Jochen Kaminski

A GEM-TPC prototype with low-noise highly integrated front-end electronics for linear collider studies

Connected to the linear collider project, studies on the readout of time projection chambers (TPCs) based on the gas electron multiplier (GEM) are ongoing. Higher granularity and intrinsically suppressed ion feedback are the major advantages of this technology. After a short discussion of these issues, we present the design of a small and very flexible TPC prototype, whose cylindrical drift volume can be equipped with endcaps of different gas detector types. An endcap with multi-GEM readout is currently set up and successfully operated with a low-noise highly integrated front-end electronics. We discuss results of measurements with this system in high intensity particle beams at CERN, where 99.3 /spl plusmn/ 0.2 % single-pad-row efficiency could be achieved at an effective gain of 2.5 /spl times/ 10/sup 3/ only, and spatial resolutions down to 63 /spl plusmn/ 3 /spl mu/m could be demonstrated. Finally, these results are extrapolated to the high magnetic field in a linear collider TPC.

A Time Projection Chamber with triple GEM and pixel readout

A Time Projection Chamber with a maximum drift distance of 26 cm was equipped with a triple GEM and a high resolution pixel readout. This detector was set up in a cosmic ray test-stand and 40 000 tracks have been recorded. It was shown, that the transverse spatial resolution in dependence on the drift distance was close to the diffusion limit of single electrons. In an electron test beam with an energy of 0.5 GeV it could be demonstrated that the data show no significant dependence on the track inclination within the pad plane.

An InGrid based Low Energy X-ray Detector for the CAST Experiment

An X-ray detector based on the combination of an integrated Micromegas stage with a pixel chip has been built in order to be installed at the CERN Axion Solar Telescope. Due to its high granularity and spatial resolution this detector allows for a topological background suppression along with a detection threshold below

Operation of a GEM-TPC with pixel readout

1\,\text{keV}

Time projection chamber with triple GEM and pixel readout

. Tests at the CAST Detector Lab show the detectors ability to detect X-ray photons down to an energy as low as

InGrid: Pixelated Micromegas detectors for a Pixel-TPC

277\,\text{eV}

Gaseous detectors with micropattern gas amplification stages and CMOS pixel chip readout

. The first background data taken after the installation at the CAST experiment underline the detectors performance with an average background rate of

Micropattern Gas Detectors

5\times10^{-5}\,/\text{keV}/\text{cm}^2/\text{s}

Performance of a GridPix detector based on the Timepix3 chip

between 2 and

Tracking detectors for future Linear Colliders

10\,\text{keV}