1 / 68

CDF

CDF. UC has long History with CDF - since before the beginning (Cronin)- design, construction (innovative trigger system), management, leadership, postdoc and student education;

armand-bailey
Download Presentation

CDF

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CDF • UC has long History with CDF - since before the beginning (Cronin)- design, construction (innovative trigger system), management, leadership, postdoc and student education; • Unique physics opportunity- have entered the Higgs sensitivity region, less material near beam pipe, low-mass region is where EWK precision data say the SM Higgs is (if it is- my bet is no). • Unique leverage (it’s 50 miles by car away, not so political, and we are already invested); • Consequently lots of bang per buck (BPB*). We have a chance make a big contribution. High risk, but high, influential, and satisfying payoff. * Sheldon- can we mutually make a BPB table? NSF Site Visit

  2. CDF Chicago Level-1 GroupCarla Grosso-Pilcher, Dan Krop, Scott Wilbur, Henry Frisch • Dataflow of CDF “Deadtimeless” • Trigger and DAQ Level 1 Trigger: Selects electrons, muons, tracks, jets and missing energy. Our responsibilities: • Development • Commissioning • Maintenance • Monitoring Designed-in Flexibility: Included other triggers (TOF, BBC, diffractive) • Improved resolution of missing energy, used at Level 2. Detector • 7.6 MHz Crossing Rate • 132 ns clock cycle • L1 Storage Pipeline: • 42 Clock Cycles deep • Level1: • 7.6MHz Synchronous pipeline • 5544ns latency • <35 kHz Accept rate • L1 Trigger • L1 Accept • Level2: • Asynchronous 2 stage pipeline • ~20µs latency • 800Hz Accept rate • L2 Trigger • L2 Buffers: • 4 Events • L2 Accept • L1 + L2 Rejection: >2000:1 • DAQ Buffers NSF Site Visit

  3. 24/7 Trigger Monitoring (Carla Grosso-Pilcher) • Hardware very robust, no failures since initial debugging. • Performance vs luminosity: Linit. increased by a factor of 10. • Trigmon good monitor: • -> find problems with the detector. • -> prompt response during data taking. • One store ( time) • <- noise • Trigger cross section for electron/photon ET>12 GeV • Note: constant versus L. NSF Site Visit

  4. 24/7 Trigger Monitoring (Carla Grosso-Pilcher) • 24 hour online monitoring of trigger front-end performance. • Almost always NOT trigger problems, front-end electronics in collision hall (not UC) sensitive to glitches due to radiation. • Entries in bottom plots correspond to errors in the tower energy sent to the trigger. NSF Site Visit

  5. Trigger Upgrades(Dan and Carla) NSF Site Visit Commissioned new L2 decision PC’s. • Decreased algorithmic latency. • Expanded test-stand capabilities and improved checkout procedure. • Commissioned replacement boards. Improved operator and expert documentation. Identified and corrected system errors.

  6. Analysis NSF Site Visit Focus has been on three areas • `surgical’ measurements of low mass states in EWK events (non-SM Higgs, e.g.) • Events with gauge bosons and 3rd generation fermions • Very h;gh-Pt W’s and Z’s (no longer competitive with LHC) Two on-going analyses and one just published: • Same-sign and cross-generation multi-lepton signatures in W and Z events (`lepton-jets’)- Scott Wilbur’s thesis • 3rd analysis of ttbar-gamma and lgmet Three PhD’s- all 3 superb, and very effective on CMS or ATLAS

  7. Physics Analysis- Loginov NSF Site Visit Andrei Loginov’s Thesis: • Signature-based lepton+gamma+met (looking for more eeggmet events, gauge-mediated SUSY, Hidden Valley whatzits, …. (follow up to Jeff Berryhill’slgmet thesis, Dave Toback’sdileptop +X analysis • Top pair radiative (ttbar-gamma) events • Top a good place to look for decay chains involving photons- e.g. Gauge Mediated SUSY, Hidden Valley, etc.,.. • Calibration channel for ttbar+Higss (small sigma!)

