Ice Top PY 2 Bartol Res Inst

Ice. Top: PY 2 Bartol Res. Inst. @ Univ. Delaware: Xinhua Bai, John Clem, Paul Evenson, Tom Gaisser, Andrew Mc. Dermott, Peter Niessen, James Roth, David Seckel, Len Shulman, Todor Stanev, Stoyanov, Divya Swarnkar, Serap Tilav Univ. Wisconsin @ River Falls: Jonathan Eisch, Jim Madsen, Glenn Spiczak Chiba University: Shigeru Yoshida David Seckel, Ice. Top 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 David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Review of Ice. Top Design (It. DD) • Goals – Calibration – Veto & Tag – Cosmic Ray Science • Cover surface above Ice. Cube with airshower detectors • Water Cerenkov tanks (Auger) • Build on in-ice engineering David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Requirements (7/15 PDR) • Ice. Top (overall plan to achieve science goals) – Station • Tanks – – • – Logistics Deployment sequence (feedback to design issues) Freezing equipment Freeze monitoring Counting house • • • – Cables Deployment Support Equip. • • – Construction Liner Water DOMs DOM Hubs Compute platforms for DAQ Network Infrastructure DAQ • • • FPGA Firmware DOM app/DOM Hub Post Hub (data handlers/triggers) Integration Test & development facilities David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

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

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

Winchester Cathedral ♫ David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

A trip to Leadville David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Data acquisition P (ballast) Ice. Top Test. DAQ Temp DO in DO out David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Degasser performance Old (8 channels) New (1 & 2 channels) • 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 David Seckel, Ice. Top 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 Ti. O 2 – UV not so good • Mg. O – UV ok • Si. O 2 – UV similar to Mg. O – Easier to use with polyethelene. David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Season plans • Logistics/Deployment • Engineering tests – – – Tank freezing time Ice quality Functional Test. DAQ DOM MB temperature Seasonal thermal changes in tank • Data goals – In situ operation – Muon calibration – Shower spectrum David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

South Pole 2003 -2004 • Ice. Top tank deployment – James Roth (Nov 10 -Dec 10), Andrew Mc. Dermott (Nov 10 -Dec 10), Tom Gaisser (Nov 10 -Dec 10) • Ice. Top freeze monitoring – Shiguru Yoshida (Dec 10 -Dec 31), Jonathan Eisch (Dec 20 -Jan 6) • Ice. Cube Test. DAQ deployment – John Kelly (Dec 29 -Jan 20) , Albrecht Karle (? ), Serap Tilav (Jan 12 -Feb 12) • Ice. Top Close Out – Paul Evenson (Jan 6 -Jan 21), Serap Tilav (Jan 12 -Feb 12) David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Ice. Top 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 David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Positioning Ice. Top test tanks David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Freeze model (UD version) • • 2 zone model for POW freeze Modified for Pole Nominal 40 day freeze Parameter study Ta = -20, -40 K David Seckel, Ice. Top Status, Mons, Oct. 22, 2003 ca = 5, 25 W / m 2 K Pp = 0, 60 W

Freeze in (Bit-7 version) • • • FEA analysis Air/Ice: no wind** Water: enhanced diffusion 50 days (< 50 cm ice) No pump: 40 days David Seckel, Ice. Top Status, Mons, Oct. 22, 2003 Property UD BIT-7 Air-ice interface 20 W/m 2/K 4 -6 W/m 2/K Water Fully mixed Enhanced Diffusion Pump 0 -60 W 0 -60 W Sidewalls/Bottom Estimated Calculated

Test. DAQ 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 Ice. Top DAQ • Non-icecube components – Muon telescope (SPASE modules) – Common Clock David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Data Goals • Install Test. DAQ (U Wisc) – Installation by UW • Exercise Test. DAQ – – Operate DOMs Pedestal SPE Set operational mode for Ice. Top 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) David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Operating Tank Facilities • South Pole – 2000, 2001 test tanks (Ice) (OMs) – 2003 Ice. Top test station (DOMs) • UD (housed at IEC) – Presently one tank (OM) – Plans for full station (2) (DOMs) • UWRF – 1 tank (OM DOM) David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

SP tanks 2000: 1 m 2 David Seckel, Ice. Top Status, Mons, Oct. 22, 2003 2001: 3. 6 m 2

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? David Seckel, Ice. Top 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 David Seckel, Ice. Top Status, Mons, Oct. 22, 2003 Contact Bai for Details

IEC muon calibration study 4. 2 scintillators on top July 07 -10, 2003 Pos-4 3. Side vertical July 07, 2003 Pos-3 20. 5” Water level 12. 5” 36” Pos-4 20. 5” David Seckel, Ice. Top Status, Mons, Oct. 22, 2003 11. 5”

UWRF Contact J. Eisch for Details David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

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

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

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) David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

DOM thermal study ~ 2. 75 W BB. Ins. Water DT B 1 W 1 10. 5 B 2 W 1 13. 0 B 1 W 2 11. 3 We were hoping for 25 – Need thermal modification internal insulation/heater ? David Seckel, Ice. Top Status, Mons, Oct. 22, 2003 X. Bai, D. Swarnkar Needs to be > - 40

Heater for Ice. Top? To use the configuration of test 3 With a linear exploration • Month Weather (monthly*) no-more If +1. 2 Watts if +2. 5 Watts (nice try for 0304? ) • • • January February March April May June July August September October November December -27 C -45 -56 -59 -60 C -60 -59 -47 -31 -27 -15. 7 C -12 C -7. 4 C -48. 7 C -45 C -40. 4 C *) The monthly average surface temperature at the Pole is from http: //www. tki. org. nz/r/socialscience/curriculum/SSOL/on_ice/ David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Simulations • Ice. Top 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) Ice. Top tank response (“tanktonics”) (Clem & Niessen) Ice. Top signal acquistion – FPGA (Seckel, Swarner) DAQ operation – buffer and triggers (Seckel, Swarner) David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Sim sim • For – Particle input into tanksims – Estimates of response to physcis events • Gamma Component in a 10 Te. V Proton Shower at 10. 6 kft. Units are in cm and Ge. V Needs – Air Shower Models • Corsika • Geant/Fluka – Tank/Array Layout Response Sampling David Seckel, Ice. Top 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 David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

SSIII: Wave. Forms • For – Response to events – FPGA design • Need – DOM SPE data – Tank model David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Other tasks Need to Integrate Ice. Top into • Data Handling • Reconstruction • Filtering – Ice. Top triggered events – In-Ice trigger with Ice. Top “tag” • Analysis – Ice. Top data types – Science • Calibration – Ice. Top/In. Ice calibration David Seckel, Ice. Top Status, Mons, Oct. 22, 2003

Summary • • Ice. Top Design Review Tanks – Main design (3 rd iteration) – Under study: Liner, Parameters (location of DOMs, separation of tanks) • 03/04 Season Deployment – Complete Ice. Top station w/Test. DAQ – 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 Ice. Cube simulation • Other – Data Handling, Reconstruction & Filtering, Analysis, Calibration David Seckel, Ice. Top Status, Mons, Oct. 22, 2003