CMS MU IB chairs D.Reeder ( M.Cerrada ) P.Managers F.Gasparini G.Mitselmakher I.B. Chairs D.Reeder M.Cerrada R.Manager C.Peroni Tech. Coords H.Reithler R.Loveless Task Coords. G.Iaselli (rpc) T.Rodrigo (alignment) U.Dosselli (DT) C.Willmott (DT El.) A.Korytov (CSC) TY Ling (CSC El.) I.Golutvin (ME1/1) W.Ko (software) G.Wrochna (TRIDAS link) Institution Board Technical Board (Steer.Comm.) BARREL ENDCAPS

Project leader F.Gasparini Tech.Coord. H.Reithler SPO U.Dosselli Planning H.Reithler Safety S.Maselli QA&QC D.Dattola Integration G.Bencze Alignment G.Iaselli RPC Technical Board Tech.coordin. H.Reithler DT chambers U.Dosselli DT electronics C.Willmott RPC G.Iaselli RPC electronics A.Ranieri Alignment T.Rodrigo, G.Bencze TRIDAS link G.Wrochna Software U.Gasparini Integration (detect.) D.Dattola (services) H.Reithler Resource Manager C.Peroni Finance Board M.Cerrada Spain D.Rein Germ. G.Zumerle Italy R.Loveless US V.Karjavin RDMS BARREL muon Drift Tubes Committee H.Reithler M.Cerrada C.Peroni A.Rossi U.Dosselli G.Zumerle C.Willmott

1) MU Identification 2) MU Level 1 Trigger with Threshold up to 100 GeV 3) MU measurement 1) is performed by 4 Muon Stations looking for particles penetrating through the large and segmented return Yoke of the CMS Magnet 2) bunch crossing Identification & fast standalone Pt measurement using precision chambers and fast RPC detectors in each station 3) precision and redundancy : 6 layers CSC in the Endcaps (1000 m2) 8  layers DRIFT TUBES in the Barrel (+4 layers) (1800 m2) fabrizio 15/5/2000

THE BARREL MU long drift time tubes are cheaper than MWPC more sensitive to magnetic field,delta rays and e.m.showers use of cool gas (Ar/CO2),accurate field shaping (4 electrodes), many staggered layers redundancy generates robustness against neutron and e.m. background and allow prompt measurement of time, position and angle of passage of a track for MU trigger design requirement: reconstruction of tridimensional track segments/station within 150 micron in position and 1 mrad uncertainty in the bending plane this translates into: 8 layers in the bending and 4 layers in the non bending projection 300  precision/wire and an adequate lever arm/station.5 to 1 mm chamber positioning for efficient track identification 150 to 400  positioning for precise standalone Pt fabrizio 15/5/2000

Magnetic and radiation environment (Barrel) Magnetic Field highly inhomogeneous can locally reach.8 T perpendicular to the wire plane (MB1).3 T parallel to the wires (ch. borders&corners) neutron <10 4 Hz/cm 2 (MB1 And MB4) (10 10 /cm 2 in 10 years) absorbed dose << 1 Gy /10 years operation in the worst case HIT rate < 10 Hz/cm2 (1 to 10 KHz/wire or RPC channel) collected charge. 5 C/cm of wire (1 hit=4*MIP,100 Hz/cm2,gain 10^5) fabrizio 15/5/2000

BARREL MU INSTITUTES & LABORATORIES Aachen RWTH III A drift chambers Bari Univ.-INFN RPC Beijing IHEP drift chambers Bologna Univ.-INFN drift chambers CERN Mic - CMT drift chambers alignment CIEMAT drift chambers alignment Debrecen K.L.Univ. alignment Islamabad Opt.Lab. alignment Padova Univ.-INFN drift chambers Pavia Univ.-INFN RPC Peking Univ. RPC Santander IFCA-Univ. alignment Sofia INRNE RPC Sofia Univ. RPC Torino Univ.-INFN drift chambers Warsaw SoltanINS RPC Wien HEPHI alignment TECHNICAL COLLABORATIONS Protvino IHEP drift chambers Dubna JINR drift chambers fabrizio 15/5/2000

