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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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slide1

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 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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