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IceTop: PY2

IceTop: PY2. Bartol Res. Inst. @ Univ. Delaware: Xinhua Bai, John Clem, Paul Evenson, Tom Gaisser , Andrew McDermott, Peter Niessen, James Roth, David Seckel , Len Shulman, Todor Stanev, Stoyan Stoyanov, Divya Swarnkar, Serap Tilav Univ. Wisconsin @ River Falls:

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IceTop: PY2

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  1. IceTop: PY2 Bartol Res. Inst. @ Univ. Delaware: Xinhua Bai, John Clem, Paul Evenson, Tom Gaisser, Andrew McDermott, Peter Niessen, James Roth, David Seckel, Len Shulman, Todor Stanev, Stoyan Stoyanov, Divya Swarnkar, Serap Tilav Univ. Wisconsin @ River Falls: Jonathan Eisch,Jim Madsen, Glenn Spiczak Chiba University: Shigeru Yoshida

  2. Activity for Project Year 2 • PDR (7/15/03) • Tank development • Field season plans • Test stations • DAQ • Simulations • Other • Summary

  3. Review of IceTop Design (ItDD) • Goals • Calibration • Veto & Tag • Cosmic Ray Science • Cover surface above IceCube with air-shower detectors • Water Cerenkov tanks (Auger) • Build on in-ice engineering

  4. Requirements (7/15 PDR) • IceTop (overall plan to achieve science goals) • Station • Tanks • Construction • Liner • Water • DOMs • Cables • Deployment Support Equip. • Logistics • Deployment sequence (feedback to design issues) • Freezing equipment • Freeze monitoring • Counting house • DOM Hubs • Compute platforms for DAQ • Network Infrastructure • DAQ • FPGA Firmware • DOM app/DOM Hub • Post Hub (data handlers/triggers) • Integration • Test & development facilities

  5. Tank Design • Top Down Design • Tank construction at Winchester • Degas system • Liner

  6. Shootout at POW Top-down tank Bottom-up tank (with two rows of insulation remaining)

  7. And the winner is… • Top down. (Bottom up is still a backup plan) • Comparable engineering difficulties • TD more mature & better studied • Limited resources • Modifications from POW • In tank, cheaper, more efficient degasser • Sunscreen • Thinner side insulation • Rigid cover (notshown) • Rigid heated relief tube

  8. Winchester Cathedral ♫

  9. A trip to Leadville

  10. Data acquisition P (ballast) IceTop TestDAQ Temp DO in DO out

  11. Degasser performance New (1 & 2 channels) Old (8 channels) • Similar efficiency at larger flow rate • 25 cc/s vs 0.75 cc/s per channel • Much cheaper! • Some H2O permeability: purge system

  12. Search for Moby Tank • Tyvek has good optical properties but… • Inconvenient to install • Uncertain fiducial volume • Wrinkles • Oreo tank with TiO2 • UV not so good • MgO • UV ok • SiO2 • UV similar to MgO • Easier to use with polyethelene.

  13. Season plans • Logistics/Deployment • Engineering tests • Tank freezing time • Ice quality • Functional TestDAQ • DOM MB temperature • Seasonal thermal changes in tank • Data goals • In situ operation • Muon calibration • Shower spectrum

  14. South Pole 2003-2004 • IceTop tank deployment • James Roth (Nov 10-Dec 10), Andrew McDermott (Nov 10-Dec 10), Tom Gaisser (Nov 10-Dec 10) • IceTop freeze monitoring • Shiguru  Yoshida (Dec 10-Dec 31), Jonathan Eisch (Dec 20-Jan 6)     • IceCube TestDAQ deployment  • John Kelly (Dec 29-Jan 20) , Albrecht Karle (?), Serap Tilav (Jan 12-Feb 12) • IceTop Close Out  • Paul Evenson (Jan 6-Jan 21), Serap Tilav (Jan 12-Feb 12)

  15. IceTop season plan (all dates approximate) • Shipping • Assemble equipment (Nov 10-16) • Deployment (Nov 17-23) • Mark tank location at SPASE • Excavation • Deliver tanks & equipment to site • Install sun-shield (temporary cover during freezing) • Lay out cables • Connect freezing equipment • Install DOMs (physical – not logical) • Fill with water • Survey (Tanks and SPASE stations) (Nov 24-30 or earlier) • Monitor freezing (Nov 23 – Dec 30 (40 day nominal) • Manage excess water • Install DAQ (Dec 29-Jan 20) • Close Tanks (Jan 12-26) • Insulate top of ice • Remove sun-shield; install plywood cover • Cover for dark operation of PMTs

  16. Positioning IceTop test tanks

  17. Freeze model (UD version) • 2 zone model for POW freeze • Modified for Pole • Nominal 40 day freeze • Parameter study Ta = -20, -40 K ca = 5, 25 W / m2 K Pp = 0, 60 W

  18. Freeze in (Bit-7 version) • FEA analysis • Air/Ice: no wind** • Water: enhanced diffusion • 50 days (< 50 cm ice) • No pump: 40 days

  19. TestDAQ components • 4 DOMs (Rev-2 EXPA-1) • Local (http://www.ssec.wisc.edu/~kitamura/icetop.htm) • DOM Hub (Rack + DOR card) • Cables • Quads • Coincidence cables • Connectors • Test DAQ (software/firmware) • not production IceTop DAQ • Non-icecube components • Muon telescope (SPASE modules) • Common Clock

