PMG Slides - Fermilab

PMG Slides - Fermilab

Eric Prebys, Program Director US LHC Accelerator Research Program (LARP) Ultimate tribute Sept 10, 2008 * 10/31/2008 LHC Status Commissioning Sept. 19 Incident Future upgrade plans Phase I Phase II, including injector chain US Contributions LHC Accelerator Research Program (LARP) Accelerator Projects for the LHC (APL) E. Prebys, LARP Presentation to JOG 10/31/2008 2

The LHC startup on September 10 was the most elaborate media event in the history of physics (history of science?) Fermilab staged a simultaneous event in the [email protected] Remote Operations Center (ROC) Over 400 staff, reporters, and members of the public attended the 1:30 AM (CDT) Pajama Party Local monitoring Generic synoptic display Access to LHC eLogBook Full CMS event displays Selected LHC accelerator processes E. Prebys, LARP Presentation to JOG 10/31/2008 3 9:35 First beam injected 9:58 beam past CMS to point 6 dump

10:15 beam to point 1 (ATLAS) 10:26 First turn! and there was much rejoicing E. Prebys, LARP Presentation to JOG 10/31/2008 4 Beam 2 was circulated in 2 hours After a few days, beam had been captured with RF and achieved several hour lifetimes. Optics measurements showed some small polarity problems, but no major problems Switching to beam 1 when a tranformer problem held beam off for a few days E. Prebys, LARP Presentation to JOG 10/31/2008

5 On September 19th, sector 3-4 was being ramped to 9.3 kA, the equivalent of 5.5 TeV At 11:18AM, a quench developed in the splice between dipole C24 and quadrupole Q24 Not initially detected by quench protection circuit Power supply tripped at .46 sec Discharge switches activated at .86 sec Within the first second, and arc formed at the site of the quench All other sectors had already been ramped to this level Sector 3-4 had previously only been ramped to 7 kA (4.1 TeV) Helium pressure rose beyond .13 MPa and ruptured into the insulation vacuum. Vacuum also degraded in the beam pipe

*Taken from Oct. 15 Interim Report and private communications E. Prebys, LARP Presentation to JOG 10/31/2008 6 Electrical noise triggered quench detection in other subsectors. Helium escaped into the insulation vacuum Most subsectors remained below the limit of 2.1 MPa except 19-21, which triggered the relief valves and vented into the tunnel. Pressure differential at the vaccum barriers between vacuum subsectors resulted in large forces Short straight sections moved significantly on their stands, sometimes breaking loose from the concrete anchors. The motion broke several He jumpers, resulting in more Helium loss. In the end, approximately 6 out of 15 tonnes of Helium were lost from the sector (~3 x Macys Thanksgiving Parade)

E. Prebys, LARP Presentation to JOG 10/31/2008 7 E. Prebys, LARP Presentation to JOG 10/31/2008 8 CERN is working to address the problem efficiently and effectively. At most 24 dipoles and 5 quadrupoles will have to be replaced Damage primarily to the superinsulation Cold mass probably OK in most cases Most can be repaired outside of the tunnel Studying contamination of vacuum pipe

Detailed scope and schedule still being determined. Both vacuum pipes compromised Endoscope shows soot and MLI not as bad as expected Investigating course of action Investigating Improvements in detection Indirect: Joule-Thompson valves Direct: Improvements to quench detection Improvements to mitigation Pressure relief system needs to be improved E. Prebys, LARP Presentation to JOG 10/31/2008 9 2008 run lost LARP planned to use this run to help commission instrumentation

-> some tasks will be carried over into FY10 Start date nominally May 1, but official schedule not formalized yet Mitigation could push it later Nevertheless, US accelerator programs take it as gospel until we hear differently. Had planned to use Winter shutdown to train magnets to 7 TeV Although its not official yet, extremely likely that entire 2009 run will be at 5 TeV. Rolf Heuer (DG designate) wisely puts utmost consideration on integrity of machine. Unclear how incident will affect long term upgrade path Heuer has stated that preparations will proceed assuming earliest date (currently end of 2012 for Phase I), but that upgrade will not occur until it makes sense from a physics standpoint. Need and scope of US assistance in addressing the incident still being discussed.

