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    User name A. Nathan

    Log entry time 12:52:12 on January26,2002

    Entry number 80878

    keyword=target ladder

    The following information was provided by Dave Meekins:

    The current Hall A target stack configuration is shown in the following
    table

    Target Gas or material Cell Length (or target thickness) Radiator
    thickness (g/cm^2)* Average Front Window thickness** Average Back
    Window thickness**
    Loop 1 Top Cell He 4 cm 0 0.142 +/- 0.003 mm 0.150 +/- 0.003 mm
    Loop 1 Bottom Cell He 4 cm 0 0.116 +/- 0.003 mm 0.150 +/- 0.003 mm
    Loop 2 Top Cell He Leaks (vacuum) 15 cm 0 0.128 +/- 0.003 mm 0.127 +/-
    0.003 mm
    Loop 2 Bottom Cell He Leaks (vacuum) 15 cm 0.8001 +/- 0.0005 0.114 +/-
    0.003 mm 0.140 +/- 0.003 mm
    Loop 3 Top Cell H2 15 cm 0 0.127 +/- 0.003 mm 0.132 +/- 0.003 mm
    Loop 3 Bottom Cell H2 15 cm 0.8110 +/- 0.0005 0.130 +/- 0.003 mm 0.140
    +/- 0.003 mm
    Optics tgt C (pyrolitic graphite) See Below 0 NA NA
    15 cm Dummy Al 6061-T6 15 cm 0 0.26994 +/- 0.0005 g/cm^2 0.27146 +/-
    0.0005 g/cm^2
    4 cm Dummy Al 6061-T6 4 cm 0 0.27035 +/- 0.0005 g/cm^2 0.27173 +/-
    0.0005 g/cm^2
    Blank NA NA NA NA NA
    BeO Viewer BeO (99.99% pure) 0.3692 g/cm^2 0 NA NA
    Empty NA NA NA NA NA

    *The radiator material is 99.996% (Cu63 69.09%)+(Cu65 30.91%)
    ** the cell material is Al 7075 T6 for each of the loops and Al 6061 T6
    for the dummy targets

    Optics target Foil Thicknesses (foil 1 is most upstream foil, foil 9 is
    most downstream foil)

    1) 50.94 +/- 0.7 mg/cm^2
    2) 51.19
    3) 51.59
    4) 50.72
    5) 49.38
    6) 50.22
    7) 51.59
    8) 53.08
    9) 49.03