Presentazione sul tema: "BABAR: relazione dei referee Stato di PEPII RPC in avalanche mode Installazione degli LST Fondo comune Mauro De Palma, Claudio Luci, Amedeo Staiano."— Transcript della presentazione:
BABAR: relazione dei referee Stato di PEPII RPC in avalanche mode Installazione degli LST Fondo comune Mauro De Palma, Claudio Luci, Amedeo Staiano
Status of run5 Run5 currently >85% of Run4 (longest so far) Lagging behind schedule due to vacuum leak problem since mid November Evidence that the ongoing replacement of the Q2 region will fix the problem Problema con la luminosità
Status of run5 Run5 currently >85% of Run4 (longest so far) Lagging behind schedule due to vacuum leak problem since mid November Evidence that the ongoing replacement of the Q2 region will fix the problem
Recent Operation for Run 5b PEP-II operated through the holiday break. Luminosity ramped rapidly to 8.6 x For the past 2 months we have had three problems: IR 6 HER vacuum leak (bellows leak fixed Jan 4) IR4 LER vacuum spikes and instability (two gap rings fixed Jan 19) IR2 LER/HER vacuum spikes and instability (ongoing)
Long range plan for fixing IR2 Vacuum Spikes Continue experiments and have vacuum interventions as needed: ~February 23: Replace LER Q4 and Q5(?) chambers with high power temporary chambers and check for loose tiles in forward Q2 bellows. (3 days) ~March 20 if needed: Replace Q2 crotch chamber and Q2 bellows module. (9 days) ~March 20 if needed: Replace HER forward Q4 and Q5 chambers (7 days) ~June if needed: Pull support tube and repair radial ion pump, Q1 chamber, or B1 chamber (?) (90 days) (Needs SLAC overall planning review)
PEP-II Long Term Run Schedule Run 5b: November 2005-July 2006 Down: August-November 2006 (major upgrades for PEP-II & BaBar + LCLS installation) Run 6:December 2006-August 2007 Down:September-November 2007 (safety + LCLS installation) Run 7: December 2007-September 2008.
PEP-II Overall Parameters and Goals ParameterUnitsDesign Present in collision 2007 goal I+mA I-mA Number bunches y*y* mm Bunch length mm yy Luminosityx Int lumi / day pb Over five times designOver three times design
PEP-II Conclusions In Run 5a in October PEP-II achieved a new luminosity record (1x10 34 ) PEP-II Task Forces are revitalized and under way to address accelerator issues. Plan in place to address present IR2 vacuum issue. Planned upgrades towards >2 are on track. A run plan is in place with a target of 1 ab -1 in 2008.
P5 Report given to HEPAP march 3 rd Recommandation to run trough 2007 and possibly until 2008 Recommandation to engage non-US agencies in a discussion of issues and timetable Next visit to SLAC April (IFC next meeting – June 06)
Projected data sample growth Integrated Luminosity [fb -1 ] L peak = 9x10 33 Sep 05 plan Feb 06 (my guess) oPEP-II: IR-2 vacuum, 2xrf stations, BPM work, feedback systems oBABAR: LST installation 4-month down for LCLS, PEP-II & BABAR Double from 2004 to 2006 ICHEP06 Double again from 2006 to 2008 ICHEP08
Impact of current shortcome Integrated Luminosity [fb -1 ] Sep 05 plan Feb 06 revision KEKB no crab effect (guess) KEKB from Oide
22/3/2006 The BaBar IFR 1 < < < < < < 0.7 The BaBar IFR is composed by an hexagonal barrel around the beam pipe and 2 encaps covering the forward and the backward region.
