Highlights

4 K Pulse Tube Refrigerator from SHI

Key features are: Cooling Capacity 1st 10/20 W at 45 K (50/60Hz) Vertical Position) 2nd 0.5 W at 4.2 K (50/60Hz) Lowest Temperature < 3.0 K Cool Down Time < 70 / 60 MIN. (50/60Hz) Absolute no moving parts in coldhead; unique design with rotary valve detachable via aeroquip allowing fast maintenance with system remaining at low temperatures. A complete overview of these PT and GM refrigerators you find here SHI-PT or SHI-GM Get your full data sheet and price contacting TECO René Koch (publ: 22 July 2003, update 09-06).

Cryogen-free Two Stage Adiabatic Demagnetization Refrigerator from Janis

A cryogen-free two stage adiabatic demagnetization refrigerator has been developed using a 4 K pulse tube cryocooler. Gallium Gadolinium Garnet (GGG) and Ferric Ammonium Alum (FAA) paramagnetic pills were used for the first and second stage of the ADR, with Kevlar string supports for each stage. The FAA stage reaches a base temperature below 50 mK, and remains below 100 mK for more than two days. Special highly conductive flexible thermal links are employed to intercept any vibration generated by the pulse tube cryocooler and its compressor. The performance of this cryo-cooled ADR is better (lower base temperature and longer hold time below 100 mK) than the equivalent liquid helium-based system. Design and performance details of the systems can be optained at TECO René Koch, or directly at Janis. (pub: 2 August 2002).

Single Stage Cryogen-free He-3 Cryostat

Janis has developed a cryogen-free He-3 cryostat, which uses a two stage G-M cryo-cooler for He-3 condensation. After the He-3 gas is condensed, an internal charcoal sorption pump is used to pump the He-3 pot down to near 300 mK. More information you can optain from TECO René Koch, or directly at Janis (Pub: 4 August 2002, updated 09-06).

Cryogen-free 6 T s.c. magnet

Cryomagnetics Inc. in Oak Ridge Tennessee offers a wide range of mechanically cooled superconduction magnets, with room temperature bore sizes of 100, 200, or 300 mm diameter. They offer the latest HTc persistent switch technology to run your cryogen-free magnets also in persistent mode. Fields are presently offered up to 9 Tesla. For more information contact TECO Rene Koch (pub 10 March 2003).

He3-He4 Dilution Refrigerator

The highly relable dilution refrigerator from Janis, model JDR-100 and JDR-500 complement our very low temperature product line. Key features: 10 mK base temperature 150 microW refrigeration capacity at 100 mK for the JDR-100 400 microW refrigeration capacity at 100 mK for the JDR-500 A complete overview of the two models are here JDR For pricing, contact TECO Rene Koch (pub 10 March 2003, update 09-06).

The World's Most Accurate Capacitance/Loss Bridge

Andeen-Hagerling, Inc. in Cleveland, OH, is well known for their capacitance bridges and standards. TECO Rene Koch is very proud to announce our new agreement to distribute their single frequency 1 kHz model AH2550A (picture) and the multi-frequency 50 Hz -20 kHz model AH 2700A bridge. Applications are widely spread in science; ultra-low temperature measurement and control, capacitance dilatometer for thermal expansion and magnetostriction, phase transitions in condensed matter materials, capacitive STM; to mention only a few of them. We would be very pleased to send you a more comprehensive application note (.PDF), full technical data you can also get here to the Andeen-Hagerling web site. For pricing details please send us an (pub 12 April 2003).

4 K Closed Cycle Refrigerators from Sumitomo Heavy Industries

A versatile, low cost 0.1 W@ 4.2K unit is added to the SHI family of cryo-coolers (0.5 W / 1.0 W / 1.5 W). This unit comes with a low power single-phase air-cooled compressor and is available also as turn key cryostat system assembled by Janis. Detailed technical information about 4 K refrigerators and cryostat are ready available via the links, pricing from TECO René Koch. (pub: 2 August 2002, update 09-06).

Model 370 AC Bridge from Lakeshore

The Model 370 AC Resistance Bridge is designed for precise, accurate, low noise, low excitation power AC resistance measurement. Its primary application is the measurement of resistance materials in cryogenic environments from 20 mK to 1K. Fully integrated, the Model 370 includes features to reduce and control noise at every step of the resistance measurement process. A unique, patent pending, matched impedance current source and active common mode reduction circuitry minimize noise and self-heating errors. With sixteen channels, IEEE-488 and serial interfaces, and closed loop temperature control, the Model 370 offers seamless integration with existing cryogenic systems and the most complete package on the market today. Used with calibrated Lake Shore subkelvin resistance temperature sensors, the Model 370 not only measures and displays but also controls (pub: 2 August 02). You can get our application note (pdf) to learn more about the unique design. Contact TECO René Koch, or visit Lakeshore for more information.

