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Status Report on Asynchronous Beam Abort Tests at CERN's CMS and ATLAS

This report provides an overview of the one-shot tests conducted at CERN's CMS and ATLAS to simulate the conditions of an asynchronous beam abort. It details the mechanical and signal-driving tests, the status of the modules, and the readout system being developed. The tests included various configurations for high voltage (HV) and low voltage (LV) settings, alongside an assessment of the beam conditions during the 8-hour duration of the tests. The results indicate that the beam setup, mechanics, and signal acquisition are nearly complete, with expectations of timely readiness for future experiments.

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Status Report on Asynchronous Beam Abort Tests at CERN's CMS and ATLAS

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  1. 1-Shot Test Beam CERN CMS: M.Huhtinen, R.Hammarstrom, A.Macpherson CERN ATLAS, PS, Karlsruhe CMS • Overview Simulate conditions of asynchronous beam abort  Consequences to the tracker? • Status Report • beam conditions • tests mechanics signal driving readout Date around PS MD on 16th of October Duration: 8 hours

  2. 3cm 10cm Beam Conditions 102mm2 x 1mm 11C total proton fluence: ~2.6 x 1011 per shot fast extraction: 36.6ns-pulses (separated by 262ns)  best simulation that can be done would be double shot done in same supercycle as slow extraction  1-shot tests in conjuction with other east hall beam tests (!)

  3. Tests 1st carrier: sensor + hybrid 2nd carrier: sensor + good TEC module 3rd carrier: sensor + KA prototype TEC module Testprogramm with last module shots with ... • LV off, HV off • LV on, HV off • LV off, HV on • LV on, HV on (increase risk of damage) • during ~30 consecutive shots: ramp HV (0..100V in 20V-steps and 100..400V in 50V-steps) • module still alive?

  4. Mechanics flexible mounting of module fittings realized with long holes  vertical tilting and horizontal movement of module possible  module‘s position can be adjusted to changing beam positions

  5. Signal Driving • lab tests performed with short pulsed LED signals and minisensors • signal driving over long distances (~30m) with resolution of 1Üs • rise and fall times of leakage current and AC-DC voltage: 2 and 14Üs • time resolution sufficient! Readout 15 parameters in fully populated device carrier • full sized Sensor • Vbias • Ileak • VAC-DC (3 groups) • IDC-biasresistor (3 groups) • Iguard • TEC Module • Vbias • Ileak • V,I125 • V,I250 26+xscope- and 12+yFADC channels avaliable (x,yS0... hopefully!)  at least 2 different sampling times possible (500ns, 10Üs, ...?)

  6. APV readout • APV readout done optically (thanks to Jan Troska) • I2C transfer over ~30m successfully tested • total readout chain is now being setup and tested • readout software has to be done Conclusion • beam setup ok • mechanics ok • signal aquisition and monitoring nearly finished • testing of readout chain in progress • we expect to be ready in time!

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