Post on 05-Jan-2016
NUMI
Transmission Line (TL) Review
WBS 1.1.3 Power Supply System
Transmission Line (TL) Review
Nancy Grossman
FNAL
April 23, 2003
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 2Outline
Overview & Specifications (N. Grossman, 10’) Scope of review General Layout & Overall Specifications Schedule, Concerns
Response to Recommendations (2/26/02 review) (N. Grossman, 10’)
Testing at MI8 (J. Hylen, 15’) Remote clamp & joint testing so far Future plans
Ionization Calculations (J. Hylen, 10’)
Cooling Calculations (A. Stefanik, 10’)
TL through Block & Beyond Design/Status (B. Boettinger, 45’) Design (clamps, connection, supports) Heating/cooling (expansion) & Vibration Issues Service Considerations
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 3
Scope and Conceptual Layout:Target Hall Transmission
Material: Aluminum, Dimensions: 12 inches wide by 3/8 inch thick Width: Stripline nominal width is 12 inches, reduce to 8” from below clamp to horns. Gap: Stripline nominal spacing between bars is 3/8 inch, can increase in flex region.
HORN 1 JOINT
HORN 2 JOINTREMOTE CLAMP
REMOTE CLAMP
ROCK WALL BETWEEN PS ROOM AND TARGET HALL- 23’
REMOVABLE Z-BAR
REMOVABLE Z-BAR
REMOVABLE 28’ SECTION
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 4
Scope and Conceptual Layout:Target Hall Transmission
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 5Scope/Charge to Group
Scope Includes: Transmission Line design from joint/remote clamp to connection at capacitor bank
Electrical Isolation Considerations Heating/cooling (thermal expansion) Vibration
Stands & support structures to hold transmission line in place Wedge clamps in the transmission line block Support stands in the target hall Three point support structure in 24” round penetration from hall to PS room
Service Considerations Removing the section through the wall Horn replacement
Cover to protect transmission line – to be designed, simple slanted sheet metal Charge:
Look at overall design. Consider QA, longevity, ESH issues. Comment back to grossman@fnal.gov within a week.
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 6
MI-8 Fingers, Remote Clamp
Remote clamp plugged in @ MI-8
Horn 1 joint/electrical plug @ MI-8
Routine pulsing of prototype horn 1, production horn 1 joint, remote clamp underway: ~370,000 pulses to date.
Goal is 1 million pulses, 1/2 offset/flexed
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 7
Joints and Remote Clamp
Horn 2 joint in machine shop (now done)
Horn 1 joint, remote clamp at MI-8
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 8
Overall Specifications/Concerns
1. Lifetime: Part of stripline connected to horn will be replaced each time a horn is
replaced, ~>1 year. Part of stripline within stripline block (includes clamp) does not have to be
replaced every time a horn is replaced, but we will most likely have a spare just in case.
Lifetime of NuMI ~ 10 years2. Radiation Environment such that ceramics must be used near the beam, but
not necessary above the module/T-blocks.
Ceramics spacers from horn to top of module/block G-10 spacers used beyond that as insulators
3. Vibration, keep to a minimum everywhere. Biggest horn vibration is from stripline (MI8 measurements) Not near horn natural frequencies (200 Hz), damping times short wrt rep-rate Clamp every 12” in target hall
Pulsed for about 9.5 millions pulses at MI-8 (non-joint portion of transmission line) with no problems – clamping every 12”
More on recent vibration measurements from Jim.
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 9
Overall Specifications/Concerns
4. Cooling Target chase cooled by ~24,000 cfm flowing in the beam direction in the
horn region and back in the opposite direction between the top of the T-blocks and the concrete cap.
Beam heating: ~183 KW/m3 (transmission line near the beam) TL Electrical heating: ~27 KW/m3 (flex joint number) Assume air cooling from target chase is sufficient (A. Stefanik talk) Want air flow through TL shield block from top of module to horn (this air
flow cools stripline) Air dam is needed at the H-block cover between the module and the
stripline along the target hall wall (intended to contain air-borne radiation).