  8. Physics Analysis- Shreyber NSF Site Visit Irina Shreyber’s Thesis: • Ttbar gamma with more luminosity, and also ratio to ttbar • Interesting story- Irina’s degree was in Steel Alloys (Metallurgical Institute)- now at Saclay

  9. Physics Analysis- Paramonov NSF Site Visit Sasha Paramonov’s Thesis: • Signature-based high Pt Z’s and W’s search found a `bump’ in Z+jets at 174 GeV- even tho it looked like a fluctuation we took it seriously • Bump went away with more data, and analysis morphed into a neutral-current search for top -> Z+charm

  10. Physics Analysis- Paramonov NSF Site Visit :Sasha, Florencia, Mrenna, D’onofrio took advantage of top to Zc to do a detailed study of Z-jet balancing, looking toward LHC| (measure Zpt precisely, look at one jet opposite and calculate response)

  11. Physics Analysis- Auerback, Loginov, Schreyber, Tipton NSF Site Visit Ben Auerbach’s Thesis (Tipton student): • Top pair radiative (ttbar-gamma) events • Measure ttg/tt; use tt and Wg as control channels

  12. Physics Analysis- Scott Wilbur, Dan Krop, Carla NSF Site Visit Scott Wilbur’s Thesis (est: by end of July): • Signature-based lepton+gamma+met (looking for more eeggmet events, gauge-mediated SUSY, Hidden Valley whatzits, …. (follow up to Jeff Berryhill’slgmet thesis, Dave Toback’sdileptop +X analysis • Top pair radiative (ttbar-gamma) events • Top a good place to look for decay chains involving photons- e.g. Gauge Mediated SUSY, Hidden Valley, etc.,.. • Calibration channel for ttbar+Higss (small sigma!)

  13. Physics Analysis-Carla 1 sigma pi-K separation Work in progress (not as easy as it sounds) Can K/pi identification help on identifying b-quark and bbar-quark in top decays, and then lead to better resolution in the top mass?? Best measurement from Lepton + jets channel, with tagging of b-quarks from displaced vertices. Leaves two-fold ambiguity. -> look at using flavor tagging by identifying K in jets with TOF, will allow to pair the b-jet candidates with the corresponding W from a t-quark.

  14. EDUCATIONOpportunity to Educate Hands-On: then move to LHC analysis NSF Site Visit Students: Redlinger(first reconstruction of masses from tracks in jets at Tevatron), Kopp (first precise W/Z ratio, W width), Saltzberg (first precise W mass and method), Romano (first top dileptons), Toback, Berryhill (first signature-based searches), Loginov, Shreyber (first measurement of ttbar-gamma), .. (also Tsai, Snider, Derwent, Wahl, Paramonov-plus Incandela and Somalwar (monpoles)- all hands-on types) Postdocs- Myron Campbell, Tony Liss, Dan Amidei, Claudio Campagnari, Sarah Eno, Greg Sullivan, Peter Wilson, Ray Culbertson, Bruce Knutson, Un-Ki Yang, Maria Spiropoulu,

  15. Bang For Buck- NSF Site Visit Group (Carla) plays a key role in 24-7 monitoring of the trigger and detector (quote JJ) 2 of last 3 students (Loginov, Shreyber) were not paid by NSF-Really good Russian student applying in fall (have had 3 in a row- this would be 4th). Quality of post-docs has been high- expect to continue to be attractive to the best (we got Wetstein: (unpaid by NSF) joint with ANL on Psec) Adding Rosner (we hope)- like having 2 more gears (tell Z story of Run 0 over a beer)

  16. Next 3 years – if no Run III NSF Site Visit Difficult time to knows the future of CDF right now- we would like to plan for both cases Base Plan (assume at least one more year of data- followed by 2 of analysis) (as orig. submitted): • Carla, Frisch, ,1 postdoc, 2 students, 1 undergrad • Finish present analyses, possibly one more if find something useful-publish (takes at least 1 year); • Continue detector monitoring, fixing as long as needed Plan would be to focus on the SM light Higgs and keep an (a priori) eye open for non-SM Higgs

  17. We played a role in the Run III `saga’- truly deeply concerned about Fermilab’s next 3 years with little physics, schedule creep, and non-competvness `Your Vision of a Future Tevatron Program’ (request from Chris) Henry Frisch University of Chicago • Patrick Huber Fermilab 3/4/2010

