L AGUNA LBNO TE/MSC R OSARIO P RINCIPE 2 O CTOBER 2012 C LEAN R OOM D ESIGN G ENERAL MEETING AT CERN

TE/MSC R OSARIO P RINCIPE 2 O CTOBER 2012 T ABLE OF C ONTENTS C LEAN R OOM D ESIGN  G ENERALIA  M AIN GOAL  T HE AIR FLOW RATE  A IR H ANDLING U NITS  A IR DISTRIBUTION  O PERATING MODE

TE/MSC R OSARIO P RINCIPE 2 O CTOBER 2012 G ENERALIA T HE FEASIBILITY STUDY AIMS TO DEFINE THE MAIN TECHNICAL PARAMETER OF A VENTILATION AND PRESSURIZATION SYSTEM FOR THE LA R L AGUNA TANK  B ASED ON THE 50 K T LA R TANK –D IAMETER 55 m –S URFACE m 2 –H EIGHT 22 m –V OLUME m 3

TE/MSC R OSARIO P RINCIPE 2 O CTOBER 2012 M AIN G OAL P RESSURIZE THE LA R TANK DURING THE DETECTOR ASSEMBLY AND INSTALLATION PHASE.  A IR Q UALITY ISO8 STANDARD BASED ON THE ISO ( CORRESPONDING TO C LASS 100’000 IN FS109),  S TRATEGY : SUPPLY CLEAN AIR UNIFORMLY IN THE LA R TANK

TE/MSC R OSARIO P RINCIPE 2 O CTOBER 2012 A IR F LOW R ATE M AIN CRITERIA  V OLUME : m 3  M AX NUMBER OF PERSONS WORKING IN THE AREA : 15 PP  M AX NUMBER OF PERSONS WELDING : 4 PP O THER ASPECTS  O VERPRESSURE ENSURES AIR QUALITY –D ELTA P: + 15 P A TO 30 P A –F RESH AIR THROUGH H IGH Q UALITY F ILTERS TYPE H14  A NOTHER BASIC PRINCIPLE : D ILUTION –N ORMAL STANDARD FOR NEW AIR = 10 VOLUMES / h » NORMAL CLEAN ROOMS ~1000 m 3 –LA R VOLUME ~ 50’000 m 3 >>> T HEORETICAL F LOW R ATE = 500’000 m 3 /h (!) –W E IMPOSE : »F LOW R ATE = 100’000 m 3 /h (= 2 VOLUMES / h ) »30 P A OVERPRESSURE. »C OMPENSATE GAZ EXTRACTION ( IF ANY, I. E. WELDING ) Welding: 2000 m 3 /h x 4 = 8000 m 3 /h max >>> ok

TE/MSC R OSARIO P RINCIPE 2 O CTOBER 2012 A IR H ANDLING U NITS 2 X A IR H ANDLING U NITS (AHU) = CTA 50  M AX F LOW R ATE = 60’000 m 3 /h  N OMINAL F LOW R ATE = 50’000 m 3 /h  I NSTALLED POWER 37 K W  P RE - FILTERS TYPE G4  P RIMARY FILTERS TYPE F7  A BSOLUTE FILTERS H14  D IMENSIONS 2.2 X 2.6 X 3.9

TE/MSC R OSARIO P RINCIPE 2 O CTOBER 2012 AHU CTA 50

TE/MSC R OSARIO P RINCIPE 2 O CTOBER 2012 A IR D ISTRIBUTION  F OUR MAIN AIR DUCTS D IAM = 1000 –4 L ATERAL OPENINGS FOR THE ACCESS  T HE MAIN DUCTS SUPPLY SMALLER DUCTS –8 X DUCTS DIAM = 800 ( BOTTOM LA R TANK ) –40 X D IFFUSION G RILLES 1000 X 500 ( LOW SPEED )  T HE AIR FILLS THE LA R TANK, THEN EXIT FROM THE TOP ROOF –10 X EXTRACTION GRILLES 1000 X 1000

TE/MSC R OSARIO P RINCIPE 2 O CTOBER 2012 O PERATING MODE  F RESH AIR FROM THE CAVERN (?)  D URING THE FILLING PHASE (D ELTA P < 30 P A ) THE EXTRACTION GRILLES ARE C LOSED  O NCE NOMINAL DP, TWO OPTIONS : 1. O PEN AND REGULATE THE EXTRACTION GRILLES 2. OR R EDUCE THE F AN ROTATION SPEED »I N THIS CASE LOWER F LOW RATE »W HICH MEANS LOWER AIR QUALITY AND LOWER CONSUMPTION..  T HE EQUILIBRIUM BETWEEN THE AIR SPEED AND THE EXTRACTION GRILLE OPENING WILL BE ENSURED BY THE CONTROL SYSTEM ( STANDARD )

TE/MSC R OSARIO P RINCIPE 2 O CTOBER 2012

TE/MSC R OSARIO P RINCIPE 2 O CTOBER 2012

ETH Eidgenössische Technische Hochschule Zürich Swiss federal Institute of Technology Zurich 50 KT – Scintillation Light Readout Franco SERGIAMPIETRI 04 June 2012 Page 12 Courtesy of Franco SERGIAMPIETRI ETHZ

TE/MSC R OSARIO P RINCIPE 2 O CTOBER 2012 C ONCLUSION  O UTSIDE THE LA R TANK –AHU POSITION – ROUTING OF THE A IR D UCTS » ON THE ROOF » IN THE CAVERN  LA R TANK ACCESS ( LATERALLY ) –4 X DUCTS DIAM 1000 –10 X E XTRACTION G RILLES (1000 X 1000)  I NSIDE THE LA R TANK ( FLOOR ) – ROUTING OF THE A IR D UCTS » LYING ON / UNDER THE FLOOR –D IFFUSION G RILLES POSITION