2000 is a critical year: *volume procurement of raw materials *volume production of parts :mechanical & electrical **setting up of the assembly sites *preproduction of parts for chambers of 2000 *production of first chambers in three (/four) sites in 2000 **setting up of the sites for parts production *begin volume production of parts *design of tools for installation *preparation for the assembly of the Yoke wheels in 00 and 01 *tendering for volume production of TDC and Trigger electronics *2000 is the most expensive year, commitments/payments limited by the funding profile fabrizio 15/5/2000

status : - chamber design is finished - design of tools for chambers finished - design of tools for parts finished - assembly/commissioning of tools is in good progress - first SLayers (MB2) assembled in Madrid with final tools - R&D of trigger electronics still going on - progress in HV and LV supplies - first samples of TDC available in July - radiation test is in progress and planned in view of ESR in Autumn fabrizio 15/5/2000

DT Chambers Production sharing Aachen Madrid Torino Padova Chambers that can’t be installed in SX

HV& decoupl. Boards F-End R-Out & Trigger Honeycomb & integrated C-Beams Mini crates I-Beams plates beam line Pads for RPC suspension RPC and DT are inserted in the yokes as a unique body (constraint in prod. & install. Schedules) 250cm 27cm 200 ~ 400cm THE DT CHAMBERS (Z view) MB1 MB4 fabrizio 15/5/2000

HV& decoupl. Boards F-End I-Beams plates Pads for RPC suspension 250cm 27cm 200 ~ 400 cm Alignment LEDs/holders Suspension “scale” Suspension rails screwed to the yoke THE DT CHAMBERS (X,Y VIEW) MB1 2 3MB4 fabrizio 15/5/2000 Honeycomb & integrated C-Beams

the position of the s equipotential depends on the cell geometry (i.e. on the strip width and on the wire radius) Vw-Vs determines the GAIN in the gas : the request of a gain of ~ 10^5 determines the position of the s equipotential to be ~ 2.5 mm from the wire continuous lines represent electrodes dotted lines represent equipotential surfaces S g C W s fabrizio 28/3/00 the presence of the grounded Al plates and beams between S and C makes the position of the g equipotential quite independent of the Voltages of s and c Vc ( and Vs) must generate in the region between c and g ( and between g and s ) an E field between 1 and 2 KV/cm to saturate the drift velocity a b b/a ~.65

For practical and safety reasons many components are inside the gas volume of the chamber An intensive campaign of measurements to identify possible aging effects from these materials was organized and done ( and will continue,for safety reasons,to check each delivery of materials): - glues on Mylar and Aluminum strips - bare HV,Decoupling and F-End Boards - cables & connectors - fully equipped boards Many components were investigated also after neutron irradiation PROSPERO,Valduc,F) - to look for effects from FR4. - for effects on structural glues (results are published,or submitted, as CMS N.,IN.,scient.papers) fabrizio 28/3/00

AGING & IRRADIATION MEASUREMENTS: In the aging set up in LEGNARO: Aging measurement were performed on Mylar and Aluminium strips to be used for cathode and field shaping electrodes.Strips were tested with and without glue. No aging was detected for >10 LHC years. Pieces of I-Beams and Al.Plates to check for possible effects of cleaning solvents (I-Beams) and of surface treatment (plates). HV and Fend Boards with components&cables) No aging was detected. In the LEGNARO 7 MeV V.d.G. neutrons (6.5 MeV) and thermal n. contr.board+BTI+TSS 20 faults in 10 y of LHC F-End 300 hits in 10 y of LHC In nuclear reactors (Valduc,F. and in Spain) Glued samples and electronics components and boards Prototypes of HV (Caen) and LV (Crisa) supplies 5 * 10 ^ 12 neutrons/cm2 NO DAMAGE In magnetic field prototypes of LV supply up to 1 T POSITIVE With High energy neutrons (>20 MeV) Electronics and supplies will be tested against effects of neutrons up tp 70 MeV in the facility of the UNIVERSITE’ CATHOLIQUE de LOUVAIN in Belgium. Two beams are available with enegry tunable up to 65 MeV: -one with a broad,nearly flat,spectrum with 20 * 20 cm2 cross section,and an intensity of 3.6 * 10^7 n/cm2/sec -a second,”monochromatic” and of few cm2 with intensity of 1.7 * 10^5 n/cm2/sec The first is ideal to test complete boards,the second will be used to verify critical components The first run,with the broad beam,is planned by the end of June 00. fabrizio 15/5/2000

MECHANICAL TESTS: the chamber mockup was proven - to comply with seismic French rules - to be capable of supporting the RPC charge TEST BEAM ACTIVITY: (most significant) one prototype, 3 SL, 3*1 m2, put in GIF in 1987/98 for the equivalent of 6 to 8 LHC years the first MB2s will be put in the GIF this winter coupled to RB2 RPCs the first full chamber (MB96, a MB1 type) was in H2 in 97 and in the GIF,to test rate capability,in summer 98 a “final” SL (Q4) was in the magnet in the H2 beam in 99 (B parallel to the wires) and will be in 00 (B perpendicular) fabrizio 15/5/2000

