latest news n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Latest News PowerPoint Presentation
Download Presentation
Latest News

Loading in 2 Seconds...

play fullscreen
1 / 20

Latest News

67 Vues Download Presentation
Télécharger la présentation

Latest News

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Latest News • SPSC approved two separate running periods for CNGS: one just after the commissioning (few 1018 p.o.t.) and one at the end of the run (1019 p.o.t.). • To be confirmed at the Research Board

  2. 2006 PS&SPS days(18-19/01/06) The Workshop focussed on the start-up of the PS & SPS complex in 2006 after the long shut-down in 2005 Session 1: What has been done Session 2: Re-commissioning and Testing the Equipment Session 3: Start-up with Beam (from the CCC) Summary and Action Plan

  3. Major issues • PS Main Power Supply • Spare rotor installed (after 2004 “near failure”) • No spare until July ’06 – even then it will take 1 - 2 months to repair • Many changes have been made in the PS that can affect the start-up Looks like a re-commissioning: • Clear procedures for checking all MM circuits (in particular PFW)  R.S. with AT/MEL • Cunning plan for the commissioning with beam with identified milestones and steps (analysis of the alignment and optics issues)  R.S. in collaboration with ABP and equipment groups. We must prepare procedures and tools for orbit analysis and realignment and for finding possible errors in the MM circuits • Tight constraints on the magnet re-alignment in case of need. • Review of the alignment procedures and vacuum system tolerances AT/VAC

  4. Major issues • SPS Controls and application SW big bang • Diluters (TPSG’s) for SPS septa • Cannot withstand a direct hit from a full LHC beam, but septa are protected • Just at the limit for nominal CNGS beam • Be careful about using TT40 for target practice • SPS impedance • Impedance reduction of the Kickers to be extended to other SPS kickers as soon as method demonstrated efficient  conceive measurements to determine effectiveness • Launch SPS transverse impedance review aiming at identifying and eliminating major sources • Access to CCC, new cards – EDH authorization • Clarification of CCC access conditions (within/out working hours) • Need to apply for CCC priv. Authorization

  5. Chamonix XIV • The minimum workable LHC • 3 sessions on plans and requirements for beam commissioning, machine protection and collimation, providers’ commitments • Magnetic requirements for commissioning • Experiment-machine interface • Installation • I-LHC • Sector test • 2 sessions: HW preparation and beam tests

  6. Staged commissioning plan for protons Stage I IV II III No beam Beam Beam • Pilot physics run • First collisions • 43 bunches, no crossing angle, no squeeze, moderate intensities • Push performance (156 bunches, partial squeeze in 1 and 5, push intensity) • 75ns operation • Establish multi-bunch operation, moderate intensities • Relaxed machine parameters (squeeze and crossing angle) • Push squeeze and crossing angle • 25ns operation I • Nominal crossing angle • Push squeeze • Increase intensity to 50% nominal • 25ns operation II • Push towards nominal performance R.Bailey, Chamonix XV, January 2006

  7. Ions Experiment side • ALICE, ATLAS and CMS will all take Pb-Pb data • Detectors and machine will be already commissioned with pp • ALICE requests • 4 week ion runs at the end of each year • first short run as early as possible Machine side • Start with early ion scheme (62 bunches instead of 592, 7 107 ions per bunch) • Will have to • Set up RF capture • Commission essential instrumentation • Commission squeeze in IR2 • Establish collisions • Could do (some of) this early on if injectors are ready (same optics as for p). Injection optics. • Ion runs could provide cool down of PS SPS LHC after proton operation • After early ion scheme run, increase number of bunches • Move to nominal when possible - From Chamonix XIV - Estimate ≥ 1 week for first setup Followed by physics run R.Bailey, Chamonix XV, January 2006

  8. The minimum workable LHC • Pilot at 7 TeV might be close to the damage limit  in particular if smaller than nominal emittance.  The injectors will have to provide a pilot with nominal (and certified?) emittance • Bake-out of some of the LSS (IR3/7) only in 2007-2008 (could be an issue for a pilot ion run @ 10-7 mbar) • Machine protection with ions: • General awareness that this needs to be addressed (thanks to John). • Lead ion collimation: need to go further in the studies for the nominal beam: • collimation efficiency, loss patterns for the different optics (injection – squeezed) • Effect of errors (orbit, beta-beating, etc…) • possible solutions

  9. The minimum workable LHC ATB Delays in the production of the collimators  some components have a delay of 6 month (after 6 months form the contract signature…..)  Need second installation campaign after standard, some elements delayed to SD 2007-8 BDI No intensity reading from BPM for the start-up?  very important tool for Day 1 debugging (aperture issues, etc.) Loss maps for ions required to determine position of additional BLMs Wire Scanners: in 2007 LEP electronics??, in 2008 new electronics? Issue of the quenches induced by a wire scan. What about ions? CO as usual missing man-power. Issue of the security of the access. No application SW responsible for a lot of the instruments (in particular beam profile monitors, tune measurement, luminosity monitors)