22/3/2006 Outlook (R.Calabrese) RPC in the Forward Endcap –Problems with RPC and possible solutions: RPC in avalanche mode –Results of the test on 3 middle chambers of Forward Endcap –Proposal for the full detector LST in the Barrel –2004: installation and commissioning of 2 sextants –2005/06: data taking, detector performances Efficiency Stability Maintenance –Summer/fall 2006: complete the installation with the 4 remaining sextants Readiness (modules, electronics, mechanics) Schedule and manpower
22/3/2006 Avalanche RPCs project We hope to solve 2 separate problems concerning the forward RPCs by switching to avalanche mode operation: –Reduce the aging effect –Improve the rate capability Both are related to the high background/signals rate seen at small radius in the inner Forward endcap layers
22/3/2006 Efficiency loss at small radii Efficiency loss in highest rate regions growing worse with time Layer 1Layer 4Layer 10 Feb Oct Dec Jan Jun Jun Measured rate vs. luminosity Black - Oct. 03 Blue - July 05
22/3/2006 RPCs in Avalanche Mode A proposal to operate some RPC modules in avalanche mode has been studied and tested The idea is to put a pre- amplifier close to the detector but outside the gaps. Switching to avalanche mode require change of gas mixture and operating voltage. And use the same front-end electronics used so far in streamer mode. Changing the value of a resistor the gain of the amplifier can be easily adjusted.
22/3/2006 The preamplifier prototype Layout of the prototype RPC preamp card installed in BaBar in October/November The board has the standard 160mm of a Eurocard board but it is only 5U tall. Power is supplied via 3 pin headers in the back of the card. Designed by A.Cotta Ramusino Flat cable IN Flat cable OUT Power
22/3/2006 Test on 3 running endcap chambers 3 middle alternate chambers of the BaBar forward endcap have been implemented during October 2005 shutdown. 2 preamps mini-crate have been installed on the endcap door just outside the gaps. The goal is to see after the mode switching whether or not these regions are getting better efficiency and to slow down the aging effects.
22/3/2006 Efficiency maps for avalanche RPCs Good improvement at small radii
22/3/2006 Efficiency comparison Compare RPCs efficiencies before and after switching of the operating mode (same Luminosity) Up to 30% improvement at small radii
22/3/2006 The “avalanche mode” proposal The upgrade foresees the implementation of the middle chambers of the 8 innermost layers of the forward endcap. 4 crates for new boards will be installed on the endcap doors. Separate power supplies are needed for the preamplifier. A new gas system will provide the proper gas mixture to the avalanche chambers.
22/3/2006 Electronics specifications The system which will be installed will be different from the prototype system in that: the preamplifier cards will be upgraded to feature a simple way of remotely changing the gain of individual channels the preamplifier cards size will become a full 6U height by 160mm depth the preamplifier cards will be equipped with a 96pin DIN connector to connect to a custom backplane based on a breadboard backplane from Schroff or a standard J2 backplane. the center row of the backplane connectors will reliably distribute power to the preamplifier cards as well as providing the daisy chained serial bus for gain setting. the cards will be hosted in a standard 6U crate with a 1U fan tray unit. The crate will be 84 TE wide and will host up to 21 boards, one of which may be a repeater card used to connect the crate-wide daisy chain for gain programming to the controlling CPU
22/3/2006 Low Voltage power supplies Number of layers to be equipped:8 layers of the middle RPC middle chambers Number of crates need:4 crates (TopEast,BottomEast,TopWest,BotWest) Total number of boards needed:80 boards (feeding 160 FECs) Estimated current consumption for each +5V, -5V consumption for the +5V, -5V (includes a possible repeter card for the gain setting digital link) Power supplies (present RPC power supplies were tested at Princeton and found too noisy): Two KEPCO 6V 25A linear power supplies mod. ATE 6-25M per RPC preamplifier crate 8 KEPCO ATE 6-25M units + spares
22/3/2006 Cost estimation: preamplifier
22/3/2006 Cost estimation: PS, cable and crate costs for Power Supplies 28POWER SUPPLIES (option ATE6-25M) 10$1, $19, Total for Power Supplies$19, cost for cables 29pn ribbon conn female 4384$3.28 $1, DIN IDC connector for 64 conductor flat cable 196$7.00 $ ribbon cable 34conductors 1.5m X $3.00 $ ribbon cable 64conductors 1.5m $7.00 $ Total cost for cables$3, costs for VME crates for RPC PREAMPLIFIER BOARDS 33 VME CRATES 6U * 160MM + FAN TRAY + FRONT PANELS + J2 BACKPLANE 4$1, $7, Total for VME crates for RPC PREAMPLIFIER BOARDS$7,200.00
22/3/2006 Cost estimation: gas system
22/3/2006 Total cost of the project Pre-amply cardsBoardsPrice/BRD96 BRD Price Components96$$8,100 Assembly96$$11,400 NRE charges$4,200 Total$23,700 Other electronicsQuantityPrice/unitTotal price VME Crates4$$7,200 Cables and connectors $3,500 Power supplies 10 $19,000 Total$29,700 Gas system Total$48,500 Grand total$101,900
22/3/2006 Funding request The total cost of the electronics (preamplifier + crates + LV power supplies) is about one half of the total cost of the project. We ask 44 KEuro (53k$) to cover the expenses for the electronics of the avalanche project. The gas system will be funded by USA.
