Leak and pressure tests in magnets production chain
Applied helium leak test methods
Enclosure test
Sniffer test
Spray technique
Enclosure test (main test for magnets)
Test bench for enclosure test
Enclosure test under the helium temperature
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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

Isolators
Tubes
Parts of magnets (sometimes)
Sensitive: 5×10-13 Пам3/с
Summarize leak

4. Sniffer test

Connections
Magnets 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 cryotest
Magnets 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)

Magnets
Tubes
Another items with helium inside
Sensitive: 5×10-13 Пам3/с
Summarize leak;

7. Test bench for enclosure test

Magnets
Tubes
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 long
Applying 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 temperature
Magnets
Sensitive: 5×10-13 Пам3/с
Temperture;

10.

Bubble test
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