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WENDELSTEIN 7-X Assembly. Max-Planck-Institut für Plasmaphysik. Presentation to NSCX. KKS-Nr.: 1-AD. Dok-Kennz.: -Txxxx.0. October 2007. Heinz Grote. Vacuum Systems at Wendelstein 7-X and Leak Testing during Assembly Insulating vacuum in the cryostat

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WENDELSTEIN 7-X Assembly

Max-Planck-Institut für Plasmaphysik

Presentation to NSCX

KKS-Nr.:

1-AD

Dok-Kennz.:

-Txxxx.0

October 2007

Heinz Grote

Vacuum Systems at Wendelstein 7-X and Leak Testing during Assembly

Insulating vacuum in the cryostat

Ultra-high-vacuum in the plasma vessel

Interspace Vacuum system for multilayer bellows, double sealings, control coils, el. feedthroughs

Evacuation of the gas inlet into the plasma vessel – already working

Insulating vacuum in cryostats of the gyrotrons ECRH – already working

Vacuum system for pellet injection

Vacuum system and gas inlet NBI

Insulating vacuum ICRH

Vacuum systems for diagnostics (many)

Vacuum system for the cooling machine

...

Heinz Grote


Max planck institut f r plasmaphysik euratom association

Leak testing Strategy

Max-Planck-Institut für Plasmaphysik, EURATOM Association

  • All components to be assembled are leak tested with Helium or SF6

  • before delivery (qualification of the workshops varies)

  • during incoming inspection

  • after re-work

  • on the assembly stands immediately after welding or mounting of the sealings

  • finally in an integral leak test after closing the cryostat and the plasma vessel

  • Where ever possible pressure gradients during testing are equal as in working condition

  • Where ever possible tubes and weldings of cryogenic parts are tested at temperature of LN2

Heinz Grote


Max planck institut f r plasmaphysik euratom association1

Leak testing Equipment (1)

Max-Planck-Institut für Plasmaphysik, EURATOM Association

All large components are leak tested with Helium in a vacuum tank

Volume: 55 m³

inner diameter: 4.900 mm

max. inner height : 3.150 mm

max. height of load (crane height): 2.600 mm

max. weight of load: 7.500 kg

base pressure

(< 2*10-7 mbar empty tank)

(< 3*10-5 mbar loaded with W7-X coil)

double–O–ring seal [Viton]

with interspace pumping

26 CF-ports various size

pumps: 4 x 65m³/h rotary vane pumps,

2 x 1.000m³/h roots-pumps

2 x cold traps

2 x 1.000 l/s turbomolecular pumps,

used for W7-X coil Paschen tests,

He-leak tests of superconductors and He-cooling tubes on coils, support structure etc.

Heinz Grote


Max planck institut f r plasmaphysik euratom association2

Leak testing Equipment (2)

Max-Planck-Institut für Plasmaphysik, EURATOM Association

All joints and weldings are leak tested locally with special designed chambers or flexible bags

Variety of silicone sealed leak detection chambers made of stainless steel

Heinz Grote


Max planck institut f r plasmaphysik euratom association3

Leak testing Equipment (3)

Max-Planck-Institut für Plasmaphysik, EURATOM Association

Leak detection chamber

made of Al

sealed with Tacky Tape

Heinz Grote


Max planck institut f r plasmaphysik euratom association4

Leak testing Equipment (4)

Max-Planck-Institut für Plasmaphysik, EURATOM Association

Leak detection chamber made of

stainless steel foil sealed with

Tacky Tape

Heinz Grote


Max planck institut f r plasmaphysik euratom association5

Leak testing at 77 K

Data logger

He- service pipe

Temperature sensor

Silicone sealed stainless

steel chamber for assuring

100 % He-atmosphere

during leak testing

Leak testing Equipment (5)

Max-Planck-Institut für Plasmaphysik, EURATOM Association

Heinz Grote


Max planck institut f r plasmaphysik euratom association6

Mechanical Pumping System - Cryostat Requirements during pump down

Max-Planck-Institut für Plasmaphysik, EURATOM Association

  • Requirements during pump down from atmospheric pressure

    • Evacuation down to 1 mbar 24 hours

    • Evacuation down to 1*10-2 mbar 72 hours

      • (from 1 down to 1*10-2 mbar in 48 hours)

  • Cooling down p < 1*10-2 mbar

  • Outgassing rate of the insulation 1*10-5 mbar*l/(s*m²)

    • Load of the insulation

    • with water vapor 0.25 g/m²

    • Amount of the insulation 30 layers á 1,400 m² (conservative assumption)

  • Heinz Grote


    Max planck institut f r plasmaphysik euratom association7

    Mechanical Pumping System - Cryostat Working requirements, Geometry

    Max-Planck-Institut für Plasmaphysik, EURATOM Association

    • Working Requirements

      • Max. partial pressure (He) 1*10-5 mbar

      • Max. tolerable leak (He) 1*10-2 mbar*l/s Seff >= 1,000 l/s (inside the cryostat)

