Resonant cryogenic chopper

Lyman A. Page; Edward S. Cheng; Stephan S. Meyer

doi:10.1364/AO.31.000095

Applied Optics
Vol. 31,
Issue 1,
pp. 95-100
(1992)
•https://doi.org/10.1364/AO.31.000095

Resonant cryogenic chopper

Lyman A. Page, Edward S. Cheng, and Stephan S. Meyer

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Lyman A. Page, Edward S. Cheng, and Stephan S. Meyer, "Resonant cryogenic chopper," Appl. Opt. 31, 95-100 (1992)

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Abstract

We describe the design, construction, and performance of a resonant cryogenic chopper that operates at 4.2 K. The chopper is mechanically and thermally robust; it can occult a 2.54-cm aperture at 4.5 Hz while dissipating ~1 mW. Both the stator and rotor magnetic fields are controllable to allow for performance optimization and to help in measuring any possible interference effects. Data on long-term amplitude stability are presented.

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Construction
G_{300 K} = 8.3 × 10¹¹ dyn/cm²		I _R = 110 g cm²
ν_res = 4.47 Hz with d = 0.046 cm		l = 20 cm
ν_res = 8.8 Hz with d = 0.064 cm		l = 20 cm
A _R = 2.5 cm²
Blade	Diameter = 10.16 cm	Thickness = 0.064 cm
		Gold coating ≈ 2000 Å
Windings	Supercon T48B fine wire
	Core diameter = 0.051 mm, core + copper = 0.0813 mm
	Net diameter (wire + insulation) = 0.107 mm
	T_crit = 10 K	B_crit = 100 kG
	N _R = 180	R_{300 K} = 45 Ω
	N_sta = 3000	R_{300 K} = 955 Ω
Cryoperm 10	B_sat = 9000 G	μ_{4.2 K} = 60,000
		Thickness/laminant = 0.1 mm
Operation
ν_{res at 4.2 K} = 4.474 Hz	ν_chop = 4.466 Hz
i _s = 250 mA	B _S = 1000 G
i(t) = 9.3 cos(2πν_chop t) mA	Amplitude = 35 deg

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Applied Optics