US CMS EMU

1
US CMS EMU Collaboration Meeting
CSC FNAL Factory Issues/Bottlenecks Introduction
Panel Production Design Review / Operation
Readiness Panel Issues Cleaning Machine Chamber
Assembly Electronics MTTF Tooling (FNAL Foreign
Sites) Grounding Panel Gluing for PNPI and
IHEP Organization Sign-off / Change Control Board
2
US CMS EMU Panel Production

• Major Milestones
• Start Panel Production for ME23/2 April 1999
• Start ME23/2 Chamber Production October 1999
• Start Panel Production for IHEP/PNPI January
  2000

3
US CMS EMU Panel Production

• Panel Production - Operation Readiness Review
• Design Project Engineer
• QA/QC Program Physicists
• ESH Lab 8 Floor Manager
• Procedures Travellers TD Process Engineering
• Lab 8 Floor Manager
• Tooling Lab 8 Floor Manager
• Manpower Lab 8 Floor Manager
• Panel Transportation TD Material Control
• Schedule Site Manager

4
US CMS EMU Panel Production

• Design Review
• Committee
• B. Trendler Chairperson
• J. Kerby
• P. Schlabach
• D. Denisov
• J. Krider
• Charges to Committee
• Assess the Chamber Design Readiness for the
  ME23/2 Chamber
• Review the specific drawings of the ME23/2
  chamber with emphasis on features related to
  panel machining and parts to be procured
• Provide a short written report to the L2-L3
  Managers and Site Managers

5
US CMS EMU Panel Production

• Physics Requirement
• Spatial Resolution 150 mm per chamber
• Good knowledge of strips and wires geometry
• Strips are located by machining (Gerber)
• Location Precision /- 5 mils
• Dimension of Strips
• Position of Strips
• Referencing of Strips to Outside World
• Wire are adjusted by combs on pre-glued anode
  bars
• Location Precision /- 20 mils

6
US CMS EMU Panel Production

• Physics Requirement (cont.)
• Gas Gain Uniformity
• Gas gain depends on gas gap
• Gas gap must be held constant in the horizontal
  (cosmic testing) and vertical positions.
• Requirement DG/G lt 2
• Dd (gap dimension) lt 24 mils
• Use gap bars (chamber perimeter)
• Use gap buttons (center)
• Avoid build up of tolerancies over 6 layers
• Panel Requirement
• Flatness
• Thickness
• Resistance to compressive forces

7
US CMS EMU Panel Production

• Alignment
• Extra holes on top panel
• Need quick resolution
• Avoid Manpower cost in panel handling.
• Electronics (?)

8
US CMS EMU Panel Production

• Frame Mounting

9
US CMS EMU Panel Production

• Panels Location
• Neglecting friction forces, panels could slip up
  to 2 mm (sic!) relative to each other.
• Side plates are a structural part of the chambers
• eg no access to cathode or anode connectors (or
  anode protection boards) without the risk of
  panels shifting
• Plans
• Wisconsin
• Compute panels shifting with an incomplete frame
• Fermilab
• Photogrammetry measurement of panel shifting in
  different orientations
• Question
• Need for alignment in-loco ?
• Need more alignment pins ?

10
US CMS EMU Tooling

• Support for FNAL Tooling
• Mechanical Support available (TD)
• Electrical support
• PPD Resources
• Conflict with higher priority projects (D0 - CDF)
• Inactive/inoperative pieces of tooling
• Gluing machine
• Un prepared to reproduce critical tooling for
  PNPI/IHEP
• Winding Machine
• Soldering Machine (?)
• Will investigate the possibility of using TD
  resources

11
US CMS EMU Grounding

• P3 - New Grounding Scheme
• Effect manpower cost on assembly floor ( more
  to do more soldering)
• Any deadline for a decision ?

12
US CMS EMU Collaboration Meeting

• Panel Gluing for PNPI/IHEP
• Proposal to glue panels (Gap bars / Anode Bars)
  at FNAL
• Advantages
• Quality Control on glue (shelf life, curing
  period)
• Uniformity of operations
• Quality Control on final product (height of
  anode bars on panel)
• Easy access to spare parts
• Availability of Tooling at FNAL to produce a
  uniform product
• Shipping of Kits in chamber-like form
• Disadvantages
• Labor cost
• We need a L2-L3 manager resolution of this
  proposal

13
US CMS EMU Organization

• 4 US-CMS meeting/year is OK for an RD project,
  not a construction project
• Need better coordination between 3 EMU subgroups
• L2 (or delegate) responsibility
• need driving directions originated by Project
  Schedule
• Need of Sign-Off group
• Major production decisions must be signed off by
  the appropriate responsible parties
• L2 Manager
• L3 Managers
• Alignment Experts
• Electronic Experts
• Need Change Control Organism
• Estimate cost Schedule impact of proposed
  changes
• Sign-Off Change Control