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| For information on any of the following accessories, check the box and submit to us for a more detailed description and quote. |
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| Model ZN50 Probes (50 Ohm Stripline probes) & Related Cables |
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 These probes have an SMA connector mounted directly to an alumina ceramic blade with a 50-Ohm Stripline routed to the probe contact. The ZN50 probe base also incorporates a pair of copper braids
that connect to the sample stage to cool/heat the probe to the sample temperature. They feature an easily replaceable alumina blade assembly, with SMA connector and tip. (see ZNR-50) The most commonly used probe is the ZN50-25-BeCu. Three available tip radii are ideal for: contacting pads and large features (25 µm tip); contacting small features (10 µm tip); and contacting very small features
(3 µm tip). Tungsten tips are recommended for aluminum pads. BeCu tips are recommended for all others. Other tips, such as Paliney 7 or gold plated BeCu, are also available. The material and tip radius (in µm) are incorporated into the part number. The standard probes work at frequencies to 2 GHz. The ZN50-25-HF-BeCu probe has an increased bandwidth of 5 GHz. Select your initial probes below, (4 probes required), and order other material types and spares from the ZN50R blade assemblies listed as spare or replacements later in this section.
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| Please indicate the quantity of each probe to be added. |
ZN50-03-W
ZN50-10-W
ZN50-25-W |
ZN50-10-BeCu
ZN50-25-BeCu
ZN50-25-HF-BeCu |
ZN50-25-P7 |
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| Spare or replacement units, order as above, inserting an R after the ZN50, and specifying the radius and tip material as follows in example. I.e. a ZN50-25-BeCu replacement blade would be a ZN50R-25-BeCu. |
ZN50R-03-W
ZN50R-10-BeCu
ZN50R-10-W
ZN50R-25-BeCu
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ZN50R-25-P7
ZN50R-25-W
ZN50R-25-HF-BeCu |
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| Z50 Cables (Priced per probe arm) |
| Choose the cable configuration for your application. |
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Probe cable, type Cu-SS-36/50 Ultra miniature cryogenic coaxial cable with SMA plug at probe end, and BNC feedthrough. The shield is grounded. (Shielded measurements to 50 MHz, 475 K.) |
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Probe cable, type Cu-SS-36/50 Ultra miniature cryogenic coaxial cable with SMA connector at probe end to 3-lug triax feedthrough. (For low-leakage guarded measurements to 50 MHz, 475 K.) |
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Probe cable, .085 stainless semi-rigid microwave coaxial cable with SMA plug at probe end and SMA jack at feed through end. (For measurements to 3 GHz, 425 K.) |
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| Specifications for Cryogenics Coax Cable |
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| Model GSG Probes (Coplanar waveguide probes) & Related Cables |
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 These probes are made to Desert Cryogenics specifications by GGB Industries. They have optimized, low-thermal-conductivity coax leading to low-thermal-conductivity tips, which minimize the thermal impact of the probe. The contacts geometry is ground-signal-ground (GSG), with pitch (spacing), which is user-specified, usually 100 µm or 150 µm. The probe is specially manufactured to Desert Cryogenics proprietary design, with a copper braid assembly to cool the probe to near sample temperature. The contacts are held in fixed and precise positions by epoxy encapsulation, and the center pin position is known to be stable on repeated thermal cycling. The probes are available in three bandwidths: 0-40 GHz probes have K-connectors; 0-50 GHz have 2.4 mm connectors; and 0-67 GHz probes have 1.8 mm connectors. The model number for a probe is GSG-xxx-yy, where xxx is the pitch in microns and yy is the bandwidth in GHz. For example a 50 GHz bandwidth probe with 150-µm pitch is a GSG-150-50. GSG probes are geometrically interchangeable with Z50 probes. Microwave probes are limited to 400 K. |
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Model GSG-xxx-40 microwave probe, each
Model GSG-xxx-50 microwave probe, each
Model GSG-xxx-67 microwave probe, each
xxx = 50, 100 or 150 µm. |
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| GSG Cables (Priced per probe arm) |
| These cables are cryogenically stabilized before assembly. The cables also include a compression-seal vacuum feed through which is a lossless feed through. The low-loss cables have higher thermal losses but lower microwave losses. The cable is semi rigid, with stainless steel outer jacket, silver plated BeCu inner conductor and Teflon dielectric. The low-loss cable has a copper film outside the dielectric. |
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Model K-085-K |
(40 GHz bandwidth, 400 K) |
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Model K-085LL-L |
(40 GHz bandwidth, low loss, 400 K) |
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Model 2.4-085-2.4 |
(50 GHz bandwidth, 400 K) |
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Model 2.4-085LL-2.4 |
(50 GHz bandwidth, low loss, 400 K) |
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Model 1.8-085-1.85 |
(67 GHz bandwidth, 400 K) |
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Model 1.8-085LL-1.85 |
(67 GHz bandwidth, low loss, 400 K) |
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| Sample Holders |
Each Base system includes one TT-CS-G sample holder. Additional sample holders can be ordered configured as listed.