5. Service Considerations: Must not block survey holes in T-blocks just off module ends, need direct
vertical line of sight. Two removable sections to allow removal of section through the wall (28’). Removable “z-bar”s at top of module/block. Allows replacement of horns.
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 10
Transmission Line: Through the Block
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 11
Transmission Line: Through the Block
( figure slightly out of date )
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 12
Transmission Line: Through the Block
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 13
Transmission Line: Beyond the Shielding
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 14
Transmission Line: Beyond the Shielding
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 15
Transmission Line: Beyond the Shielding
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 16
Transmission Line: Through the Rock Wall
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 17
Transmission Line: Through the Rock Wall
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 18
Response to Recommendations: Horn PS/TL Review (August 2001)
Consider using a dynamic type fastener (e.g., spiralock nut) in the clamp joints and stripline support brackets. This is being done, except in the block region where it is tack-welded to the
fasteners.
Consider measuring bolt preload in critical connections by measuring bolt stretch as opposed to bolt torque. Not sure how to implement this – ideas?
Consider longitudinal damping along the TL section along the Target Hall wall to damp out possible undamped vibrations from electrical pulsing. Using polyeruthane isolators and swinging end-links (see Bill’s talk).
Worry about scratching the silver-plating off the TL “fingers” when clamping/unclamping. Have seen no damage in the silver-plating on the TL fingers out at MI-8 and
they have been connected and disconnected a few times. (more from Jim)
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 19
Response to Recommendations:TL, Remote Clamp, TL Block Review (Feb. 2002)
Flex Joint Comments (joint with slits) No longer using a joint with slits. ANSYS shows we can get sufficient
flexibility with the non-slitted design. Single strip force tests agree with the ANSYS analysis. Testing at MI-8 of the horn1 joint is going well. More from Jim – not specifically part of this review.
Suggest quantitative measurements be made at MI-8 (deflection at specific points, resonant frequencies, etc.) to compare to ANSYS calculations (and any other calculations) and thus support longevity estimates. We are making some quantitative measurements at MI-8 and will compare
measurements with predictions– Jim will talk about this. Concerns abut a tight testing schedule at MI-8 which might be hard to meet if
problems are encountered. Agree. We have encountered problems, testing is tight, and we hope to make it
(more from Jim). Can delay installation of horn PS & continue testing longer. Concerns with human resources – lack of.
This is a constant battle we continue to fight. Suggest pre-assemble entire setup (power supply to horns) at MI-8.
We will do this to the extent that we can.
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 20
Schedule & Concerns
Schedule: MI-8 testing until Horn PS removed for installation.
Test pulsing of horn 1 and horn 2 on test stand.
Task Current ProjectionFNAL Baseline
Date (3/04 running)Complete Design & Drawings of TL 7/15/03 8/15/03
Complete Installation of Horn PS in PS Room (DOE MS L-2-17, 9/1/04) 10/6/03 2/16/04Receipt of all TL parts 11/25/03 3/19/04Start TL Installation 4/14/04 6/21/04Complete TL Intstallatoin 5/11/04 7/21/04Start Horn System Electrical Checkout 10/18/04 11/12/04
NUMI
Internal NuMI ReviewApril 23, 2003
Transmission Line ReviewPage 21
Schedule & Concerns
Specific Concerns: Making sure all bolts on the TL clamps are tighten (and remain tightened)
Checkout checklist item Periodic checks in Target Hall?
QA that clamps are put together correctly If doesn’t look like it is going together well, stop and ask expert. Alignment rods at removable sections
General Concerns: Resources (manpower)
Engineering/drafting to get the design done and parts ordered/made Technicians to get it assembled and installed
Fitting it all in with the target hall shield block installation & Module installation Concerns about damaging the TL parts Final connections of the TL to the horns/PS are near the critical path
The transmission line (and joint) have always been underestimated in their complexity (cost, time to make, problems encountered in installation/testing).