Speaker
Description
The Compressed Baryonic Matter (CBM) experiment is under construction at the Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany. CBM will investigate matter at highest baryonic densities in collisions of nuclear beams with targets at center of mass energies $\sqrt{s_{NN}}$ = 2.9 - 4.9GeV. Because of the long beam extraction technique employed at the SIS100 synchrotron, CBM´s data collection can be based on streaming time-stamped detector data into a compute farm. Event determination and physics analysis are performed there online, allowing for collision rates up to $10~$MHz.
CBM´s core tracking detector is the Silicon Tracking System, operating in a $1~$Tm dipole magnetic field. Its building block is a module comprising of a double-sided microstrip sensor read out through ultra-thin microcables by self-triggering STS-XYTER ASICs, featuring $4.8~$ns time resolution. The read-out electronics is placed at the periphery of the detector. Gigabit optical links connect to the acquisition system. Up to 10 detector modules are mounted onto a carbon-fiber ladder with 0.3% – 1.5%$~$X$_0$ material budget. The full system comprises 876 modules on 106 ladders forming 8 tracking layers. The system achieves momentum resolution better 2%. The detector mainframe has thermally insulating walls. Due to radiation accumulating to 10$^{14}$ n$_{equiv.~1-MeV}$, runaway of sensor current will be avoided with air cooling down to 0 deg C. The readout and powering electronics, dissipating up to $40~$kW, will be cooled through contact to a cold liquid. The mechanical design of the detector in two independent groups of tracking stations allows for flexibility with replacements or upgrades.
The STS components have been intensively tested, lately in particular in the FAIR phase 0 demonstrator experiment mCBM at SIS18. We overview the detector concept, report on the tests and ongoing series production, and address options for upgrades.
| Collaboration | Compressed Baryonic Matter (CBM) |
|---|---|
| Role of Submitter | I am the presenter |
