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Richard Kass 1OSU meeting, 04/24/2003
Limited Streamer TubeProject Overview
Richard Kass
Ohio State University
Introduction (why, who, what….)The big picture (will leave detailed discussions for tomorrow) tubes installation electronics Ongoing prototype tube workSummary
Richard Kass 2OSU meeting, 04/24/2003
Dec. 2
002
Richard Kass 3OSU meeting, 04/24/2003
Key LST Project Goals
Good efficiency to detect muons and KL’s must fit in the present barrel structure thickness of detector limited to “22mm”Long Term Reliability last until the end of BaBarInstallable during summer shutdowns 1/3 in 2004 2/3 in 2005
Richard Kass 4OSU meeting, 04/24/2003
The Initial LST Team*
M. Andreotti, D. Bettoni, R. Calabrese, V. Carassiti, A. Cotta Ramusino, G. Cibinetto, E. Luppi, M. Negrini, L. Piemontese
INFN Ferrara
T. Allmendinger, K.K. Gan, K.Honscheid, H. Kagan, R. Kass, A. Rahimi, C. Rush, Q. Wong, M. Zoeller
Ohio State University
C. Fanin, M. Morandin, M. Posocco, M. Rotondo, R. Stroili, C. VociINFN Padova
M. Loveterre, E Robutti, S Passaggio, S Capra, C Patrignani, S MinutoliINFN Genova
G Piredda, C. Voena, F. Ferroni, S. Morganti, L. CavotoINFN Roma
R. Baldini, A. Calcaterra, P. Patteri, A Zallo, U. Denni, INFN Frascati
L. Cavoto, R. Fernholz, C. Lu, J. Olsen, W. Sands, A.J.S. Smith Princeton University
*As of Feb BaBar Meeting
We welcome new groups!
Richard Kass 5OSU meeting, 04/24/2003
LST Building BlocksTubes: The basic building blockEach tube is ~210375 cmA tube forms the gas volume (IsoB/Ar/CO2)Anode wires are ganged together in a tube 16 wires/tube double layer small cells 8 wires/tube single large cellResistive graphite coating on inner wallsDo not readout anodes, use cathode strips~2000 tubes in system
Modules: Groups of tubesTubes (e.g. 6) glued together form a module~400 modules in system
Richard Kass 6OSU meeting, 04/24/2003
Propose double-layer of wires in small cells (9x8mm)
Readout of x and y coordinates from outside strips
Small Cell Tube Design
Single layer of 9x9 mm cells limited to ~90% by geometry Need 2 layers of wires to obtain efficiency > 95% Questions of long term reliability of 9 x 9 cells
Thickness of double layers ~23mmwill use 9x9’s where gap is only 22 mm
Will not readout the anode wires
Richard Kass 7OSU meeting, 04/24/2003
Double Layer Design
Richard Kass 8OSU meeting, 04/24/2003
Single-layer of wires in a large cell (15x17 mm)Readout of x and y coordinates from outside strips
Large Cell Tube Design
Reliability expected to be much higher for large cell less sensitive to mechanical imperfections
Failure rate of MACRO tubes 0.1% in ten years ZEUS high initial mortality, 5%, then 2 % in 7 years
Possibility to power HV on each or only 2 cells
Will not readout the anode wires
15x17mm cells
Richard Kass 9OSU meeting, 04/24/2003
The LST building blocks
Base Design:z-strips 38.5 mm wide 96/layer, 6912 total
-strips 42.5 mm wide 2 strips/tube 4074 total
10986 channels of electronics
Richard Kass 10OSU meeting, 04/24/2003
LST DETECTOR LAYOUT
Exploded view of the composite detector module.
strip readout board shown
Richard Kass 11OSU meeting, 04/24/2003
~ 0.9mm
WG
1
2
3
4
E
2 mm
1: PET 190 m with copper lamination machined in strips of width W and separation gap G; G = 2 mm, W = 36mm for the Z strips, W = 36mm or 40mm for the strips according to the version of LST.2,3: PET 250 m 4: PET 50 m with solid copper lamination
Composite readout strip plane
Richard Kass 12OSU meeting, 04/24/2003
Installation of the Z-strip plane decoupled from the modules Zstrip readout plane is installed before the modules
corner pieces are removed
Zstrip connectors located at the backward end of the Z plane will not block insertion of the modules from forward end of the IFR
Z
IFR BACKWARD
IFR FORWARD
signal connectors
z planefabricated from3 boards
Richard Kass 13OSU meeting, 04/24/2003
Z-Strip Plane Inserted into Gap before modules
THE Z-STRIP PLANE SLIDES INTO THE GAPA TOOLING FOR HOLDING AND MOVING THE FOIL IS NEEDED
Installation
Richard Kass 14OSU meeting, 04/24/2003
Modules Are Inserted Into Gap After Z-Strip number of tubes/modules/gap varies…
Installation
Richard Kass 15OSU meeting, 04/24/2003
An Individual Module Can Be Extracted From the Detector
Unlike the Present RPC System
De-Installation
Richard Kass 16OSU meeting, 04/24/2003
Electronics
Front End Electronics (Ferrara, Genova, Ohio State)
Conceptual Design for Front End completeHigh Voltage (Ohio State, Padova)
Conceptual design for OSU system completeEvaluating CAEN system
recycle high voltage system from LVDData acquisition system
Use present RPC system
Richard Kass 17OSU meeting, 04/24/2003
Front End card: block diagram
Richard Kass 18OSU meeting, 04/24/2003
Layout of the readout crate
Richard Kass 19OSU meeting, 04/24/2003
First OSU HV Prototype (5 ch)
6kV Dc/Dc
HV Op-Amp
15 V In
0-5 kV OutCurrent MonitorProtection
Floating 5VSupply
Current Monitor Outputs
Richard Kass 20OSU meeting, 04/24/2003
Tube Prototypes
1) pre-prototype double layer tubes (9x9=>9x8 mm)2) “standard” cells: 9 x 9 mm tubes3) “small” cells: 9x8 mm double layer tubes4) “large” cells: 15x17 mm single layer tubes
Four different types of tubes are under study
baseline
Very detailed studies of each tube geometry: voltage plateau mechanical stability signal quality shielding issues
Richard Kass 21OSU meeting, 04/24/2003
LST Prototypes
First prototype (two 9x8 profiles) was built in order to test the readout scheme
To do this old 9x9 profiles were machined down to 9x8 mm
Readout scheme successfully tested Efficiency measured, about 96%
The first double-layer prototype!
