Progress against Plans

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Progress against Plans

• Plans
• DOM prototype technical design
• Prototype design of components
• Components for 20 prototype DOMs
• PMT selection
• Cable design
• Requirements documents of above mentioned
  components

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Progress against Plans
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Progress against Plans

• Review of Technical Progress
• DOM prototype technical design
• Good progress, a baseline prototype design has
  been established. For some subsystems final
  design is contingent on testresults
• PMT selection done
• Prototype design of components mostly completed
• Cable design prototype ordered, to be tested
• Requirements documents of above mentioned
  components well advanced. Requirements documents
  for major components have been iterated in
  conference calls and internal reviews.

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Schedule

• Schedule is closely synchronized with DAQ
  schedule (DOM main board is integral part of the
  OM)
• Areas of attention
• HV system, design choice
• Flasherboard
• System dark noise rate

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Budget vs Cost
Total expenses (incl. encumbered) thru 2/28/03
889k
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Personnel (In-Ice)

• Staffing has been behind anticipated schedule
  Progress has been made in the last few months,
  however.
• This was not without effect on anticipated budget
  and schedule in some areas.
• UW 5 engineers, 2 scientists, 1 prod. engineer
  for In-Ice, 1 L3, (was below 5 until very
  recently)
• UCB 1 scientist
• Germany 2, Sweden 1 (will increase while test
  facilities are being constructed)

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Project Year 2 - Deliverables

• 20 prototype Digital Optical Modules.
• Test report on prototype DOMs
• Revised Engineering Requirements
• 150 Pre-Production DOMs
• Final Production DOM design documentation.
• Parts list for procurement of material
• Production Readiness Review Findings

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Project Year 2 - Milestones

• m/dd/yy
• 5/31/03 In-Ice Perliminary Design Review
• 8/31/03 In-Ice Critical Design Review
• 10/31/03 Complete 150 Pre-production modules
• 11/30/03 Purchase Orders for production DOM long
  lead items
• 1/31/03 In-Ice production readiness review
• 3/31/04 Start production of DOMs for 04/05 season
• -----------
• PY 3
• 7/5/04 Ship first 150 DOM
• 9/10/04 Ship last DOM (of 500)

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PY 2 - Schedule element
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Project Year 2 - Budget elements

• Contributions by collaboration
• In-Ice Devices total 5,800k
• IceCube- PY2 Proposal 3,550k
• European contribution (cap.) 2,220k
• Foreign labor contribution are not specified, but
  will be significant, too.

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Project Year 2 - Budget elements

• In-Ice Devices total 5,800k
• Cap equipment 3,810
• Cables 1,050
• PMT 816
• Base 292
• Flasher 350
• Glass Vessels 544
• Cable assemblies, connectors 360
• Production facilities (PSL) 200
• Capital equipment costs for major components
  appear in rather good agreement with the budget
  presented at the last major NSF Review (Hartill
  II)

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In-Ice Devices mostly DOMs and Cables
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String design Surface cable and In-ice cable
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Review of Technical Progress

• In-Ice Devices
• Status and progress on DOM
• DOM technical design
• PMT
• HV
• Flasher Board
• Connector
• Pressure housing, Gel, Mu-metal grid
• Other string hardware
• Cable systems
• Mechanical components
• Special devices

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OM Mechanical Design Issues as of August 02

• (Slide from IceCube technology meeting
  presentation, August 02, D. Wahl)
• Position of PMT inside sphere
• Prefer 13mm of gel below PMT
• Must have room for HV base at top
• Mu-metal shield design
• Must function magnetically, but be out of the way
• Main board and flasher board spacing
• Manometer -- mechanical or electronic?
• HV board
• ISEG or other?
• Newest ISEG pcb must be redesigned
• How close PMT to glass? How much gel?
• Mechanical tolerances in sphere and PMT
• Delay cable
• Cable routing and attachment

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Glass instrument housing

• Requirement
• Spherical
• Diameter no larger than 13
• Pressure 10000 psi
• Size constraint by system requirement on drill
  hole diameter.
• Low noise (single photoelectron noise induced at
  PMT by radioactivity in the glass housing or
  other mechanisms)
• High transmittance (Desirable UV cut-off close
  to 300 nm, possibly be below)

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Design studies
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Design studies
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Design studies m-metal grid
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Design studies
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Result

• Detailed mechanical requirements, documented in
  engineering requirements documents (ERD) for
  DOMMB, Flasherboard, HV generator and other
  components.

