R. Ostojic

CERN, AT Department

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LHC Insertions

Experimental insertions in points1, 2, 5, 8 contain low-beta triplets.

In total, eight triplets are installed.

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The LHC low- triplet

MQXA MQXB MQXAMQXB

6.37 5.5 5.5 6.37

MCBXA MCBXMQSX

TASB

MCBX

Q3 Q2 Q1

MCSOX

DFBXLBX

D1

IR 1 and 5, D1 is a normalconducting dipole.

DFBX

Triplets were designed and built bya collaboration of five laboratories:BNL, CERN, Fermilab, KEK, LBNL.

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Design and manufacture

• Magnets– MQXA (Q1, Q3) KEK– MQXB (Q2) Fermilab– Correctors CERN– MBX (D1) BNL

• Cryostats– Q1, Q2, Q3 Fermilab– D1 BNL

• DFBX LBNL, Fermilab

• InterconnectsDesign– Q1-Q2, Q2-Q3, Q3-DFBX Fermilab– D1-DFBX BNL, FermilabExecution CERN

• Jacks and tunnel installation CERN

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Design specifications and documents

• All design specifications and solutions are documented in the functional and interface specifications. These documents were released following collaboration meetings and independent reviews, and after a formal review procedure in the CERN EDMS.(EDMS documents: LHC-LQX-ES%, LHC-DFBX-ES%, LHC-MBX-ES%).

• Acceptance procedures for all magnets and DFBX are defined in appropriate Acceptance Plans, also formally reviewed in CERN EDMS.(EDMS documents: LHC-LQX-TP%, LHC-DFBX-ES-0001, LHC-MBX-ES-0003).

• Safety related procedures and documents were reviewed by competent bodies in participating laboratories following the Memoranda of Understanding.(http://sc-gs.web.cern.ch/sc-gs/gs_ms/TISUS/)

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Key dates

• Design and development 1998-2002

• Production 2001-05

• Delivery at CERN 2003-07

• First triplet assembly at CERNApril 2005

• First triplet in tunnel (8L) Dec 2005

• Triplet in 8L under vacuum June 2006

• Pressure test of Sector 7-8 (8L) Nov 2006

• Repair of HX in all triplets Feb-May 2007

• Pressure test of triplet in 5L Mar 2007

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Schematics of the mechanical design

MQXA MQXB MQXAMQXB

Q3 Q2A Q1

DFBX

Q2B

38490

MQXBLBX

D1

External heat exchanger (HX)

Fixed Point HX-Cold Mass

FP Cold Mass-Vacuum Vessel

Fixed Point Triplet-Tunnel Floor

Tie Rods Linking Vacuum Vessels

Jacks (longitudinal)

Internal heat exchanger

For details see dwg. LHCLSX__0001 and LHCLSX__0003.

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LHC low- triplet – Q2

External heat exchangerGRP spider

MQXB quadrupoles

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LHC low- triplet – Q1

MQXA quadrupole

End domes and cryo-piping assembled by Fermilab

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LHC low- triplet – D1

MBX = RHIC dipole

Internal heat exchanger

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LHC low- triplet – DFBX

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LHC low- triplet – warm assembly

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Q1 - Q2 interconnect

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Q1 - Q2 interconnect

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Q1 - Q2 interconnect closure

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Q2 - Q3 interconnects – TAS B

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Q3 - DFBX

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DFBX - D1

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DFBX - D1