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Pulse tube refrigeration or cooling systems are described which utilize a secondary regenerator or a secondary pulse tube. Use of such a secondary regenerator or pulse tube enables a commercially available pressure oscillator to be incorporated in the cooling system. The commercially available oscil

Pulse tube refrigeration or cooling systems are described which utilize a secondary regenerator or a secondary pulse tube. Use of such a secondary regenerator or pulse tube enables a commercially available pressure oscillator to be incorporated in the cooling system. The commercially available oscillator can be operated at room temperature or approximately so.

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1. A pulse tube refrigeration system comprising: a compressor;a regenerator in fluid communication with the compressor;a pulse tube defining a cold end and a warm end, the regenerator being in fluid communication with the cold end of the pulse tube; anda secondary component selected from (i) a secon

1. A pulse tube refrigeration system comprising: a compressor;a regenerator in fluid communication with the compressor;a pulse tube defining a cold end and a warm end, the regenerator being in fluid communication with the cold end of the pulse tube; anda secondary component selected from (i) a secondary regenerator and (ii) a secondary pulse tube, wherein the secondary component is in fluid communication with the warm end of the pulse tube; andan expander in fluid communication with the secondary component;wherein the regenerator is disposed directly between the compressor and the cold end of the pulse tube, and the secondary component is disposed directly between the expander and the warm end of the pulse tube. 2. The pulse tube system of claim 1 wherein the secondary component is a secondary regenerator. 3. The pulse tube system of claim 1 wherein the secondary component is a secondary pulse tube. 4. The pulse tube system of claim 1 wherein the expander is a pressure oscillator. 5. The pulse tube system of claim 1 wherein the expander is at ambient temperature. 6. The pulse tube system of claim 1 wherein the warm end of the pulse tube is at 30 K. 7. The pulse tube system of claim 1 further comprising a working fluid in communication with the compressor, the regenerator, the pulse tube, the secondary component, and the expander. 8. The pulse tube system of claim 7 wherein the working fluid is selected from the group consisting of 3He and 4He. 9. The pulse tube system of claim 1 wherein the cold end of the pulse tube is at 4 K.