Stirling Cryogenic Engineering GmbH, Germany


Highpurity Germanium-Detectorsystem SCE-DBS-P-3021 with Stirling-Cooling

	Specification
	Technical Data
	Foto

Specification

Stirling cooler

For cooling, we use a duplex split Stirling cooler that has proven itself over many years under extreme application conditions. Its linear-driven compressors were designed to guarantee years of maintenance-free service. The MTS 3.5 normally operates in a vertical position; a horizontal-position model can however be special ordered.

Vibration isolation unit

For a detector system that is sensitive to microphonic effects to operate properly, a vibration isolation unit must be installed between the Stirling cooler and the detector. Our vibration isolation unit has excellent damping properties. The measuring parameters that result when our vibration isolation unit is used with microphonically-sensitive semiconductor detectors are comparable to those for detectors that are cooled with liquid nitrogen. The vibration isolation unit was integrated together with all necessary components such as the vacuum value, pressure sensor, fan and Stirling cooler in a stable case in a maintenance-friendly way.

Power supply unit and control element

To ensure the safe operation of the cryogenic cooling system, it is necessary to have a power supply unit and control element that offer the entire system constant protection, even in remote parts of the world. (during global measuring activities). Moreover, the power supply unit can be operated with various line voltages and frequencies (such as with an emergency generator) without difficulty. Battery operation is possible at any time when switched over to external batteries (min. 50 Ah). Operating data such as present power consumption for the Stirling cooler, compressor current, detector temperature and hours run are constantly monitored. Upon request, we also offer a small, reasonably-priced hand-held measuring instrument that can be connected to the standard built-in vacuum sensor via a plug-in connection. The integrated programmable thermostat can regulate the detector's temperature across broad ranges. There is also a recorder port and alarm contact for the detector temperature. Together, the power supply unit and control element comprise a portable, 19-inch case that is connected to the cooling unit by a 5-meter cable. Longer cables are available upon request.

The detector

The detector consists of a type P highpure germanium crystal that has been optimally adapted to the cooling system by means of a special cryostat construction. The resulting technical improvements in the vacuum make it possible to cool down the detector immediately and at short notice during measuring activities. The detector operates with a relative efficiency of more than 30 %, making it suitable for most - including mobile - applications.

Technical information subject to change © SCE-GmbH, Germany 1998

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Technical Data

The MTS 3.5 Micro Cryogenic System

Mains operation

Mains supply 85 - 264 VAC / 47 - 63 Hz frequenzy

Power consumption Cool-down
185 W

Normal operation
55 W

Battery operation

Battery 10,5 - 16 V DC, min. 50 Ah

Power consumption Cool-down
180 W

Normal operation
55 W

Loudness level Compareable to a PC fan (approx. 40dB)

Cooling temperatur directly adjustable

Ambient temperature -15 °C to +45 °C

Compresser type linear-driven duplex split Stirling

Operation position Vertical (standard),
Horizontal (special order)

Ports

Detector temperature 0-20mA, 0-10V

Compressor current K1/K2: 0-200 mV

Temperatur alarm Break or make contact; floating

Detectorsystem DBS-P-3021

P-Type-Highpurity germanium detector

Relative efficiency 30%

Resolution at 1,3 MeV < 2,1 keV

Resolution at 122 keV < 1,2 keV

Peak/Compton 53

End bell diameter 93 mm

Preamplifier input stage FET-cooled and low microphonic effect

Charge-sensitive preamplifier With resistance feedback, including connection cable that confirmed with NIM standards

Dimensions

Detector and cooling system 230 mm in diameter, 475 mm in lengh

Combined power supply unit and control element 19-inch housing with handle,
449 mm x 133 mm x 386 mm (W x H x D)

Weight

Detector and cooling system Approx. 17 kg

Combined power supply unit and control element Approx.13 kg

Accessories

Hand-held measure instrument for the Mikro-Pirani-Sensor

Principle of measurement Measuring bridge with controlled overtemperature

Range Indicating range: < 10^-4 to > 80 hPa (air)

Measure-value display / output Four-character display and PC interface

Operation mode Battery and mains

Ambient temperature + 10 °C bis +40 °C

Dimensions Approx. 193 mm x 99 mm x 45 mm

Weight Approx. 300 g (without battery)

Technical information subject to change © SCE-GmbH, Germany 1998

back


Specification

Stirling cooler
For cooling, we use a duplex split Stirling cooler that has proven itself over many years under extreme application conditions. Its linear-driven compressors were designed to guarantee years of maintenance-free service. The MTS 3.5 normally operates in a vertical position; a horizontal-position model can however be special ordered.

