1. Nov 30, 2003Tom Gaisser The IceTop component of IceCube Perspective from the South Pole

2. Nov 30, 2003Tom Gaisser Outline Scientific goals Design IceTop sub-group: tasks and staffing Budget & schedule

3. Nov 30, 2003Tom Gaisser IceTop: the surface component of IceCube A 3-dimensional air shower array for – Veto (i.e. tagging downward events) – Calibration – Primary composition from PeV to EeV – Calibration, composition analyses similar to SPASE-AMANDA but 5000 x larger acceptance wider energy range, better resolution IceTop at high altitude (700 g/cm 2 ) –125 m spacing between IceTop stations –E threshold ~ 300 TeV for > 4 stations in coincidence –Useful rate to EeV

4. Nov 30, 2003Tom Gaisser Small showers (2-10 TeV) associated with the dominant  background in the deep detector are detected as 2-tank coincidences at a station. Detection efficiency ~ 5% provides large sample to study this background. Showers triggering 4 stations give ~300 TeV threshold for EAS array Large showers with E ~ 100-1000 PeV will clarify transition from galactic to extra-galactic cosmic rays.

5. Nov 30, 2003Tom Gaisser IceTop station schematic Two Ice Tanks 3.1 m 2 x 1 m deep (a la Haverah, Auger) Coincidence between tanks = potential air shower Signal in single tank = potential muon Significant area for horizontal muons Low Gain/High Gain operation to achieve dynamic range Tank simulation with GEANT-4

6. Nov 30, 2003Tom Gaisser IceTop tasks & activities Design and construct tank detectors –Evenson, Shulman, McDermott, Roth, Stoyan, technician (TBH) Deploy tanks –Gaisser, McDermott, Roth, technician (TBH) Yoshida (Chiba), student (UWRF), RPSC support, Engineer (SSEC) Confirm dynamic range scheme for 2 DOMs –Bai Calibrate detectors –Bai, Stoyan, Gaisser, Clem, Niessen, Spiczak (UWRF) Develop and install DAQ firmware –Evenson, Seckel Integrate DAQ software as part of IceCube –Seckel, Software engineer (TBH), Svarnkar (grad student), Asst Prof (TBH) Simulations –Stanev, Niessen, Gaisser Reconstruction, data handling –Tilav, Post-doc (TBH) Physics analysis –All, including Asst Prof (TBH)

7. Nov 30, 2003Tom Gaisser Staffing plans Current –9 months faculty salary (includes 1 month UWRF) –10 months technical staff –5 months engineer –50 months research scientists/post-doctoral (includes SPASE, which becomes part of IceCube in PY3) –12 months grad student Additional for PY03-PY10 –4 months faculty salary (new Asst Prof) –12 months entry-level technician –12 months software engineer –12 months post-doc for event reconstruction –12 months for second grad student

8. Nov 30, 2003Tom Gaisser Budget IceTop (1.3.2) is an integral part of IceCube IceTop effort focused at Bartol/UD & UWRF –Air showers generate the primary background for IceCube as a neutrino telescope – Bartol/IceTop efforts (e.g. in simulation, DAQ, reconstruction, physics analysis) make substantial contributions to other WBS elements –1.3.2 PY3: UD $1,086K; UWRF $60K; Total $1,146K –Other WBS elements in PY3: UD: $344K Tank construction schedule: –10+32 in PY3 then 32 each in PY4,5,6 then 22 in PY7 –This schedule allows shipping by vessel after PY3

9. Nov 30, 2003Tom Gaisser Outline of Bartol/UD budget PY3 LaborCapitalMaterial & Supplies (includes shipping) 1.2.3.3 Field season ops$38K$20K 1.3.2.1 Tanks (10 + 32) 84$250K 30 1.3.2.2 Cables (local coin only) 22 20 3 1.3.2.3 DOMs (labor only) 28 1.3.2.4 IceTop specific engineering328120 1.3.2.5 Integration of SPASE 90 10 1.3.2.6 Management/office101 1.3.4.5 Test DAQ System 36 1.3.4.6 First deployment DAQ 8 1.4.3.1 Event generation 39 10 1.4.3.3 Detector simulation 33 6 1.5.1 Detector verification 50 1.5.2.1 Reconstruction 78 1.5.3.2 Calibration 26 Totals961296173$1,436K