Oxford Instruments
Desc – Magnetic Cryostat
Model – Spectromag 4000

Used / Sold as is / Untested / Condition unknown / Could be used for parts

Magnet & Cryostat
• Type: Horizontal-field split-pair superconducting magnet
Maximum field strength:
Up to 10 T at 4.2 K (NJIT)
Typical 7–8 T at 2–4 K (Latvia setup variant SM4000 8)

• Field homogeneity: ~0.6–0.8 % over a 10 mm-diameter sphere
• Magnet stability: ≤ 1×10⁻⁴/hr in persistent mode
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Cryogen Consumption and Hold Time
• Helium consumption:
~0.18 L/hr (idle), ~0.95 L/hr (full load)
~0.23 L/hr (idle), ~1.0 L/hr (full load) for SM4000 8

• Helium reservoir: ~20 L, providing >100 hr hold time
• Nitrogen consumption: ~0.5 L/hr with 24 L reservoir (~48 hr hold time)

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Temperature Range & Control
• Variable Temperature Insert (VTI):
Temperature range 1.5–300 K (with pumps)

Stability ± 0.1 K
Sample space diameter ~25 mm
• Cooldown times:
(Note: These times come from the SpectroMagPT, a similar platform — actual may vary slightly)
~40 h to 4 K
~90 min to <2 K after probe insertion

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Optical Access & Sample Handling
• Windows: Four horizontal optical ports (two parallel and two perpendicular), typically Mylar or quartz
• Sample rod:
Hinged, offering ±15 mm axial motion and 360° rotation
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Power & Control Electronics
• Magnet power supply (IPS120 10):
±120 A, ±10 V output
Current settable to 1 mA (front panel), 0.1 mA (computer)
Stability ±3 mA/°C
RS 232 & IEEE interfaces, includes switch heater and persistent-mode control
Auto-rundown facility

Temperature controller: Typically TC503 digital (or similar instrument-controller combo)
It creates an environment where you can study the electronic, magnetic, and optical properties of materials under extreme conditions:
• High magnetic fields (up to ~10 Tesla)
• Very low temperatures (down to ~1.5 K)
• Controlled sample orientation and optical access