- Количество слайдов: 23
IFR-LST status report G. Cibinetto INFN Ferrara Babar Collaboration Meeting, Feb. 21, 2004 • Milestones • LST production status • 1 st module assembled • Princeton workshop • Strips production • Electronics • High Voltage • Software
LST Milestones successfully passed • • • • Dec 15 ’ 02 June 12 ‘ 03 June 15 June 22 June 27 June 30 July 17 Aug 1 Aug 26 Aug 27 Sept 3 Oct 1 Oct 22 Nov 10 Nov 30 -------- • • • Dec 15 Dec 18 Jan 7 ’ 04 Jan 9 Jan 14 Feb 9 ------- Ba. Bar chooses LST for IFR Upgrade EPAC Review Approves LST Proposal Cost/Schedule/WBS prepared INFN Gruppo Uno Evaluation Ba. Bar IFC Approves Project Large/Small Cell Decision Electronics Design Review Place Orders for Tubes & Small parts Q/A Review Install Test Module in Ba. Bar Fire safety approval for materials (tubes, strips, cables) Decide to read out Phi via wire signals instead of strips Mechanical, Schedule (Installation) & Budget Review Tube Production begins! Orders placed for components: electronics, crates, HV system, signal cables, HV cables Phi Readout plane & Z-strip production begins at SLAC First shipment (~5%) of tubes to Princeton/OSU Q/C systems operational at OSU, Princeton First module assembled at Princeton First module passes Q/C tests 168 “standard” tubes shipped to Princeton
LST Remaining Milestones • Mar 1 • • Mar 15 Apr 2 • • Apr 10 Apr 15 • • • Apr 30 May 4 May 20 May 25 May 27 Jul 31 Aug 15 Oct 8 Oct 15 Jul 2005 ----------- 168 tubes (partially 7 -cell and layer 18) shipped to Princeton Electronics tests begin 2% of modules shipped to SLAC Q/C system operational at SLAC, Crate delivered 320 Tubes shipped to Princeton Installation tooling complete Electronics complete Gas system assembled, under test at SLAC Electronics, crates, HV shipped to SLAC 336 tubes shipped to Princeton Installation Readiness Review Ship all modules for 2 sextants to SLAC Final 334 Tubes shipped to Princeton Q/C begins at SLAC LST module construction complete (6 sextants+spares) RPC removal begins Installation of 2 sextants complete Run 5 begins Install remaining 4 sextants
LST production at Pol. Hi. Tech.
LST production status LSTs in the conditioning station Operations in the clean room
LST production status • Tubes production started at Pol. Hi. Tech. on Nov. 10 • Since mid. Decembre 15 tubes/day assembled • Up to now more than 500 LSTs assembled produced 564 passed HV conditioni ng 302 passed plateau 272 passed scan test 212 waiting for conditioning shipped 192 121 under conditioning 132 waiting for source scan test 50 under long term test 30 168 on Feb. 9 24 before Xmas 8 -cell tubes production for the 2 sextants to be installed in 2004 finished. Next Monday will begin the production of 7 -cell tubes.
LST production status • The Quality Control system is fully integrated with the production. – The system can handle the number of tubes produced daily by the factory. – Babarians work is fundamental for the diagnostic and the quality certification of the chambers. INFN provides 3 shifters + a production manager per week. – The QC system can identify systematic and random defects of the tubes. – The source scan test has been added to the standard QC procedure. So far ~30 tubes rejected by the QC system
First 24 tubes arrive Jan 2 in Princeton All tubes survived the trip Test stand in operation in Hi-Bay area
Performance of first 24 tubes – HV plateaus All 24 tubes show good plateau All tubes are still working properly
First production module assembled Jan 9
Princeton workshop – Jan 30/31 Installation Ø Ø Connections Routing Layer 18 Module testing High Voltage Ø Connector Ø Protection Software Ø Task list Ø Planning Organization Ø Installation logistics Electronics Ø Electronics tests
Installation mechanical summary and utilities Inside steel Ø Backward end: z strip readout, HV connections Ø Forward: strip readout Radial conduit Ø An “incremental conduit” is the plan for bringing the utilities out. With the incremental conduit a section of conduit goes in with every layer leaving the most available working space for succeeding layers HV connector and cables (we have an expert, Dave Warner from Colorado State) Ø To avoid the entire length of the high voltage cable to be handled during installation. Ø They should be placed outside the detector in an area where the HV cables leave the conduit.
