IceTop Miscellaneous Notes

Nobuyoshi Kitamura

IceTop DOM Assembly Week (October 13-17, 2003)

• The DOMs are XE3P0010, XE3P0014, XE3P0015, XE3P0016 (detailed record to be added to this page).
• The HV Control Board is of Rev C design.
• The DOMs have a "second penetrator" to allow firmware programming after the Tank deployment.
• The Main Board transformers, T2 and T3 (T3-1T-KK81), have been replaced by T2-1T-KK81.  The new transformers now expect the local coincidence cable to have a characteristic impedance of 150 Ω.  The "new Ericsson" 9mm quad cable has a characteristic impedance of 142 Ω, which is in an acceptable range.
• The Main Board jumpers must be set correctly.  See diagram below.  Since there will be only one DOM per twisted pair, each DOM must be of 'A'-type and be correctly terminated.
• The attachment of the penetrator cables to the Main Board should use wire posts, since access to the bottom side of the Main Board is limited due to the presence of the Delay Board.
• The top half of the mu-metal grid will be from the old hemisphere design.  It will be attached to the bottom half using cable ties.  If the installation is difficult because of the out-dated mechanical design, the top half may not be installed.  Whether the mu-metal grid (bottom or bottom/top) is to be grounded this time is (TBD).
• The DOMs will be sealed with clean dry nitrogen.  The Main Board pressure sensor will be read out using a DOR card.
• The four DOMs will be shipped in a single Hardig box.  Cables, etc. will be shipped in an additional Hardig box.

Production Check List (To be refined)

• Hardware subassemblies
• Software/firmware
• Electrical connections
• Mechanical
• Functional tests
• Records
• Shipping

Updates (October 24, 2003)

• The DOM shipment has been delayed in order to incorporate a number of "fixes" to the DOMs.
• Some DOMs developed a pressure leak.
• The Main Boards did not reboot at cold temperature, which has apparently been fixed by slowing down the clock frequency.
• Several thermal insulation schemes are being experimented to increase the temperature of the Main Board. (see DOM Insulation Experiment Homepage)
• A number of rework job are needed on the Main Boards (See below).

Shipment (October 31, 2003)

The four DOMs were finally shipped out of PSL on October 31.  For the description of the DOMs with complete test data, see http://www.amanda.wisc.edu/krasberg/icetop/engineering_shipment.html.

The first penetrator and the second penetrator are marked as "MAIN" and "JTAG" on the DOM.  Note the markings, since the installation of the penetrator is not uniform among the four DOMs.

The cables were cut from a spool of 0.9mm Ericsson quad into the following segments and wound on a smaller spool (approx. 16" diameter) in the following order:

List of Items Shipped on October 31

1 Hardigg Box containing

• 4 DOMs (XE3P0010, XE3P0014, XE3P0015, XE3P0016)
• Documentation
• 1 Roll of "Monkey Dung"
• Holiday greetings and candy bars

1 Cardboard Box containing 0.9mm Ericsson quad cable cut into the following lengths

• 2 x 500'
• 4 x 150'
• 2 x 50'

The cable segments have been wound on a small spool (approx. 16" diameter) in the order listed above.

Note     The following items will be shipped on around December 1:

• 1 DOM Hub computer
• 1 120V, 200W, Agilent power supply
• 2 DOR cards

Main Board Hardware Rework

 The following changes have been made  to the Rev 2 Main Board.    For further instructions on items 8, 10, 11 and 12, see http://rust.lbl.gov/~gtp/DOM/Rev2/Rev2B.html.  For item 8, there is further specific instructions here.

Main Board Firmware Changes

See http://www.amanda.wisc.edu/kaeld/icecube/domtest.  This page has a link to the exact firmware files that were loaded into the DOMs.

The Penetrator Connections

• Cut the unused yellow pair on the external side and cover the stub with a boot.  Cut the corresponding internal green wire and black wire.
• Each of the penetrator cables on the external side is to be 3m in total length.  A segment of the same kind of twisted pair is added to each cable by soldering and then covering with adhesive-lined heat-shrink tubing (3M EPS-200).  Each end of the cables is terminated with a U-shaped lug in order to facilitate ease of handling at the Pole.
• The internal drain wire will be connected to the Main Board ground at pin #2 of JP11.
• The length of the internal penetrator cables should be as short as possible (length TBD).
• Cover the internal cable bundle with a heat-shrink at the point where the individual pairs break out, so that the Mylar foil will not cause a short.

Wire Posts for Connections to Main Board

The Main Board Jumpers

The "Second Penetrator"

The second penetrator is used for programming the DOM firmware at the Pole.  A cable driver for the ByteBlaster (JTAG) cable is added in an empty area of the HV Control Board to cope with the extended length of the programming cable.  (The HV Control Board for this purpose is designated as "REV C".)

This diagram shows the second penetrator wire connections.  The second penetrator makes connections to the pads on the HV Control Board.  The drain wire of the second penetrator is left unconnected.

Schematic diagram for the HV Control Board Rev C.

EAGLE CAD files for the HV Control Board:     HVM_C_eagle.zip

PCB Gerber files for the HV Control Board:       HV_REV_C.zip

Local coincidence connections.  The wire connections internal to the DOM are identical for each DOM.  The following diagram shows the external connections.

The IceTop Tank Drawings from Bartol

Breakout Box and/or Barrier Blocks installation diagram (to be posted here)

The tank cable lengths diagram

The Breakout Box

Wiring Diagrams

Wiring of the two tanks (four DOMs)

Eagle CAD files

 

The Box

There will be a breakout box for each IceTop tank.  Tentatively, NK has selected the following:  Newark cat# 90F9596 (Hammond Manufacturing 1414PHI), steel with a hinged door, 10" x 8" x 4" (panel size 8.75" x 6.88").  See photo.  See catalog page.

The following diagrams will be placed in the breakout box mounted on the outside of the IceTop tank:

Diagram for Tank1 breakout box

Diagram for Tank2 breakout box

 

The Barrier Blocks (Digikey part number CBB112-ND).  Two of these will be placed in each of the breakout box.

IceTop Photos from the Pole