22/3/2006 Summary RPC part BaBar RPCs suffer of two different problem: –Aging effect –Rate capability inefficiency at small radii Switching RPCs operating mode from streamer to avalanche will slow down the aging and solve the rate capability problem. A prototype board has been developed as preamplifier between the RPC chamber and the FEC. Tests, with a BaBar test chamber and with the running RPCs, gave very good results. We propose to switch to avalanche mode the middle chambers of the 8 innermost layers (the ones which suffers the major aging) The total cost of the project is ~100k$. We request INFN to support half of the project to contribute with the electronics (preamplifier, crates, LV power supplies)
22/3/2006 LST detector During summer 2004 the installation of 1/3 of the barrel took place. 8 INFN physicists and technicians were on shift during installation. The installation has been successfully completed few days ahead of the schedule. 2 INFN physicists and one technician were present during the commissioning of the detector. The detector has been fully integrated into BaBar without major complications installation
22/3/2006 Cosmics test First tests and commissioning have been done with cosmic runs LST RPC Efficiency radiography Online event display
22/3/2006 Performance summary Average reconstruction efficiency ~91% Much better muon identification and pion rejection –E.g. with 90% muon id we reject 97% of the pions Stability over the time. Very low infant mortality and basically no loss of channels in 18 months of operation. Good and stable single rate plateau.
Exp need: Lepton identification RPC degradation LST recover At 98% pion rejection efficiency increases by 40%
22/3/2006 RPCs reconstruction efficiency Per module efficiency
22/3/2006 Installation readiness: electronics The FE electronics for the installation is under test in Ferrara. Signal cables are being assembled in Ferrara. FE crates, HV power supplies and HV cables are already at SLAC (used for the module test)
22/3/2006 Installation schedule and manpower There will be a 4 months shutdown beginning Aug. 1 st. An installation meeting is scheduled for the end of May. Huge phys and techs activity next summer/fall (installation, cabling, electronics, QC, commissioning) FromToWhat 1-Aug-0621-Aug-06Open detector and Lower West disassembly 22-Aug-067-Sep-06Lower west installation 8-Sep-0626-Sep-06Upper west installation 27-Sep-0619-Oct-06Lower east installation 20-Oct-068-Nov-06Upper east installation 9-Nov-0622-Nov-06Reassembly and close detector
Lavoro preparatorio -Rimozione delle scatole di distribuzione HV Barrel IFR -Rimozione delle Front End Cards Barrel IFR -Rimozione tubi gas, cavi HV, cavi segnale Barrel IFR Installazione nuovi sistemi (elettronica Front End, HV, gas) -Installazione dei rack che alloggiano l’elettronica di Front End -Installazione dell’elettronica di Front End -Installazione e messa in opera del sistema di alta tensione -Installazione e messa in opera del sistema di distribuzione del gas Rimozione RPC/Installazione LST (per ognuno dei 4 sestanti laterali) -Installazione strutture meccaniche di supporto e posizionamento -Rimozione 18 strati di RPC -Installazione 6 strati di assorbitore -Installazione 12 strati di LST (strip z + rivelatori) -Installazione tubi gas, tubi ‘dry air’, cavi HV, cavi segnale -Rimozione strutture meccaniche di posizionamento Software -Aggiornamento del database del rivelatore -DAQ Installazione 2006
Installazione 2006: manpower richiesto Installazione 32 m.u. (16 m.u. nel 2004) Elettronica 4 m.u. (3 m.u. nel 2004) Software 2 m.u. (1.5 m.u. nel 2004) Commissioning 2 m.u. (2 m.u. nel 2004) Totale 40 m.u. TotTechsPhysicist FE GE LNF PD743 PG110 RM321 TO
22/3/2006 Summary of LST part The LST 2004 installation has been a success of schedule, work organization and results. The LST detector is well integrated in BaBar. Its performances highly improved the muon identification and the pion rejection. The LST technology demonstrated its stability and robustness. A lot of activities are on going for next installation.
