IME Andrea Paoli for the IME Subsystem Infrastructure Modifications for Environmental noise reduction IME Internal Review Proposed infrastructure changes

IME A. PaoliIME Internal Review Slide 2 Subsystem overview Realization of all the hard works to reduce the anthropogenic noise into the experimental buildings Main tasks: replacement/relocation of the HVAC machines improvement of insulation of the air flow distribution systems realization of acoustically isolated rooms Other tasks: reduction of the high reverberation time of the halls (this could become a main task) infrastructural works needed for AdV (modification of electric power systems, basements for LN 2 tanks, support for towers displacement, etc.) Reference doc: “IME Report to IRC – Infrastructure modifications: proposed strategy for noise reduction”

IME A. PaoliIME Internal Review Slide 3 Interactions IME activity proceeds in connection with the noise hunting activity of V+ Commissioning It shall interact with the other subsystems to obtain specifications for the realization of the infrastructures (e.g. INJ for max level of noise in the LL, DET for max level of noise in the central hall, SAT for the thermal stability of the hall, etc.) It will work in parallel with DAQ and VAC to realize the needed modifications and upgrades of the infrastructures

IME A. PaoliIME Internal Review Slide 4 Noise hunting activities so far V/V+ Commissioning has identified the most relevant noise-inducing machines and is proceeding in the understanding of the relevant coupling mechanisms Summary of the mitigation works performed/planned so far: nr.itemdatenotes 1 Acoustic enclosures in LLSep 2006Factor 2 to 5 noise reduction above 100 Hz. 2 Acoustic enclosure for DLApr 2007 Factor 2 noise reduction at 50 Hz, 4 to 15 from 100 Hz to 1 kHz. 3 Acoustic enclosures for NEB optical benchMay 2007 Factor 2 noise reduction at 50 Hz, 4 to 15 from 100 Hz to 1 kHz. 4 Acoustic enclosures for WEB optical benchMay 2007 Factor 2 noise reduction at 50 Hz, 4 to 15 from 100 Hz to 1 kHz. 5 Installation of rubber bellow in the cold water pipeline to mitigate CB pump 1 noise Dec 2007Not much effective. 6 Installation of acoustic panels on the DAQ windowsJan 2008 Acoustic noise transmitted to Central hall reduced by a factor2 above 100 Hz. 7 Relocation of the DAQ HVAC machineFeb-Mar 2008 Reduction of noise transmitted to Central hall in the Hz band. 8 Realization of the EE Room (acoustic separating wall, door and cooling system) to host LL electronic racks Jul 2008; Feb 2009Acoustic isolation of EE Room respect to LL benches is a factor ≈100 at 100 Hz, ≈ 1000 at 1 kHz.

IME A. PaoliIME Internal Review Slide 5 Noise hunting activities so far /2 nr.itemdatenotes 9 Modification of the CB HVAC machine air flow, reduction of fans speed by 25% Sep-Oct 2008 Factor 2 reduction of acoustic and seismic noise below ≈ 40 Hz. 10 Improvement works on the CB electrical systems distribution (work not directly for environmental noise mitigation) Jun-Oct 2008Electromagnetic noise gains to be measured 11 Mitigation of electromagnetic noise due to inductance loops in the fluorescent lighting of the CB mechanical lab Jul 2008 Noise detected and eliminated by re-cabling of the circuits. 12 Electromagnetic noise coming from the MC HVAC resistive heating Jul 2008 Noise detected. The cure needs the installation of alternative system. 13 Electromagnetic noise coming from the fluorescent lighting of the EE Room Feb2009 Noise detected and eliminated by substitution of the equipments. 14 Improvements on separating walls in the end technical buildings TBDIt would be useful to perform before VSR2. 15 Separation of the LL HVAC system from the CR’s oneReduced intervention scheduled on Apr Installation of dampers for electric motors and fans of the CB HVAC machine Scheduled on Apr Modification works of the cold water pipeline to eliminate CB pump 1 TBDIt would be useful to perform before VSR2. 18Reduction of the NEB HVAC machine air flowTBD Unlikely to perform, due to the improvements already achieved at NE with mirror change. 19Reduction of the WEB HVAC machine air flowTBDIt would be useful to perform before VSR2. All the details are reported in Irene’s docs “Environmental noises during V and V+ Commissioning” and “Infrastructure works for mitigation of environmental noises during V and V+ Commissioning”

