Radiation imaging with optically read out GEM-based detectors

Commissioning of a hybrid readout TPC test set-up and gas gain simulations

“…Optical readout with GEMs has already been demonstrated e.g. by [16]. We plan to group segments of the charge readout together to increasingly larger areas and analyse the performance.…”

Current Status and Future Developments of Micromegas Detectors for Physics and Applications

“…A recent development in Micromegas technology is the optical readout concept. The development follows the work of F. Brunbauer et al, who demonstrated the potential of an optically coupled standard triple GEM with Ar-CF 4 to a sensitive optic camera, obtaining good resolution and fast X-ray projection imaging [33].…”

“…The first tests of this technology were performed using the same setup and cameras as in [33] with an Ar (80%)-CF 4 (20%) gas mixture at atmospheric pressure. Despite the fact that the gain in Micromegas detectors in CF 4 mixtures is relatively poor compared to a double or triple GEM structure, satisfactory images were collected.…”

Commissioning of a High Pressure Time Projection Chamber with Optical Readout

“…TPCs have been in use since the late 1970s, typically with the direct readout of the drifted charge. CCD optical readout of time projection chambers was first demonstrated in ∼1990 by [7][8][9], and it has more recently been developed by the DMTPC project for direction-sensitive dark matter searches [10], by the CYGNO collaboration [11], by an optical TPC for precision nuclear physics cross section measurements [12], for Xray imaging [13], for proton imaging [14], and by the CERN gas detectors group for radiography using X-rays [15]. DMTPC demonstrated that a TPC with optical readout can realize a sub-mm 2 segmentation over a readout plane with an area larger than 1 m 2 [16].…”