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LHC Status and CERNs future plans Lyn Evans. L. Evans – EDMS document no. 859415 2 Machine layout.

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Presentation on theme: "LHC Status and CERNs future plans Lyn Evans. L. Evans – EDMS document no. 859415 2 Machine layout."— Presentation transcript:

1 LHC Status and CERNs future plans Lyn Evans

2 L. Evans – EDMS document no Machine layout

3 L. Evans – EDMS document no Cryodipole overview

4 L. Evans – EDMS document no Short Straight Section overview

5 L. Evans – EDMS document no Bending strength of dipoles

6 L. Evans – EDMS document no Completion of magnet cryostating & tests, 1 March 2007 Cryostating425 FTE.years Cold tests640 FTE.years

7 L. Evans – EDMS document no Descent of the last magnet, 26 April km underground at 2 km/h!

8 L. Evans – EDMS document no Dipole-dipole interconnect

9 L. Evans – EDMS document no Dipole-dipole interconnect: electrical splices

10 L. Evans – EDMS document no Magnet interconnections

11 L. Evans – EDMS document no Global pressure test of Sector 4-5, 12 May 2007

12 L. Evans – EDMS document no Flushing machine - Wk 2 January 07 Before After Kapton bits Metal strips 50 h + 8 L of Water

13 L. Evans – EDMS document no Q1.R8

14 L. Evans – EDMS document no Cooldown of Sector 7-8 From RT to 80K precooling with LN tons of LN2 (64 trucks of 20 tons). Three weeks for the first sector. From 80K to 4.2K. Cooldown with refrigerator. Three weeks for the first sector tons of material to be cooled. From 4.2K to 1.9K. Cold compressors at 15 mbar. Four days for the first sector.

15 L. Evans – EDMS document no kW precooling to 80 K with LN2 (up to ~5 tons/h) Large helium refrigerator for cooling down to 4.5 K K to 75 K K to 20 K 41 g/s liquefaction

16 L. Evans – EDMS document no First cool-down of Sector 7-8

17 L. Evans – EDMS document no g/s GHe from 15 mbar with 4 stages Hydrodynamic cold compressors for 1.8 K refrigeration

18 L. Evans – EDMS document no Magnet temperature profile along Sector 7-8 during final cool down to He II First cool-down of Sector 7-8

19 L. Evans – EDMS document no Sector 7-8 Cooldown

20 L. Evans – EDMS document no First powering of main quadrupoles

21 L. Evans – EDMS document no Cool-Down until Saturday Cool-Down Speed

22 L. Evans – EDMS document no Installation & equipment commissioning Procurement problems of remaining components (DFBs, collimators) now settled Good progress of installation and interconnection work, proceeding at high pace in tunnel Numerous non-conformities intercepted by QA program, but resulting in added work and time Technical solutions found for inner triplet problems and repair well underway. Commissioning of first sectors can proceed by isolating faulty triplets, but will have to be re-done with repaired triplets (needing additional warm-up/cooldown cycles) First sector cooled down to nominal temperature and operated with superfluid helium; teething problems with cold compressor operation have now been fixed. Second sector being cooled down. Power tests have started.

23 L. Evans – EDMS document no General schedule Engineering run originally foreseen at end 2007 now precluded by delays in installation and equipment commissioning. 450 GeV operation now part of normal setting up procedure for beam commissioning to high-energy General schedule has been revised, accounting for inner triplet repairs and their impact on sector commissioning All technical systems commissioned to 7 TeV operation, and machine closed April 2008 Beam commissioning starts May 2008 First collisions at 14 TeV c.m. July 2008 Luminosity evolution will be dominated by our confidence in the machine protection system and by the ability of the detectors to absorb the rates. No provision in success-oriented schedule for major mishaps, e.g. additional warm-up/cooldown of sector

24 L. Evans – EDMS document no LHC General Schedule, 5 July 2007 Interconnection of the continuous cryostat Leak tests of the last sub-sectors Inner Triplets repairs & interconnections Global pressure test &Consolidation Flushing Cool-down Warm up Powering Tests Global pressure test &Consolidation Cool-down Powering Tests General schedule Baseline rev. 4.0

25 L. Evans – EDMS document no European Strategy Group (1/2) Consolidation and upgrade of injectors LHC upgrade and maximum performance injectors [Quotes from the official statement – July 14, 2006]

26 L. Evans – EDMS document no R & D for LHC upgrade and facility preparation for facility European Strategy Group (2/2) [Quotes from the official statement – July 14, 2006]

27 L. Evans – EDMS document no CERN accelerator complex

28 L. Evans – EDMS document no Upgrade procedure 1. Lack of reliability: Ageing accelerators (PS is 48 years old !) operating far beyond initial parameters need for new accelerators designed for the needs of SLHC need for new accelerators designed for the needs of SLHC 2. Main performance limitation: Excessive incoherent space charge tune spreads Q SC at injection in the PSB (50 MeV) and PS (1.4 GeV) because of the high required beam brightness N/ *. need to increase the injection energy in the synchrotrons need to increase the injection energy in the synchrotrons Increase injection energy in the PSB from 50 to 160 MeV kinetic Increase injection energy in the SPS from 25 to 50 GeV kinetic Design the PS successor (PS2) with an acceptable space charge effect for the maximum beam envisaged for SLHC: => injection energy of 4 GeV