Vibration isolation unit
For a detector system that is sensitive to microphonic effects to operate properly, a vibration isolation unit must be installed between the Stirling cooler and the detector. Our vibration isolation unit has excellent damping properties. The measuring parameters that result when our vibration isolation unit is used with microphonically-sensitive semiconductor detectors are comparable to those for detectors that are cooled with liquid nitrogen. The vibration isolation unit was integrated together with all necessary components such as the vacuum value, pressure sensor, fan and Stirling cooler in a stable case in a maintenance-friendly way.

Power supply unit and control element
To ensure the safe operation of the cryogenic cooling system, it is necessary to have a power supply unit and control element that offer the entire system constant protection, even in remote parts of the world. (during global measuring activities). Moreover, the power supply unit can be operated with various line voltages and frequencies (such as with an emergency generator) without difficulty. Battery operation is possible at any time when switched over to external batteries (min. 50 Ah). Operating data such as present power consumption for the Stirling cooler, compressor current, detector temperature and hours run are constantly monitored. Upon request, we also offer a small, reasonably-priced hand-held measuring instrument that can be connected to the standard built-in vacuum sensor via a plug-in connection. The integrated programmable thermostat can regulate the detector's temperature across broad ranges. There is also a recorder port and alarm contact for the detector temperature. Together, the power supply unit and control element comprise a portable, 19-inch case that is connected to the cooling unit by a 5-meter cable. Longer cables are available upon request.

The detector
The detector consists of a type P highpure germanium crystal that has been optimally adapted to the cooling system by means of a special cryostat construction. The resulting technical improvements in the vacuum make it possible to cool down the detector immediately and at short notice during measuring activities. The detector operates with a relative efficiency of more than 30 %, making it suitable for most - including mobile - applications.

Technical information subject to change	© SCE-GmbH, Germany 1998
back


Technical Data
The MTS 3.5 Micro Cryogenic System

Mains operation
Mains supply	85 - 264 VAC / 47 - 63 Hz frequenzy
Power consumption	Cool-down	185 W
	Normal operation	55 W

Battery operation
Battery	10,5 - 16 V DC, min. 50 Ah
Power consumption	Cool-down	180 W
	Normal operation	55 W
Loudness level	Compareable to a PC fan (approx. 40dB)
Cooling temperatur	directly adjustable
Ambient temperature	-15 °C to +45 °C
Compresser type	linear-driven duplex split Stirling
Operation position	Vertical (standard), Horizontal (special order)

Ports
Detector temperature	0-20mA, 0-10V
Compressor current	K1/K2: 0-200 mV
Temperatur alarm	Break or make contact; floating

Detectorsystem DBS-P-3021

P-Type-Highpurity germanium detector
Relative efficiency	30%
Resolution at 1,3 MeV	< 2,1 keV
Resolution at 122 keV	< 1,2 keV
Peak/Compton	53
End bell diameter	93 mm
Preamplifier input stage	FET-cooled and low microphonic effect
Charge-sensitive preamplifier	With resistance feedback, including connection cable that confirmed with NIM standards

Dimensions
Detector and cooling system	230 mm in diameter, 475 mm in lengh
Combined power supply unit and control element	19-inch housing with handle, 449 mm x 133 mm x 386 mm (W x H x D)

Weight
Detector and cooling system	Approx. 17 kg
Combined power supply unit and control element	Approx.13 kg

Accessories

Hand-held measure instrument for the Mikro-Pirani-Sensor
Principle of measurement	Measuring bridge with controlled overtemperature
Range	Indicating range: < 10^-4 to > 80 hPa (air)
Measure-value display / output	Four-character display and PC interface
Operation mode	Battery and mains
Ambient temperature	+ 10 °C bis +40 °C
Dimensions	Approx. 193 mm x 99 mm x 45 mm
Weight	Approx. 300 g (without battery)

Technical information subject to change	© SCE-GmbH, Germany 1998
back