IME A. PaoliIME Internal Review Slide 6 Proposed solutions A preliminary project of the mitigation works has been carried out, defining both a reference solution and possible alternatives Here are reported some drawings and the summary of the preliminary cost evaluations The works have been divided into 6 macro categories (HVAC machine relocation, IMMS implementation, HVAC air distribution, Electronics/vacuum pumps relocation, Halls acoustic damping, Support works to the other Subsystems) according to the planning and the IME-WBS As general approach, we observe that part of the proposed works is required not only for noise mitigation, but also for extraordinary maintenance: in same cases they represent an improvement of the performances and reliability of the systems (e.g. substitution of obsolete equipments of 15 years 24/24h running time) as well as an improvement of their working conditions (e.g. relocation of machines in more adequate locations, with proper service spaces and easily accessible) For an easier analysis and comparison, the works have been specified for each experimental building

IME A. PaoliIME Internal Review Slide 7 Reference solution Central Building Perspective view of the Central Area Plan View of the CB – Level New external technical area 2 Central Building 3 Technical Building 4 EE Room (indicative location) 4 1

IME A. PaoliIME Internal Review Slide 8 Reference solution Central Building Cross section of the CB Plan View of the CB – Level New external technical area 2 Vacuum pumps Room (indicative location) 2

IME A. PaoliIME Internal Review Slide 9 Reference solution Mode Cleaner Plan view of the MC Perspective view of the MC 1 New external technical area 2 Mode Cleaner Building EE Room (indicative location)

IME A. PaoliIME Internal Review Slide 10 Reference solution End Buildings Cross section of the WEB Plan View of the WEB Technical room 2 EE Room (indicative location) 2

IME A. PaoliIME Internal Review Slide 11 Reference solution Cost evaluation summary Reference solution nr.itemcategories of works includedcost [k€] 1HVAC machines relocation 1.1Central Building new water pipelines, earthmoving and civil works, old equipments disassembly, waterproofing works, supply and installation of the machines, pipelines and manifolds, new pumps, electric installation Mode Cleaner earthmoving and civil works, equipments relocation, waterproofing works, supply and installation of the machines, pipelines and manifolds, electric installation North End Building civil works, re-installation of the machine, acoustic insulation improvement works West End Building civil works, re-installation of the machine, acoustic insulation improvement works total cost HVAC machines relocation IMMS implementation 2.1Central Buildingelectronics installation, software development Mode Cleanerelectronics installation, software development North End Buildingelectronics installation, software development West End Buildingelectronics installation, software development3.00 total cost IMMS implementation HVAC air distribution 3.1Central Buildingair ducts installation Mode Cleanerair ducts installation North End Buildingair ducts installation West End Buildingair ducts installation30.80 total cost HVAC air distribution Electronics/vacuum pumps relocation 4.1Central Building EE Room, vacuum pumps Room, electric installation Mode Cleaner EE Room, vacuum pumps Room, electric installation, cooling system North End Building EE Room, vacuum pumps Room, electric installation, cooling system West End Building EE Room, vacuum pumps Room, electric installation, cooling system total cost electronics/vacuum pump relocation Halls acoustic damping 5.1Central Buildinginstallation of phono-absorbing materials Mode Cleanerinstallation of phono-absorbing materials North End Buildinginstallation of phono-absorbing materials West End Buildinginstallation of phono-absorbing materials48.00 total cost halls acoustic damping Support works to other Subsystems 6.1Central Building civil works, modifications of electric installations Mode Cleaner modifications of spaces, walls, frames, modification of electric installations North End Building civil works, modifications of electric installations West End Building civil works, modifications of electric installations total cost support works to other SSs IME total cost (taxes excluded)

