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Active suppression of temperature oscillation from a pulse-tube cryocooler in a cryogen-free cryostat: Part 1. Simulation modeling from thermal response characteristics
- Publication Year :
- 2020
- Publisher :
- arXiv, 2020.
-
Abstract
- A cryogen-free cryostat cooled using a 4 K commercial GM or pulse tube cryocooler (PTC) displays temperature oscillations caused by the intrinsic working principle of the regenerative cryocooler. To dampen such oscillations usually requires either a large heat capacity or a large thermal resistance. To understand this phenomenon better and suppress it more effectively, both the step response characteristic and the intrinsic oscillation characteristic of cryostat have been used to obtain the complete transfer functions of a simulation model. The latter is used to test and optimize traditional PID feedback control. The results showed this approach has almost no effect on the temperature oscillation amplitude. Based on this simulation model, a novel active method was proposed and tested numerically. Simulation results predict the method should suppress the amplitude of the original temperature oscillation by a factor of two.<br />Comment: 16 pages, 10 figures
- Subjects :
- 010302 applied physics
Cryostat
Physics - Instrumentation and Detectors
Materials science
Oscillation
Physics::Instrumentation and Detectors
Thermal resistance
General Physics and Astronomy
PID controller
FOS: Physical sciences
Mechanics
Instrumentation and Detectors (physics.ins-det)
Cryocooler
01 natural sciences
7. Clean energy
Step response
Amplitude
0103 physical sciences
General Materials Science
010306 general physics
Pulse tube refrigerator
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....965b34cc559c4015e5d719400ec7fbaa
- Full Text :
- https://doi.org/10.48550/arxiv.2002.03177