TCS Radiative Cooling

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TCS Radiative Cooling

Post  Alessandro on Fri Dec 12, 2008 1:51 am

Simulation n.00

Values of the used parameters:

Power of the laser125W
Finesse FP AdVirgo885
Emissivity cold surface1.0
Emissivity covering and substrate
0.89
Inner beam cold surface0.150m
Beam of the mirror
0.175m
Thickness cold surface
0.025m
Distance cold surface from the coating0.010m
Length cold surface0.300m
Temperature cold surface200K
Temperature mirror295K
Angle between axis mirror and cold surface0.0°
Scheme base of the simulation:



Course of the temperature in 3D:



The used data belong to the file “ss.txt” produced from ANSYS.

Course of the temperature along the beam:



"Yi" (depth) is the coordinate of the "nodes" of the ANSYS elements.
Every curve represents the course of the temperature to varying of the beam of the mirror.
Every curve belongs to a fixed coordinate "Yi". This generates of the just discontinuities between the succession of curves.

The curve more low corresponds to the course of the temperature on the surface of the mirror interacting with the laser.
We can notice a not favorable course. In fact, considering the surface of the mirror hit from the laser, the
temperature value smaller is not found to the center of the surface.
This could depend from the temperature of the surface of base of the cold surface.

Course of the temperature along the depth:



In this case every curve has like fixed parameter coordinate "Xi".
Not there are unfavorable courses, to the center of the mirror and on
the surface of the mirror hit from the laser the temperature is more
low.
To increasing of beam ("Xi") the temperature increases with an acceptable course.

Successive steps of simulation:

  1. Reduction of the disturbance of the temperature of the surface of base of the cold surface.
  2. Control of the points of the diagram 3D.
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Simulation n.01

Post  Alessandro on Fri Dec 12, 2008 11:21 pm

Simulation n.01

Values of the used parameters:

Power of the laser125W
Finesse FP AdVirgo885
Emissivity cold surface1.0
Emissivity covering and substrate
0.89
Inner beam cold surface0.175m
Beam of the mirror
0.175m
Thickness cold surface
0.005m
Distance cold surface from the coating0.010m
Length cold surface0.300m
Temperature cold surface200K
Temperature mirror295K
Angle between axis mirror and cold surface0.0°
Scheme base of the simulation:



Course of the temperature in 3D:



The used data belong to the file “ss.txt” produced from ANSYS.
Not there are improvements.

Course of the temperature along the beam:



The course remains not favorable.
Al center of the mirror on the surface of the mirror hit from the
laser, in the Sim01, the temperature turns out greater regarding that
of the Sim00.

Course of the temperature along the depth:



Observations:

  1. The cooling effect is smaller of about 1K.
  2. The temperature of the base of the cold surface has a negligible effect in the Sim00 and the Sim01.
Successive steps of simulation:

  1. Variation of the angle between axis mirror and cold surface.
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Simulation n.02

Post  Alessandro on Tue Dec 16, 2008 7:40 pm

Simulation n.02

Values of the used parameters:

Power of the laser125W
Finesse FP AdVirgo885
Emissivity cold surface1.0
Emissivity covering and substrate
0.89
Inner beam cold surface0.150m
Beam of the mirror
0.175m
Thickness cold surface
0.025m
Distance cold surface from the coating0.010m
Length cold surface0.300m
Temperature cold surface200K
Temperature mirror295K
Angle between axis mirror and cold surface20.0°
Course of the temperature along the beam:



Last edited by Alessandro on Tue Dec 16, 2008 7:48 pm; edited 1 time in total
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Simulation n.03

Post  Alessandro on Tue Dec 16, 2008 7:46 pm

Simulation n.03

Values of the used parameters:

Power of the laser125W
Finesse FP AdVirgo885
Emissivity cold surface1.0
Emissivity covering and substrate
0.89
Inner beam cold surface0.150m
Beam of the mirror
0.175m
Thickness cold surface
0.025m
Distance cold surface from the coating0.010m
Length cold surface0.150m
Temperature cold surface200K
Temperature mirror295K
Angle between axis mirror and cold surface20.0°
Course of the temperature along the beam:

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Simulation n.04

Post  Alessandro on Tue Dec 16, 2008 8:00 pm

Simulation n.04

Values of the used parameters:

Power of the laser125W
Finesse FP AdVirgo885
Emissivity cold surface1.0
Emissivity covering and substrate
0.89
Inner beam cold surface0.200m
Beam of the mirror
0.175m
Thickness cold surface
0.025m
Distance cold surface from the coating0.010m
Length cold surface0.400m
Temperature cold surface200K
Temperature mirror295K
Angle between axis mirror and cold surface0.0°
Course of the temperature along the beam:




Last edited by Alessandro on Tue Dec 16, 2008 8:05 pm; edited 1 time in total
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Simulation n.05

Post  Alessandro on Tue Dec 16, 2008 8:05 pm

Simulation n.05

Values of the used parameters:

Power of the laser125W
Finesse FP AdVirgo885
Emissivity cold surface1.0
Emissivity covering and substrate
0.89
Inner beam cold surface0.175m
Beam of the mirror
0.175m
Thickness cold surface
0.025m
Distance cold surface from the coating0.030m
Length cold surface0.400m
Temperature cold surface200K
Temperature mirror295K
Angle between axis mirror and cold surface0.0°
Course of the temperature along the beam:


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Simulation n.06

Post  Alessandro on Tue Dec 16, 2008 10:41 pm

Simulation n.06

Values of the used parameters:

Power of the laser125W
Finesse FP AdVirgo885
Emissivity cold surface1.0
Emissivity covering and substrate
0.89
Inner beam cold surface0.175m
Beam of the mirror
0.175m
Thickness cold surface
0.025m
Distance cold surface from the coating0.100m
Length cold surface0.400m
Temperature cold surface200K
Temperature mirror295K
Angle between axis mirror and cold surface7.0°
Course of the temperature along the beam:


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Simulation n.07

Post  Alessandro on Tue Dec 16, 2008 10:42 pm

Simulation n.07

Values of the used parameters:

Power of the laser125W
Finesse FP AdVirgo885
Emissivity cold surface1.0
Emissivity covering and substrate
0.89
Inner beam cold surface0.175m
Beam of the mirror
0.175m
Thickness cold surface
0.025m
Distance cold surface from the coating0.100m
Length cold surface0.400m
Temperature cold surface200K
Temperature mirror295K
Angle between axis mirror and cold surface-5.0°
Course of the temperature along the beam:


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Simulation n.08

Post  Alessandro on Tue Dec 16, 2008 10:44 pm

Simulation n.08

Values of the used parameters:

Power of the laser125W
Finesse FP AdVirgo885
Emissivity cold surface1.0
Emissivity covering and substrate
0.89
Inner beam cold surface0.200m
Beam of the mirror
0.175m
Thickness cold surface
0.025m
Distance cold surface from the coating0.060m
Length cold surface0.400m
Temperature cold surface200K
Temperature mirror295K
Angle between axis mirror and cold surface5.0°
Course of the temperature along the beam:


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Simulation n.09

Post  Alessandro on Tue Dec 16, 2008 10:46 pm

Simulation n.09

Values of the used parameters:

Power of the laser125W
Finesse FP AdVirgo885
Emissivity cold surface1.0
Emissivity covering and substrate
0.89
Inner beam cold surface0.200m
Beam of the mirror
0.175m
Thickness cold surface
0.025m
Distance cold surface from the coating0.060m
Length cold surface0.400m
Temperature cold surface200K
Temperature mirror295K
Angle between axis mirror and cold surface0.0°
Course of the temperature along the beam:


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Simulation n.10

Post  Alessandro on Tue Dec 16, 2008 10:47 pm

Simulation n.10

Values of the used parameters:

Power of the laser125W
Finesse FP AdVirgo885
Emissivity cold surface1.0
Emissivity covering and substrate
0.89
Inner beam cold surface0.200m
Beam of the mirror
0.175m
Thickness cold surface
0.025m
Distance cold surface from the coating0.060m
Length cold surface0.800m
Temperature cold surface200K
Temperature mirror295K
Angle between axis mirror and cold surface0.0°
Course of the temperature along the beam:


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Simulation n.11

Post  Alessandro on Tue Dec 16, 2008 10:49 pm

Simulation n.11

Values of the used parameters:

Power of the laser125W
Finesse FP AdVirgo885
Emissivity cold surface1.0
Emissivity covering and substrate
0.89
Inner beam cold surface0.150m
Beam of the mirror
0.175m
Thickness cold surface
0.025m
Distance cold surface from the coating0.060m
Length cold surface0.800m
Temperature cold surface200K
Temperature mirror295K
Angle between axis mirror and cold surface0.0°
Course of the temperature along the beam:



Observations:

  1. Better course between sim00 and the sim11, effect of cooling in decrease.
  2. We must verify the course with the method of the fit.
Successive steps:


  1. To continue with the simulations.
  2. Study of the file " sstru.txt" , ROC, optical way, " coupling losses".
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Next steps

Post  Alessio on Fri Jan 09, 2009 2:13 pm

My opinion is that the next steps should follow this order:
1) Optical Path Lenght calculation
2) Coupling Losses calculation
3) Structural analisys (calculation of the TM ROC)
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Development OPL - In Sim00

Post  Alessandro on Tue Mar 10, 2009 5:45 pm

Setting Sim00.
Variation of the parameter T of the cooling system.
The minimum values for the OPL are in bold.