Installation mechanical summary and utilities Z-Strip Routing: Ø Placement of the readout lines of the z-strip was of major concern due to the limited space for the utilities. Ø We came up with a viable solution for the top and bottom sextants by attaching them to the sides of the center gap plate. Ø This solution is very space efficient but only works in the top and bottom sextant Ø The side sextant solution is under discussion. Layer 18 Ø All the utilities must be accessed from the forward end because of the existing flux bars that seal this layer Ø The solution is to get the utilities organized in the gap so the flux bar could be replaced without crushing them Ø Since this layer is sealed by the flux bar extensive testing needs to be done prior to the replacement of the flux bar
Installation mechanical summary and utilities Backward side utilities installation: transition board and HV connectors Sketch of the forward side with the space for the strip readout
Strip production @ SLAC
planes production status • 550 cables received. • Plane production is underway in End Station A • 2 shifters working at a time with production manager • 10 planes produced per bake cycle • May be able to do 2 cycles per day • 68 “ 2 by 8” planes produced so far • 50 planes shipped to Princeton • 24 “layer 18” planes also produced Flexible Flat Cable (FFC): 100 mils pitch
z planes production status • 3 "1 module wide" prototype planes produced – 1 installed in Ba. Bar during last ROD – 1 to be shipped to Princeton – 1 to be used in tests at SLAC • For production planes the main issue is the cable length. • There are 216 different lengths of cables needed • We need to know/control the lengths to better than 1 cm • Current plan is – – Buy bulk cable from Parlex Cut to length here at SLAC Send cables back to Parlex for etching Send cables to Cable Connection for crimping z planes production is postponed after the plane for 2004 installation will be finished.
Readout front end electronics Input Analog Daughter (IAD) card INFN -TO 12 prototypes ready and tested Order for full production placed Amount for 2004 installation ready by the end of march LST-FE card INFN -FE 3 prototypes ready and tested Order for full production placed. Amount for 2004 installation ready by the end of march
Readout front end electronics test Prototype of mother board + IAD tested in Princeton on the first module prototype with transition board for wire signals + and strip readout
LST Crate, Crate Service Card and FSD Layout of the Ba. Bar LST crate LST CRATE INFN -GE Material for 13 crates ordered Backplane and CSC/FSD board ready by the mid of march
High Voltage 80 channels/box 1: 4 Fan out (“per tube”) Up to 4 diff. voltages Current Monitor ZEUS over-current protection Canbus, Ethernet Interlocks Uses external HV supply Prototype under construction Production ready by mid April
Software • reconstruction. – Revisit 1 -D clustering (currently it can connect non-adiacent strips to deal with dead FECs) – Investigate possible effect of constant pitch – Teach the swimmer (Kalman. Filter based) about the dead spaces. • efficiency monitoring. – Test current code on LST (each tube is smaller than an RPC) • software for cosmic runs – Reuse the code already available (Ifr. Cosmic) – Useful to analyze cosmics in teststand then to debug detector at the end of installation (first cosmic runs). • muon. ID algorithm – Revisit the current selectors – Study discriminant variables, feedback to reconstruction tweaking – Introduce dependance in barrel.
LST Summary • Success of first module validates construction and testing procedures. • Now in full Production at PHT. – 15 tubes per day – Q/C is able to keep up – Shipments scheduled • Assembly sites at Princeton and OSU in operation • Strip planes in production at SLAC • Installation, Electronics, HV, etc. under control and on schedule for summer installation of 2 sextants. • Major challenge: maintaining quality and schedule