Helium Gas Recovery

The Helium Gas Recovery Systems have been a great success for our company over the past years. We offer a wide range of capacity units, manufactured by Bauer in Munich, from 5 m3/hour to 210 m3/hour; including different filter systems for water vapour and hydrocarbon residuals. The picture shows a 60 m3/h unit in super-silent execution with a custom made integrated water /air heat exchanger for efficient cooling of the compressor. Visible are the wall-mounted P-filter system and large condensation-collecting tank. Contact us for the brochure describing the different models, we also offer gas balloons, helium purifiers and helium liquefiers to keep you fully independent from external supplies.

High Resolution Superconducting Magnet Power Supply

Output Type: True Bi-polar DC Current Source (four-quadrant) Current Range: -60 A to +60 A (dual units in parallel for +/-120 A) Compliance Voltage: +/-5 V (both source and sink) Current setting and resolution: 0.1 mA (20 bit) Current Ramp Rate: 0.1mA/s to 99 A/s (system dependant) Full data and price are available at TECO René Koch (pub: 22 July 2003).

New 7400 series Vibrating Sample Magnetometer

Lake Shore's new 7400 series Vibrating Sample Magnetometer (VSM) is the most sensitive VSM available today. This VSM features a noise floor of 1 x 10-7 emu at 10 seconds/point sampling, 4 x 10-7 emu at 1 sec/pt. and 7.5 x 10-7 emu at 0.1 seconds/point. In addition to providing the lowest noise floor, this VSM's patented technology leads to a stability of 0.05% per day which surpasses the stability of any other commercial VSM. Models based on variable gap 4", 7" and 10" electromagnets are available providing field strengths to above 3 tesla, and variable gap magnets allow for easy reconfiguration of the magnet gap to accommodate large samples to 1" ( Pub: 02 August 02). Please click here for more information.

Lake Shore's new series 8400 complements the 7600 / 7700 / 9700 Hall Effect Measurement (HMS) Systems

Lake Shore's new series of AC/DC Field Hall Effect Measurement (HMS) systems combine a wide resistance range, high voltage capability, high magnetic field, and broad temperature range to provide the most capable electronic transport measurement systems available today from 10-3 to 106 cm2/Vs. The new series of HMS systems feature hardware with electromagnet and superconducting magnet based platforms that can measure samples with resistances ranging from 0.1 mW to 80 GW, provide fields to 9 tesla, temperatures from 2K to 800K, and accommodate samples up to 6" in diameter. New software features include Windows Explorer navigation interface, experiment profiles with multiple measurement steps and samples, complete details of every voltage measurement, predefined measurement sequences, offline data viewing, contact formation, and depletion layer corrections. The model 8404 offers a variable temperature range from 15K to 1273K all cryogen-free (Pub: 08 December 11). Please click here for more information.

The only Gaussmeter with DSP technology

We are pleased to introduce the most advanced Hall effect gaussmeter on the market today. Use of Digital Signal Processing allows the Model 475 to have unsurpassed capability by offering optimized measurements in three different modes: static DC fields, periodic AC fields, and momentary peak fields. The Model 475 has a DC accuracy of +/- 0.05% and 5 ¾ digit resolution. The AC measurement mode offers true DC to 50 kHz reading capability with low pass and band pass filtering. The Model 475 also has an extremely fast peak capture and a high-speed interface that can capture up to 1000 readings per second. Temperature indication, frequency indication, built-in field control, alarms and relays, IEEE-488 and serial interface, and analog voltage outputs are all standard features (Pub: 20 Feb 2003). For more information on the Model 475 DSP Gaussmeter, contact TECO René Koch.

Aluminum-fiberglass LHe Research Dewar

Precision Cryogenics located in Indianapolis is specialized in custom design and fabrication of non-magnetic vapor-shielded aluminum-fiberglass LHe Research Dewar; integrated µ-metal shields can be offered optionally. Also very attractive is the unsurpassed price/performance ratio on stainless steel bucket and belly LN2 and LHe Dewar we can offer on relative short deliveries. Cryogenic valves and transfer lines complement their range. The picture shows an Al-fiberglass Dewar, which was made to take an ADR unit made at an INFN section in Italy.(Pub: 27 Aug 2004). For more information contact TECO René Koch.

Micro-manipulated Cryogenic Probe Stations

Lake Shore'wide range of Cryogenic Probe Station from Table Top to Full Wafer Systems allows to configure the probe stations with up to 6 probe arms, in a combination of Strip Line Probes ideally for DC bias or low-frequency transport, low-noise shielded and low-leakage guarded measurements for high frequency measurements to 5 GHz; and Microwave Probes tuned to 40 GHz, 50 GHz or 67 GHz. High and Low Temperature options allow a temperture range from 1.5K to 675K. The photo shows the Model FWP6 which can take up to 4-inch wafers and features: 3.5-inch viewable window with 250 mm vacuum chamber; 125 mm × 52 mm × 16 mm probe travel; ±5° Theta manipulation for multi-pin probes plus Ø51 mm circular area travel; 4.5 K to 475 K temperature range (reads probe and wafer); up to 16:1 zoom CCD camera. Many accessories are available, such as the Pneumatic Vibration Isolation System, or the Vertical or Horizontal Magnetic Field option. For more information contact TECO René Koch, or click here to configure your system on-line. We will be pleased to submit you a quotation accordingly.