OSU meeting, 04/24/2003 Richard Kass1 Limited Streamer Tube Project Overview Richard Kass Ohio State University Introduction (why, who, what….) The big

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


Dec. 2

002


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


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!


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


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


Double Layer Design


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


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


LST DETECTOR LAYOUT

Exploded view of the composite detector module.

strip readout board shown


~ 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


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


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


Modules Are Inserted Into Gap After Z-Strip number of tubes/modules/gap varies…

Installation


An Individual Module Can Be Extracted From the Detector

Unlike the Present RPC System

De-Installation


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


Front End card: block diagram


Layout of the readout crate


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


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


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)


“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


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


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


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


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


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


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.

Documents

OSU meeting, 04/24/2003 Richard Kass1 Limited Streamer Tube Project Overview Richard Kass Ohio State University Introduction (why, who, what….) The big