  • 1,000 l/s in the cryostat 2,000 l/s at the port3,180 l/s

  • Geometry

  • Ports for pumping 3 per module (= 15 overall),

  • diameter 500 mm each

    • Volume approx. 500 m³

  • Heinz Grote


    Max planck institut f r plasmaphysik euratom association8

    Mechanical Pumping System - Cryostat Layout

    Max-Planck-Institut für Plasmaphysik, EURATOM Association

    Pumping set on each of the 5 modules

    Gate valve DN 320 ISO F

    Tube DN 320, length 4 m

    Bypass DN 100

    TMP 2,000 l/s

    Rotary vane pump 65 m³/h

    Roots pump 250 m³/h )

    ) on 2 modules only

    Rotary vane pump 65 m³/h )

    Heinz Grote


    Max planck institut f r plasmaphysik euratom association9

    Mechanical Pumping System - Cryostat Present status

    Max-Planck-Institut für Plasmaphysik, EURATOM Association

    Uwe Schultz

    Heinz Grote


    Max planck institut f r plasmaphysik euratom association10

    Pumping System for Plasma Vessel

    Max-Planck-Institut für Plasmaphysik, EURATOM Association

    - Base pressure, UHV-conditions, 10-8 mbar Turbomolecular pumps (TMP)

    - Experimental, 10-5 - 10-4 mbar Hydrogen (Deuterium, Helium)

    up to 10-3 mbar in the Divertor

    high gas load Cryopumps,

    TMP + Roots + Rotary-pumps

    (3-stage mechanical pump system)

    - Regeneration of Cryopumps with TMP

    - Pumping through divertor gap: Cryopumps behind the target modules

    TMP: 10 individual systems

    1 in each divertor unit

    at the ports AEH and AEP

    Heinz Grote


    Max planck institut f r plasmaphysik euratom association11

    Pumping System for Plasma Vessel Requirements for the Pumping System

    Max-Planck-Institut für Plasmaphysik, EURATOM Association

    Experiment: 3*1021 s-1 1.5*1021 molecules*s-1 ~ 50 mbar*l/s

    Pressure in Divertor: < 5*10-4 mbar Pumping speed: > 100*103 l/s

    cryo pumps: 75*103 l/s for H2

    TMP: 25*103 l/s for H2

    Pump down: ca. 1,300 m² inner surface, (1,000 m² stainless steel, 300 m² carbon, B4C)

    outgassing: 1*10-7 mbar*l/(s*m²) (SS), 1*10-6 mbar*l/(s*m²) (C, B4C),

    total: 4*10-4 mbar*l/s

    base pressure : < 1*10-8 mbar Pumping speed: > 40*103 l/s TMP only

    Heinz Grote


    Max planck institut f r plasmaphysik euratom association12

    Pumping System for Plasma Vessel Mechanical pumping system – Layout of 1 unit

    Max-Planck-Institut für Plasmaphysik, EURATOM Association

    Port AEH Port AEP

    Pumping gap  2,430 l/s

     2,870 l/s

    node:  3,200 l/s

    2*1,850 l/s = 3,700 l/s

    Pumping gap  1,340 l/s

     1,460 l/s

    1,850 l/s

     25*10³ l/s

    at the ports AEH alone

    necessary for operation

    in the standard case, where

    the interaction zone of the plasma

    with the divertor targets is located

    near this port

    Total approx.: 37.7*10³ l/s

    Heinz Grote


    Max planck institut f r plasmaphysik euratom association13

    Pumping System for Plasma Vessel

    Location of the Ports

    Pumping ports

    Max-Planck-Institut für Plasmaphysik, EURATOM Association

    AEH

    AEP

    AEP

    AEH

    Pumping ports

    Heinz Grote


    Max planck institut f r plasmaphysik euratom association14

    Pumping System for Interspace Vacuum Present status

    Max-Planck-Institut für Plasmaphysik, EURATOM Association

    38 rectangular and oval ports with multilayer bellows (Plasma Vessel) 1 – 100 mbar

    to be vented only if both the cryostat and the plasma vessel are vented

    40 rectangular and oval ports with double sealings (Plasma Vessel) ~ 0.1 – 1 mbar

    to be vented together with the plasma vessel

    146 cryostat ports with double sealings ~ 0.1 – 1 mbar

    to be vented together with the cryostat

    3 independent roughing vacuum systems – fivefold each according to W7-X modules

    (dry roughing pump, valve, measuring gauge, tubes to ports DN12-20)

    10 control coils will have interspace vacuum to protect the plasma vessel from water leaks

    14 electrical feedthroughs – not permanently pumped

    Heinz Grote


    Max planck institut f r plasmaphysik euratom association15

    Control Schematic for Pumping System W7-Xbased on SIMATIC S7-400

    Max-Planck-Institut für Plasmaphysik, EURATOM Association

    central main control

    W7-X

    master programmable logic controllers

    part components W7-X

    Olaf Volzke

    Heinz Grote


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