Configuration Efficiency
Both side ON 96.5%
1 side ON – same side
92.8%
1 side ON – opposite side
91.2%
Voltage Plateau narrower than expected Prototypes have been opened up and examined Problem traced to inadequate Q/C, rough edges in machined profiles (actual tubes will be extruded)
Richard Kass 22OSU meeting, 04/24/2003
“standard” 9x9 mm tubes
LST Protypes
Ordered 20 standard 9x9 tubes re-establish production quality 10 with Au-coated wires 10 with Ag-coated wires Plateau measurements in progress, first results are very good
1/4/03 Camere 3,85 mt filo Ag
020406080
100120140160
4200
4300
4400
4500
4600
4700
4800
4900
5000
5100
5200
5300
volt
cont
eggi
# 7
#3
#14
#12
#17
#13
#25
#16
#15
#26
silver wire
similar goodresults forgold wire
Richard Kass 23OSU meeting, 04/24/2003
LST Prototypes
“small” cellsPrototype pre-production of 9x8 mm cells two profiles in a single coverOrder for dies and all components placed Expect the tubes early MayGoal: Have these tubes tested by Elba meeting
Richard Kass 24OSU meeting, 04/24/2003
LST Prototypes
large-cell single layer prototype
Dies ordered for 15 x 17 mm cellGraphite coating machine modifications built This is not standard technology for Pol.Hi.Tech Fabricate parts necessary to complete prototype designed and orderedExpect to be able to test prototypes in early June
Richard Kass 25OSU meeting, 04/24/2003
Pol.Hi.Tech. will assemble and test tubes
Tube Construction and Assembly
Tubes will be manufactured and assembled in Italy
Focus on quality controlInspection of Comb Shape ProfilesInspection of graphite coatingSurface resistivity monitorwire stringing proceedureInspection of end capsTest for gas leaksHV conditioningLong Range Test and Plateau measurement Add Additional Checks as necessary
Richard Kass 26OSU meeting, 04/24/2003
Module AssemblyTubes will be glued together to make modulesAssembly sites at Princeton and OSUFocus on quality controlInspection of Shipping BoxesTube Resisitance and Capacitance MeasurementLeak Test??Burn in Procedure (~1 week)Signal Shape TestPlateau Curve (>300V)Tube EfficiencyScan Test with Radioactive SourceInspect stripsModule burn in test (~1 weeks) Add Additional Checks as necessary
Richard Kass 27OSU meeting, 04/24/2003
What Do We Have To Do?
1. Refine Cost estimate, WBS for IFC 2. Design cables and understand compatibility with RPC
FEC 3. Prototyping
1. Test present prototypes 2. Visit PolHITech to discuss manufacture procedures 3. Aging of PVC 4. Double and/or single layer 5. Decide geometries to order6. strip design7. Z strip design8. Obtain standard 9x9 with high resistivity 9. Make drawings for dies, mandrils
4. Understand finances for prototype costs5. Order prototypes 6. Test prototypes7. Order tubes
Pre-production
Richard Kass 28OSU meeting, 04/24/2003
productionDesign set Q/A up Follow construction at Polytech
Test tubes at PolHi TechShip to OSU and Princeton FEC design FEC design review Test FEC prototypeFEC productionCrates
FEC testingFEC Q/ADesign and fabricate Assembly Fixtures Material Handling, Equipment, and
procedures Receive and test tubes at assembly sites
Assemble modules
Full system test in USShip to SLACData Base setup
What Do We Have To Do?
z strip construction, QC
strip construction, QCHV System HV DistributionMonitoring, Controls (Gas System, HV, environment,
etc)Simulation Monitoring electronicsCablingGas system designGas system fabricationShip stuff to SLACReceive, test, store modules at SLACInstallation fixturesInstallation plan and procedurePlan for replacements, repairs
Many important tasks still not covered!Opportunities for new groups.
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