Cosa possiamo concludere? (G.Piredda) Il rivelatore funziona bene (tranne gli RPC del barrel) Babar produce e produrra’ ancora parecchia fisica con sensibilita’ ai limiti del MS, esiste una vasta comunita’ interessata IFC a gennaio ha approvato il programma Pep-II ha problemi che dovrebbero risolversi in breve tempo (come e’ sempre accaduto) in modo da confermare il piano Nei prossimi appuntamenti P5, CSN1, IFC.
Nuovi membri nella Collaborazione FTE=+11 (Mica male! [Piredda] ) in gran parte dottorandi + altri impegni (TS) FE (3), LNF(1), PD(1),PG(1),PI(2),RM(2),TO(1) Secondo gli algoritmi (di Babar, non dei referee) : MI 1.2kE*FTE 13 ME 1.1*FTE* Nuovi task (6 mu TS) 40 Consumo (2.2*FTE) 23
Common fund (G.Piredda) Quota italiana USD 600K versati nel K Per i rimanenti 250K abbiamo una assegnazione di 100kE Chiediamo 105kE a completamento della quota (USD=0.82E)
Commenti referee RPC in avalanche mode: I layer più interni degli RPC non sono fondamentali per la mu id; tuttavia l’idea di far funzionare gli RPC in avalanche è valida, e se Babar vuole, può essere implementata, MA a costo ZERO per l’INFN. Quindi: Finanziamento interamente americano, con eventuale contributo dei gruppi italiani trovato nel metabolismo dei gruppi
Commenti referee Installazione LST: I restanti 4 sestanti del barrel vanno installati, a patto che babar continui a funzionare fino ad ottobre 2008, raggiungendo la luminosita di 1 ab -1 L’esperienza passata con il DOE ci ha “scottato”, quindi finanziamo l’istallazione, con un paio di caveat: Se PEPII non risolve il problema della luminosità, l’esperimento dovrà consultare i referee prima di impegnare i fondi. Se una volta installati gli LST, babar dovesse chiudere prematuramente, questo potrebbe avere delle conseguenze sugli impegni finanziari futuri dell’infn verso l’esperimento.
Proposte di assegnazione ME: vengono date solo quelle necessarie all’installazione (37 mu=248 ke) e viene ripreso dalla commissione il restante s.j. (70 ke: taglio del 10% sull’assegnato) Non vengono finanziati i nuovi ingressi nell’esperimento Consumo: viene finanziato solo il consumo necessario all’istallazione degli LST. (e i trasporti). Fondo comune: a fronte della richiesta di 205 ke, viene sbloccato il s.j. di 100 ke e NON vengono assegnati (adesso) i restanti 105 ke. (vedi caveat istallazione LST)
Ripartizione ME e consumi SezioneME (ke)ConsumoTrasporti FE GE 303- LNF 304- PD 475- PG 7-- RM TO 10--