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Infrastructure

This page contains information relating to WP76 infrastructure issues. Appendix B of the computing TDR is derived from the information presented. The following topics are highlighted:

  • Networks (IT)
  • Timing (DAQ, machine protection and femto-sec) fibres
  • Experimental hall balcony rooms (UG01/28, 29, 30, 38)
  • Tunnels (XTDs)
  • Experiment and laser hutches
  • Cable and fibre routing and tray definitions

The current status of each topic is described at the beginning of each section.

Network infrastructure

The 2009 definition of the required IT networks for WPs 73, 74 and 76 is documented in Appendix B of the computing TDR. These definitions have been derived from discussions with DESY-IT and have been inserted into the 2009 room book definitions. In a nutshell: the Schenefeld site network distribution points are provided by IT racks in the experimental floor balcony rooms. Fibre routing (rooms to beamlines, rooms to rooms, rooms to hutches, and rooms to lab) is facilitated via wall breaches and cable trays. Schenefeld and the DESY compute centre are connected via fibres running through SASE1-XS1-XTL.

Timing infrastructure

Fibre networks required for distributing: DAQ timing clocks and messages (to detectors and diagnostic systems), Femto-Second timing clocks (to laser systems), and Machine Protection System signals (to all systems driving/receiving beam line safety information) were reviewed at three meetings held in Dec 2009 and Jan 2010. A proposal for the networks required was provided by H.Schlarb and K.Rehlich.

The number and locations of connections required by Photon Beamline Systems has been specified to the Fibre Network sub-committee (E.Negodin, H.Schlarb, K.Rehlich, K.Ohrenberg, Th. Witt and C.Youngman), see below. No concluding document describing the aimed at implementation has been generated - apparently because there are no immediate requirements to do this based on the definitions outlined in the 25.1.2010 minutes, the input from KR and HS and the PBS requirements email.

The number of 24 fibre cables (contains fibre pairs for: DAQ, Femto-Sec, MPS, redundancy...) required for the photon beam line systems is: from the XHEXP1 distribution point = 30 + 2 + 5 = 37, and from the XS1 distribution point = 17, i.e. a total = 37 + 17 = 54. Note that two distribution points are required as the MPS signals cannot, due to signal loss in the additional length, be sent to Schenefeld and the distributed back into the tunnels, this would be the preferred solution.

This distribution point totals quoted contain the requirements for DAQ, beam line and diagnostic WPs. A detailed breakdown of the numbers is: XHEXP1 experiment hutches: 2 cable per hutch (one DAQ one diagnostics), 5 beam lines, and 3 experiment hutches per beam line, i.e.
total = 30 cables. For XHEXP1 laser hutches: 2 laser hutches, i.e. total = 2. XHEXP1 spares: 5 spares for experiment and laser hutches, i.e. total = 5. XTD Tunnels: 12 diagnostic rack groups (SASE1=3, SASE2=3, SASE3=2, U1=2, U2=2), i.e. total = 12. XTD spares: 5, i.e. total = 5.

Experimental hall balcony room infrastructure

The 2009 definition of the required XHEXP1 balcony rooms infrastructure has been documented in Appendix B of the computing TDR. This information is derived from the detailed implementation description on 22-May-2009, see below, which was finalized with services groups involved. The implementation described has been condensed into the definitions required by the room book. Note that balcony rooms provide the principle distribution point for all fibres/cables distributed between tunnels, hutches and labs. The XS1 distribution point for timing signals is the only exception to this.

Tunnel infrastructure

The 2009 definition of the required XTD tunnel infrastructure has been documented in Appendix B of the computing TDR. This information is derived from the detailed implementation description, see first two items below, with WPs 73, 74 and 76. The implementation described has been condensed into the definitions required by the room book.

Experiment and laser hutches

A list of requirements, leading to an implementation document, need to be provided.

Cable and Fibre routes and trays

Cable/Fibre tray requirements for WP 73, 74 and 76 were defined in 2009 whilst preparing the room book definitions. Prepared means that extensive discussions were carried out with all the DESY service groups involved. The result was that one cable tray per XTD tunnel would be used for control and IT fibres and cables by the WP listed above. This cable tray is one of the trays foreseen by MKK (3 or 6 per tunnel depending on whether the tunnel supplies a beam dump). Jan Havlicek and the MKK group are the people specifying the cable tray required and the anchors.

Some notes/observations:
1. The timing fibre currently being discussed (DAQ, Femto-Sec and MPS) will also fit in the cable tray provided by MKK.
2. The tunnel cables trays link to XHEXP1 balcony rooms through wall breaches and chicanes
3. The cable trays in XTD tunnels link to each other, e.g. XTD6 to XTD1 and so on through the balcony rooms and balcony room interconnection cable tray running above the balcony walkway.
4. The cable trays must run to XS1 past the undulator sections. The undulator group WP 71 should also be providing cable tray information requirements.
5. Connections to and from the cable trays will be required in those regions of the tunnels where WP 73, 74 and 76 equipment is located. The number of connections is not large, see documents we provided to backup the room book request, and should be planned in detail closer to the final installation date.
6. In the event of additional cable tray usage requirements to interconnect instruments within a rack group the planning for the ~50m of tunnel effected can also be made later.
7 Diagrams, per XTD, showing who uses which cable tray and how much of it should be provided. This might show that cables for emergency systems, lighting, telephones, etc. have also to be included.