1 / 23

SLHC Tracker Layout

SLHC Tracker Layout. The UTOPIAn Perspective. Charles Young (SLAC). SLHC Parameters. Peak luminosity ~ 10 35 cm -2 sec -1 Average luminosity 4 x 10 34 cm -2 sec -1 Instantaneous rate important for detector layout and design purposes: Number of events per bunch crossing Bunch spacing

vondra
Download Presentation

SLHC Tracker Layout

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. SLHC Tracker Layout The UTOPIAn Perspective Charles Young (SLAC)

  2. SLHC Parameters • Peak luminosity ~ 1035 cm-2 sec-1 • Average luminosity 4 x 1034 cm-2 sec-1 • Instantaneous rate important for detector layout and design purposes: • Number of events per bunch crossing • Bunch spacing • 25 or 50 nsec • Detector integration time • One BC (at 25 nsec separation) UTOPIA Page 2

  3. Four SLHC Scenarios • Frank Zimmermann: four scenarios during February 2009 ATLAS Upgrade Week. • http://indico.cern.ch/conferenceDisplay.py?confId=45460#2009-02-27 • Early Separation (ES) • Full Crab Crossing (FCC) • Large Piwinski Angle (LPA) • Low Emittance (LE) a Large Emittance (LE) UTOPIA Page 3

  4. Luminosity Evolution From FZ’s talk average luminosity UTOPIA Page 4

  5. # Events per Crossing Max = 400 From FZ’s talk UTOPIA Page 5

  6. With Luminosity Leveling Min = 75 UTOPIA Page 6

  7. What is UTOPIA? • A very bad acronym for Upgrade Taskforce On Possible Innerdetector Layout • Members • Leonardo Rossi (Genova - chair) • Andrea Catinaccio (CERN) • Allan Clark (Geneva) • Nigel Hessey (NIKHEF) • Nikos Konstantinidis (UC London) • Andi Salzburger (CERN- DESY) • Teddy Todorov (Annecy) • Jeff Tseng (Oxford) • Norbert Wermes (Bonn) • Charlie Young (SLAC) UTOPIA Page 7

  8. Mandate • The mandate is to define a baseline layout for the central tracker in view of the Letter of Intent ATLAS will write for the SLHC. • As the physics focus of SLHC is not defined yet, we require that the new layout has at 1035cm-2s-1 the same performance as the present detector is expected to have at 1034cm-2s-1. • We should also take into proper consideration the need to build & commission such a detector in a relatively short time (~ 5 years). • The new layout should be optimized for the inner tracker, including pixel, short strip and long strip, and barrel plus endcap simultaneously. • The Task Force is expected to reach a result by October and then hand over the information to the LoI editors. UTOPIA Page 8

  9. UTOPIA Meetings • Meeting every 3 weeks • Six meetings so far • http://indico.cern.ch/categoryDisplay.py?categId=1389 • Some agenda items • Encourage comparison/validation of tools • Suggest layout with material estimates • Power estimate a cooling • Other considerations and wild ideas UTOPIA Page 9

  10. Current “A Basic Layout” • See presentation by Nigel Hessey (http://indico.cern.ch/conferenceDisplay.py?confId=61990) • 4 pixel layers, 3 short strip layers and 2 long strip layers • “Fixed length” barrel UTOPIA Page 10

  11. UTOPIA Page 11

  12. UTOPIA Page 12

  13. Power Estimates • See presentations by Norbert Wermes (http://indico.cern.ch/conferenceDisplay.py?confId=59516) and Alan Clark (http://indico.cern.ch/conferenceDisplay.py?confId=61990) • Consider contributions from: • Front end power dissipation (digital + analog) • Losses in local cabling • Leakage current x depletion voltage (depends on radiation dose) UTOPIA Page 13

  14. UTOPIA Page 14

  15. UTOPIA Page 15

  16. UTOPIA Page 16

  17. UTOPIA Page 17

  18. Primary Vertex Density Numbers from FZ’s talk luminosity leveling LHC/ATLAS Without leveling SLHC/Upgrade ~ 100 mm ~20 times higher UTOPIA Page 18

  19. z Resolution • Modified longitudinal impact parameter, zo x sin(q), resolution as a function of h for pions. ATLAS detector paper Figure 10.10 100 mm UTOPIA Page 19

  20. Desired Resolution • LHC/ATLAS:FOM ~ 2368 / 100 ~ 24. • SLHC/Upgrade:FOM ~ 100 / z-res. • Similar FOM implies z-res ~ 5 mm. • Probably impossible. • FOM ~ 3 or z-res ~ 30 mm can be useful and not obviously impossible. Careful studies needed to confirm (or refute) this hand waving! UTOPIA Page 20

  21. Level-1 Track Trigger • See presentation by Nikos Konstantinidis (http://indico.cern.ch/conferenceDisplay.py?confId=59516) • Doublet(s) – direct impact on layout • Regional readout – no direct impact UTOPIA Page 21

  22. Computing Impact • Pattern recognition and reconstruction time driven by combinatorics. • Can a layout make a (large) impact? • Possibilities: • Layer doublets • More pixel layers • What are the costs (in $ as well as physics performance)? UTOPIA Page 22

  23. Summary from UTOPIA • Come up with a basic layout by October • Targeted for Letter of Intent • Upgrade Simulation group doing the hard work! UTOPIA Page 23

More Related