Web DCS Ecogas Jan Eysermans Benemrita Universidad Autnoma

Web. DCS Ecogas Jan Eysermans Benemérita Universidad Autónoma de Puebla ECO-GAS Meeting January 24 1

Web. DCS - Overview Web-based detector control system, to be used within GIF++ infrastructure - Developed originally for CMS RPC GIF++ studies (R&D and longevity) - Hosted on a DELL machine in GIF++ rack area - User friendly and flexible: relatively easy implement new features - Automatic scans (e. g. each night) and fast analysis of results (DQM) implemented Access Web. DCS ecogas: - Inside CERN: - Outside CERN: lxplus. cern. ch webdcsecogas. cern. ch (username: webdcs, password: ******) Tunnelling: ssh -l <nice-login> -L 2080: webdcsecogas. cern. ch: 80 Browser: http: //localhost: 2080 General guidelines: - To not overload the CAEN telnet, try to use as much as possible the Web. DCS for set/monitoring detectors (telnet connections can be saturated) - Ssh access to the machine possible for automatic analysis, display plots on dedicated pages, etc. 2

Web. DCS - Main features DIP parameter archivation - Storage of all necessary DIP parameters (P, T, RH, gas, source, attenuator, …) Archived every minute on a dedicated machine in database (Maria. DB) Monitoring history page provided in Web. DCS page → need to check the availability of ECO-gas mixing parameters with gas group (except gas box 101) Detector management - Easy to add chambers and gaps and their properties Main properties: area, nominal working point and standby voltage For gaps: specifying the CAEN slot/channel → all detectors already implemented in Web. DCS, but need to specify WP/STBY Pressure-Temperature correction - Automatic pressure/temperature correction Can be disabled globally, sensors can be changed (settings → PT correction) → need to converge on common PT correction formula 3

Web. DCS - High-Voltage scan Current HVscan: measure the current for given sequence of HV points Input parameters: - #HV points Effective voltage for each chamber/gap (double vs. single gap) → PT corrected applied voltage will be applied to the channels Waiting time: time after ramping stable to start measuring the currents Measuring time: total measuring time per HV point Measure interval: sampling frequency Auxiliary info: comment box / scan label Template ID: a template based on a previous scan be used Output → all scans collected in Run Registry (labeling can make it easier…) - Histograms for each channel per point with monitored values (imon, veff, vapp) Automatic plots of imon vs. HV for default templates possible Download button to save all ROOT files to disc DAQ Integration: - HVscan synchronized with TDC DAQ Possible to synchronize with other DAQ systems, provided easy start-pause-stop interfacing 4

Web. DCS - Stability run Principle is run based: - Typically run duration of one week (from access to access day) Measure and archive imon, veff, vapp each 10 seconds in database (Maria. DB) Online plot tools available to plot all parameters in time Keeps track of attenuation value (upstream) Input and run configuration (per detector/gap): - Working operating voltage (nominal voltage) Standby voltage (safe voltage, Ohmic) i 0 protection value (u. A) Attenuator standby: safety mechanism implemented to go to STANDBY if certain attenuation is exceeded Enabled/disabled state: on disabling the detector is powered OFF → input parameters can be changed on the fly during the run: full flexibility → PT correction automatically applied (but can be disabled) Three run modes: - Nominal running: all detectors at defined working point - STANDBY mode: all detectors go to their STANDBY value (can be automatized for certain periods, e. g. 2 hours per night) - HVSCAN mode: let the HV float (i. e. do not change the V 0 Set), such that an HVscan be performed or 5 the user can change the HV through telnet (but all parameters are still kept recorded!)

To discuss… - PT-correction - Chamber conditioning → first time power ON - DIP parameters of ECO gas mixture - Automatic scans: - Detailed HVscan with source OFF on Wednesdays - Other scans with source ON? - Going to STBY during night to measure Ohmic? - For stability runs, more info per run needed? E. g. gas flows per detector, other info? This can be recorded in the database - Other implementations in Web. DCS as requests from other users… ? 6