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Delay Line to Beam Relay System ICD INT-406-VEN-0008 v0.2.doc

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MRO Delay Line ICD

Delay Line to Beam Relay System ICD INT-406-VEN-0008

The Cambridge Delay Line Team

rev 0.2 28 May 2009

Cavendish Laboratory JJ Thomson Avenue Cambridge CB3 0HE UK


Delay Line to Beam Relay System ICD INT-406-VEN-0008 v0.2.doc

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ICD Description
Sub-systems Delay line Beam Relay system Org MRAO Owner MF Brief description and preliminary contents Defines the mechanical interface between the delay line pipe and the beam relay pipe. · Requires one drawing of the specified flange arrangement. · Requires drawing of allowable space envelope for the beam relay pipe.

Specific entry from the ICD N2 Table contained in FDR document:

ICD Number INT-406VEN-0008

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Change Record

Revision Date Authors Changes 0.1 2007-08-10 MF First draft version 0.2 2009-05-28 MF Final interface design

Notification List
The following people should be notified by email that a new version of this document has been issued: MROI: Fernando Santoro MRAO: Chris Haniff David Buscher Martin Fisher

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Delay Line to Beam Relay System ICD INT-406-VEN-0008 v0.2.doc

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Table of Contents
1 2 3 4 5 6 7 8 9 10 ICD Description ........................................................................................................................... Change Record ............................................................................................................................. Notification List ........................................................................................................................... Scope ............................................................................................................................................ Acronyms and Abbreviations....................................................................................................... Applicable Documents ................................................................................................................. Introduction .................................................................................................................................. Requirements ............................................................................................................................... Design .......................................................................................................................................... Appendix .................................................................................................................................. 2 2 2 3 3 3 4 4 4 4

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Scope

This document details the flange fitting requirements for the beam relay pipe. It does not describe nor detail the replacement science window.

5

Acronyms and Abbreviations
MRAO Mullard Radio Astronomy Observatory NMT New Mexico Tech OPD Optical Path Delay TBC To be confirmed TBD To be determined

BCA Beam Combining Area BCF Beam Combining Facility BRS Beam Relay System DL Delay Line DLA Delay Line Area ICD Interface Control Document ICS Interferometer Control System MROI Magdelena Ridge Observatory Interferometer

6
AD1

Applicable Documents
Drawing MROI-125 `Coupling pipe section'

REFERENCE DOCUMENTS

RD1 RD2 RD3 RD4 RD5 RD6 RD7 RD8

Delay line to BCF infrastructure (building) (INT-406-VEN-0009) Delay line to metrology system (INT-406-VEN-0010) Metrology System to BCF (INT-406-VEN-0012) Metrology System to Beam Relay System (INT-406-VEN-0013) BCF Area (M3 architectural drawing (AR100) MROI Beam Combining Facility (Delay Line Metrology System) MROI Infrastructure (Delay Line System) MROI Delay Line Near End-Plate drawing set 3


Delay Line to Beam Relay System ICD INT-406-VEN-0008 v0.2.doc

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Introduction

The interface between the delay line pipe and the beam relay pipe resides on the end-plate of the delay line pipe closest to the metrology system. The beam relay pipe connects to end-plate at a flange arrangement around the upper science aperture. The flange arrangement allows for removal of the beam relay pipe and its temporary replacement with a science grade window to allow the delay line to be evacuated and operation to be resumed. The temporary window will have a compatible flange fitting and will also be fitted with a fail-safe closing device to protect the delay line in the event of a catastrophic window failure. The beam relay pipe should incorporate a compliant coupling somewhere along its length to ensure that: 1. Undue stresses due to thermal expansion/contraction of the beam relay pipe or the length of delay line pipe between the anchor and the BCF area are not transmitted to the delay line. 2. Vibrations, which may be induced in the beam relay pipe from disturbances outside the building, are sufficiently rejected.

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Requirements
1. The interface flange on the DL end-plate should be of sufficient diameter to accommodate the six inch diameter beam relay pipe without obstructing the returning science beam or fouling the science beam or metrology window mounts. 2. The method of coupling the BRP to the DL interface flange must provide good vacuum sealing whilst allowing the pipe to be easily unbolted, removed and replaced by the protective window. 3. There should be sufficient access to the interface area to allow personnel to uncouple the pipe without disturbing the metrology system on the optical table which is immediately below the pipe and in front of the DL pipe. This requirement also impinges on other ICDs described in RD1, RD2, RD3 and RD4.

The requirements of the interface are:

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Design

The beam relay pipe is to be connected via a flexible coupling to a flanged pipe which mounts onto the delay line end plate. The details of this coupling are given in the drawing AD1. When the beam relay pipe section is removed the flanged coupling is also removed and a science window is fitted to the end plate in its place. A fast-acting valve, similar to the one on the lower science window is also mounted is also mounted over the upper science window. The designs for these items are given in RD8. The layout of beam relay pipe with respect to the metrology system is given in RD6 and RD7.

10 Appendix
Drawing MROI-125 `Coupling pipe section'

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2

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Material: Aluminium 6061

Tolerances unless stated:
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Drawn by: DS Title:

Date: 14/05/09

Quantity:

1

Drg. No. MROI-125

A

University of Cambridge, Department of Physics

Coupling pipe section MROI
Scale:

CAVENDISH LABORATORY 6 5 4 3 2

Project:

1:4

Size: A4

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