Status Report on the LHC machine Lyndon Evans

Transcription

1 Status Report on the LHC machine Lyndon Evans Third International Symposium on LHC Physics and Detectors Chia, Sardinia, 25th October 2001

2 Contents Injectors Magnets Cryogenics Vacuum Accelerating system Civil engineering Schedule

3 Injectors p/lhc bunch ε* rms < 3 µm at PS ejection (25 GeV) 72 bunches, 25 ns spacing bunch length < 4ns Bunch splitting in the PS

4 Injectors Normalized emittance ε rms (hor, ver) below 3 µm limit at PS ejection (25 GeV) H54 H64 V75 V PSB PS Inj ms Emittance through accelerator cycle PS Inj2 10 ms PS Inj2 + 5 ms PS Ej 6 ms TT Tim e [m s]

5 Injectors bunch length < 4 ns

6 Magnets Name Quantity Purpose MB 1232 Main dipoles MQ 400 Main lattice quadrupoles MSCB 376 Combined chromaticity/ closed orbit correctors MCS 2464 Dipole spool sextupole for persistent currents at injection MCDO 1232 Dipole spool octupole/decapole for persistent currents MO 336 Landau octupole for instability control MQT 256 Trim quad for lattice correction MCB 266 Orbit correction dipoles MQM 100 Dispersion suppressor quadrupoles MQY 20 Enlarged aperture quadrupoles

7 Magnets

8 Injectors

9 Series dipoles Magnetic Field at Quench B [Tesla] Training Quenches at 1.8K - first runs A. Siemko/LHC-MTA HCMBB-A HCMBB-A Quench Number HCMBB-A Training Quench No Quench Provoked Quench HCMBB-A HCMBB-A T1 HCMBB-A T1 HCMBB-A T1 HCMBB-A T1 Ultimate Field = 9T Nominal Field = 8.34 Tesla

10 Series dipoles Magnetic Field at Quench B [Tesla] A. Siemko/LHC-MTA Training Quenches at 1.8K - second and next runs HCMBB-A Ultimate Field = 9T Quench Number HCMBB-A HCMBB-A Nominal Field = 8.34 Tesla Training Quench No Quench Provoked Quench

11 Series dipoles Quench Performance at 1.8 K Magnetic Field at Quench B [Tesla] Quench Number HCMBB-A Ultimate Field = 9T Nominal Field = 8.34 Tesla 2nd Thermal cycle A. Siemko/LHC-MTA. Training Quench No Quench Provoked Quench

12 Cable delivery Arjan VERWEIJ /LHC-MMS

13 String 2

14 String 2 Temperature [K] Liquefactor SSS3 MB1 MB2 MB3 1.0E E-01 Insulation Vacuum [mbar] E SSS4 DFB 1.0E E-04 Insulation Vacuum E E-06 2.août 7.août 12.août 17.août 22.août 27.août 1.sept First cool-down R. Saban / AC

15 String 2 Temperature [K] 15 MB3 MQ2 10 MB1 MB2 MQ1 5 MQ2 MQ sept 00:00 14.sept 02:00 14.sept 04:00 14.sept 06:00 14.sept 08:00 14.sept 10:00 14.sept 12:00 14.sept 14:00 14.sept 16:00 14.sept 18:00 First cool-down R. Saban / AC

16 String 2 Ramp to nominal current F. Rodriguez-Mateos, R. Saban

17 Collaboration with Japan

18 Collaboration with the United States

19 Collaboration with the United States IR Quadrupoles are in production Prototype quadrupole successfully tested 2nd prototype is now the first production magnet. Quench Current, A Pole Turn SS Inner Pole Turn RE Inner Wedge Inner Multiturn Inner Outer Full energy deposition trip 4.5 K TC1 230 T/m 205 T/m Superfluid TC Quench sequence Superfluid TC2 Quench Training of full-scale prototype IR quadrupole. US LHC Status, J. Strait, 7 Sep 01 Ramp to 220T/m without quench First production quadrupole collared coil.

20 Collaboration with the United States Beam separation dipoles are in production Two D1 s are complete and first is under test. Other 3 D1 cold masses are complete and being inserted in cryostats. One D2 cold mass is complete and the second is well along. Cryostats will arrive at the end of September. US LHC Status, J. Strait, 7 Sep 01

21 Collaboration with India

22 Collaboration with Russian Federation Abort septum

23 Magnets

24 Collaboration with Canada Warm quadrupole for cleaning insertions

25 Cryogenics Eight 18 kw cryoplants, four new and four upgraded from LEP. Eight cold compressors for the production of superfluid helium. Distributed cryogenics line in the tunnel.

26 Cryogenics First 18 kw plant

27 Cryogenics Cold Compressor Box Installed 25 July 2001 IHI/ Linde 1.8 K Unit

28 Vacuum The electron cloud instability is a critical factor, already observed in B-factories and in the SPS. It produces a heavy heat load on the cryogenic system. It can be cured with gaps in the bunch train and conditioning of the beam screen.

29 F Zimmermann SL/AP the Large Hadron Collider accelerator Vacuum

30 Vacuum 2.4 SEY reduction by scrubbing δ max then 350 V 23 V 44 V 97 V 99 V 340 V 354 V 830 V E E E E E E-01 V. Baglin et al. LHC/VAC 350 V Dose electrons (C/mm 2 ) δ max ~ 1.2 at 10-2 C/mm 2 i.e. ~ 3 (10) days of electron scrubbing with P = 0.2 W/m and <E> = 100 ev in dipole (field free) region

31 Accelerating system Main RF. Eight MHz cavities per beam. 2 MV per cavity. Capture RF. Four MHz cavities per beam, 750 kv per cavity.

32 Radiofrequency Power test of first module

33 Civil engineering

34 Civil engineering

35 Civil engineering

36 Civil engineering Vault support cables

37 Civil engineering

38 Civil engineering - CMS cavern at Point 1

39 Civil engineering - CMS cavern at Point 1

40 Civil engineering

41 the Large Hadron Collider accelerator