T(K)|Diff-OPL(m)|
max

Increase-OPL(m)
max/min
2300.4500e-5
(-1.50/-1.90)e-5
2602.0000e-6
(-8.50/-10.60)e-6
280
1.0000e-6
(-3.80/-4.50)e-6
2842.6016e-7
(-2.70/-3.20)e-6
285
2.7011e-7
(-2.45/-2.86)e-6
286
2.9049e-7
(-2.15/-2.55)e-6
2873.1301e-7
(-1.90/-2.20)e-6
2883.3810e-7
(-1.53/-1.85)e-6
2904.0000e-7
(-8.00/-12.00)e-7
2924.5000e-7
(-0.50/-5.00)e-7


Last edited by Alessandro on Wed Mar 11, 2009 2:27 pm; edited 3 times in total
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Development OPL - In SimNoCooling

Post  Alessandro on Tue Mar 10, 2009 6:14 pm

Presence of the laser.
Room temperature.

T(K)Diff-OPL(m)
max

Increase-OPL(m)
min/min
2957.4e-7
(3.6/11.0)e-7
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ROC - Fit in: No Cooling/Laser - NoCooling - and Sim00

Post  Alessandro on Wed Mar 11, 2009 4:29 pm

Estimation of ROC:
T is the temperature of the cooling system

Formula used in this fit: F(x) = a*X^2 + b*X + c
(the values of b are negligible)

Formula for calculating the ROG: ROC = 1/(2a)

T(K)Setting
ROC (m)

No - Laser
No-Cooling
1416.029

Yes - Laser
No-Cooling
1413.227
(-2.802)
284
Sim00:
Yes - Laser
Yes-Cooling
1395.478
(-20.551)
292
Sim00:
Yes - Laser
Yes-Cooling
1314.405
(-101.624)
For a T = 292K, the variation of ROC is too high!


Last edited by Alessandro on Thu Mar 12, 2009 4:41 pm; edited 1 time in total
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OK

Post  Alessio on Thu Mar 12, 2009 11:55 am

Ok Alessandro. It seems you are converging.
Three things:

  1. it is ROC (Radius Of Curvature), not ROG
  2. the function used to evaluate the ROC is wrong: there must be no linear term F(x)=aX2+c
  3. Coupling losses!
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Something strange

Post  Alessio on Thu Mar 12, 2009 8:52 pm

Alessandro wrote:
T(K)Setting
ROC (m)

No - Laser
No-Cooling
1416.029

Yes - Laser
No-Cooling
1413.227
(-2.802)
284
Sim00:
Yes - Laser
Yes-Cooling
1395.478
(-20.551)
292
Sim00:
Yes - Laser
Yes-Cooling
1314.405
(-101.624)
I gave a better look at this table. There is something strange. The ROC should increase when the YAG only is on (row 3). How can it be that the ROC is smaller when the cooling system is less cold(rows 4 and 5)?
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Correction Table ROC

Post  Alessandro on Fri Mar 13, 2009 1:30 am

The problem was the linear term of the formula used in the fit.

Here are the correct values:

T(K)Setting
ROC (m)

No - Laser
No-Cooling
1416.029

Yes - Laser
No-Cooling
1422.879
(+6.850)
284
Sim00:
Yes - Laser
Yes-Cooling
1406.074
(-9.955)
292
Sim00:
Yes - Laser
Yes-Cooling
1418.037
(+2.008)
Now the change in the ROC is more acceptable.
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Observation

Post  Alessandro on Tue Apr 28, 2009 3:52 pm

With TM: T=295K and Cylinder: T0=294K I noticed that:
- If we exclude the laser the effect of cooling has an acceptable performance!
- The ROC (fit: 1415.23 m) is good!

Conclusion:
- The method of cooling is functional;
- The temperature has a parabolic distribution over the surface of the mirror, but it is not Gaussian!

Next Steps:
- New simulations with successive increments of the power of laser;
- see the limit of operation of the cooling system, depending on the laser power;
- Possible application of the method of directional cooling.
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