  20. Data Goals • Install TestDAQ (U Wisc) • Installation by UW • Exercise TestDAQ • Operate DOMs • Pedestal • SPE • Set operational mode for IceTop data taking • Test Muon Calibration • Purpose: technique for full-up calibration • Additional Hardware • Muon telescope (SPASE scintillator modules) • Need coincidence between two DAQs • Shower spectrum • Offline analyis with SPASE • Test coincidence between tanks (may need revised FPGA app)

  21. Operating Tank Facilities • South Pole • 2000, 2001 test tanks (Ice) (OMs) • 2003 IceTop test station (DOMs) • UD (housed at IEC) • Presently one tank (OM) • Plans for full station (2) (DOMs) • UWRF • 1 tank (OM  DOM)

  22. SP tanks 2000: 1 m2 2001: 3.6 m2

  23. IEC Test Facility • Initial – White poly tank • 5/28 Fill • 5/30 1 PE waveforms • 5/30-6/9 Muon runs w/telescope • 6/17-20 More muon runs w/tele • 6/20-7/2 Install tyvek liner • 7/2 Fill • 7/3-7 Muon runs w/tele • 7/7-10 Muon calibration study wo/telescope • 8/5 Open tank for inspection • Stand down for other priorities • 10/15 Restart operations • 11/1 Second Tank (Tyvek) • ?/?/04 4 DOMs + Hub?

  24. Muon telescope runs Summary • White PE underperforms wrt Tyvek • Path length dominates • Paths “close” to PMT have shoulder in charge/peak distributions • Response degrades slowly over time (~1% / week) • Need full up simulation to understand details • Need to study surface properties in lab Contact Bai for Details

  25. 4. 2 scintillators on top July 07-10, 2003 Pos-4 3. Side vertical July 07, 2003 Pos-3 20.5” 12.5” Water level 36” 11.5” 20.5” IEC muon calibration study Pos-3 Pos-4

  26. UWRF Contact J. Eisch for Details

  27. DAQ • Design & tasks • Development plans • Lab set up • DOM thermal tests

  28. Common Event Builder IceTop DAQ components Monitoring DAQ Control DOMs (320) LG Chan. Tank 1 HG Chan InIce Trig.Gen. Vert. Sh. Trigger Station 1 DOM Hubs (10) HG Chan 10 Hz Hor. Sh. Trigger Tank 2 LG Chan IceTop Data Handler IceTop Data Handler IceTop Data Handler (SP) Design & Coding Station 2 Global Trigger Test, Design & Firmware 32 MB/s . . . . 100 kB/s Station 80 On line InIce DATA

  29. Development plans • Tasks • Evaluate DOM(s) (Bai/Swarnkar/Seckel) • FPGA algorithms (Seckel) • FPGA design/implementation (Evenson) • IDH/Trigger design (Seckel/Swarnkar) • IDH/Trigger implementation (Swarnkar) • Facilities • Development Lab • DOM/DOM Hub (Need EPXA-4 DOM) • Light Source • Alterra Workstation • Test station • Two tanks IEC (Need 4 DOMs, DOM Hub, Cables)

  30. DOM thermal study ~ 2.75 W We were hoping for 25 – Need thermal modification internal insulation/heater ? Needs to be > - 40 X.Bai, D.Swarnkar

  31. Heater for IceTop? To use the configuration of test 3 With a linear exploration • Month Weather no-more If +1.2 Watts if +2.5Watts (monthly*) (nice try for 0304?) • January -27C -15.7C -12C -7.4C • February -45 • March -56 • April -55 • May -56 • June -59 • July -60C -48.7C -45C -40.4C • August -60 • September -59 • October -47 • November -31 • December -27 *) The monthly average surface temperature at the Pole is from http://www.tki.org.nz/r/socialscience/curriculum/SSOL/on_ice/

  32. Simulations • IceTop questions (Clem & Niessen) • Tank design • Spacing/orientation of tanks at station • DOM placement • Tank details (water depth/ • Refinement of feature extraction, coincidence, triggering etc.. • Facilities • Lab/SP/IEC/UWRF • Compute clusters at UD (16 + 8 + 4 + 16) • Simulation contributions • Event generator: Air shower expertise (Team Bartol, Niessen) • IceTop tank response (“tanktonics”) (Clem & Niessen) • IceTop signal acquistion – FPGA (Seckel, Swarner) • DAQ operation – buffer and triggers (Seckel, Swarner)

  33. Sim sim Gamma Component in a 10TeV Proton Shower at 10.6kft. Units are in cm and GeV • For • Particle input into tanksims • Estimates of response to physcis events • Needs • Air Shower Models • Corsika • Geant/Fluka • Tank/Array Layout Response Sampling

  34. SSII: Tank response • For • Response to events • Tank design parameters • Input to DOM response • Needs • Sim Shower • Tank & DOM optical properties

  35. SSIII: WaveForms • For • Response to events • FPGA design • Need • DOM SPE data • Tank model

  36. Other tasks Need to Integrate IceTop into • Data Handling • Reconstruction • Filtering • IceTop triggered events • In-Ice trigger with IceTop “tag” • Analysis • IceTop data types • Science • Calibration • IceTop/InIce calibration

  37. Summary • IceTop Design Review • Tanks • Main design (3rd iteration) • Under study: Liner, Parameters (location of DOMs, separation of tanks) • 03/04 Season Deployment • Complete IceTop station w/TestDAQ • Verify data expectations, calibration strategy • DAQ development • Some lingering HW issues • FPGA design • /IDH/triggers at • Simulation Development • Facilities: Lab, SP, UD, UWRF • Local design sims • Integration into IceCube simulation • Other • Data Handling, Reconstruction & Filtering, Analysis, Calibration

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