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Cryogenics and Measurement

Assembly

Cools a sample to 77 K on a dip probe, or lower in a closed-cycle cryostat, and measures four-probe resistance, AC susceptibility and magnet levitation. A current source and nanovoltmeter carry the resistance measurement, and a lock-in amplifier with a wound coil set carries the susceptibility. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Cryogenics and Measurement parts and their functions

18 top-level parts · 30 parts in total · full bill of materials below
Cryogenics and Measurement parts diagram: 1 liquid nitrogen storage dewar, 2 open benchtop dewar flask, 3 nitrogen dip probe or pour-fill cryostat, 4 closed-cycle cryostat, 5 cryogenic temperature controller, 6 cryogenic temperature sensors, 7 precision current source, 8 nanovoltmeter, 9 lock-in amplifier, 10 AC susceptibility coil set, 11 gaussmeter with hall probe, 12 neodymium magnet, 13 bench digital multimeter, 14 GPIB to USB interface, 15 silver paint, silver epoxy and indium, and 3 more. 30 parts in 18 top-level items.
Cryogenics and Measurement parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.
#PartQtyWhat it does
1 Liquid Nitrogen Storage Dewar 1× Stores liquid nitrogen between deliveries and fills the benchtop flasks. Core
2 Open Benchtop Dewar Flask 2× Holds 1 to 2 L of liquid nitrogen on the bench for dipping the probe and for the levitation check. Core
3 Nitrogen Dip Probe or Pour-Fill Cryostat 1× Carries the sample, its four contacts and a thermometer into the nitrogen bath to record resistance from room temperature to 77 K. Core
4 Closed-Cycle Cryostat 1× Cools the sample below 77 K without liquid helium to measure transitions between about 4 K and 77 K. Useful
5 Cryogenic Temperature Controller 1× Reads the cryogenic sensors and drives the stage heater to hold or ramp temperature during a measurement. Core
6 Cryogenic Temperature Sensors 3× Measures the temperature of the sample stage and of the cold head. Core
7 Precision Current Source 1× Supplies a stable, reversible current through the outer two contacts of the four-probe sample. Core
8 Nanovoltmeter 1× Measures the voltage across the inner two contacts, which falls to the noise floor when the sample superconducts. Core
9 Lock-In Amplifier 1× Reads the pickup-coil voltage for AC susceptibility and measures AC four-probe resistance at low current. Core
10 AC Susceptibility Coil Set 1× Applies a small AC field and senses the sample's susceptibility, which turns diamagnetic at the transition, on two series-opposed pickup coils. Core, set
11 Gaussmeter with Hall Probe 1× Measures the field of the levitation magnets and of the susceptibility coil so that fields reported with a result are known. Useful
12 Neodymium Magnet 10× Shows whether a pellet cooled in liquid nitrogen levitates a small magnet placed over it. Core
13 Bench Digital Multimeter 1× Checks contact resistance and continuity before cooldown and reads a Pt100 thermometer by four-wire resistance. Core
14 GPIB to USB Interface 1× Connects instruments without USB or Ethernet, such as the nanovoltmeter, to the data acquisition computer over GPIB. Core
15 Silver Paint, Silver Epoxy and Indium 1× Makes the four electrical contacts between fine wire and the sample as painted or cured silver joints or pressed indium pads. Core, set
16 Cryogenic Lead Wire and Fine Contact Wire 1× Carries signals down the probe with little heat leak and joins the sample contacts to the stage pads. Core, set
17 Cryogenic Varnish, Grease and Polyimide Tape 1× Anchors leads and sensors with varnish, joins the sample thermally to the stage with grease and insulates pads with tape. Core, set
18 SQUID Magnetometer or PPMS (Facility Access) 1× Measures DC magnetization and shielding fraction, or resistance in fields of several tesla, to confirm a transition seen on the bench. Optional

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Build & assembly graph

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Bill of materials for Cryogenics and Measurement

18 top-level lines · 18 rows shown · 30 parts total · indented to 3 levels
# Item / sub-assembly Part no. Qty/assy Ext. qty Parts Type
1 Liquid Nitrogen Storage Dewar liquid-nitrogen-storage-dewar 1× 1 · part
2 Open Benchtop Dewar Flask open-benchtop-dewar-flask 2× 2 · part
3 Nitrogen Dip Probe or Pour-Fill Cryostat nitrogen-dip-probe-or-pour-fill-cryostat 1× 1 · part
4 Closed-Cycle Cryostat closed-cycle-cryostat 1× 1 · part
5 Cryogenic Temperature Controller cryogenic-temperature-controller 1× 1 · part
6 Cryogenic Temperature Sensors cryogenic-temperature-sensors 3× 3 · part
7 Precision Current Source precision-current-source 1× 1 · part
8 Nanovoltmeter nanovoltmeter 1× 1 · part
9 Lock-In Amplifier lock-in-amplifier 1× 1 · part
10 AC Susceptibility Coil Set ac-susceptibility-coil-set 1× 1 · part
11 Gaussmeter with Hall Probe gaussmeter-with-hall-probe 1× 1 · part
12 Neodymium Magnet neodymium-magnet 10× 10 · part
13 Bench Digital Multimeter bench-digital-multimeter 1× 1 · part
14 GPIB to USB Interface gpib-to-usb-interface 1× 1 · part
15 Silver Paint, Silver Epoxy and Indium silver-paint-silver-epoxy-and-indium 1× 1 · part
16 Cryogenic Lead Wire and Fine Contact Wire cryogenic-lead-wire-and-fine-contact-wire 1× 1 · part
17 Cryogenic Varnish, Grease and Polyimide Tape cryogenic-varnish-grease-and-polyimide-tape 1× 1 · part
18 SQUID Magnetometer or PPMS (Facility Access) squid-magnetometer-or-ppms-facility-access 1× 1 · part

Where the cryogenics and measurement is used

1 product across 1 domain contain it, directly or inside a sub-assembly

Used in 1 assembly

Superconductor Materials Lab

Sourcing: possible vendors

Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $0.50–$100. How estimates work
VendorHQSpecialtyMOQLead time
🇨🇳Foxconn
foxconn.com ↗ 		Shenzhen, CN Electronics contract mfg 1,000 pcs 6–10 wks
🇸🇬Flex (Singapore)
flex.com ↗ 		Singapore Electronics contract mfg 1,000 pcs 6–10 wks
🇮🇳Dixon Technologies
dixoninfo.com ↗ 		Noida, IN Electronics contract mfg 1,000 pcs 6–10 wks
🇨🇳BYD Electronics
bydelectronic.com ↗ 		Shenzhen, CN Electronics contract mfg 1,000 pcs 6–10 wks
🇸🇬Venture Corp
venture.com.sg ↗ 		Singapore Electronics contract mfg 1,000 pcs 6–10 wks