Can dT CMB /dt be Measured?

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Can dT CMB /dt be Measured?. R. V. Duncan University of New Mexico, and Caltech Quarks to Cosmos Workshop Airlie Center, May 23, 2006 Work sponsored by NASA, and by and equipment loan from Sandia National Labs - PowerPoint PPT Presentation

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  • Can dTCMB/dt be Measured?

    R. V. DuncanUniversity of New Mexico, and Caltech

    Quarks to Cosmos WorkshopAirlie Center, May 23, 2006Work sponsored by NASA, and by and equipment loan from Sandia National Labs

    Acknowledge helpful discussions with Prof. George Seidel (Brown) and Prof. Philip Lubin (UCSB)

  • Why?Fundamental test of cosmological theoriesHubbles Law: v = H DH is very uncertain, 45 90 km/s per MpcT-1 dT/dt ~ D-1 dD/dt = v / D = H, hence a direct measurement of Hubbles Constant. Vastly improved long-baseline stability for all space radiometry applicationsQuasar / Black Hole / etc. radiation variation Anisotropy stability studiesAnticipate dTCMB/dt ~ 200 pK/year

  • An Exceptionally Hard Experiment

    Photon Collection from a faint 2.7 K source:To resolve DT/T ~ 10-11 requires Averaging time ~ one month

    Foreground Sources:Hubble Ultra - Deep Field:SW of Orion in Constellation Fornax,chosen for sparce foreground sources.

    0.05 arc degrees

    Metrology: BB stable to within 100 pK over decades!

  • New Ultra-Stable PlatformC. J. Green, D. A. Sergatskov, and R. V. Duncan, J. Low Temp. Phys. 138, 871 (2005).12

  • 1. Paramagnetic Susceptibility Thermometry

    Magnetic flux is trapped in aniobium tube

    A paramagnetic substance with T > Tc is thermally anchored to the platform M = H c(T)

    c(T) = G [(T Tc)/Tc]-g so small changes in T create large changes in M

    Gifford, Web, Wheatley (1971)Lipa and Chui (1981)

    PdMn: Klemme et al., JLTP 116, 133 (1999) Nelson, Sergatskov, & Duncan, JLTP 127 173 (2002)

    HPd Mn

  • PdMn0.9% Thin Film Magnetic Susceptibility ThermometrySee R.C. Nelson et al., JLTP (2002) For thermometry, See Duncan et al., 2nd Pan Pacific Basin Workshop, 2001.Thin film sensitivity vs. T and HNo hysteresis was observed

    Chart2

    1.36792044.579559610.951859613.3988228

    1.7654045.825833212.96178215.2196408

    2.3958257.53410514.8235316.88292

    3.3574719.87029116.94456118.460476

    4.70566412.87539219.6172820.337408

    7.21060116.62712221.57665521.769673

    11.02674321.14612523.8374523.468354

    3.373.373.373.37

    17.09811225.92294425.61269624.47512

    24.87317730.34877127.35855326.01878

    31.31803232.46166828.78883726.699502

    334.04974529.5147927.0594

    34.3180134.6051929.83800227.684152

    2.82.82.827.99485

    33.3950434.7533730.0157827.13347

    31.59536434.78953629.59419627.51606

    29.81052233.68318829.09002627.198724

    28.09254532.34094528.94222526.97734

    26.26956831.00566828.29030426.080124

    24.407629.486227.28824.7866

    2.32.32.325.9236

    22.33461628.21698426.773965625.000064

    2.22.22.224.81624

    20.971526.38352.124.354

    2.12.12.124.1285

    19.3586423.9878825.5309623.8476

    2225.25042

    1.921.9224.80541.92

    18.2629323.404921.91.9

    1.871.871.871.87

    16.60990963581.831.831.83

    1.822.607641.81.8

    1.71822.19966737191.7181.718

    1.711.711.711.71

    6 G

    35 G

    150 G

    250 G

    Temp (K)

    Sensitivity (flux quanta/mK)

    Sensitivity

    Decreasing Tshiftfield

    Temp (K)12.5 G6 G35 G35 Gauss6 Gauss6 Gauss70 Gauss150 Gauss250 Gauss250 Gauss3.90%6 gauss

    0.403542.23455321.30844564.57955961.3594241.36792047.2219410.951859613.398822813.39882285.80%35 Gauss

    0.36843.92.9733121.74682085.82583321.80257041.7654048.947810812.96178215.219640815.21964084.60%250 Gauss

    0.33333.83.9454652.365247.5341057.4525452.44682.39582511.08196514.8235316.8829216.88292

    0.29823.75.4236073.2002659.8702919.7916883.3462423.35747113.82289916.94456118.46047618.460476

    0.26323.67.6606724.65612.87539212.8008964.70566417.04716819.6172820.33740820.337408

    0.22813.511.0433876.96243516.62712216.7236317.2795367.21060120.47369521.57665521.76967321.769673

    0.19303.410.65764721.14612521.51522111.10363811.02674323.82207123.8374523.46835423.468354

    0.18253.3717.606654

    0.15793.322.1482616.85680825.92294426.1125417.35665217.09811226.93986825.61269624.4751224.47512

