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Vacuum controll
A vacuum controll instruments are implemented in the cryostat. As a pump functions the HighCube 80eco, as a sensor a PKR 251 connected to a TPG361 is used, all from PFEIFFER Vacuum. A solenoid valve is implemented in the system to separate the cryostat from the pump. As a solenoid valve funtions the 0211 from Bürkert, it is a normally closed device, meaning applying energy will open the device. If it's Powered on it connects the pump to the chamber. Furthermore, the vacuum pump and the solenoid valve are both controlled via the PDU, while the single gauge is controlled via a LabVIEW Script via the server.
Starting Procedure
First turn the vacuum pump on, and then make sure that the Turbomolacularpump is turned off. Only start the vacuum pump when you are sure that the Turbo is off, then start the compressor pump, when the pressure reaches the lower single digits (5 mbar >) turn the Turbomolacularpump on.
TPG 361
The pressure within the Cryostat is monitored with a Single Gauge TPG361 from Pfeiffer Vaccum, which uses a PKR 251 FPM-sealed, DN 25 ISO-KF gauge sensor. The maximum pressure applies to inert gases and temperatures below 55 °C and is corrosion resistant. The TPG361 is designed for installation to a 19“ rack chassis adapter according to DIN 41494 and provides serial communication via R485 (24V, 5-pin circular), USB and Ethernet interfaces.It is used to measure the pressure inside the chamber.
- Front panel Operation: Manual
- Supported Commands: Communication protocol
| Characteristic | TPG 361 |
|---|---|
| Pressure Sensor Type | Piezo-resistive Pressure Sensor |
| Operating Principle | Resistive change due to pressure applied, converts pressure into electrical signal |
| Resolution | 0.01% of full scale |
| Measuring Range | 10 mbar to 1000 bar |
| Minimum Sensing Value | 10 mbar |
HighCube 80 eco
The HighCube 80 eco from Pfeiffer is uses as a turbumolacular vacuum pump. It allows for a pressure range below 10e(-7)pa. It is possible to remote controll the pump, for this a RS-485 to LAN converter is installed (Moxa Serial LAN device).
| Characteristic | HighCube 80 Eco |
|---|---|
| Pressure Sensor Type | Capacitive Pressure Sensor |
| Operating Principle | Absolute pressure measurement, capacitive sensing element detects pressure variations |
| Resolution | 0.1 mbar |
| Measuring Range | 1 mbar to 1000 bar |
| Minimum Sensing Value | 1 mbar |
* Manual
Flowchart
For better understanding on how the different components of the vacuum subsystem are linked together, the following scheme is provided:
Vacuum system configuration
The Pfeiffer Vacuum's HighCube 80eco consist of multiple subsystem, in the following table it is shown which setup uses what kind of subsystem:
| Subsystem | DAMIC-M@Zurich | DARMA | ||||
|---|---|---|---|---|---|---|
| Name | Model Nr. | Manuals | Name | Model Nr. | Manuals | |
| Roughening Pump | MVP 015-2 | Not visible | MVP 015-2 | Not visible | ||
| Turbomolecular Pump | High Pace 80 | PM P03 940A | Operational Instructions | High Pace 80 | PM P03 940A | Operational Instructions |
| Power Supply Unit | TPS110 | PM 061 340-T | TPS110 manual | Not visible | ||
| Control Unit | TC110 | PM C01 790 A | Operation Instructions | TC110 | PM C01 790 A | Operation Instructions |
| Venting Valve | Power Failure Vent | PM Z01 330 A | Vent Valve manual | Power Failure Vent | PM Z01 330 A | Vent Valve manual |
| Cooling Fan | Air cooling Kit 24V | PM Z01 300 A | Air cooling manual | Air cooling Kit 24V | PM Z01 300 A | Air cooling manual |
| Front control Panel | DCU002 | PM 061 348 AT | DCU002 | DCU002 | PM 061 348-T | DCU002 |
| Gauge | TPG261 | TPG28030 | TPG261 Manual and Communication | TPG361 | PT G28 040 | TPG361 Communication Protocol manual |
| Vacuum Sensor | PKR251 | 2000006133 / PT R26 000 | PKR251 manual | PKR251 | PTR26000 | PKR251 manual |