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Assembled DOM
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PMT selection and testing

• Will be presented in following session in detail
  by Kael Hanson.
• Possible Choices
• Photonis
• Hamamatsu
• 8 inch
• 11 inch
• 10 inch three flavors
• Selected R7081-02 (10, 10-stage, 1E08 gain)

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PMT Mechanical constraints
11 inch PMT too large and bad match of sphere
radius
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70 nsec Delay board
Advantages compared to delay cable less
weight, facilitate production process.
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Delay board
Average PMT pulse and delayed pulse. (Amplitudes
in a.u.) Rise time 2.6/3.0 nsec FWHM 6.4/7.7
nsec Temperature dependance insignificant.
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Mount of electronics
Ease of integration pre-assemble
major electronics boards see sample
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Flasherboard

• Lead Engineer Dan Wahl, PSL
• Purpose
• Interstring calibration
• Geometry and timing verification
• Ice properties verification and fine tuning (dust
  layers, hole-ice structure)
• In-situ linearity calibration
• Local coincidence testing
• Need more light output than in string 18 version
  due to larger string spacing of IceCube.

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Flasher Overview
NSF Review March 25-27, 2003 UWMadison
Click to edit Master text styles Second
level Third level Fourth level Fifth level
Each DOM contains a Flasher Module Flasherboard
is not in the signal path it is anticipated to
be powered up less than 1e-4 of the operating
time. Challenges High Intensity Short Optical
Pulse. Pulse to pulse timing accuracy. Character
ization over temperature. Power
management. Concept (6) Light emitters 60º
apart. 2 LED(s) per emitter. Mounted above
and, Controlled by DOM Main Board.
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Flasher Overview
NSF Review March 25-27, 2003 UWMadison
Click to edit Master text styles Second
level Third level Fourth level Fifth level

• Design Goals
• 370-420nm wavelength.
• 5x109 max photons per pulse.
• 1x103 min photons per pulse.
• FWHM lt15ns pulse width.
• 1khz repetition rate.
• 32 logarithmically ordered settings.
• Output intensity 15 accuracy.
• 5ns Trigger spread across LED(s)

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Example LED Module
Click to edit Master text styles Second
level Third level Fourth level Fifth level
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Flasherboard status
NSF Review March 25-27, 2003 UWMadison
Click to edit Master text styles Second
level Third level Fourth level Fifth level

• Well developed requirements document.
• Pulse Circuit topology study is complete.
• LED module prototype PCB(s) fabricated.
• Flasher Control Board in layout stage.
• Parts ordered for 24 units. (We have parts for
  first 6 units.)
• Next steps
• Integration of 20 systems
• Software API yet to be written.
• Calibration Software yet to be written.
• System Performance Evaluation.

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HV generator

• AMANDA Prototype was used in about 60 OM, most
  of them DOMs on string 18.
• Seen as critical for quality and reliability
• Very well developed Engineering Requirements
  Document
• Developing two design solutions with identical
  interfaces.
• Evaluation and decision after prototype testing
  of 20 OM completed.

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PMT HV Base BoardFunctional Overview (1/2)
N. Kitamura, UW, also K.H. Becker, U. Wuppertal
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PMT HV Base BoardFunctional Overview (2/2)

• Analog functions
• /-5V input, 1000 - 2000V output
• Transformer coupling for PMT pulses
• Digital functions
• Adjustment and monitor of the HV output in 12-bit
  (0.5V) resolution
• Digital readout of unique board serial number

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PMT HV Base BoardDual-Track Strategy

• Two configurations with identical signal
  interface seen by the DOM Main Board
• Single-board configuration
• All functionality on one-board, mounted on PMT
• Passive base configuration
• Resistive bleeder chain analog interface on PMT
• Separate daughter board, carrying the HV
  generator digital interface

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PMT HV Base BoardDual-Track Comparison

• Single Board
• Compact integration
• The 1st dynode voltage is fixed, independent of
  gain adjustment
• HV generator close proximity to PMT

• Passive Base
• Classical approach
• All dynode voltages scale with total A-K voltage
• Potential noise source is away from PMT pins

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PMT HV Base BoardMechanical
HV Generator Board for passive base
configuration
PMT HV Base Board
LED Modules
Flasher Board
DOM Main Board
Delay Board
3D CAD by Glen Gregerson, PSL
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PMT HV Base BoardStatus

• Vendor A in Germany to deliver the PMT base in
  single board configuration
• Vendor B in the US to deliver the HV generator
  for the passive base configuration
• UW-Madison to develop the daughter board for the
  passive base configuration (completed)
• UW-Madison to assemble the daughter board
• Summary
• One of the main challenges is the reliability
  assessment.
• Redundant strategy should allow an optimal choice
  on a realistic time schedule.

