Похожие презентации:
Leak and pressure tests in magnets production chain
1. Leak and pressure tests in magnets production chain
Galimov A.R.JINR-GSI meeting, 2018-12-02
2. Applied helium leak test methods
A) Enclosure test (integral leak detection);B) Spray technique (local leak detection);
С) Enclosure test (integral leak detection);
D) Sniffer technique (local leak detection)
E) Bubble test
Leak detectors:
ASM310
ASM380
HLT575
ASM340
Maximum sensitive:
5×10-13 Пам3/с (5×10-12 mbar•l/с)
3. Enclosure test
IsolatorsTubes
Parts of magnets (sometimes)
Sensitive: 5×10-13 Пам3/с
Summarize leak
4. Sniffer test
ConnectionsMagnets after cryogenic test
Magnets with problems
Sensitive: 5×10-9 Пам3/с
Place of leak;
Leak can be calculated
5. Spray technique
Parts of magnets before cryotestMagnets before cryotest
Another items for vacuum
Sensitive: 5×10-13 Пам3/с
Place of leak;
Leak can be calculated;
6. Enclosure test (main test for magnets)
MagnetsTubes
Another items with helium inside
Sensitive: 5×10-13 Пам3/с
Summarize leak;
7. Test bench for enclosure test
MagnetsTubes
Pressure test is done last leak test
8. Enclosure test under the helium temperature
Theoret ical leak rat es of a t ubular leak of 8 0 nm diamet er and 1 mm longApplying law of Hagen-Poiseuille ( laminar f low, non-compressible f luides) , conservat ive approach
Temperat ure [ K]
1 .0 0 E+0 0
1 .0 0 E+0 1
1 .0 0 E+0 2
1 .0 0 E+0 3
1 .0 0 E-1 1
Gas 1 bar
Liquid 1 bar
3 .6 bar
1 .0 0 E-1 2
Molar flow rat e [ Mol/ s]
Operat ion t emperat ure at
highest operat ion pressure in LHC
1 .0 0 E-1 3
RT leak t est
at 2 5 bar
1 .0 0 E-1 4
1 .0 0 E-1 5
1 .0 0 E-1 6
9.
Enclosure test under the helium temperatureMagnets
Sensitive: 5×10-13 Пам3/с
Temperture;