IME A. PaoliIME Internal Review Slide 12 Alternative solution 1 Cost evaluation summary Alternative solution 1 nr.itemcategories of works includedcost [k€] var. [%] (*) 1HVAC machines relocation 1.1Central Building new water pipelines, civil works, old equipments disassembly, waterproofing works, acoustic insulation improvement works, supply and installation of the machines, pipelines and manifolds, new pumps % 1.2Mode Cleaner earthmoving and civil works, equipments relocation, waterproofing works, supply and installation of the machines, pipelines and manifolds, electric installation North End Building civil works, re-installation of the machine, acoustic insulation improvement works West End Building civil works, re-installation of the machine, acoustic insulation improvement works total cost HVAC machines relocation % 2IMMS implementation 2.1Central Buildingelectronics installation, software development Mode Cleanerelectronics installation, software development North End Buildingelectronics installation, software development West End Buildingelectronics installation, software development3.00 total cost IMMS implementation HVAC air distribution 3.1Central Buildingair ducts installation % 3.2Mode Cleanerair ducts installation North End Buildingair ducts installation West End Buildingair ducts installation30.80 total cost HVAC air distribution % 4Electronics/vacuum pumps relocation 4.1Central Building EE Room, vacuum pumps Room, electric installation Mode Cleaner EE Room, vacuum pumps Room, electric installation, cooling system North End Building EE Room, vacuum pumps Room, electric installation, cooling system West End Building EE Room, vacuum pumps Room, electric installation, cooling system total cost electronics/vacuum pump relocation Halls acoustic damping 5.1Central Buildinginstallation of phono-absorbing materials Mode Cleanerinstallation of phono-absorbing materials North End Buildinginstallation of phono-absorbing materials West End Buildinginstallation of phono-absorbing materials48.00 total cost halls acoustic damping Support works to other Subsystems 6.1Central Building civil works, modifications of electric installations Mode Cleaner modifications of spaces, walls, frames, modification of electric installations North End Building civil works, modifications of electric installations West End Building civil works, modifications of electric installations total cost support works to other SSs IME total cost (taxes excluded) % (*) variation with respect to the reference solution

IME A. PaoliIME Internal Review Slide 13 Alternative solution 2 End Buildings Plan View of the WEB New external technical area 2 EE Room/Vacuum pumps Room (indicative location) 1 Cross section of the WEB

IME A. PaoliIME Internal Review Slide 14 Alternative solution 2 Cost evaluation summary Alternative solution 2 nr.itemcategories of works included cost [k€] var. [%] (*) 1HVAC machines relocation 1.1Central Building new water pipelines, earthmoving and civil works, old equipments disassembly, waterproofing works, supply and installation of the machines, pipelines and manifolds, new pumps, electric installation Mode Cleaner earthmoving and civil works, equipments relocation, waterproofing works, supply and installation of the machines, pipelines and manifolds, electric installation North End Building earthmoving and civil works, re-installation of the machine % 1.4West End Building earthmoving and civil works, re-installation of the machine % total cost HVAC machines relocation % 2IMMS implementation 2.1Central Buildingelectronics installation, software development Mode Cleanerelectronics installation, software development North End Buildingelectronics installation, software development West End Buildingelectronics installation, software development3.00 total cost IMMS implementation HVAC air distribution 3.1Central Buildingair ducts installation Mode Cleanerair ducts installation North End Buildingair ducts installation % 3.4West End Buildingair ducts installation % total cost HVAC air distribution % 4Electronics/vacuum pumps relocation 4.1Central Building EE Room, vacuum pumps Room, electric installation Mode Cleaner EE Room, vacuum pumps Room, electric installation, cooling system North End Building EE Room, vacuum pumps Room, electric installation, cooling system West End Building EE Room, vacuum pumps Room, electric installation, cooling system total cost electronics/vacuum pump relocation Halls acoustic damping 5.1Central Buildinginstallation of phono-absorbing materials Mode Cleanerinstallation of phono-absorbing materials North End Buildinginstallation of phono-absorbing materials West End Buildinginstallation of phono-absorbing materials48.00 total cost halls acoustic damping Support works to other Subsystems 6.1Central Building civil works, modifications of electric installations Mode Cleaner modifications of spaces, walls, frames, modification of electric installations North End Building civil works, modifications of electric installations West End Building civil works, modifications of electric installations total cost support works to other SSs IME total cost (taxes excluded) % (*) variation with respect to the reference solution

IME A. PaoliIME Internal Review Slide 15 IME Planning

IME A. PaoliIME Internal Review Slide 16 Manpower

IME A. PaoliIME Internal Review Slide 17 Conclusions The interventions of mitigation proposed by IME are based on the studies carried out during V/V+ commissioning and the experience acquired in the past years from the equipments’ operation. Proposed solutions are mainly focused on the modification of HVAC systems and the realization of acoustically isolated rooms to displace the most relevant noise-inducing machines Preliminary evaluations show that the displacement of the HVAC machines out of the buildings does not imply a relevant difference of costs compared with their repositioning in the current location, while leading to significant advantages. Proposed solutions are based on the hypothesis of the optimization of the current systems configuration, with the “classical” solution of displacing the most relevant sources of noise as far as possible. These interventions are strictly correlated to the general strategies that shall be tackled at a superior level of the project (e.g. HVAC mitigation could be obtained reducing as mach as possible the air flow in the halls, but this would require to minimize the inside thermal loads or the thermal stability of the towers).