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Drift Presentation

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  • Electronics for the DRIFT Detector

    Kevin KuwataDr. Jean-Luc Gauvreau & Dr. Dan Snowden-Ifft

    July 31, 2013

  • What is Dark Matter?Matter in the Universe

    15%

    85%

    Dark Matter Matter

  • What is Dark Matter?

    Does not interact through electromagnetic radiation

    Does interact with gravity Theory points towards weak force

  • DRIFT

    Carbon disulfide (CS2)

  • DRIFT

    CS2-

    CS2

    Cathode

    Wires

  • Current Design:

    Pre-Amp Shaper DigitizerDetector

    Wire

  • Current Design Cost Pre-Amp: CR110 $155.00

    Shaper: CR200 $ 155.00 Digitizer: $500

    Per Wire Total: $810 per channel

  • Grouping Wires1

    2

    3

    4

    5

    6

    7

    8

    9

    10

    11

    12

    Ch. 1Ch. 2

    Ch. 3

    Ch. 4

    ... ... ... ...

  • Problems:

    Grouping increases capacitance, due to large number of wires hooked up to each channel, which increases the noise to an unacceptable level

    No information about location of event

  • Grouping Wires1

    2

    3

    4

    5

    6

    7

    8

    9

    10

    11

    12

    Ch. 1Ch. 2

    Ch. 3

    Ch. 4

    ... ... ... ...

  • Solution: Multiplex Selection

    Reduce the noise by ungrouping Requires inexpensive electronics

  • Brookhaven National Laboratory (BNL)

    Replaces Pre-Amplifier and Shaper Developed the integrated chip (IC) that

    allows the detector to be sensitive to quantities of charge.

    16 wires per BNL Chip $100 per wire previously, down to $5 per

    wire

  • BNL Board

    InputOutput Output

    BNLControl

  • BNL details

    Gain Peak time AC coupling Test signal

  • Programming the BNL Board: Arduino Control Board

    The BNL board can be programmed by sending a series of pulses

    LabJack initially programming BNL board, now using Arduino Mega2560

  • Multiplexing

    Multiplexing: process of taking selecting one of several signals

    Allows for the individual wire testing

  • Multiplexer

    Output

    Inputs

  • Multiplexer: Address

    The Address of the multiplexer can be thought as a street address of a house

    Output

    Inputs

    S0S1

  • Address Selection

    S0 and S1 determine the address. S0 and S1 are binary (1,0)

    (0,0) (0,1)

    (1,0) (1,1)

    Output

    = 00

    = 11

    = 2

    2

    = 3

    3

  • Address Selection

    (S0, S1)

    (0,0) (0,1)

    (1,0) (1,1)

    2

    1 3

    0

    Output

  • Multiplexing Wires1

    2

    3

    4

    5

    6

    7

    8

    9

    10

    11

    12

    Ch. 1Ch. 2

    ... ... ... ......

    Output

  • Multiplexing Board

    Multiplexing board uses 17, 8-channel multiplexing integrated circuits to select 1 wire out of a 120.

  • Multiplexing Board

  • Multiplexing BoardOutput

    Input

  • Measurements

  • Height MeasurementsMax Height

    Max

    Hei

    ght (

    Volts

    )

    0.00

    0.75

    1.50

    2.25

    3.00

    Channel0.0 12.2 24.4 36.6 48.8 61.0 73.2 85.4 97.6 109.8 122.0

    = 2 % x = 2.46 V .05

  • Height MeasurementsMax Height

    Volta

    ge (V

    )

    2.3500

    2.3875

    2.4250

    2.4625

    2.5000

    Wire 0.0 12.2 24.4 36.6 48.8 61.0 73.2 85.4 97.6 109.8 122.0

  • Width @ 50% Height Measurements

    = 2% x = 2.48 .05 S

    Width

    Wid

    th (

    S)

    0.00

    0.65

    1.30

    1.95

    2.60

    Channel0 12 24 36 48 60 72 84 96 108 120

  • Width @ 50% Height Width

    Wid

    th (

    S)

    2.38

    2.43

    2.49

    2.54

    2.60

    Channel0 12 24 36 48 60 72 84 96 108 120

  • Noise Measurements

    noise 3500 electrons, grouping noise bnl 600 electrons 600 electrons noise after Multiplexer

    Board

    Boards & Detector Total noise: 750 electron

    ~1 trillion (10^12) electrons in static shock

    electrons involved in a

    static discharge

  • Supplementary Slides

  • Supplementary Slide: Address Selection

    S0 and S1 determine the address. S0 and S1can be either On (1) or Off (0).

    (0,0) (0,1)

    (1,0) (1,1)

    0 1

    0

    1

    Output

    = 00

    = 11

    = 2

    2

    = 3

    3

  • Supplementary Slide: Address Selection

    S0 and S1 determine the address. S0 and S1can be either On (1) or Off (0).

    (0,0) (0,1)

    (1,0) (1,1)

    0 1

    0

    1

    2

    1 3

    0

    Output

  • Supplementary Slide: Address Selection

    S0 and S1 determine the address. S0 and S1can be either On (1) or Off (0).

    (0,0) (0,1)

    (1,0) (1,1)

    0 1

    0

    1

    2

    1 3

    0

    Output

  • Supplementary Slide:

  • BNL Monitoring

    Arduino monitors Status line of the BNL Notifies user of a possible error in the

    BNL parameters

    Automatically resets BNL boards if they become un-programmed

  • BNL Monitoring

    Is the Status OK?

    No yes

    Reset

    > 1.0 Resets/Minute?

    No yesTurn On Indicator

    Light

  • Multiplexing Wires

    Ch. 1

    19

    17Ch. 2

    21018

    Ch. 3

    81624

    Multiplexers (Mux)

  • In-Field Programming

    Ability to change settings away from computer

    no technical programming required