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Optical components

• Substantial contributions by collaboration.
• Glass instrument housing
• Optical coupling gel
• PMT
• Requirements
• High transmission for Cherenkov light in
  detectable range from 280 to 600 nm.
• Small contribution to noise rates, design goal
  500 Hz overall.

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Photodetection efficiency
Cherenkov- Spectrum (200-600 nm)
OM Glass
Type Benthos I sphere used for this
estimation Thickness 11-12 mm transmission
probability 30
Coupling Gel
Type RTV 6156 (GE Silicones) Thickness 5 - 20
mm transmission of residual photons 5 mm
97.5 20 mm 90
PMT Glass
PMT Cathode
Type borosilicate glass Thickness
2.7 mm transmission of residual photons
81
Type Bialkali quantum efficiency (QE) 25
Photo-electrons / Cher. photons 6
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Glass instrument housing

• Status Stable and on schedule
• Spheres for 20 DOM are selected and have been
  delivered by Benthos.
• Benthos delivered spheres for AMANDA strings
  5-19.
• Alternative housing by Nautilus/Schott still
  possible.
• Overall performance (and price) favors Benthos,
  which is the default choice.
• However, source of noise still being investigated
  (details in presentation by K.H.)

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Optical coupling Gel

• Status Good and on schedule
• The choice of gel has been discussed in detail
• Presentations by L. Koepke (Mainz) et al.
• Report by P. Sudhoff, DESY
• Report by E. Resconi (DESY/Un.HD)
• Gel is not a critical component regarding
  transmittance its optical transmittance in the
  UV region is large compared to the glass
  components.
• RTV 6156, GE Silicone is adequate choice
• This gel has been used for all AMANDA modules.

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Magnetic shielding
m-metal grid design
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Magnetic shielding

• Status Good, on schedule
• Report by R. Nahnhauer, DESY
• A sufficient shielding can be obtained be the
  type of shield selected.
• The details of the geometry have no significant
  effect on the shielding.
• The vertical field strength can be reduced by ba
  factor of 2.5.
• The efficiency and peak-to-valley ratio improve
  by 10 to 15.

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Cables and connectors

• (Lead engineer A. Laundrie, UW)
• Status cable OK, slightly behind schedule,
  design to be finalized after successful system
  test. (Cable is not in critical path.)
• Critical component, exposed to forces of pressure
  and refreeze.
• The most crucial choice is between quads and
  twisted pairs. Quads are theoretically more
  efficient but electrical performance is less
  reliable.
• Quads have been used successfulyl on string 18.
• Quads are the choice for the prototype cable.
• Tests with a prototype cable of 2500m length and
  multiple OMs will solidify cable requirements and
  allow for design modifications if needed.

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Cables requirements

• Maximum length from OM to HUB 3200 m
• Operating frequency range 200 to 800 kbit based
  on 41 bandwidth for 400 kbps data
• Allowable signal loss 40 dB based on 5-V
  transmission amplitude, 5-mV rms noise at the
  receiver, and 20-dB minimum SNR
• Maximum DC power loss 10

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Cable critical areas

• Cable technology
• impedance control, mismatch can cause ringing
• symmetry of 2 OM per pair
• cross talk between twisted pairs (within a
  twisted quad)

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IceCube cable configuration

• The baseline design uses quads in the main cable.
• Groups of four optical modules (OMs) are
  harnessed together at the factory, deployed as a
  set.
• Each group of four OMs connects to the main cable
  through a four-pin connector.
• Each group of four OMs connects to adjacent
  groups through a pair of two-pin connectors.

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1 Quad 4 DOM

• Optical Module Configuration Breakouts every 68
  mFew main connector 15/string4 OM are hardwired
  together

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Octopus design
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Preliminary Connector selection

• C1 Seacon MINK4CCRL (Mini-Con series)
• C2 Seacon RMK-2-FS w/locking sleeve
• C3 Seacon RMK-2-MP w/locking sleeve
• C1 is 1.12 inch (28 mm) in diameter, stainless
  steel, with 16 gold-plated brass contact pins.
• C2 and C3 are 1.1 inch O.D. Neoprene rubber and
  use 10 and 14 gold-plated copper alloy contact
  pins.
• Show sample
• Seacon provided all connectors for AMANDA

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Penetrator

• Prototype design
• 8 pins
• 1.25 inch flat surface
• 3/4 inch diameter

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DOM Production and Testing

• Presentations tomorrow by
• P. Robl Prodution
• K. Hanson Testing

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Summary

• Major goals have been achieved.
• Technical Design for prototype DOM
• First DOM tests in April 03
• On track to gear up for phase 2 (150 OM
  pre-production) and phase 3, the production of 7
  strings.