  10. Experiment Machine Interface • Main goal is optimizing luminosity for ATLAS and CMS (asking for 10 fb-1 /experiment for discovering the Higgs) . Deviations from main streamline have to be justified • CRAG: Comissioning and Running Advisory Group set-up to define the guidelines + Physics coordinator nominated (Massimiliano Ferro-Luzzi) • Issue of 25 vs. 75 ns running  the experiment too might want to run at 75 ns to test their capability of handling many events/crossing. • Luminosity measurements • what about ions? Is CdTe OK for monitoring luminosity during ion operation? • Compatibility of ALICE ZDC with luminosity monitor (luminosity monitor in front of the ZDC). • Proton run for ALICE  b* < 35 m because of the limitations in the strength for separation bump magnets

  11. Luminosity Monitor ZN ZP TCTH D2 Interaction with the LHC machine during operation (2) • The technology has been chosen recently • ZN only used in HI runs • ~10-20 % I just in front of ZN does not spoil the energy measurement. The effect on the measurement of the impact position of the particles is presently under study • The compatibility with the ZN depends on the amount of converter necessary for the luminosity monitor. If NOT compatible: • Place converter on movable support • Use ZN to monitor luminosity (and to bring beams into collision) Luminosity monitor IP2

  12. Conclusions: • Status of installation versus planning: • We are not on time, actual delays spans from 3 to 4 months • We are worried by the late procurement of DFB’s, Special SSS’s, and SSS’s with plugs, where peak delays of 5 months with respect to planning occurred • Cryo-magnet transport approaching nominal rates, SSS installation through Point 6 should allow to catch-up the SSS backlog • Leak test and leak finding require more time than expected • Hardware commissioning: • Sector 7-8 should be ready for hardware commissioning by August 2006 • The hardware commissioning of Sector 8-1 will not be finished this year  need to find solutions for sector test • Last Sectors (1-2 & 2-3) should be ready for HW commissioning by August 2007 S.Weisz

  13. ATTENTION: L‘ouverture provoque l'arret d'urgence general Contactez la Salle de Controle: Tel 77500 Installation and others… • 2006 marked by many incidents particularly at the end of the year • SPS Access System: (temporary) modifications to comply with INB requirements and get the permission to run in 2006. If you see that: • Open only in case of danger

  14. Compensatory measures: Run 2006 • Access doors: • Caps on the doors locks, but only in entry direction • Emergency exits non affected • Sector doors in the transfer lines used as emergency exits will be connected directly to neighboring AUG chains: • PPG66003 in TT6 in to extraction zone towards TI2 • PPG4004 in TT40 in the extraction zone towards TI8 and CNGS • PPG21161 in the interface zone between TT20 and target region TCC2. • PPG100611 in TT10 in the transfer tunnel between PS and SPS OPENING THE DOOR WILL TRIGGER AN EMERGENCY STOP OF SPS! EDMS: 698337

  15. SPS Upgrade Project: phases and milestones Introduction d’une voie câblée redondante Shutdown Shutdown Mesures compensatoires Voie câblée redondante + + Nouveau Système d’accès SPS Système d’accès SPS actuel Système d’accès SPS actuel t Run ‘’08 SPS+LHC Run ‘07 SPS+LHC Run ’06 SPS *Date suivant le schedule des accelerateurs EDMS: 698337

  16. I-LHC • Present schedule for the ion beam confirmed: • LEIR commissioning completion in April 2006 • PS commissioning – fall 2006 • SPS commissioning in 2007 (beginning or summer according to the fate of the Sector Test, if any) • LHC ion run in 2008. Would allow to cool down the machine after proton run. • Nominal beam starting in 2007 in LEIR • Ion source: some critical components have no spare (14 GHz generator  possibility buy 18 GHz generator and klystron) • Controls: still some work to be done • New FESA version in February ? • SW tests planned before start-up?

  17. Objectives 2006 • Controls with Java • Cycle editor (LSA) Optimization • Archives Ready • Alarms Full functionalities • PPM Copy For GM and FESA • Passerelle For GM and FESA • OASIS Improve speed connection • EQP Survey Ready • Cycle editor (LSA) GUI improvement

  18. I-LHC • LEIR commissioning (open issues): • Injection line (initial conditions and optics)  need to provide understood optics for Pb to OP • Lifetime with O4+: obstacle in BIPM?, e-cooling?, vacuum?, charge exchange cross-section not as low as initially thought (any data from other labs? GSI?), instabilities from ion trapping in the e-cooler • Optics measurements during the ramp: analyzed? • E-cooling need to be clearly demonstrated (BIPM and Schottky are vital) • Transverse feedback commissioning need to be completed • Collaboration and Implication of the vacuum colleagues desirable to attack the issues related to vacuum

  19. Sector Test • General agreement that it would be very useful: • Milestone for several services, equipments, … • Full integration test: all systems working together • Verification of the QA (polarities, apertures, etc..) • Test for the commissioning strategy (type of meas., tools for beam meas., … • Public relation • …provided no “bricolage”/short-cut is taken to get there

  20. Sector Test • Main concern: delivery of the feedboxes – transition normal temperature – cryogenic environment for the current leads (HTS) • If no delay reduction  drastic reduction of the HW commissioning time  mission impossible • What are the risk resulting from the reduced HW commissioning time? • Is the validity of the test being compromised? • What about delaying the Sector test (and the commissioning) by the present installation delay (4-5 months)? • Possible implication for the Ion commissioning in the SPS (Spring  Autumn 07?) • Revived the idea of testing some of the most critical magnets in the SPS extraction line (Q6). Feasible? When?