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| *Manufactured with low contraction material for larger diameter samples. |
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Triaxial feedthrough and coaxial cable installed and wired. (Only one required for these sample holders.) |
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| Options |
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Radiation shield heater, thermometer, wiring, and cable modifications. |
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Power supply for above, to amplify the controller analog output and drive the 100W shield heater. Includes power cable and cable between the LakeShore controller and power supply. (Requires shield heater/thermometer option above.) |
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Nitrogen Dewar with stainless fittings, gauges, and adapters, to allow LN2 use with Helium transfer line. |
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Pump-line vibration isolator
Pump-line vibration isolator, with NW-25 fittings, 1 meter stainless steel bellows, clamps, and rings, placed between pump cart and system (1 bag cement required). |
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| Cryogenics Coax Cable |
| Type Cu-SS-36/50 Ultraminiature cryogenic coaxial cable was developed specifically to meet the ever-more-demanding needs of the cryogenic community. |
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| The electrical performance of a coaxial cable is determined by its impedance, capacitance, dc resistance, and rf attenuation losses. The DC resistance and attenuation losses are determined dominantly by the size of the cable and by the properties of the center conductor. Type Cu-SS-36/50 is a True 50 ohm cable with a low 94 pF/m capacitance, and has a copper center conductor for Low DC Resistance and Low rf Losses. |
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| The thermal conduction is dominated by the properties of the shield. In type Cu-SS-36/50, the shield is braided stainless steel, and the result is a Very Low Heat Leak. No other cable combines the outstanding electrical properties of copper ultra-miniature coaxial cables with the low thermal losses of stainless steel cables. This coax is available only from Desert Cryogenics- even the outer jacket is Desert beige. |
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| Physical properties |
| Center conductor: 36 Ga (.12 mm) Stranded Copper |
| Dielectric: Teflon FEP |
| Shield: Braided stainless steel |
| Jacket: Teflon FEP |
| Overall diameter: 0.036" (.91 mm) |
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| Low frequency electrical properties |
| Center conductor resistance: 1.4 ohm/m at 25 °C |
| Shield resistance: 4 ohm/m at 25 °C |
| Capacitance: 94 pF/m |
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| Heat Leak Coefficients |
| To calculate a heat leak in mW, divide the heat leak coefficient by the length of the cable separating the end temperatures. |
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300 K to 77 K: 1.8 mW-m |
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300 K to 10 K: 2.7 mW-m |
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300 K to 4.2 K: 2.7 mW-m |
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77K to 4.2 K: 1.0 mW-m |
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77K to 10 K: 1.0 mW-m |
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10K to 4.2 K: 0.05 mW-m |
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| Wiring and feedthroughs |
- Color-coded twisted pairs on feedthroughs from 4 to 32 pins
- Polyimide insulated wires and pairs available for high-temp applications
- Ultra-mini cryogenic coax, shielded cable, and shielded twin-ax available with BNC, SMA, and Triax (2- and 3-lug) feedthroughs
- Optical fibers and microwave coax and feedthroughs available
- Capillaries with feedthroughs available
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| Cryogenic accessories available |
- Thermometry, temperature controllers, cables
- Spare parts and wiring, cryogenic solders, indium and lead gasket wire
- Thermal anchor strips
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Special Request
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| Terms |
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- FOB: Tucson, AZ. USA
- Deliveries will be quoted on an ARO basis
- Warranty: One year parts and labor.
- All pricing and specifications are subject to change at the discretion of the seller.
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| Please check any of the specifications above for quotation or a detailed description by filling out the contact information and clicking on the 'Submit' button below. |
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