C 3 F 8 detection in N 2 pixel volume environment Rusty Boyd, Martin Doubek, Jan Godlewski Greg Hallewell Sasha Rozanov,Vic Vacek ATLAS ID Sonar Coolant analysis kickoff meeting, CERN, Dec

Not a new idea: C 5 F 12 /N 2 mixed for SLD RICH and analysed by sonar (1988  )

Pixel group wants with an analysis of possible C 3 F 8 leaks into the pixel nitrogen volume. This involves the attachment of one or two temperature-monitored sonar analysis tubes (fabricated at CPPM with transducers installed) at the output of sniffer pipes from the Pixel nitrogen volume made available in USA15, described here 

Development System Driver Logic Analyzer Amp Disc. Off line Analysis Transducer Signal generation, real time analysis, DAQ

- Sonar tube (or 2 tubes*) with pairs of Polaroid 6000 transducers located a known distance apart - To start with: SLAC driver, receiver/discriminator boxes - Thermostatic bath / recirculator circulating ethylene glycol through cooling loop on sonar tube - Readout for temperature and pressure sensors on sonar tube - Logic analyzer to emulate previous SLAC readout system (gated 50 kHz sound pulses, fast transit time clock) - Vacuum pump to evacuate tube, various valves, exhaust bubblers, insulation etc * Possibility of 2 nd tube & active C filter for TRT CO 2 leak study . - Sonar tube (or 2 tubes*) with pairs of Polaroid 6000 transducers located a known distance apart - To start with: SLAC driver, receiver/discriminator boxes - Thermostatic bath / recirculator circulating ethylene glycol through cooling loop on sonar tube - Readout for temperature and pressure sensors on sonar tube - Logic analyzer to emulate previous SLAC readout system (gated 50 kHz sound pulses, fast transit time clock) - Vacuum pump to evacuate tube, various valves, exhaust bubblers, insulation etc * Possibility of 2 nd tube & active C filter for TRT CO 2 leak study . Requirements for C 3 F 8 /N 2 analyzer in USA15

Sniffer tube entry here TRT table Sniffer tube Entry here

Material delivered to Jan Godlewski for this installation: - 56 cm Sonar tube with pair of Polaroid 6000 transducers - 5 pneumatically-actuated sampling valves with OPEN/CLOSE indicators and Honeywell/Skinner K2P3LO actuators (5V 100mA,TTL Open Collector interfaceable) on air manifold - 2 Bubblers for back-to-back anti-syphon installation Other requirements: - Rack - Vacuum pump to evacuate tube - Various hand valves, insulation etc * Possibility of 2 nd tube & active C filter for TRT CO 2 leak study  - Assembly, test, installation manpower - Dedicated computer interfacing to ATLAS network via ethernet. Material delivered to Jan Godlewski for this installation: - 56 cm Sonar tube with pair of Polaroid 6000 transducers - 5 pneumatically-actuated sampling valves with OPEN/CLOSE indicators and Honeywell/Skinner K2P3LO actuators (5V 100mA,TTL Open Collector interfaceable) on air manifold - 2 Bubblers for back-to-back anti-syphon installation Other requirements: - Rack - Vacuum pump to evacuate tube - Various hand valves, insulation etc * Possibility of 2 nd tube & active C filter for TRT CO 2 leak study  - Assembly, test, installation manpower - Dedicated computer interfacing to ATLAS network via ethernet.

* = PT100 Back-to-back Bubblers (anti-syphon) in vented boxes Sampling lines from different tracker envelope regions, entering USA15 from UX15 Active Carbon filter for CO2 removal (replacable or in-situ regenerable) * Thermostatic bath recirculator Jacketed sonar tube 1: C3F8 in N2 Jacketed sonar tube 2: C3F8, CO2 in N2 * * Insulated box Possible monitor for C 3 F 8 & CO 2 ingress into ID volume Suction by extraction to surface or UX15 trough

Sketches of piping for proposed pixel/SCT volume C3F8 in N2 sonar analyzer/sniffer: Left: Phase 1 installation with single tube. Right: second phase with second tube and possible effects sampling of CO2

NIM Crate (5U) Rack for USA15 position Y59—24-A2 : neighbouring rack height ~ 38U (short) 6U panel with pneu- matic valves, actuators, air regulator behind FRONTREAR 98 cm sonar tube (initial) SHELF 56cm sonar tube (1 or 2 later) Active C filter (diim. unknown) 4 U panel: E-LMB, TVC, bias supplies for xducers etc. behind panel LOGIC ANALYZER ON PROJECTING FRONT SHELF Assume 50/50 depthwise split for panel-mounted electronics and vertically-mounted sonar tubes Space for thermo-circulator : choose to fit Valve selection between mixed water & chiller Sonar tube lengths are internal, between flanges: Tubes assumed to be in Individual Armaflex jacketng 56cm sonar tube (1 or 2 later) In addition to sniffer tubes and air extraction, rack requires 8 bar compressed air entry, mixed water entry/exit and selection between M.W. and chiller 56cm sonar tube (1 or 2 later)

Example (1) of Valve Driving and Position sensing reconciliation (CPPM)

Example (2): single Valve Driving and Position sensing reconciliation

Present status: Present status: Sonar should have resolution to do (sub percent  ) C 3 F 8 in N 2 Marzio and Beniamino are prioritizing with Jan for priority to finish the work in USA15 before the end of the year so to have at least a manual readout.