose .

In the window for , locate the section.

From the list, choose .

Locate the section. From the list, choose .

Locate the section. In the text field, type 0.07.

Convert to Solid 1 (csol1)

In the toolbar, click

and choose .

Click in the window and then press Ctrl+A to select all objects.

In the window for , click

Rectangle 1 (r1)

In the toolbar, click

In the window for , locate the section.

In the text field, type 0.004.

In the text field, type 0.05.

Rectangle 2 (r2)

In the toolbar, click

In the window for , locate the section.

In the text field, type 0.006.

In the text field, type 0.052.

Rectangle 3 (r3)

In the toolbar, click

In the window for , locate the section.

In the text field, type 0.007.

In the text field, type 0.053.

Chamfer 1 (cha1)

In the toolbar, click

button in the toolbar.

button in the toolbar.

On the object , select Point 3 only.

It might be easier to select the correct point by using the window. To open this window, in the toolbar click and choose . (If you are running the cross-platform desktop, you find in the main menu.)

In the window for , locate the section.

In the text field, type 1.5e-3.

Chamfer 2 (cha2)

In the toolbar, click

On the object , select Point 3 only.

In the window for , locate the section.

In the text field, type 2e-3.

Square 1 (sq1)

In the toolbar, click

In the window for , locate the section.

In the text field, type 0.001.

Locate the section. In the text field, type 0.0045.

In the text field, type 0.025.

Array 1 (arr1)

In the toolbar, click

and choose .

Select the object only.

In the window for , locate the section.

From the list, choose .

In the text field, type 5.

Locate the section. In the text field, type 5e-3.

button in the toolbar.

Definitions

Variables 1

In the toolbar, click

In the window for , locate the section.

Select Boundaries 8, 27, and 35–38 only.


Name	Expression	Unit	Description
Tinit	350[K]	K	Gas temperature
pinit	101325*(500E-3/760)[Pa]	Pa	Initial total pressure
lamp_power	80[W]	W	Lamp power
tf1	10		Trapping factor
tf2	1000		Trapping factor

Coil boundaries

In the toolbar, click

Select Domains 5–9 only.

In the window for , locate the section.

From the list, choose .

In the text field, type Coil boundaries.

Coil domains

In the toolbar, click

Select Domains 5–9 only.

In the window for , type Coil domains in the text field.

Boundary layers

In the toolbar, click

In the window for , locate the section.

From the list, choose .

In the text field, type Boundary layers.

Discharge

In the toolbar, click

Select Domain 4 only.

In the window for , type Discharge in the text field.

Since the molecular weights of the species are very different, activate the mixture diffusion correction.

Plasma (plas)

In the window, under click .

In the window for , locate the section.

Select the checkbox.

Select Domain 4 only.

The Plasma Chemistry Import feature

The next steps have instructions to use the feature to import a file that automatically creates the argon-mercury plasma chemistry.

The following is set or created automatically:

Species properties using

Reaction group features for argon and mercury

Surface reaction group features

The documentation accompanying the feature contains more information about the file structure and what can be set automatically.

Plasma Chemistry Import 1

In the toolbar, click

and choose .

In the window for , locate the section.

Browse to the model’s Application Libraries folder and double-click the file Ar_Hg_plasma_chemistry.txt.

The surface reactions used in the model were created automatically but it is still necessary to specify at which boundary they are going to exist.

Surface Reactions - Walls

In the window, click .

In the window for , locate the section.

From the list, choose .

Species: Hg

In the window, expand the > > node, then click .

In the window for , locate the section.

In the x0 text field, type 0.05.

Species: Hg1

In the window, click .

In the window for , locate the section.

In the x0 text field, type 2E-6.

Species: Hg2

In the window, click .

In the window for , locate the section.

In the x0 text field, type 1E-6.

Species: Hg3

In the window, click .

In the window for , locate the section.

In the x0 text field, type 5E-6.

Species: Hg4

In the window, click .

In the window for , locate the section.

In the x0 text field, type 1E-6.

Species: Hg5

In the window, click .

In the window for , locate the section.

In the x0 text field, type 5E-6.

Species: Hg6

In the window, click .

In the window for , locate the section.

In the x0 text field, type 1E-6.

Species: Ar

In the window, click .

In the window for , locate the section.

Select the checkbox.

Species: Ar+

In the window, click .

In the window for , locate the section.

In the n0 text field, type 1E16.

Species: Hg+

In the window, click .

In the window for , locate the section.

Select the checkbox.

Group - Species

In the window, collapse the > > node.

Plasma Model 1

In the window, click .

In the window for , locate the section.

From the list, choose .

Locate the section. In the T text field, type Tinit.

In the pA text field, type pinit.

Ground 1

In the toolbar, click

and choose .

In the window for , locate the section.

From the list, choose .

Wall 1

In the toolbar, click

and choose .

In the window for , locate the section.

From the list, choose .

Initial Values 1

In the window, click .

In the window for , locate the section.

In the ne,0 text field, type 1E17.

In the ε0 text field, type 2.

Magnetic Fields (mf)

In the window, under click .

Domain Coil 1

In the toolbar, click

and choose .

In the window for , locate the section.

From the list, choose .

Locate the section. Select the checkbox.

From the list, choose .

In the Pcoil text field, type lamp_power.

button in the toolbar.

Materials

Coils

In the window, under right-click and choose .

Select Domains 5–9 only.

In the window for , locate the section.


Property	Variable	Value	Unit	Property group
Electric conductivity	sigma_iso ; sigmaii = sigma_iso, sigmaij = 0	6e7	S/m	Basic
Relative permeability	mur_iso ; murii = mur_iso, murij = 0	1	1	Basic
Relative permittivity	epsilonr_iso ; epsilonrii = epsilonr_iso, epsilonrij = 0	1	1	Basic

In the text field, type Coils.

Ferrite

Right-click and choose .

Select Domain 1 only.

In the window for , locate the section.


Property	Variable	Value	Unit	Property group
Relative permeability	mur_iso ; murii = mur_iso, murij = 0	1e3	1	Basic
Electric conductivity	sigma_iso ; sigmaii = sigma_iso, sigmaij = 0	0	S/m	Basic
Relative permittivity	epsilonr_iso ; epsilonrii = epsilonr_iso, epsilonrij = 0	1	1	Basic

In the text field, type Ferrite.

Air

Right-click and choose .

Select Domain 2 only.

In the window for , locate the section.


Property	Variable	Value	Unit	Property group
Relative permeability	mur_iso ; murii = mur_iso, murij = 0	1	1	Basic
Electric conductivity	sigma_iso ; sigmaii = sigma_iso, sigmaij = 0	0	S/m	Basic
Relative permittivity	epsilonr_iso ; epsilonrii = epsilonr_iso, epsilonrij = 0	1	1	Basic

In the text field, type Air.

Dielectric

Right-click and choose .

Select Domain 3 only.

In the window for , locate the section.