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CCR Mössbauer cryostat specifications

	CCS-800-205
Cooling type	CCR
Temperature range	<5 K to 300 K¹
Typical temperature stability²	±50 mK
Sample environment	Exchange gas
Optical	✔
Sample chamber inner diameter	38 mm (1.5 in)
Rotatable sample	✔
Cooldown	2.5 h
Cold head location	Bottom
Typical vibrational line broadening	0.01 mm/s
Height (approximate)	142 to 168 cm (56 to 66 in)
Weight (approximate)	27.2 kg (60 lb) cryostat and 327 kg (720 lb) stand (including lead shielding)
Window block size	57.2 mm (2.25 in) OD

¹Sample tube must be evacuated at temperatures above 150 K
²Measured with temperature controller

Facility requirements

Water-cooled

CCS-	Cold head	Recommended compressor maintenance interval	Recommended cold head maintenance interval	60 Hz power requirements	50 Hz power requirements	Cooling water requirements	Compressor size
800	-205	30,000 h	10,000 h	200 VAC, 3-phase, 4.6 to 5.6 kW or 460 to 480 VAC, 3-phase, 4.6 to 5.6 kW	200 VAC, 3-phase, 3.6 to 4.8 kW or 380/400/415 VAC, 3-phase, 3.6 to 4.8 kW	4 to 9 L/min at 5 to 25 °C	442 mm × 493 mm × 532 mm high; 96 kg

Air-cooled

CCS-	Cold head	Recommended compressor maintenance interval	Recommended cold head maintenance interval	60 Hz power requirements	50 Hz power requirements	Cooling air requirements	Compressor size
800	-205	30,000 h	10,000 h	200 VAC, 3-phase, 4.6 to 6.4 kW or 460 to 480 VAC, 3-phase, 4.6 to 6.4 kW	200 VAC, 3-phase, 3.6 to 5.4 kW or 380/400/415 VAC, 3-phase, 3.6 to 5.4 kW	17.6 m³/min (60 Hz) or 14.7 m³/min (50 Hz)	442 mm × 493 mm × 889 mm high; 110 kg

CCS-850 mossbauer spectra chart Shown to the right are Fe₅₇ Mössbauer spectra (dots) of a 25 µm iron metal foil at 298 K with the CCR off and on. The velocity scan of ±2 mm/s covers only the innermost lines of the iron metal sextet. Also shown are least squares fits (lines) of a symmetric quadrupole pair with Lorentzian line shapes to each spectrum. The results of the fits were linewidth estimates of 0.234 mm/s with the CCR off and 0.241 mm/s with the CCR on. The uncertainty in the line width estimates due to the counting statistics is ±0.002 mm/s.

NOTE: Data provided by Science Engineering & Education Co. (SEE Co. — formerly Web Research Co.), http://www.seeco.us. Special thanks to Professor Darby Dyar, Mount Holyoke College.