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Progress against Plans

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(Slide from IceCube technology meeting presentation, August 02, D. Wahl) ... Lead Engineer: Dan Wahl, PSL. Purpose: Interstring calibration. Geometry and timing ... – PowerPoint PPT presentation

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Title: Progress against Plans


1
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2
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

3
Progress against Plans
4
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.

5
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

6
Budget vs Cost
Total expenses (incl. encumbered) thru 2/28/03
889k
7
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)

8
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

9
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)

10
PY 2 - Schedule element
11
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.

12
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)

13
In-Ice Devices mostly DOMs and Cables
14
String design Surface cable and In-ice cable
15
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

16
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

17
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)

18
Design studies
19
Design studies
20
Design studies m-metal grid
21
Design studies
22
Result
  • Detailed mechanical requirements, documented in
    engineering requirements documents (ERD) for
    DOMMB, Flasherboard, HV generator and other
    components.

23
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24
Assembled DOM
25
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26
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)

27
PMT Mechanical constraints
11 inch PMT too large and bad match of sphere
radius
28
70 nsec Delay board
Advantages compared to delay cable less
weight, facilitate production process.
29
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.
30
Mount of electronics
Ease of integration pre-assemble
major electronics boards see sample
31
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.

32
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 60ยบ
apart. 2 LED(s) per emitter. Mounted above
and, Controlled by DOM Main Board.
33
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)

34
Example LED Module
Click to edit Master text styles Second
level Third level Fourth level Fifth level
35
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.

36
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.

37
PMT HV Base BoardFunctional Overview (1/2)
N. Kitamura, UW, also K.H. Becker, U. Wuppertal
38
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

39
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

40
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

41
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
42
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.

43
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.

44
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
45
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.)

46
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.

47
Magnetic shielding
m-metal grid design
48
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.

49
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.

50
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

51
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)

52
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.

53
1 Quad 4 DOM
  • Optical Module Configuration Breakouts every 68
    mFew main connector 15/string4 OM are hardwired
    together

54
Octopus design
55
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

56
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57
Penetrator
  • Prototype design
  • 8 pins
  • 1.25 inch flat surface
  • 3/4 inch diameter

58
DOM Production and Testing
  • Presentations tomorrow by
  • P. Robl Prodution
  • K. Hanson Testing

59
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.
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