1 line
6.1 KiB
HTML
1 line
6.1 KiB
HTML
<h2><a name="Variables">TASMAD Variables</a></h2>
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<pre>
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Variables are divided into five groups:
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(i) parameters which define some aspect of the instrument configuration
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but are not directly related to a motor angle or power supply value.
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These variables are changed by the SET command.
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(ii) parameters which relate to the sample.These are also changed by
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SET.
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(iii) limits and zeroes for motors and power supplies, also changed by
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SET.
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(iv) Variables which are explicitly or implicitly related to a motor
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position or power supply value. These variables are changed by the
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DRive command.
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(v) Increments (steps) for the variables of type (iv); these are changed
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by SET.
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The following list gives the variable identifiers and definitions,
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where the order is as the variables are stored in THE Program.
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P.A Variables : Variables marked with an asterisk are not recognized
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unless THE Program is run in polarization analysis mode(see SWitch).
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</pre>
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<h3><a name="Instrument_variables">Instrument variables</a></h3>
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<pre>
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DM Monochromator d-spacing [<5B>].
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DA Analyzer d-spacing [<5B>].
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SM Scattering sense at Mono (+ve to the left)
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SS Scattering sense at Sample (+ve to the left)
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SA Scattering sense at Analyzer (+ve to the left)
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ALF1 Horizontal collimation before mono [minutes FwHm]
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ALF2 Horizontal collimation mono to sample [minutes FwHm]
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ALF3 Horizontal collimation sample to anal. [minutes FwHm]
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ALF4 Horizontal collimation before detector [minutes FwHm]
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BET1 Vertical collimation before mono [minutes FwHm]
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BET2 Vertical collimation mono to sample [minutes FwHm]
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BET3 Vertical collimation sample to analyzer [minutes FwHm]
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BET4 Vertical collimation before detector [minutes FwHm]
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ETAM Monochromator mosaic [minutes FwHm]
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ETAA Analyzer mosaic [minutes FwHm]
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FX =1 for constant Ki; =2 for constant Kf
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NP Number of points in a scan
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TI Preset time [seconds] for a COunt or SCan
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MN Preset monitor for a COunt or SCan
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TO Time-out in for WAit command [minutes]
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DTL lower temperature error allowed [Kelvin]
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DTU upper temperature error allowed [Kelvin]
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*IF1V IF1V and IF2V are currents [Amps] in the vertical-field
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*IF2V coils for Flipper 1 and Flipper 2.
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*IF1H Horizontal-field currents are KI*IF1H for Flipper1 and
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*IF2H KF*IF2H for F2.
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*HELM Angle between axis of Helmholtz pair one and KI.
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remark: ALF1 to ETAA are not used by MAD Program but stored for your own
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convenience.
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Please DO NOT FORGET to update ALF1-ALF4 variable after collimator
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change to avoid confusion when you analyse your data after one or
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two years!
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</pre>
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<h3><a name="Sample_variables">Sample variables</a></h3>
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<pre>
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AS -\
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BS +-- Sample unit-cell edges [<5B>]
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CS -/
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AA -\
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BB +-- Sample unit-cell angles [degrees]
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CC -/
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ETAS Sample mosaic [minutes FwHm]
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AX -\
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AY +-- Components of a recip. lattice vector in scattering plane
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AZ -/ of the sample. A3 is the angle between KI and (AX,AY,AZ).
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BX -\
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BY +-- Components of a second distinct recip. lattice vector in
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BZ -/ the sample's scattering plane.
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</pre>
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<h3><a name="Limits_and_Zeros">Limits and Zeros</a></h3>
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<pre>
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Lower and upper limits and zeros for all variables given in (iv)
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below. L, U and Z are appended as a prefix to the variable names to
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indicate Lower limit, Upper limit and Zero.
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Storage order is the same as for the corresponding variables, i.e. :
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LA1, UA1, ZA1, LA2, UA2, ZA2, LA3 ...
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(see (iv) below).
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</pre>
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<h3><a name="Targets_and_Positions">Targets and Positions</a></h3>
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<pre>
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A1 Monochromator angle (Bragg angle in degrees)
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A2 Scattering angle at mono. (twice Bragg angle in degrees)
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A3 Sample angle (degs) (A3=0 when (AX,AY,AZ) is along KI)
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A4 Scattering angle at sample [degrees]
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A5 Analyzer angle (Bragg angle in deg, TOPSI: not used)
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A6 Scattering angle at analyzer (twice A5 in deg., TOPSI: not used)
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SINQ Instruments:
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MCV Mono curvature vertical
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SRS Sample table second ring
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ACH Anal curvature horizontal
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MTL Mono lower translation
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MTU Mono upper translation
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STL Sample lower translation
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STU Sample upper translation
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ATL Anal lower translation
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ATU Anal upper translation
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MGL Mono lower goniometer (Reserved)
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MGU Mono upper goniometer
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SGL Sample lower goniometer
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SGU Sample upper goniometer
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AGL Anal lower goniometer (Reserved)
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AGU Anal upper goniometer
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MSC Mono "sample" changer (TASP only)
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ASC Anal "sample" changer (TASP only)
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CSC Collimator "sample" changer (TASP only)
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D1T D1B D1R D1L Diaphragm 1 (top/bottom/right/left)
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D2T D2B D2R D2L Diaphragm 2 (top/bottom/right/left)
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D3T D3B D3R D3L Diaphragm 3 (top/bottom/right/left)
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ILL Instruments:
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CH Monochromator changer position [degrees or mm]
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TM (LM) Monochromator translation [(IN20 : 5mm)]
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GM Monochromator goniometer angle [1 unit = 4¡]
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RM Monochromator curvature
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GL Sample goniometer angle; lower arc [1 unit = 4¡]
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GU Sample goniometer angle; upper arc [1 unit = 4¡]
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TA Analyzer translation [ ? mm]
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GA Analyzer goniometer angle [ .4degrees]
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RA Analyzer curvature
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EI Incident neutron energy [THz or meV]
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KI Incident neutron wavevector [ <20>-1]
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EF Final neutron energy [THz or meV]
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KF Final neutron wavevector [ <20>-1]
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QH -\
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QK +-- Components of Q in Reciprocal Lattice Units [R.L.U.]
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QL -/
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EN Energy transfer; +ve neutron energy loss [THz or meV]
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QM Length of Q [ <20>-1]
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TT (T) Temperature of sample thermometer [K]
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TRT(RT) Temperature of regulation thermometer [K]
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(can only be printed out)
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*I1 -\
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*I2 \
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*I3 +-- power supply current values [A]
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. /
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*I11 -/
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*HX -\ Components of Helmholtz fields at sample in Oersteds.
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*HY +-- HX is parallel to Q and HY is perpendicular to Q in
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*HZ -/ the scattering plane.
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*F1 -\ Status of flippers one and two; these variables take the
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*F2 -/ values ON or OFF.
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</pre>
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<h3><a name="Increments_Variables">Increments Variables</a></h3>
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<pre>
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For all variables A1 through T in the list of type (iv) variables
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above, the identifier for the step used with a SCan command is obtained
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by prefixing the variable name with the letter D.
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Storage order is DA1, DA2, DA3....etc as for type (iv) variables above.
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</pre>
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