8 The smallest independent unit is the Super Layer chambers are built by gluing together three or two (MB4) SLs operations for the mechanical assembly of one SL: 9 gluing operations/superlayer 9 w.days /superlayer Workers + 1 Supervisor glue fabrizio 15/5/2000

CHAMBER ASSEMBLY BRICKS plates+strips Torino preprod.+Dubna mass prod. I-Beams+cathodes Bologna preprod+Protvino mass prod. H-Comb+C-beams firm preprod + firm mass prod. HV Boards Padova preprod+IHEP mass prod. F-Ends+Boards firm + minicrates [readout+trigger boards] preproduction allows the construction of few chambers during 2000 ~ 2MB1, 7 MB2, 5 MB3 fabrizio 15/5/2000 Nov. 99

Plans and status assembly site # of tables type of chamber (#) ready in production Aachen 3 MB1 (70) June 2000 Sept Legnaro 3 MB3 (70) MB4 (10) March 2000 May 2000 (Sept.2000) Madrid 3 MB2 (70) Jan.2000 May 2000 (1st MB2 SL: test) Torino 1 MB4 (30) fall 2000 Jan 2001 (Jul.2001) Volume production of plates (Dubna) Sept.2000 Oct (shipment to) Volume production of I-Beams (Protvino) June 2000 Oct (shipment to) HV and Decoupling Boards (IHEP) Dec Volume production of F-Ends Jan March 2000 (1st batch 10^4 June 00) Volume production of F-End Boards Jan March 2000 (150 boards available from previous supplier ( ch)) (tender 4/00) (preserie Sept.00) fabrizio 15/5/2000 Nov. 99

Assembly tools: Precision table for SL (plan.better 50  ) XY plotter (better than 50  ) Glue dispenser CCD camera (better than 20  ) I-Beams holder (better 100  ) Wiring machine Handling tools Ancillary tables for completion,electr.inst.,test Table for ch. Assembly fabrizio 15/5/2000

y z B In the tables for MB1 & 2 the A & B charriots are mech.coupled, for MB3 & 4 the coupl. is electric as in the big milling machines. Two different arrangement are used in To and Pd for the MB4 ch.s: the bridge of the X,Y plotter has different Orientations. Torino uses the same design for the three tables : the two for plates cutting and strips deposition and the one for MB4 assembly MB1 MB2 MB3 & MB4 Padova Torino The I-beams tools for MB1 &2 become two heavy scaling to MB4. They are also different. CCD Camera Glue dispenser A Wires are along Z (PHI tables) Strip deposition fabrizio 15/5/2000 plates saw: (22 types of plate)

BRICKS STATUS: ITEM Mass prod. Preprod. First batch Drift Chambers H-Comb tendering (Jan.2000) ordered (av.June) Nov.00 I-Beams tendering (closing) done I-Beams assembly in Protvino area in preparation progress(Bo) Al Plates tendering (Jan.2000) available Al Plates assembly in Dubna area in preparation mar/april (Jun/Jul-To) HV Boards assembly in IHEP started done F-Ends in order done Jun.00 F-End boards tender in prep. (4/00) Minicrates ordered RPC Bakelite plates tendering (Jan.00) 400 tested Double gaps production tendering (Jan.00) F-End VLSI march 2000 (ESR pending) done /tested fabrizio 15/5/2000 Nov. 99 RPC

PHITHETA MB3 THETA MB2 THETA MB1 ready CIEMAT reday Legnaro ready Bologna /4/00 Bologna /6/00 Bologna TOTAL (~6000 beams produced in Bologna,tested in dry air,4.6 KV,< 1% rejection) 26/6/00 SHIPMENT of the first I-Beam assembly table&tools to Protvino Nov. 00 Protvino 8000 Nov. 00 Bologna Jan. 01 Bologna TOTAL ~ in Bo in Protvino Jan. 01 SHIPMENT to Protvino of the second table and tools, end of production in Bologna. PLAN/STATUS OF I-BEAMS PRODUCTION (10/4/00) status where fabrizio 15/5/2000

The two basic bricks are the ALUMINIUM PLATES and the I-BEAMS Both hold FIELD SHAPING ELECTRODES made of Al 50  tape insulated with Mylar 100 . The ribbons are deposited /inserted on the plates/beams in specialized labs, from which plates and beams are shipped to the assembly sites The expected production capability is 4000 beams and 100 plates in 10 days The need at the nominal overall Super Layer production rate of 10 SL in 10 days is of 2600 beams and 50 plates fabrizio 15/5/2000

