The strip detector of the PANDA MVD

Abstract

PANDA is a key experiment of the future FAIR facility, under construction in Darmstadt, Germany. It will study the collisions between an antiproton beam and a fixed proton or nuclear target. The Micro Vertex Detector (MVD) is the innermost detector of the apparatus and is composed of four concentric barrels and six forward disks, instrumented with silicon hybrid pixel and doublesided silicon microstrip detectors; its main task is the identification of primary and secondary vertices. The main requirements include high spatial and time resolution, trigger-less readout with high rate capability, good radiation tolerance and low material budget. The design of the strip barrel detector and the related recent developments are summarized in this document. Prototypes of double-sided strip sensors were characterized with a probe station and with proton and neutron irradiations. The sensors will be read out with a self-triggering ASIC, employing the Time-over-Threshold technique for energy loss measurement. The sensors and readout chips will be supported by 46 carbon fiber staves, embedding an active cooling system; a flexible multilayer bus will be used to route the signals on the stave towards the DAQ system.

A time-based front-end ASIC for the silicon micro strip sensors of the P̄ANDA Micro Vertex Detector

“…Hence, the pitch and the stereo angles will be different and with 65 µm and 90°, and 45 µm and 15°, respectively [36]. However, the readout pitch will be double with respect to these values.…”

“…The readout is performed with Wavelength Shifting fibres (WLS) coupled to the photomultipliers at the end of the 110 ⇥ 110 mm 2 module [36]. On the bright side, it is a cost-efficient and high-performance solution, but the 1.3.…”

“…The inner diameter of the disks is 22 mm, while the outer diameters are 75 mm and 150 mm, respectively for the first two and the last four disks. Concerning the outer part of the last two forward disks, the inner and outer diameters measure 148 mm and 262 mm, respectively [36].…”

“…The two outer barrels and the outer rim of the last two disks will be covered with double-sided micro strip sensors of three different shapes: rectangular and square for the barrel part and trapezoidal for the disk part. Thus, the pitch and the stereo angles will be different and with 65 µm and 90 • , and 45 µm and 15 • , respectively [5]. However, the readout pitch will be double with respect to these values.…”