News from Cracow on the forward tracking J. Smyrski Jagiellonian University, Cracow, Poland Construction of a prototype straw module Measurement of wire tension in straws Simulations and optimization of the forward tracking x-t relation in non-homogenous magnetic field PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Module: 2x 16 straws printing board for RC elements straws printing boards for positioning and grounding straws gas in out PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

Assembling modules in a detection plane rotation center support frame double layer : vertical wires (0) and (0) or inclined wires (+10) and (-10) PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

One tracking station with four double-layers Two double layers with vertical wires Two double layers with inclined wires e.g. (+10) and (-10) Two double layers with vertical wires PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

Gluing the straws together 1 layer 2 layers pressure 2 bars droplets of glue PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

Transferring the module frame PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

Mounting on the support frame Module on the support frame after removing the transfer frame PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 plans test the procedure of transferring and installing the modules on the support frame measure the positions and deformations of straw (photo-modeler) measurement of high voltage characteristics, determination of the noise level test of reliability of the electrical contacts to straws PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

Device for measuring wire tension Principle of measurement: generation of voltage pulse (30 V, 1 ms) through wire placed in magnetic field measurement of frequency of dumped oscillations by observation of waveform of induced current PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

Measurement of wire tension Minimum field to measure signal frequency: ~0.5 T cm PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

Measurement of wire tension 20 μm Tungsten wire L = 1.10 m  = PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

Simulations of the forward tracking Work of Ola Wronska PandaRoot framework Kalman filter Detection efficiency (~98%) and position resolution (~60μm) based on the results of tests of the Juelich straws Momentum determination using 3 pairs of the forward tracking stations; each station contains 4 double layers of straws Bl = 2 Tm, p(μ) = 1.5 GeV/c DC6 DC5 DC4 DC3 DC2 DC1 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Momentum resolution PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Main objectives Main factor(s) limiting the momentum resolution, Influence of the forward RICH on the tracking, Required inclination of wires, Required position resolution, Required extension of active areas in the x direction. PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Variation of x-t relation in non-uniform magnetic filed of the dipole magnet (calculations with the GARFIELD) track z x straw Gas mixture: 90% Ar + 10% CO2 Gas pressure: 2 bar Sense wire voltage: +1600 V variation of Bx variation of By PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009 Stray field in the tracking stations before and after the dipole magnet Components Bx, By, Bz of stray magnetic field within the active volumes of the tracking stations DC1, DC2, DC5, DC6 are smaller than 0.35 T Variation of x-t relation along one straw and from straw to straw in one detection plane is smaller than 0.05 mm DC 1 2 3 4 5 PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009

Non-uniform magnetic field inside the dipole magnet gap Resulting corrections (of up to ~0.35 mm) to x-t relation can be in principle calculated using GARFIELD and applied as function of x- and z-coordinate for each straw layer PANDA FWD Meeting, GSI-Darmstadt, 3.03.2009