Safety Systems for LHC experiments

1. Safety Systems for LHC experiments Baseline specifications – Additional needs – Actions taken Eric Thomas - Safety systems for LHC experiments

2. CSAM • Baseline & Implementation • CSAM is a L3 alarm handling system • Possibility to take actions foreseen in the baseline • Status: Up and running. • Action matrix • Does not trigger any automatic action when receives L3 alarms. • Eventual automatic action to be decided with SC • LHCb may take action to protect equipment through DCS • providing that L3 alarms are published to a DIP server • Needs • LHCb would like to get alarms and warnings (L1,L2) via mobile phone and DIP This feature would be appreciated already during the ongoing installation-commissioning. Most of the L3 could be avoided by a quick fix Eric Thomas - Safety systems for LHC experiments

3. RAMSES • Baseline & Implementation • Radiation/environmental survey, can generate interlocks • Status: Installation • Action Matrix • Generates green/yellow/red warnings if radiation level too high behind the shielding wall (accessible area). • Needs • LHCb would like to have RAMSES validated to interlock the LACS/LASS, to eventually avoid the human intervention of a qualified RP officer to get access. Is it planned? Eric Thomas - Safety systems for LHC experiments

4. LASS/LACS • Baseline & Implementation • Protect against radiation hazards in the experimental area • Status: PM85 equipped, PZ85 equipped in June • Action Matrix • No action on experiment, interacts with machine only: beam dump if access forced. • Needs • Possibility to lock the access and generate interlocks (lock the HCAL • radioactive source in garage position during access or immediately send it back • home if the access is forced ). To be decided with SC • Would like to have in real time list of people in the UX85 (not clear yet • if it will be available in the experiment control room) • Safety Information Display at the top of PZ, to warn about safety • conditions downstairs (radiation level, fire alarm …). This system should not • necessarily be part of the LASS/LACS, but located close to PAD. • + Possibility to broadcast messages from CR to detector. Eric Thomas - Safety systems for LHC experiments

5. SNIFFER • Baseline & Implementation • Smoke detection (no ODH, flammable gas …) - 15 channels • Status: Installed and tested. • Action Matrix • Switch off power of detectors (DSS) • L3 alarms to FB and CCC (CSAM) • Needs • No change required regarding the original specifications. • System should be flexible w.r.t. to changes of configuration • (eg. Number of branches/line), to adapt to ‘as built’ detector needs. Eric Thomas - Safety systems for LHC experiments

6. Fire Detection • Baseline & Implementation • Sniffer system of variable granularity: RB86, RB84, and Ceiling on each side of the shielding wall + barracks • Status: up and running. • CO2 flush system in cavern/barrack racks • Status: ongoing installation. • Action Matrix • No automatic action: FB, CCC (CSAM). • LHCb can only take actions through DCS to protect equipments • (eg fire detected in the barracks, cut of rack power only, not the • ‘service generaux’) • C02/racks : release of C02 and cut power ( action taken by DSS) Eric Thomas - Safety systems for LHC experiments

7. ODH • Baseline & Implementation • Protect against Oxygen Deficiency Hazards in the UX85. • Extension of the tunnel ODH system • Status: Three ODH sensors in the ceiling to protect against He release from AT/ACR equipment in ‘our’ area (system validated by SC, operational) + Two sensors in the Bunker region (confined space below RICH2, 100m3 CF4). • Action Matrix • 1 sensor below 18%: Flash lights, Ventilation set to Maximum, Level3 alarm • 2 sensors below 18%: same + evacuation alarm Eric Thomas - Safety systems for LHC experiments

8. AUG • Baseline & Implemenatation • Status: up and running. • Action Matrix • Power off, Level3 alarm, cavern evacuation alarm • Needs • Improved communication and docs: • LHCb as experienced some unwanted effects in the past (couplings of • surface CAST buildings to UX85, defect switches). Would like to have • a clear scheme of the action matrix (=electrical scheme) and results of • yearly tests. This information is probably exists somewhere on the web Eric Thomas - Safety systems for LHC experiments

9. Conclusions • LHCb is fine with the baseline specifications. • Objective: Complete the installation, get the systems working and keep the • action matrix as diagonal (=simple) as possible. • Some specific issues (use of radioactive source, CSAM actions) will be clarified • in due time with SC on a case by case basis. • Would like to get information via DIP from ALL systems, and if possible • also warnings and analog values, not only L3 alarms • Open issues: • Safety Condition Display around access gate, with CSAM+RAMSES summary (OK/NOT) • Sonorous communication system, from CR to detector area. Eric Thomas - Safety systems for LHC experiments