David Seckel, IceTop Status, Mons, Oct. 22, 2003 IceTop: PY2 Bartol Res. Inst. @ Univ. Delaware:...

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


Activity for Project Year 2

• PDR (7/15/03)

• Tank development

• Field season plans

• Test stations

• DAQ

• Simulations

• Other

• Summary


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


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


Tank Design

• Top Down Design

• Tank construction at Winchester

• Degas system

• Liner


Shootout at POW

Top-down tank Bottom-up tank (with two rows of insulation remaining)


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


Winchester Cathedral ♫


A trip to Leadville


Data acquisition

Temp

P (ballast)

DO in

DO out

IceTop TestDAQ


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)


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)


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


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)


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


Positioning IceTop test tanks


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


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


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


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)


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)


SP tanks

2000: 1 m2 2001: 3.6 m2


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?


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


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


UWRF

Contact J. Eisch for Details


DAQ

• Design & tasks

• Development plans

• Lab set up– DOM thermal tests


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


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)


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


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/


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)


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


SSII: Tank response

• For– Response to events– Tank design parameters– Input to DOM response

• Needs – Sim Shower– Tank & DOM optical

properties


SSIII: WaveForms

• For– Response to events

– FPGA design

• Need – DOM SPE data

– Tank model


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


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

David Seckel, IceTop Status, Mons, Oct. 22, 2003 IceTop: PY2 Bartol Res. Inst. @ Univ. Delaware:...

Documents

Transcript of David Seckel, IceTop Status, Mons, Oct. 22, 2003 IceTop: PY2 Bartol Res. Inst. @ Univ. Delaware:...