AB-LTC Technical Review

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AB-LTC Technical Review
Extraction Protection Elements, TCDS, TCDQ. Wim
Weterings Contributions from Brennan
Goddard Marta Sans Merce Benoit Riffaud Marcel Gyr
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Outline
Introduction TCDS TCDQ Concept Technical
Solutions Planning Status Conclusion
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Introduction
TCDS Fixed diluter block to protect the MSD
Septa in the event of an asynchronous firing of
the MKD kickers.
TCDQ - Mobile diluter block to protect Q4
magnets in the event of an asynchronous firing of
MKD kickers.- Protects the arc at 450GeV and the
triplet apertures at 7TeV from small impact
parameters bunches.
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(Some) Design Parameters

• TCDS - Dilute about 6.1 MJ of energy, 1.7 of
  the energy contained in the LHC beam at 7 TeV.
• TCDS - Max. 300C in MSD vacuum chamber and max.
  100C in the MSD Yoke.
• TCDS - Aperture for circulating beam (n1 6.5)
• TCDQ - Max. energy deposition in Q4 of 100 J/g.
• TCDQ movement 15 mm (10s at 7 TeV and 450 GeV)
  with precision of 0.25mm (0.5 s at 7 TeV).
• Nominal vacuum pressure of lt10-8 Pa.
• Assure a low transverse machine impedance.
• Limit radiation exposure of personnel.

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TCDS Concept
Functional Specification LHC-TCDS-ES-0001 (EDMS
393973)
0.5m Ti 4.5 g/cm3
1m AlN 3.31g/cm3
1.5m Graphite 1.77 g/cm3
2m Carbon Composite 1.4 g/cm3
1m Graphite 1.77 g/cm3
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TCDS Technical Solution
MSD

• Two 3 meter long vacuum tanks Ø250mm.
• Two sublimators and two 400 l/s ion pumps/tank.
• 500 mm for interconnection.
• Independent supports with 3 point alignment.

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TCDS Technical Solution
Absorber Blocks
CirculatingBeam
ExtractedBeam
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TCDS Planning
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TCDQ Concept
Functional Specification LHC-TCDQ-ES-0001 (EDMS
01/2004)

• Initial MARS simulations resulted in a 10m C 1m
  Fe structure. (N. Mokov et al., Fermilab,
  FN-0724)
• Iterations in FLUKA are ongoing with Q4
  implemented in geometry. (M. Sans Merce AB/ATB)
• Preliminary results favour a TCDS-Type, but
  longer, structure.

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TCDQ Technical Solution
Absorber Block
TCDQ
TCDS
Motorisationsystem
CirculatingBeam
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TCDQ Planning
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Status Conclusion

• TCDS Functional Specification approved, TCDQ
  Functional Specification to be approved 01/2004.
• One full time designer is working on the project,
  with an additional designer starting 01/2004.
• Assembly and construction options (in-house vs
  outsourced) presently being studied in the light
  of group reçourses and priorities.
• Advancement is still according to work unit
  planning, TCDQ schedule tight but still feasible
  (no room for delays).

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Status Conclusion

• No problems anticipated for the CtC.
• No problems anticipated to reach the design
  parameters.
• EDMS / Hardware baseline documentation minor, but
  present.
• Integration studies in collaboration with ICL
  have started.
• Installation issues have not yet been looked at.