The performance of the drift tube is largely insensitive to the positioning of the field shaping strips and of the I-Beams on the plates, and on the position of the wires along the CMS R A tolerance of micron was measured to be fully acceptable More demanding are: A) the wire pitch and staggering in PHI mm ( for trigger purposes) B) the distance between the strip and Mylar along the border sides (for insulation ) mm C) the distance between the strip and Mylar borders at the end of the electrodes (for insul.) mm _ _ _ fabrizio 15/5/2000

A), B) and C) were shown to be under control during the prototype construction. A) wire position : the design of the End plug in two parts makes the position of the wire independent of the the I-Beam position. The crimping block holding the wire sits in the part of the plug that self centers respect to two small plastic guiding pieces precisely glued on the plates in front of the I-Beams ends. B) for strips on the plates : Mylar and Aluminiun strips are put down in the same pass by the same machine,an on-board CCD camera check the borders during the deposition for the strips in the I-Beams: the very precise guidance of the deep I-Beam groove is exploited to ensure the ultimate precision in the strip insertion C) The Aluminium strips are cut with reference to the Aluminium plate or Beam end border (relative floating positioning) fabrizio 15/5/2000

Barrel Mu chambers construction and CMS general schedule A) crew 1,2,3 9 days (glue and wire 3 SL, on tables 1,2,3) B) crew 4 (+1,2,3) 9 days (close&cable 3 SL) in the shadow of A) C) crew 4 (+physists) 9 days (test 3 SL) in the shadow of A) D) crew 1,2,3 3 days (glue 3 SLs, table 4) in the shadow of A) one crew 2 workers + 1 supervisor (total 9 to 12 persons for 4 tables) time for a chamber 9 days (with 4 tables) useful working days 176/year > holidays : Easter,Aug.,Christmas > refurb.,repair etc : 1 day out of 5 12 ~ 14 chambers/wheel must be installed in the UX (Assume 12) sector 1 and 7 2 MB1 (Aa) 2 MB2 (Ma) 2 MB3 (Pd) 2 MB4 (To,Pd) sector 2 and 6 2 MB3 (Pd) 2 MB4 (To,Pd) Install in Sx ch. produced 3 months before the dead line 1 fabrizio 15/5/2000

Construction and Installation schedules draft schedules are based on reasonable assumptions BUT : - the definition of “good” SL - the yield of “good” SLs - the time & efficiency for testing and repair “no good” SLs - the long term reliability and duty cycle of complicated tools - the problems of organization and management of a worldwide spread production of critical parts - the real need and availability of manpower will be known only in one year from now, in spring 2001 fabrizio 28/3/00

A) Time for the full lot of chambers Aachen 70 * 9 (w. d./Ch.) /176 = 3.6 years (mid 04) Madrid 70 * 9 /176 = 3.6 years (mid 04) Padova 80 * 9 /176 = 4.1 years (beg. 05) Torino 30 * 20 /176 = 3.4 (+.5) y. (beg. 05) B) Time for prod. of chambers to be installed in SX last installation window in SX : April 2004 after 3 years of prod. in 3 years : Aa 59 ch., Ma 59 ch., Pd 59 ch., To 22 chambers Chamb./wheel to be installed in SX : 38 out of 50 (12~14 MUST be in UX) THE 38 => 10 MB1 (Aa) + 10 MB2 (Ma) + 8 MB3 (Pd) + 10 MB4 10 MB4 = 2 MB1 (feet,Aa) + 2MB2 (bottom,Ma) + 2 MB3 (top,Pd) + 4 MB4 (To) ch./wheel (5 wheels) Jan.04(Apr. 04) missing (-for full lot) Aachen 12 (60) 59/60 1 (11 MB1) Madrid 12 (60) 59/60 1 (11 MB2) Padova 10 (50) 59/50 1 (11 MB3,10 MB4) Torino 4 (20) 22/20 0 ( 8 MB4) draft CONSTRUCTION draft fabrizio 15/5/2000

draft INSTALLATION draft Chambers are installed in a wheel when the 38 DT and RPC of that wheel are available: constructed+shipped to ISR+tested+measured(Alignm.)+moved to P5 time for installation in a wheel: - services (gas/cooling/cables/balcony electronics) are ready - trigger and R-out electronics sitting on the chambers is installed - installation is : DT/RPC coupling, insertion, test of all connections (photogrammetry not included,MAB cabling partially) time for install.of 38 ch. in SX => 1 Month (half a day/chamber) constraints: availability of electronics / DT RPC schedule fabrizio 15/5/2000

