Transmission Line TL Review

1
Transmission Line (TL) Review

• WBS 1.1.3 Power Supply System
• Transmission Line (TL) Review
• Nancy Grossman
• FNAL
• April 23, 2003

2
Outline

• 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

3
Scope and Conceptual LayoutTarget 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.

REMOVABLE 28 SECTION
REMOVABLE Z-BAR
ROCK WALL BETWEEN PS ROOM AND TARGET HALL- 23
REMOTE CLAMP
HORN 1 JOINT
REMOVABLE Z-BAR
REMOTE CLAMP
HORN 2 JOINT
4
Scope and Conceptual LayoutTarget Hall
Transmission
5
Scope/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_at_fnal.gov within a week.

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MI-8 Fingers, Remote Clamp
Remote clamp plugged in _at_ MI-8
Horn 1 joint/electrical plug _at_ 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
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Joints and Remote Clamp
Horn 1 joint, remote clamp at MI-8
Horn 2 joint in machine shop (now done)
8
Overall Specifications/Concerns

• 1. Lifetime
• Part of stripline connected to horn will be
  replaced each time a horn is replaced, gt1 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 years
• 2. 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.

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-bars at top of module/block.
  Allows replacement of horns.

10
Transmission Line Through the Block
11
Transmission Line Through the Block
( figure slightly out of date )
12
Transmission Line Through the Block
13
Transmission Line Beyond the Shielding
14
Transmission Line Beyond the Shielding
15
Transmission Line Beyond the Shielding
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Transmission Line Through the Rock Wall
17
Transmission Line Through the Rock Wall
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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 Bills 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)

19
Response to RecommendationsTL, 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.

20
Schedule Concerns

• Schedule
• MI-8 testing until Horn PS removed for
  installation.
• Test pulsing of horn 1 and horn 2 on test stand.

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 doesnt 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).