RoentDek DLD120, Manual

Page: 47 / 80

MCP Delay Line (Version 6.2.90.5) Page 47 of 80
following computations. If a Hexanode is not used, z1 and
z2 are set to zero. Note that channel 5 and 6 (for
TDC8
)
can still be used for other timing signals. The
corresponding coordinates are the DAQ coordinates for
these TDC channels
These DAN coordinates are called primary because they retrieve the basic information in the DAQ coordinates for a first
data review, assuming a delay-line detector is used. The following secondary DAN coordinates are computed from the
primary coordinates and represent the first step of a (user defined) more elaborated data analysis. If you want to define
additional coordinates you should append them to the secondary DAN coordinates. Here, basically the position in a given
direction (e.g. x = x1 - x2) and the time sums (e.g. sumx = x1 + x2) are calculated from the primary DAN coordinates. Note
that the “unit” of the secondary DAN coordinates is also defined by parameter 100. Additional shift parameters can be
included and coordinate transformation or image rotation codes are provided. For the Hexanode please refer to the add-on
manual.
3.5.3.3 DAN coordinates, secondary, for DLD detectors
x x coordinate of the event (x = x1 – x2)
y y coordinate of the event (y = y1 – y2)
w set to zero
sumx time sum of x (sumx = x1 +x2 + pOSum)
sumy time sum of y (sumy = y1 +y2 + pOSum)
sumw set to zero
sumxyw sum of time sums (sumxyw = sumx + sumy - pOSum)
diffxy difference of sums (diffxy = sumx – sumy + pOSum)
PosX x-position (PosX = x + pOPx)
PosY y-position (PosY = y + pOPy,
If hex flag not set)
(PosY = Yuv,
If hex flag set)
r r coordinate after transformation in r/phi coordinates
(from PosX/PosY)
phi phi coordinate after transformation in r/phi coordinates
(from PosX/PosY)
xRot x-position after rotation
yRot y-position after rotation
The following coordinates are only filled with valid information for the Hexanode
setup. Even though they have to be defined!
Xuv x + pOPx
Yuv 1/sqrt(3) * (x-2y) + pOPy
Xuw Xuv
Yuw 1/sqrt(3) * (2w-x) + pOPy
Xvw (y+w) + pOPx
Yvw 1/sqrt(3) * (w-y) + pOPy
dX Xuv - Xvw
dY Yuv – Yvw
In order to take full advantage of the Hexanode ’s ability to resolve multi-hits or to read-out detectors with a central hole you
may need additional support and software from
RoentDek
. Please contact
RoentDek
as soon as you have the detector
operable and have acquired first data with the
TDC8PCI2-Hex Standard.ccf.
Note, that in order to provide this support it
is required for
RoentDek
to receive a data set acquired with your detector and to know details of the application. Please
look for manual updates on our website http://roentdek.com.
3.5.4 Spectra and conditions
The final purpose of the data acquisition is to display and manipulate the acquired data. For this purpose it is possible to
define
spectra
for display of all defined coordinates. A spectrum is a histogram with fixed bin width either with a one- or two
dimensional array of “slots”. For a one-dimensional spectrum (for example a time spectrum) this array is a row along the
ordinate (X-axis) of a graph, the slots (or bins) correspond to the values of the corresponding coordinate. When data are