Front ends Readout/Trigger/Control Minicrate DRIFT TUBE CHAMBER Active electronics placement in a BMU Station MAB RPC fabrizio 15/5/2000

1 ROB (Read Out Board) 128 ch. 1 TRB (Trigger Board) 128 ch 4 TDC (any of them can act as Master) 32 BTI,4 TRACO,1 TSServer => precise coordinates =>2 best MU in the Board ONE TS Board houses the TSMaster (two parts,any can act as master) => 2 best MU in the chamber Sector collector board to the counting room in the 4th station in the Minicrates : in each chamber of one CMS sector : 3) electronics: electronics is sitting on the chambers in the gas volume : F-End chips/boards & HV boards 32 F-End chips (2 Boards) feed: fabrizio 15/5/2000

DT POWER REQUIREMENTS: ONE CHAMBER ch. type (#) [sector] minicrates f-ends total (F-End) 3.3 V 5V 2.5V 5V A W A W A W A W W MB1 (60) [all] (20) MB2 (60) [all] (20) MB3 (60) [all] (23) MB4 (30) [1,2,3,5,6,7] (23) MB4 (10) [8,12] (20) MB4 (10) [9,11] (10) MB4 (5) [4left] (20) MB4 (5) [4right] (20) MB4 (5) [10left] (13) MB4 (5) [10right] (13) ALL CHAMBERS : MB1 TOTAL MB2 TOTAL MB3 TOTAL MB4 TOTAL GRAND TOTAL KW A=Amperes W=Watts fabrizio 15/5/2000

This scheme is elegant and cheap but constrains together Electronics and Chambers Production: a) HV Boards and Fend should be available at the time the SUPERLAYER is built to check and commission it before the three Slayers of a CHAMBER are glued together b) Rout and Trigger Boards sit in minicrates inserted in the Hcomb before the chamber is installed fabrizio 15/5/2000

a) the first final protos of Fends will be available by end Nov.99 OK 2000 chips for first ch.will be available OK Dec.99 (on loan from COMPASS exp.) tender for CMS mass prod.is at the latest days begin of mass prod.expected in spring 2000 OK fabrizio 15/5/2000

- b) -the first ROB should be ready in spring 2001 and first minicrates in September we must allow for 6 months contingency in case s.t. goes wrong (orange dates) -we need six month burn-in of electronics in the minicrates (at ambient temperature,now with standard procedures) -chambers will be installed EQUIPPED with full electronics chip status : (prod.=tender) BTI ready prod. 6/2000 * (1/2001) BTI mod. ready prod. 9/2000 * (3/2001) yield below 50% TRACO under test (1/2001) (6/2001) lay out problems : 2 submiss.jun/jul 00 TSS,TSM planned 1/2001 (id.) TRB planned 3/2001 (9/2001) TDC prod. end 2000 (6/2001) ROB planned 3/2001 (9/2001) minicrates planned 9/2001 (3/2002) expected date for availability * common Tender at end 2000 :Market S. June problems with $/CHF fabrizio 15/5/2000

draft INSTALLATION draft Installation demands the presence of technicians & physicists to avoid spoiling the labs : => install all the ch. of a Wheel in one go => install ch. equipped with R-Out & Trigger electronics => choose a sequence that minimizes the impact of possible construction delays => tune the construction sequence accordingly (RPC included) => install in UX YB0 mid 02 * YB+1 beg. 03 YB-1 end 03 YB+-2 in the last window in 04 ( YB+-2 are the most easy to handle in SX ) * a earlier installation in YB0 without electronics may also be considered fabrizio 15/5/2000

CURRENT CMS MASTER PLAN UP TO APRIL 2004 vers. 28 YB-2 YB-1 YB-0 YB+1 YB+2 YE-1,-2,-3 YE+1,+2, Windows for MU ch. Installation in SX (CMS SC march 20/00,under discussion) fabrizio 20/3/00 Modified 5/4/ In green the wheels assembly windows (for supporting rails) Installation procedures/tools/times…..must be understood and agreed DT+RPC INSTALL.

CURRENT CMS MASTER PLAN UP TO MARCH 2004 vers. 28 YB-2 YB-1 YB-0 YB+1 YB+2 YE-1,-2,-3 YE+1,+2,+3 Windows for MU ch. Installation in UX (to be confirmed) fabrizio 20/3/00