1. Limited Streamer Tube Project Summary
Richard Kass
Ohio State University
Richard Kass

2. 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 BaBar
Installable during summer shutdowns
1/3 in 2004
2/3 in 2005
Richard Kass

3. The LST Team INFN Ferrara INFN Padova INFN Genova INFN Roma
INFN Frascati
Ohio State University
Princeton University
SLAC
UCSD
Richard Kass

4. The LST building blocks
We need:
grounding diagram
signal path
cabling diagram
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

5. 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 plane
fabricated from
3 boards
Richard Kass

6. Z-Strip Plane Inserted into Gap before modules
Installation
Z-Strip Plane Inserted into Gap before modules
THE Z-STRIP PLANE SLIDES INTO THE GAP
A TOOLING FOR HOLDING AND MOVING THE FOIL IS NEEDED
Many issues with z strips
how many sections?
how are they held in place?
signal connections?
grounds?
Richard Kass

7. Installation
Modules Are Inserted Into Gap After Z-Strip number of tubes/modules/gap varies…
Summer 2004 installation issues:
how much room do we have for bottom sextant?
length of tubes for bottom sextant?
length of z strip boards
connections? what is blocking what?
Richard Kass

8. Tube Prototypes Four different types of tubes are under study
1) pre-prototype double layer tubes (9x9=>9x8 mm)
2) “standard” cells: 9 x 9 mm tubes
3) “small” cells: 9x8 mm double layer tubes
4) “large” cells: 15x17 mm single layer tubes
baseline
Very detailed studies of each tube geometry:
voltage plateau
mechanical stability
signal quality
shielding issues
Results from prototypes
are crucial to determine
final system parameters
Richard Kass

9. Pol.Hi.Tech. will assemble and test tubes
Tube Construction and Assembly
Tubes will be manufactured and assembled in Italy
Pol.Hi.Tech. will assemble and test tubes
Focus on quality control
Inspection of Comb Shape Profiles
Inspection of graphite coating
Surface resistivity monitor
wire stringing proceedure
Inspection of end caps
Test for gas leaks
HV conditioning
Long Range Test and Plateau measurement
Add Additional Checks as necessary
Richard Kass

10. Module Assembly Focus on quality control
Tubes will be glued together to make modules
Assembly sites at Princeton and OSU
Focus on quality control
Inspection of Shipping Boxes
Tube Resisitance and Capacitance Measurement
Leak Test??
Burn in Procedure (~1 week)
Signal Shape Test
Plateau Curve (>300V)
Tube Efficiency
Scan Test with Radioactive Source
Inspect f strips
Module burn in test (~1 weeks)
Add Additional Checks as necessary
Richard Kass

11. What Do We Have To Do? Pre-production
Refine Cost estimate, WBS for IFC
Design cables and understand compatibility with RPC FEC
Prototyping
Test present prototypes
Visit PolHITech to discuss manufacture procedures
Aging of PVC
Double and/or single layer
Decide geometries to order
F strip design
Z strip design
Obtain standard 9x9 with high resistivity
Make drawings for dies, mandrils
Understand finances for prototype costs
Order prototypes
Test prototypes
Order tubes
Richard Kass

12. What Do We Have To Do? production Design set Q/A up
Follow construction at Polytech
Test tubes at PolHi Tech
Ship to OSU and Princeton
FEC design
FEC design review
Test FEC prototype
FEC production
Crates
FEC testing
FEC Q/A
Design and fabricate Assembly Fixtures
Material Handling, Equipment, and procedures
Receive and test tubes at assembly sites
Assemble modules
Full system test in US
Ship to SLAC
Data Base setup
z strip construction, QC
F strip construction, QC
HV System
HV Distribution
Monitoring, Controls
(Gas System, HV, environment, etc)
Simulation
Monitoring electronics
Cabling
Gas system design
Gas system fabrication
Ship stuff to SLAC
Receive, test, store modules at SLAC
Installation fixtures
Installation plan and procedure
Plan for replacements, repairs
Richard Kass

13. Issues to be resolved ¨Finalize quality control requirements
¨Length of tubes??? (3.75m??)
¨What to do about layer 18? (and bottom sextant)
¨Better understanding of ground/shielding of tubes
source current vs ground plane location?
¨Reduce number of module types ?
trade solid angle for ease of construction/installation
¨Which layers get brass?
¨ Can we learn something about the gap size(s) this summer?
¨ LST Gas System
how much of RPC system can be used?
plumbing?
how much flow? backpressure?
¨ Cabling
how are modules cabled?
cable runs in and out of detector
Richard Kass