  18. CDF Group Budget as orig. proposed(pre Run III possibility) Senior Personnel (Carla + 2mo of Henry) 105,383 Postdoc 53,000 Graduate Students 92,275 Secretarial 5,799 Local Business Center 1,365 Domestic Travel 6,000 Foreign Travel 0 Materials and Supplies 15,000 Permanent Equipment 25,000 Tuition 46,388 Total with all lunatic fringe etc 546,971

  19. Next 3 years- Run 3 NSF Site Visit If Run III goes ahead will there be additional NSF support in addition to DoE support? (HEPAP and P5 represent both); Run III Plan (assume 3 more years of data- followed by 1 of analysis, addl. univ. support): • Carla, Frisch, Rosner, 2 postdocs, 2 students, 1 undergrad, 2 visitors • Work on energy-flow jet resolution for SM H->bbar exclusion across the whole mass range- need critical mass (Kuhlmann, others- many years of work so far); • Continue detector monitoring, fixing as long as needed

  20. The Development of Large-Area Thin Planar Psec Photodetectors Henry Frisch NSF Site Visit

  21. Three Goals of a New (1 yr-old) Collaborative Effort: • Large-Area Low-Cost Photodetectors with good correlated time and space resolution (target 10 $/sq-in incremental areal cost) • Large-Area TOF particle/photon detectors with psec time resolution ( < 1psec at 100 p.e.) • Understanding photocathodes so that we can reliably make high QE, tailor the spectral response, and develop new materials and geometries (QE > 50%?, public formula) NSF Site Visit

  22. The Large-Area Psec Photo-detector Collaboration 3 National Labs, 6 Divisions at Argonne, 3 US small companies; electronics expertise at UC Berkely, and the Universities of Chicago and Hawaii Goal of 3-year R&D- commercializable modules. DOE Funded (100K$/yr NSF) NSF Site Visit

  23. 4 Groups + Integration and Management NSF Site Visit

  24. PET (UC/BSD, UCB, Lyon) Collider (UC, ANL,Saclay. Mass Spec Security (TBD) DUSEL (Matt, Mayly, Bob, John, ..) K->pnn (UC(?)) Parallel Efforts on Specific Applications Explicit strategy for staying on task . LAPD Detector Development Muon Cooling Muons,Inc (SBIR) ANL,Arradiance,Chicago,Fermilab, Hawaii,Muons,Inc,SLAC,SSL/UCB, Synkera, U. Wash. Drawing Not To Scale (!) All these need work- naturally tend to lag the reality of the detector development NSF Site Visit

  25. Detector Development- 3 Prongs MCP development- use modern fabrication processes to control emissivities, resistivities, out-gassing Use Atomic Layer Deposition for emissive material (amplification) on cheap inert substrates (glass capillary arrays, AAO). Scalable to large sizes; economical; pure – i.e. chemically robust and (it seems- see below) stable Readout: Use transmission lines and modern chip technologies for high speed cheap low-power high-density readout. Anode is a 50-ohm stripline. Scalable up to many feet in length ; readout 2 ends; CMOS sampling onto capacitors- fast, cheap, low-power (New idea- make MCP-PMT tiles on single PC-card readout- see below) Use computational advances -simulation as basis for design Modern computing tools allow simulation at level of basic processes- validate with data. Use for `rational design’ (Klaus Attenkofer’s phrase). NSF Site Visit

  26. Micro-channel Plates PMTs Satisfies small feature size and homogeneity Photon and electron paths are short- few mm to microns=>fast, uniform Planar geometry=>scalable to large areas NSF Site Visit

  27. Simplifying MCP Construction Conventional Pb-glass MCP OLD Incom Glass Substrate NEW Chemically produced and treated Pb-glass does 3-functions: • Provide pores • Resistive layer supplies electric field in the pore • Pb-oxide layer provides secondary electron emission Separate the three functions: • Hard glass substrate provides pores; • Tuned Resistive Layer (ALD) provides current for electric field (possible NTC?); • Specific Emitting layer provides SEE NSF Site Visit

  28. Where we are with glass substrates .075” ~150 20m pores Hexagonal bundle of capillaries is called a `multi’. Each multi has ~15,000 capillaries Many many multis in an 8”-square plate. • Have received multiple samples of 10-micron, 20-micron, 40-micron glass substrates from Incom in 3/4”-sq and 33 mm round formats – will show results after ALD below. First 8” plates also have been received. • Two developments at Incom (our glass folks)- 1) 2nd gen 8” plates are being fabricated and the process improved, and 2) replacement of some multis with solid islands (`pads’) for installation of mechanical spacers. Idea is low cost amplification section - so far so good (hesitate to quote a # yet). INCOM glass substrate Incom, Inc Charlton, MA NSF Site Visit

