david seckel, icetop status, mons, oct. 22, 2003 icetop: py2 bartol res. inst. @ univ. delaware:...
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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
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
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
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
David Seckel, IceTop Status, Mons, Oct. 22, 2003
Tank Design
• Top Down Design
• Tank construction at Winchester
• Degas system
• Liner
David Seckel, IceTop Status, Mons, Oct. 22, 2003
Shootout at POW
Top-down tank Bottom-up tank (with two rows of insulation remaining)
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
David Seckel, IceTop Status, Mons, Oct. 22, 2003
Winchester Cathedral ♫
David Seckel, IceTop Status, Mons, Oct. 22, 2003
A trip to Leadville
David Seckel, IceTop Status, Mons, Oct. 22, 2003
Data acquisition
Temp
P (ballast)
DO in
DO out
IceTop TestDAQ
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 H2O permeability: purge system
Old (8 channels) New (1 & 2 channels)
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 TiO2
– UV not so good
• MgO – UV ok
• SiO2
– UV similar to MgO
– Easier to use with polyethelene.300 400 500 600 700
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
PE + MgO PE + TiO
2
To
tal D
R
Wavelength (nm)
300 400 500 600 7000.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Polyethylene Tyvek (uncoated) Tyvek (coated)
Diff
use
refle
ctan
ce
Wavelength (nm)
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
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)
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
David Seckel, IceTop Status, Mons, Oct. 22, 2003
Positioning IceTop test tanks
David Seckel, IceTop Status, Mons, Oct. 22, 2003
Freeze model (UD version)
10 20 30 40 50 60timeday0
20
40
60
80
100
120
ecihtpedmc• 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
0 10 20 30 40 50 60timeday
20
40
60
80
100
120
ecihtpedmc
0 10 20 30 40 50 60timeday
20
40
60
80
100
120
ecihtpedmc
0 10 20 30 40 50 60timeday
20
40
60
80
100
120
ecihtpedmc
Pp = 0, 60 W
David Seckel, IceTop Status, Mons, Oct. 22, 2003
Freeze in (Bit-7 version)
Property UD BIT-7
Air-ice interface 20 W/m2/K 4-6 W/m2/K
Water Fully mixed Enhanced Diffusion
Pump 0-60 W 0-60W
Sidewalls/Bottom Estimated Calculated
• FEA analysis
• Air/Ice: no wind**
• Water: enhanced diffusion
• 50 days (< 50 cm ice)
• No pump: 40 days
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)
• 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
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)
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)
David Seckel, IceTop Status, Mons, Oct. 22, 2003
SP tanks
2000: 1 m2 2001: 3.6 m2
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?
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
David Seckel, IceTop Status, Mons, Oct. 22, 2003
IEC muon calibration study
3. Side vertical July 07, 2003Pos-3
20.5”
20.5”
12.5”
36”
Waterlevel
4. 2 scintillators on top July 07-10, 2003Pos-4
11.5”
Pos-4
Pos-3
David Seckel, IceTop Status, Mons, Oct. 22, 2003
UWRF
Contact J. Eisch for Details
David Seckel, IceTop Status, Mons, Oct. 22, 2003
DAQ
• Design & tasks
• Development plans
• Lab set up– DOM thermal tests
David Seckel, IceTop Status, Mons, Oct. 22, 2003
IceTop DAQ components
IceTopData
Handler
IceTopData
Handler
HG Chan
LG Chan.
Tank 1
LG Chan
HG Chan
Tank 2
Station 1
Station 2
Station 80
DOM Hubs (10)
IceTopData
Handler(SP)
Vert. Sh. Trigger
.
.
.
.
GlobalTrigger
InIceDATA
InIceTrig.Gen.
On line
Hor. Sh. Trigger
CommonEvent Builder
DAQControl
MonitoringDOMs (320)
100 kB/s
32 MB/s
10 Hz
Test, Design & Firmware
Design & Coding
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)
David Seckel, IceTop Status, Mons, Oct. 22, 2003
DOM thermal study
X.Bai, D.Swarnkar
BB. Ins. Water
B1 W1 10.5
B2 W1 13.0
B1 W2 11.3
~ 2.75 W
We were hoping for 25 –Need thermal modificationinternal insulation/heater ?
Needs to be> - 40
David Seckel, IceTop Status, Mons, Oct. 22, 2003
Heater for IceTop?
To use the configuration of test 3With 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/
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)
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
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
David Seckel, IceTop Status, Mons, Oct. 22, 2003
SSIII: WaveForms
• For– Response to events
– FPGA design
• Need – DOM SPE data
– Tank model
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
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