    0.12283.227.5721424.34891830.34877129.63034224.62075624.87317729.49442327.35855326.0187826.01878

    0.08773.130.21838230.83418632.46166832.39568931.34002531.31803231.42799728.78883726.69950226.699502

    0.0526333.2229333.59875534.04974534.14996534.50073532.89721529.5147927.059427.0594

    0.01752.935.70152634.26057434.6051934.72006234.69134434.3180133.25544429.83800227.68415227.684152

    2.827.9948527.99485

    -0.01752.836.595928310930.0157834.7533735.0846733.1962633.3950433.2956530.0157827.1334727.13347

    -0.05262.735.027826433830.90265234.78953634.71256831.59536431.59536433.13472429.59419627.5160627.51606

    -0.08772.634.046500360929.58536733.68318833.05275430.21580129.81052232.06207229.09002627.19872427.198724

    -0.12282.531.567946690827.45528532.34094532.34094527.66770528.09254531.2257428.94222526.9773426.97734

    -0.15792.430.572545253825.76438431.00566831.06881626.14327226.26956830.37418828.29030426.08012426.080124

    -0.19302.328.754596784323.649629.486229.410423.87724.407629.334627.28824.786624.7866

    2.325.923625.9236

    -0.22812.226.794275198521.5993228.21698427.75742422.33461622.33461628.4927226.773965625.00006425.000064

    2.224.8162424.81624

    -0.26322.124.66485235219.618526.383526.383520.1822520.971526.834525.3687524.35424.354

    2.124.128524.1285

    -0.2982222.987244470818.5169623.9878825.3906819.3586419.3586426.653225.5309623.847623.8476

    225.2504

    -0.32631.9224.8054

    -0.33331.921.182964890616.8444523.4049223.7595417.73118.2629325.6940921054

    -0.34391.8720.71486263615.52848

    -0.35791.8316.609909635816.6099096358

    -0.36841.822.6076422.60764

    -0.39721.71822.199667371922.1996673719

    -0.40001.7113.54905

    26.0711

    25.36875

    0.0276856369

    25.463

    24.7866

    0.0272889384

    Sensitivity

    000000

    000000

    000000

    000000

    000000

    000000

    000000

    000000

    000000

    000000

    000000

    000000

    000000

    000000

    000000

    000000

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    000000

    000000

    6 G

    12.5 G

    35 G

    70 G

    150 G

    250 G

    Temp (K)

    Sensitivity (flux quanta/mK)

    16219-4.0K

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    H = 35 gauss

    Decreasing T

    Increasing T

    Temp (K)

    Sensitivity (flux quanta/mK)

    Sensitivity of PdMn film

    15219-3.9K

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    Reduced Temperature

    Sensitivity (flux quanta/mK)

    13219-3.8K

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    Reduced Temperature

    Sensitivity (flux quanta/mK)

    Sensitivity of PdMn film

    12219-3.7K

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    0000

    35 G

    70 G

    150 G

    250 G

    Temp (K)

    Sensitivity (flux quanta/mK)

    Sensitivity of PdMn film

    11219-3.6K

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    Decreasing T

    Temp (K)

    Sensitivity (flux quanta/mK)

    150 gauss

    10219-3.5K

    00

    00

    00

    00

    00

    00

    00

    00

    00

    00

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    0

    First pass

    Second pass

    Temp (K)

    Sensitivity (flux quanta/mK)

    250 Gauss

    09219-3.4K

    0-3.102531565.2-3.10253

    2-3.085221565.3-3.08522

    3-3.063331565.5-3.06333

    4-3.046581565.7-3.04658

    5-3.022481565.9-3.02248

    8-2.965991566.3-2.96599

    9-2.932381566.5-2.93238

    10-2.903721566.7-2.90372

    12-2.870671567-2.87067

    13-2.830651567.3-2.83065

    14-2.799071567.5-2.79907

    15-2.759011567.8-2.75901

    17-2.717121568.1-2.71712

    18-2.679811568.3-2.67981

    19-2.635731568.6-2.63573

    20-2.591331569-2.59133Delta V-1570.2

    22-2.548551569.3-2.54855zxzlzuAarccosxcos (I*arccos(x)

    23-2.501361569.6-2.5013615653.1945143419-0.24040317682.25153911384.73437000324.5799781.813577514414.57997814.579978

    24-2.45291569.9-2.452915753.1972805581-0.2381749008-4.6659241.8112825659-0.24040317681.1217029522-0.23817490081.1113059857

    25-2.409691570.2-2.409691.618798-0.8844126252-1.4316853888-0.8865454333-1.4351379743

    27-2.355531570.5-2.35553-0.3571330.6656343861-0.23772000520.660480642-0.2358794331

    28-2.30711570.9-2.30710.0109220.56437138320.00616406420.57192561050.0062465715

    29-2.258751571.2-2.258750.020675-0.9369877329-0.0193722214-0.9329172931-0.019288065

    31-2.211671571.5-2.2116713.3988228-0.0082940.9917331752-0.0082254350.9936664896-0.0082414699

    32-2.1613515