Will of course render assistance if needed, but could draw money away from other activities. E. Prebys, LARP Presentation to JOG 10/31/2008 10 Initial operation Ramp up to 1x1034 cm-2s-1 Phase I upgrade (inner triplets only) After ~2 years of operation (~2012) Details approaching base line Replace 70 mm triplet quads with 120 mm quads * goes from 50->25 cm Luminosity goes to 2.5x1034 cm-2s-1 Phase II upgrade Second half of next decade (nominally 2016) Luminosity goal: 1x1035 Details still under study New technology for larger aperture quads (Nb Sn) 3 crab cavities? Improved injector chain (SPL+PS2)

E. Prebys, LARP Presentation to JOG 10/31/2008 11 Proton flux / Beam power Linac2 50 MeV 160 MeV SPL RCPSB PSB 1.4 GeV ~ 5 GeV Output energy Linac4 26 GeV 40 60 GeV PS PS2 (PS2+) SPS 450 GeV 1 TeV

LHC 7 TeV ~ 14 TeV SPS+ DLHC SPL Linac4: PSB injector (160 MeV) SPL: Superconducting Proton Linac (~ 5 GeV) SPL: RCPSB injector (0.16 to 0.4-1 GeV) RCPSB: Rapid Cycling PSB (0.4-1 to ~ 5 GeV) PS2: High Energy PS (~ 5 to 50 GeV 0.3 Hz) PS2+: Superconducting PS (~ 5 to 50 GeV 0.3 Hz) SPS+: Superconducting SPS (50 to1000 GeV) DLHC: Double energy LHC (1 to ~14 TeV) M. Benedikt, R. Garoby, CERN DG E. Prebys, LARP Presentation to JOG 10/31/2008 12 E. Prebys, LARP Presentation to JOG 10/31/2008

13 Inner triplets and feed boxes at CMS and ATLAS IPs Fermilab-KEK collaboration In spite of some commissioning problems, triplets installed and have been ramped to full 7 TeV US LHC Accelerator Research Program (LARP) Focus of this talk Coordinates US R&D for the LHC FNAL, BNL, LBNL, SLAC, and some UT Austin Some instrumentation deliverables for initial operation R&D for future luminosity upgrades

Major effort to develop Nb3Sn magnets for Phase II upgrades LHC Accelerator-Fermilab Software Group formed to address gaps in LARP program Has developed close relationship with CERN controls group (Elliott McCrory resident at CERN) Now working with LARP to integrate instrumentation into operations. Accelerator Projects for the LHC (APL) New New program to coordinate larger scale construction projects for the LHC Currently being organized around several phase-I activities Exact scope and nature being determined E. Prebys, LARP Presentation to JOG 10/31/2008

14 E. Prebys, LARP Presentation to JOG 10/31/2008 15 Schottky detector Used for non-perturbative tune measurements (+chromaticities, momentum spread and transverse emmitances) Tune tracking Implement a PLL with pick-ups and quads to lock LHC tune Investigating generalization to chromaticity tracking AC dipole Use AC dipole to drive beam Measure both linear and non-linear beam optics Done with UT Austin in conjunction with Fermilab accelerator PhD program Luminosity monitor

Not finished High radiation ionization detector integrated with the LHC neutral beam absorber (TAN) at IP 1 and 5. E. Prebys, LARP Presentation to JOG 10/31/2008 16 Rotating collimators Can rotate different facets into place after catastrophic beam incidents Aim for prototype in FY09 Crystal Collimation CRYSTAL Collaboration T980 Beam-beam studies General simulation Electron lens Wire compensation

Electron cloud studies Study effects of electron cloud in LHC and injector chain E. Prebys, LARP Presentation to JOG 10/31/2008 17 Crab cavities Transverse fields rotate bunches to compensate for crossing angle in final upgrade Goal: one cavity in Phase I upgrade, 2 (global) or 4 (local) in Phase II Significant opportunity Collaboration with KEK, CERN, and Daresbury But big job, lots of $$ PS2 opportunities Significant synergy with Project X Ecloud Injection, collective instabilities Laser stripping RF E. Prebys, LARP Presentation to JOG

10/31/2008 18 Decreasing spot size at interaction region requires larger apertures and higher gradients at focusing quads High gradient/large aperture means higher fields at the coil than are possible with Traditional NbTi A major part of LARP (half budget) is focused on developing accererator grade quads based on Nb 3Sn Success of magnet program ~success of LARP E. Prebys, LARP Presentation to JOG 10/31/2008 19 Magnet groups at FNAL, BNL, and LBNL working to develop 4m Nb3Sn magnet appropriate for use in the LHC Phase II upgrade. Currently pushing all parameters

Plan first accelerator quality prototype (QA) to be plug compatible with Phase I NbTi magnets Long Quad (LQ): 4m quad with 90 mm aperture High field Quad (HQ): 1m quad with 130 mm aperture Nb3Sn would give larger termperature margin Parameters of final prototype (QB) will be determined by Phase II optics decisions E. Prebys, LARP Presentation to JOG 10/31/2008 20 Long Term Visitors program Pay transportations and living expenses for US scientists working at CERN for extended periods (at least 6 months/year) Interested parties coordinate with a CERN sponsor and apply to the program (Jim Strait) Plan to support 4 in FY09 Toohig Fellowship Named for Tim Toohig Open to recent PhDs Successful candidates divide their time between CERN and one of

the four host labs. Currently 4 Toohig Fellows in program E. Prebys, LARP Presentation to JOG 10/31/2008 21 Long Term Visitors At CERN (decoupled of LHC operation) Jim Strait, FNAL, working with Rdiger Schmidt on machine protection Steve Peggs, BNL, working with Rogelio Tomas Garcia and Frank Schmidt on beta beating and coupling in LHC (currently studying SPS data) Pending (need LHC machine time) Eliana Gianfelice-Wendt, FNAL, working with Brennan Goddard on injection and abort gap commissioning (was at CERN, now called back) Alan Fisher, SLAC, to work with Berndt Dehning on BLM system Toohig Fellows Helene Felice, LBNL, magnets