29 L. Evans – EDMS document no Upgrade components

30 L. Evans – EDMS document no Layout of the new injectors SPS PS2 SPL Linac4 PS

31 L. Evans – EDMS document no accelerating tunnel klystron hall (above ground) H - source & RFQ Linac4 building and infrastructure

32 L. Evans – EDMS document no Linac4 and SPL buildings Linac4 tunnel SPL klystron gallery SPL tunnel Linac4 klystron hall

33 L. Evans – EDMS document no Ion speciesH-H- Output energy160 MeV Bunch frequency352.2 MHz Max. repetition rate2 Hz Beam pulse duration0.4 ms Chopping factor (beam on)62% Source current80 mA RFQ output current70 mA Linac current64 mA Average current during beam pulse40 mA Beam power5.1 kW Particles p. pulse Transverse emittance (source)0.2 mm mrad Transverse emittance (linac)0.4 mm mrad Stage 1: Linac4 (1/3) Linac4 beam characteristics

34 L. Evans – EDMS document no Linac4 structures H - source RFQ chopper DTL CCDTLPIMS 3 MeV 50 MeV 102 MeV MHz 160 MeV Stage 1: Linac4 (2/3)

35 L. Evans – EDMS document no Stage 1: Linac4 (3/3) Direct benefits of the new linac Direct benefits of the new linac Stop of Linac2: End of recurrent problems with Linac2 (vacuum leaks, etc.) End of use of obsolete RF triodes (hard to get + expensive) Higher performance: Space charge decreased by a factor of 2 in the PSB => potential to double the beam brightness and fill the PS with the LHC beam in a single pulse, => easier handling of high intensity. Potential to double the intensity per pulse. Low loss injection process (Charge exchange instead of betatron stacking) High flexibility for painting in the transverse and longitudinal planes (high speed chopper at 3 MeV in Linac4) First step towards the SPL: Linac4 will provide beam for commissioning LPSPL + PS2 without disturbing physics. Benefits for users of the PSB Benefits for users of the PSB Good match between space charge limits at injection in the PSB and PS => for LHC, no more long flat bottom at PS injection + shorter flat bottom at SPS injection: easier/ more reliable operation / potential for ultimate beam from the PS More intensity per pulse available for PSB beam users (ISOLDE) – up to 2 More PSB cycles available for other uses than LHC

36 L. Evans – EDMS document no different designs: CDR2 (2006) based on 700 MHz high-gradient cavities LPSPL for LHC (2007) with low beam power, for the needs of the LHC SPL at higher energy, for the needs of neutrino production Stage22 CDR2 LPSPL for SPS & LHC SPL Energy (GeV)3.545 Beam power (MW) Rep. frequency (Hz)502 Protons/pulse (x ) Av. Pulse current (mA) Pulse duration (ms) Bunch frequency (MHz)352.2 Physical length (m)430~ LPSPL and SPL beam characteristics Stage 2: LPSPL + PS2 (1/3)

37 L. Evans – EDMS document no PS2 PS Injection energy kinetic (GeV) Extraction energy kinetic (GeV) ~ 5013/25 Circumference (m) Maximum intensity LHC (25ns) (p/b) 4.0 x x Maximum intensity for fixed target physics (p/p) 1.2 x x Maximum energy per beam pulse (kJ) Max ramp rate (T/s) Repetition time at 50 GeV (s) ~ /2.4 Max. effective beam power (kW) Stage 2: LPSPL + PS2 (2/3) PS2 beam characteristics

38 L. Evans – EDMS document no Direct benefits of the LPSPL + PS2 Direct benefits of the LPSPL + PS2 Stop of PSB and PS: End of recurrent problems (damaged magnets in the PS, etc.) End of maintenance of equipment with multiple layers of modifications End of operation of old accelerators at their maximum capability Safer operation at higher proton flux (adequate shielding and collimation) Higher performance: Capability to deliver 2.2 the ultimate beam for LHC to the SPS => potential to prepare the SPS for supplying the beam required for the SLHC, Higher injection energy in the SPS + higher intensity and brightness => easier handling of high intensity. Potential to increase the intensity per pulse. Benefits for users of the LPSPL and PS2 Benefits for users of the LPSPL and PS2 More than 50 % of the LPSPL pulses will be available (not needed by PS2) => New nuclear physics experiments – extension of ISOLDE (if no EURISOL)… Upgraded characteristics of the PS2 beam wrt the PS (energy and flux) Potential for a higher proton flux from the SPS Stage 2: LPSPL + PS2 (3/3)

39 L. Evans – EDMS document no Upgrade the LPSPL into an SPL (multi- MW beam power at 2-5 GeV): Upgrade the LPSPL into an SPL (multi- MW beam power at 2-5 GeV): 50 Hz rate with upgraded infrastructure (electricity, water, cryo-plants, …) 40 mA beam current by doubling the number of klystrons in the superconducting part Possible users EURISOL (2 nd generation ISOL-type RIB facility) EURISOL (2 nd generation ISOL-type RIB facility) => special deflection system(s) out of the SPL into a transfer line => new experimental facility with capability to receive 5 MW beam power => potential of supplying -unstable isotopes to a -beam facility… Neutrino factory Neutrino factory => energy upgrade to 5 GeV (+70 m of sc accelerating structures) => 2 fixed energy rings for protons (accumulator & compressor) => accelerator complex with target, capture-cooling-acceleration (20-50 GeV) and storage Stage 2: SPL

40 L. Evans – EDMS document no CDR 2 Planning … Linac4 approval 3 MeV test place ready SPL & PS2 approval Start for Physics


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