  29. ALD for Emissive Coating Conventional MCP’s: Alternative ALD Coatings: (ALD SiO2 also) • Daimond? Other unexplored materials? • possible discrete dynode structure (speed!) Jeff Elam , Zeke Insepov, Slade Jokela NSF Site Visit 29

  30. ALD for Emissive Coating Conventional MCP’s: Alternative ALD Coatings: (ALD SiO2 also) • Daimond? Other unexplored materials? • possible discrete dynode structure (speed!) Jeff Elam , Zeke Insepov, Slade Jokela NSF Site Visit 30

  31. Atomic Layer Deposition (ALD) Thin Film Coating Technology • Atomic level thickness control • Deposit nearly any material • Precise coatings on 3-D objects (JE) • Lots of possible materials => much room for higher performance Jeff Elam pictures NSF Site Visit

  32. High (multi-GHz) ABW readout Note signal is differential between ground (inside, top), and PC traces (outside) Anode development has been NSF project. NSF Site Visit

  33. Simulation (crosses all groups)ValentinIvanov, Zeke Insepov, Zeke Yusof, Sergey Antipov, Matt Wetstein (joint apptment- ANL funded) • 10μm pore • 40μm spacing • Funnel (!) • Large Area Photodetector Development Collaboration NSF Site Visit • 33

  34. UCB Concept ‘B’ 8” Tube Design • Jason McPhate • Experimental Astrophysics Group • Space Sciences Laboratory • University of California, Berkeley NSF Site Visit • 3 Mar 2010 • 34

  35. The 24”x16” `SuperModule NSF Site Visit

  36. Sealed Tube (Tile) Construction • All (cheap) glass • Anode is silk-screened • No pins, penetrations • No internal connections • Anode determines locations (i.e. no mech tolerancing for position resolution) • Fastens with double-sticky to readout Tray: so can tile different length strings, areas • Tile Factory in works (ANL) NSF Site Visit

  37. 8” Glass Package Component Costs Rich Northrop Fabricated per unit cost estimates 30 1000 3000 10,000 100,000 Window (1@) $1813 11108 Side wall (1@) $7855524840 Base plate (1@) $201311108 Rod Spacers (75@) $7 32 1.20.80 Total $641 $306 $224 $158 $116 ---------Quotations--------- -----------------------Cost estimates---------------------- The above prices are for water jet cut B33 glass, tol. +- 0.010, except rod spacers +000 -0.004 To this add 2 8” plates (@250?), ALD (Bulk), PC, assembly NSF Site Visit

  38. PSEC-2 ASIC Chicago- Hawaii • 130nm IBM 8RF Process • This chip 4 channels, 256 deep analog ring buffer • Sampling tested at 11 GS/sec • Each channel has its own ADC- 9 bits eff (?) • The ADCs on this chip didn’t work due to leakage (silly, didn’t simulate slow easy things) - resubmitted, and test card out for fab with external ADC - will use 1 of 4 chnls • We’re learning from Breton, Delagnes, Ritt and Varner (Gary is of course a collaborator) NSF Site Visit

  39. ANL-UC Glass Hermetic Packaging Group • Proceed in 3 steps: 1) hermetic box; 2) Add MCP’s, readout, (Au cathode); 3) Add photocathode Box Box+ 8” MCPs Possible Au anode Box+MCP+PC Yr 3 Yr 2 Yr 1 NSF Site Visit

  40. At colliders we measure the 3-momenta of hadrons, but can’t follow the flavor-flow of quarks,the primaryobjects that are colliding. 2-orders-of-magnitude in time resolution would all us to measure ALL the information=>greatly enhanced discovery potential. Application to Colliders A real top candidate event from CDF- has top, antitop, each decaying into a W-boson and a b or antib. Goal- identify the quarks that make the jets. (explain why…) Specs: Signal: 50-10,000 photons Space resolution: 1 mm Time resolution 1 psec Cost: <100K$/m2: t-tbar -> W+bW-bbar-> e+ nu+c+sbar+b+bbar

  41. New Idea (?)-Differential TOF Rather than use the Start time of the collision, measure the difference in arrival times at the beta=c particles (photons, electrons and identified muons) and the hadrons, which arrive a few psec later.