Ricardo DeMaria, BNL, PS2 studies Ryoichi Miyamoto, BNL, instrumentation Daruisz Bocian, FNAL, magnets Toohig alum Important to have focus for collaboration Rama Calaga, BNL postdoc, LHC commissioning and crab cavity development Given up idea of generic commissioners In general, integration of LARP personnel very successful Good words from both sides *only includes people directly supported by LARP E. Prebys, LARP Presentation to JOG 10/31/2008 22

LARP FY09 budget version v0.1 September 12, 2008 WBS US LHC Accelerator Research Program 1 Accelerator Systems Markiewicz 1.1 Instrumentation Ratti 1.3 Collimation Markiewicz 1.4 Accelerator Physics Fischer 2 Magnet Systems Wanderer 2.2 Model Quadrupoles Sabbi 2.3 Long Quadrupoles Ambrosio 2.4 Materials Ghosh 3 Programmatic Activities Prebys 3.1 Administration Prebys 3.2 Commissioning TBD

Assigned Total 4 Contingency E. Prebys E. Prebys, LARP Presentation to JOG Labor+MTSC Total BNL FNAL LBNL SLAC Unassigned [$k] 11,960 2,242 2,979 3,629 1,467 1,643 2,901 380 311 1,005 1,205 925 50 35 800 40 1,121 35 101 0 985 855

295 175 205 180 5,059 1,071 1,769 2,219 2,000 538.4 332 1129.8 2,128 374 1,116 638 931 159 321 452 2,357 791 899 405 262 2,107 741 749 405 212 250 50 150 0 50 10,317 2,242

2,979 3,629 1,467 1,643 1,642.7 10/31/2008 23 The current LARP came into being in a period of strong growth Even with lumi and rotating collimators ramping down, it is impossible to support everything on the plate at a reasonable level New opportunities very exciting Crab cavities PS2 This year is only possible because of scientific labor contributed in accordance with core competencies of the labs

Order ~5 FTE total (=$1.5M) General agreement this is seed money and cannot continue Have to make some difficult decisions for FY10 and beyond E. Prebys, LARP Presentation to JOG 10/31/2008 24 Starting the FY10 budget process now Significant discussion at our CM11 collaboration meeting at FNAL Working with L1 and L2 managers to determine a 5 year plan for existing and proposed programs Priorities Lumi monitor must work! LARP credibility depends on it Magnet program must deliver a prototype on a time scale appropriate to the Phase II upgrade

We must deliver a rotating collimator on a time scale appropriate for consideration of installation (~Phase I) Must continue to support Fellows and Visitors, at least at some level Beyond that, everything fair game Give priority to Well identified goal (e.g. crab cavity design, ecloud feedback specification) Multi-lab interest Continue process throughout year with the goal of determining the cut list at our April collaboration meeting. unless of course we get a lot more money E. Prebys, LARP Presentation to JOG 10/31/2008

25 LARP is not really equipped to deal with large deliverables Primarily an R&D organization Insufficient contingency This was highlighted by the problems with the luminosity monitor. APL is being developed to handle larger projects with hard deliverables. Initially comprises projects for the Phase I upgrade. Considering an ongoing relationship where LARP R&D feeds into APL projects. E. Prebys, LARP Presentation to JOG 10/31/2008 26 Priority 1: NbTi separator dipoles based on RHIC design Feedboxes

Priority 2: Laser wire profile monitor for LINAC4 LLRF for LINAC4 Priority 3: 5 Rotatable collimators (asynchronous to Phase I) E. Prebys, LARP Presentation to JOG 10/31/2008 27 Steve Peggs acting program manager Searching for permanent program manager Establishing DOE project office Schedule CD-0: CD-1: CD-2: CD-3: CD-4:

very soon Q2 FY09 Q4 FY09 Q2 FY10 Q4 FY12 E. Prebys, LARP Presentation to JOG 10/31/2008 28 The turn on of the LHC was truly incredible. Recent events are unfortunate, but these things happen, and CERN is dealing with the problem as efficiently as possible. The US has made significant contributions to the accelerator effort, and will continue to do so through the LARP, LAFS and APL programs. Limited only by resources E. Prebys, LARP Presentation to JOG 10/31/2008 29

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