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wiki:bolts_nuts [2022/01/28 16:12] henri.godfrin@neel.cnrs.fr |
wiki:bolts_nuts [2022/01/30 18:36] (current) henri.godfrin@neel.cnrs.fr |
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==== Glues==== | ==== Glues==== | ||
* Stycast® 1266 or " | * Stycast® 1266 or " | ||
+ | |||
* Stycast® 2850 FT or "black stycast" | * Stycast® 2850 FT or "black stycast" | ||
{{ wiki: | {{ wiki: | ||
{{ wiki: plastic_parts.jpg? | {{ wiki: plastic_parts.jpg? | ||
- | * Araldite® is an epoxy, 2-component glue. Used to glue plastic parts (cells, rods, etc). Can be used to cast rods used to make plastic parts for dilution refrigerators (mixing chambers, plugs, etc). Source: CRTBT-CNRS cryogenics lab. An example of a plastic mixing chamber (G. Frossati, Grenoble 1977) | + | * Araldite® is an epoxy, 2-component glue. Used to glue plastic parts (cells, rods, etc). Can be used to cast rods used to make plastic parts for dilution refrigerators (mixing chambers, plugs, etc). Source: CRTBT-CNRS cryogenics lab. An example of a plastic mixing chamber (G. Frossati, Grenoble 1977) made out of Araldite is shown in the picture. |
* UV-curing glues: used by dentists, these glues can be a good solution to glue rapidly wires and other delicate parts. Used in Grenoble in the 80's. Source: H. Godfrin | * UV-curing glues: used by dentists, these glues can be a good solution to glue rapidly wires and other delicate parts. Used in Grenoble in the 80's. Source: H. Godfrin | ||
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* Micropore 3M Tape®: Electrical wires must be attached to different parts of the cryostat in order to limit vibrations and noise. Masking tape has been traditionally used, but it tends to become dry, rigid, brittle, and hard to remove. I started using in the 80's the so-called " | * Micropore 3M Tape®: Electrical wires must be attached to different parts of the cryostat in order to limit vibrations and noise. Masking tape has been traditionally used, but it tends to become dry, rigid, brittle, and hard to remove. I started using in the 80's the so-called " | ||
- | ==== Radiation shields | + | ==== Plastic cells, mixing chambers, Plugs ==== |
+ | {{ wiki: | ||
+ | Plastic cells and mixing chambers are commonly found in low temperature refrigerators, | ||
- | A common problem in home-made refrigerators is insufficient shielding in pumping lines. | + | * J. Wheatley and A.C. Mota designed dismountable plastic (Epibond 100A) and metallic plugs sealed with a mixture of soap and glycerin: A Convenient and Reliable Demountable Seal for Low Temperature Work, A. C. Mota, Review of Scientific Instruments 42, 1541 (1971). https:// |
- | A simple design for removable radiation shields is shown in the picture. | + | |
+ | * **Conical plugs** in Araldite cells, sealed with Apiezon N vacuum grease, have been designed and extensively used by Frossati. In small sizes (about 1 to 2 cm, the conical plugs withstand pressures differences of about 40 bar. Diameters of 4 to 6 cm have been used at low pressures (mixing chambers). Both parts of the cone (plug and seat) have to be machined using the same angle, essentially made at the same time. | ||
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+ | * **Flat Araldite plugs**: for low pressure applications (<2 bars pressure difference), | ||
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+ | ==== Radiation shields ==== | ||
+ | {{ wiki: | ||