  42. Application 2- Neutrino Physics • Spec: signal single photon, 100 ps time, 1 cm space, low cost/m2 (5-10K$/m2)* (Howard Nicholson) NSF Site Visit

  43. New Idea:Hi-res H2O NSF Site Visit Spatial Res of <1cm plus >50% coverage would allow working close to the walls => greater Fid/Tot ratio; Also would make curve of Fid/Tot flatter wrt to symmetry- could make a high, long, narrow (book-on-end) detector at smaller loss of F/T; Cavern height cheaper than width; robust tubes can stand more pressure Narrow may allow magnetic field (!)

  44. New idea: Hi-Res H20-continued NSF Site Visit 100 psec time resolution is 3cm space resolution ALONG photon direction; Transverse resolution on each photon should be sub-cm; Question- can one reconstruct tracks? Question- can one reconstruct vertices? Question- can one distinguish a pizero from an electron and 2 vertices from one? (4 tracks vs 1 too)

  45. New idea: Hi-Res H20-continued NSF Site Visit Question: Can we reconstruct the first 3 radiation lengths of an event with resolution ~1/10 of a radiation length? Handles on pizero-electron separation: 2 vs 1 vertices; no track vs 1 track between primary vertex and first photon conversion; 2 tracks (twice the photons) from the 2 conversion vertices; Know photon angle, lots of photons-fit to counter dispersion, scattering; Book-on-end aspect ratio helps against dispersion, scattering-have to look at whole picture.

  46. 500 ps timing resolution •  7.5 cm localization • D Application 3- Medical Imaging (PET) • Bill Moses Slide (Lyon) • c = 30 cm/ns • Can localize source along line of flight. • Time of flight information reduces noise in images. • Variance reduction given by 2D/ct. • 500 ps timing resolution5x reduction in variance! • Time of Flight Provides a Huge Performance Increase! • Largest Improvement in Large Patients NSF Site Visit

  47. Application 3- Medical Imaging (PET) Alternating radiator and cheap 30-50 psec planar mcp-pmt’s on each side Can we solve the depth-of-interaction problem and also use cheaper faster radiators? Depth in crystal by time-difference Simulations by Heejong Kim (Chicago) Heejong Kim Heejong Kim Depth in crystal by energy- asymmetry NSF Site Visit

  48. A radical idea driven by sampling calorimeters based om thin cheap fast photodetectors with correlated time and space waveform sampling • Both Photons Deposit >350 keV Bill Moses (Lyon) Alternating radiator and cheap 30-50 psec thin planar mcp-pmt’s on each side Give up on the 511 KeV energy cut for bkgd rejection (!?), Give up on the Compton fraction (!??), and instead use cheaper faster lower-density scintillator, adaptive algorithms, and large-area to beat down background. Question for wkshp- candidate scintillators (Ren-yuan suggests BaF2- even lower density candidates?) NSF Site Visit

  49. Medical Imaging (PET)-cont. Spec: signal 10,000 photons,30 ps time resolution , 1 mm space resolution, 30K$/m2, and commercializable for clinical use. SUMMARY However- truth in advertising- there is a long way to go (see Bill Moses’s talk at Clermont.) It looks promising, as it may be possible to produce large panels with better spatial and time resolution than possible with photomultipliers, and our initial estimates are that MCP-PMT’s may be as much as a factor of 10 cheaper. However, the development will take a collaborative effort on measurements and simulation (see papers by Heejong Kim et al on web). Talks are also underway among Clermont, Strasbourg, Lyon, and Chicago. N.B. independent funding now. NSF Site Visit

  50. Application 4- Cherenkov-sensitive Sampling Quasi- Digital Calorimeters A picture of an em shower in a cloud-chamber with ½” Pb plates (Rossi, p215- from CY Chao) Idea: planes on one side read both Cherenkov and scintillation light- on other only scintillation. • I A `cartoon’ of a fixed target geometry such as for JPARC’s KL-> pizeronunubar (at UC, Yao Wah) or LHCb NSF Site Visit

More Related