1. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 Activity for Project Year 2 PDR (7/15/03) Tank development Field season plans Test stations DAQ Simulations Other Summary

3. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 Tank Design Top Down Design Tank construction at Winchester Degas system Liner

6. David Seckel, IceTop Status, Mons, Oct. 22, 2003 Shootout at POW Top-down tankBottom-up tank (with two rows of insulation remaining)

7. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 Winchester Cathedral ♫

9. David Seckel, IceTop Status, Mons, Oct. 22, 2003 A trip to Leadville

10. David Seckel, IceTop Status, Mons, Oct. 22, 2003 Data acquisition Temp P (ballast) DO in DO out IceTop TestDAQ

11. David Seckel, IceTop Status, Mons, Oct. 22, 2003 Degasser performance Similar efficiency at larger flow rate –25 cc/s vs 0.75 cc/s per channel Much cheaper! Some H 2 O permeability: purge system Old (8 channels) New (1 & 2 channels)

12. David Seckel, IceTop Status, Mons, Oct. 22, 2003 Search for Moby Tank Tyvek has good optical properties but… –Inconvenient to install –Uncertain fiducial volume –Wrinkles Oreo tank with TiO 2 –UV not so good MgO –UV ok SiO 2 –UV similar to MgO –Easier to use with polyethelene.

13. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 Positioning IceTop test tanks

17. David Seckel, IceTop Status, Mons, Oct. 22, 2003 Freeze model (UD version) 2 zone model for POW freeze Modified for Pole Nominal 40 day freeze Parameter study T a = -20, -40 Kc a = 5, 25 W / m 2 KP p = 0, 60 W

18. David Seckel, IceTop Status, Mons, Oct. 22, 2003 Freeze in (Bit-7 version) PropertyUDBIT-7 Air-ice interface20 W/m 2 /K4-6 W/m 2 /K WaterFully mixedEnhanced Diffusion Pump0-60 W Sidewalls/BottomEstimatedCalculated FEA analysis Air/Ice: no wind ** Water: enhanced diffusion 50 days (< 50 cm ice) No pump: 40 days

19. David Seckel, IceTop Status, Mons, Oct. 22, 2003 TestDAQ components 4 DOMs (Rev-2 EXPA-1) –Local (http://www.ssec.wisc.edu/~kitamura/icetop.htm)Local 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 SP tanks 2000: 1 m 2 2001: 3.6 m 2

23. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 IEC muon calibration study 3. Side vertical July 07, 2003 Pos-3 20.5” 12.5” 36” Water level 4. 2 scintillators on top July 07-10, 2003 Pos-4 11.5” Pos-4 Pos-3

26. David Seckel, IceTop Status, Mons, Oct. 22, 2003 UWRF Contact J. Eisch for Details

27. David Seckel, IceTop Status, Mons, Oct. 22, 2003 DAQ Design & tasks Development plans Lab set up –DOM thermal tests

28. David Seckel, IceTop Status, Mons, Oct. 22, 2003 IceTop DAQ components IceTop Data Handler IceTop Data Handler HG Chan LG Chan. Tank 1 LG Chan HG Chan Tank 2 Station 1 Station 2 Station 80 DOM Hubs (10) IceTop Data Handler (SP) Vert. Sh. Trigger........ Global Trigger InIce DATA InIce Trig.Gen. On line Hor. Sh. Trigger Common Event Builder DAQ Control Monitoring DOMs (320) 100 kB/s 32 MB/s 10 Hz Test, Design & Firmware Design & Coding

29. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 DOM thermal study X.Bai, D.Swarnkar BB. Ins.Water  B1W110.5 B2W113.0 B1W211.3 ~ 2.75 W We were hoping for 25 – Need thermal modification internal insulation/heater ? Needs to be > - 40

31. David Seckel, IceTop Status, Mons, Oct. 22, 2003 Heater for IceTop? To use the configuration of test 3 With a linear exploration MonthWeatherno-moreIf +1.2 Wattsif +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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 Sim sim For –Particle input into tanksims –Estimates of response to physcis events Needs –Air Shower Models Corsika Geant/Fluka –Tank/Array Layout Gamma Component in a 10TeV Proton Shower at 10.6kft. Units are in cm and GeV Sampling Response

34. David Seckel, IceTop Status, Mons, Oct. 22, 2003 SSII: Tank response For –Response to events –Tank design parameters –Input to DOM response Needs –Sim Shower –Tank & DOM optical properties

35. David Seckel, IceTop Status, Mons, Oct. 22, 2003 SSIII: WaveForms For –Response to events –FPGA design Need –DOM SPE data –Tank model

36. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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. David Seckel, IceTop Status, Mons, Oct. 22, 2003 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