DE-302
- Overview
- Specifications
- Drawings
- Pictures
The DE-302 is our lowest base temperature closed cycle cryostat. The DE-302 uses a Joule Thompson (JT) circuit of ILL design as a 3rd cooling stage to achieve base temperatures below 1.7 K, with 40 mW of cooling power at 2 K.
The DE-302 system has the ARS manufactured DE-202 cryocooler at its heart precooling the helium gas. Like the DE-202*G the DE-302*G has the light weight and slim profile to fit on the Huber 5012.12 cryostat mount.
Applications
- X-ray Diffraction
- Neutron Scattering
- Resistivity
- Transport
- Non Optical
Features
- Closed Cycle Cryocooler With Open Cycle Joule
Thompson Circuit
(ILL design) - Sample in Static Exchange Gas, or in Vacuum
- Designed to Fit on a Huber Cryostat Carrier
- Cryogen Free
- Displex Pneumatically Driven Gifford-McMahon Closed Cycle Cryocooler Designed for Low Sample Vibrations
- Low Cife Cycle Cost
- Water Cooled ARS-2HW Compressor for Quiet and Clean Operation
Standard Components
- Cold head (DE-302AI)
- Compressor (ARS-2HW)
Superflex helium hoses.
- Vacuum shroud, non-optical or Beryllium dome
- Radiation shield, non-optical or Beryllium dome
- Instrumentation for sample temperature control:
- 10 pin hermetic feedthrough
- Durable metallized thermofoil heater
- Silicon diode sensor curve matched to (± 0.5 K) for control
- Calibrated Cernox sensor (± 5 mK) with 6 inch free length for accurate sample temperature monitoring
- Sample environment is static helium exchange gas. Copper can mounted to tip using indium gasket.
- Stainless steel gas capillaries for helium JT circuit.
- Diaphragm pump for JT circuit.
- Cold trap to remove trace amounts of contaminants from the helium gas stream.
Options and Upgrades
- Liquid nitrogen flask
- Helium regulator
- Vacuum pump system for the shroud
- 4 K Cold head (0.1 W @ 4.2 K)
- 5.5 K Cold Head (1 W @ 10 K)
- Turbo upgrade for faster cooldown times
The ARS Advantage
The DE-202SE cold head is a precision machine carefully tuned to achieve temperatures below 4 K with 0.1 W of cooling power at 4.2 K.
The DE-202AEcold head is a rugged workhorse built with power and durability in mind achieving temperatures below 9 K with 0.5 W of cooling power at 10 K.
The DE-202PE cold head is a hybrid of the the 4 K and 10 K philosophies achieving a balance that exhibits the best of both worlds, with temperatures below 5.5 K and 1 W of cooling power at 10 K.
From our standard offerings of single strand copper and low noise coaxial wiring packages, to any number of custom wiring configurations, our technicians painstakingly wrap each cold head for optimum thermal anchoring.
Typical instrumentation for temperature measurement and control include, one 36 ohm thermofoil heater, one curve matched silicon diode for rough temperature control, and one free length calibrated diode for direct attachment to the sample or sample holder for accurate temperature measurement. Silicon diode sensors are favored heavily for most standard applications, because of their low cost, durability, and stability, but we do offer a wide variety of other sensors for different applications such as Cernox sensors for high magnetic fields, E-type thermocouples for 4 K - 800 K measurements, and Platinum RTD's for accurate high temperature measurements.
Our wide selection of wiring and instrumentation is matched by an equally wide selection of temperature controllers from Cryocon, Lakeshore, and Scientific Instruments.
The water cooled ARS-2HW compressor that powers the DE-202 Series Cold heads has many benefits that are amplified in small laboratory settings. The water cooling redirects heat energy that would otherwise be dumped into the lab, by a large cooling fan. The lack of a large cooling fan also dramatically reduces the noise of these compressors (only 60 dBA). Additionaly with minimum air circulation, the air currents and dust are kept to a minimum. The high efficiency heat exchanger results in low water usage, and saves space inside the compressor giving it a small footprint. When water is not available our Coolpac™ remote recirculation system can send cooling water from up to 100ft away.
Cryocooler Specifications
| Cryocooler Model | DE-302AI | DE-202SI | |||
|---|---|---|---|---|---|
| Frequency | 60 Hz | 50 Hz | 60 Hz | 50 Hz | |
| Base Temperature | < 1.7 K | < 1.7 K | < 1.5 K | < 1.5 K | |
| Cooling Capacity- | 2 K | 40 mW | |||
| Stability at Set Point | 0.002 K | ||||
| Radiation Shield Cooling Capacity | 10 W | 8 W | 10 W | 8 W | |
| (1st Stage Cooling Capacity at 77K) | |||||
| Maximum Cylinder Temperature | 355 K | 355 K | |||
| Cooldown Time- | 20K | 50 min | 60 min | 60 min | 72 min |
| Base Temperature | 150 min | ||||
| Helium Gas Consumption (JT) | 1 l/min STP | ||||
| Weight | Expander | 7.1 kg (16 lbs) | 7.1 kg (16 lbs) | ||
| Compressor Model | ARS-2HW | ARS-4HW | |||
| Standard Voltage | Min | 208 V | 208 V | 208 V | 190 V |
| Max | 230 V | 220 V | 230 V | 210 V | |
| Power Usage | Singe Phase | 1.3 kW | 1.2 kW | 3.6 kW | 3.0 kW |
| Dimensions: | L | 483 mm (19 in) | 483 mm (19 in) | ||
| W | 434 mm (17.1 in) | 434 mm (17.1 in) | |||
| H | 516 mm (20.3 in) | 516 mm (20.3 in) | |||
| Weight | Compressor | 62 kg (137 lbs) | 73 kg (160 lbs) | ||
| Typical Maintenance Cycle | 12,000 hours | 12,000 hours | |||
Vibration Levels
CS302*I-HMX-2D
1.7 K Cryostat with Beryllium Domes
for X-ray diffraction
CS302*I-HMX-3
1.7 K Cryostat for Electrical Experiments
DE-302
A Typical 1.7 K Installation Diagram
ARS-2HW
Compressor
Click on the Images for full size