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ЯЧЕЙКА "COLD LIP" |
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Al (& other PBN wetting materials)
- Reduction of Al overflow
- Increase of Al charge
- Optimized beam reproducibility & stability
- Hot Zone designed for materials wetting PBN
- Compatible with most MBE systems
- Compatible with commonly used power units
- Optional integrated / cooling shutter
- Wide range of crucible capacities
- Inserts and special configurations
- Modular design
- Double thermocouple
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The curve illustrate the "Cold Lip" effect generated by the bottom only filament cells and the Hot Zone / Cold Zone Addon design.
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Average power consumption for cold lip cells |
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OPERATION:
Evaporating aluminum with a standard effusion cell presents several shortcomings. In wetting the crucible, aluminum can overflow and sometimes break it (in contrast to other group III ELEMENTS THE VOLUME OF ALUMINUM EXPANDS WHILE SOLIDIFYING). Whilst the user can reduce the chances of such an eventuality by drastically decreasing the aluminum load in the crucible it is not an ideal solution.
To solve these problems, ADDON has developed a "cold lip" cell, specially designed for such materials. In these cells the aluminum load can be increased with the risk of breaking the crucible greatly reduced.
In these cells, heating is intentionally non uniform in order to maintain a negative temperature gradient between the bottom and the lip of the crucible. Experiments show a strong decrease in observed aluminum wetting and overflow.
This is a result of the special geometry and heating pattern of the hot zone combined with the heat shielding of the cell.
CRUCIBLES:
Experiments show that crucibles with low tap angle are more resistant to dilatation forces encountered during the aluminum solidification process. If possible, it is better to use, therefore, a non conic-shaped crucible equipped with an insert to establish a homogenous and uniform beam.
Compatibility:
The cell is available in models fully compatible with existing systems manufactured by Varian, VG, EPI, Perkin-Elmer, Ulvac, Anelva and Riber. Other versions are available on request (please provide us with flange size, connecting tube I.D. and in vacuum length).
Thermocouples:
The cell is equipped with a double thermocouple. The C type (W/Re) is standard. Others are available by special order.
Integrated shutter:
An integrated shutter mechanism can be fitted on most of the cells described here.
Integrated cooling circuit:
If necessary a water cooling circuit can be integrated on most of the cells described here.
VG compatible cells include the cooling circuit as a standard feature.
SPECIFICATIONS:
| Filament: |
One |
| Maximum Operating Temperature: |
1 400 °C |
| Maximum Outgassing Temperature: |
1 600 °C |
| Temperature Stability: |
better than +/- 0.1 °C |
| Thermocouples: |
Double C type (W Re 5/26%) |
MINIMUM MOUNTING FLANGE
Crucible Capacity: |
25 35 40 58 35CF / 70mm / 2.75"
60 70 85 125 150 63CF / 114 mm / 4.5" |
| In-Vacuum Diameter: |
Crucible O.D plus 0.2 mm |
| In-Vacuum Length: |
200 to 400 mm. Please contact us for other values. |
| Temperatures / Power Consumption: |
See curves |
| Power Supply Connectors: |
System or ADDON |
| OPTION: |
-Other types of thermocouples
-Integrated cooling circuit
-Integrated shutter
-Inserts |
| WARRANTY: |
Two years: see product policy section |
Thermocouples: For low vapor pressure materials (group III for example) the C type thermocouple is recommended. For higher vapor pressure materials the K type is recommended if the maximum operating is lower than 800°C.
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See also Hot Zone / Cold Zone Cells
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MBE
Manufacturer |
MBE
Model Number |
Min
Connecting Flange |
Crucible Capacity (cc) |
Cell
Model Number |
Crucible
Model Number |
| RIBER |
1000/32/2300 |
DN40CF
2,75" (70mm) |
10
25
35
58 |
CL10RB1
CL25RB2
CL35RB3
CL58RB3 |
835010
835025
835035
835058 |
| EPINEAT COMPACT 21 |
DN63CF
4" (114 mm) |
90 |
CL90RE |
763090 |
DN63CF
4" (114 mm) |
60 |
CL60RE |
700260 |
DN100CF
6" (152 mm) |
60 |
CL260RE |
700260 |
| 48/49 |
DN150CF
10" (254 mm) |
700
1200 |
CL700R8
CL1200R8 |
700700
800120 |
| VG
All cells except 70 cc have Integrated Water Cooling
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Integrated water cooling |
DN63CF
4" (114 mm) |
30
40
70
85
150 |
CL30VG8
CL40VG8
CLCL0VG8
CL85VG8
CL150VG8 |
763030
763040
763070
763085
863150 |
| V90 |
DN63CF
4" (114 mm) |
30
40
70
85
150 |
CL30VG9W
CL40VG9W
CL70VG9
CL85VG9W
CL150VG9W |
763030
763040
763070
763085
863150 |
| V100 |
DN40CF
2,75" (70 mm) |
200
285
500 |
CL200VG1W
CL285VG1W
CL500VG1W |
700200
700285
800500 |
| Varian / Intervac |
Gen II |
DN40CF
2,75" (70mm) |
16
40 |
CL16VG2
CL40VG2 |
763016
863040 |
| Mod Gen II |
DN63CF
4" (114 mm) |
60
125 |
CL60VA3
CL125VA3 |
763060
863125 |
Others
and manufacturers not listed above Integrated Water Cooling is a factory option* |
Flange Size |
DN40CF
2,75" (70 mm) or higher |
6
10
20
25
35
58 |
CL06AD
CL10AD
CL20AD
CL25AD
CL35AD
CL58AD |
83506
835010
835020
835025
835035
835058 |
| Flange Size |
DN63CF
4" (114 mm)
or higher |
30
40
70
85
90
150 |
CL30AD
CL40AD
CFL70AD
CL85AD
CL90AD
CL150AD |
763030
763040
763070
763085
763090
863150 |
| Flange Size |
DN100CF
6" (152 mm)
or higher |
200
285
500 |
CL200AD
CL285AD
CL500AD |
700200
700285
800500 |
| Flange Size |
DN150CF
10" (254 mm)
or higher |
700
1200 |
CL700AD
CL1200AD |
700700
800120 |
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* When needed Integrated Water Cooling can be added as a factory option (W).
Do not hesitate to contact ADDON if your system is not listed above or if your system is a custom designed one. |
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