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MRO Delay Line ICD

Metrology System to Beam Combining Facility ICD INT-406-VEN-0012

The Cambridge Delay Line Team

rev 0.4 5 October 2009

Cavendish Laboratory JJ Thomson Avenue Cambridge CB3 0HE UK


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ICD Description
Sub-systems Metrology BCF System Org UoC Owner MF Brief description and preliminary contents Relates metrology bench, services and electronics racks etc to BCF (BCA) area. · Location and requirements of metrology bench · Location and requirements of electronics racks · Service connections, heat removal etc.

ICD Number INT-406VEN-0012

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Change Record

Revision Date Authors Changes 0.1 2007-08-10 MF First draft version 0.2 2009-05-20 MF Major revision to account for choice of Agilent laser. Details of modules, including VME requirements and metrology cabling. 0.3 2009-06-16 MF Revised IP module to Acromag IP470A: p6 Revised utility power requirement to metrology system: p7 Description for powering additional receiver modules added: p8 0.4 2009-10-05 MF Corrected optical fibre code to E1705E on page

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Notification List

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

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Table of Contents
ICD Description ........................................................................................................................... 2 Change Record ............................................................................................................................. 2 Notification List ........................................................................................................................... 2 Scope ............................................................................................................................................ 3 Acronyms and Abbreviations....................................................................................................... 3 Applicable Documents ................................................................................................................. 4 Reference Documents .................................................................................................................. 4 Introduction .................................................................................................................................. 4 Requirements ............................................................................................................................... 5 9.1 Metrology Table................................................................................................................... 5 9.1.1 Metrology table area and location................................................................................ 5 9.1.2 Metrology table height ................................................................................................. 5 9.2 Electronics............................................................................................................................ 5 9.3 Cabling ................................................................................................................................. 6 9.4 Services ................................................................................................................................7 9.5 Thermal loading ................................................................................................................... 7 10 Design ...................................................................................................................................... 7 10.1 Metrology Table................................................................................................................... 7 10.2 Connections.......................................................................................................................... 7 Laser metrology ........................................................................................................... 7 10.2.1 10.2.2 Shear Camera ............................................................................................................... 8 Mirror mount control ................................................................................................... 8 10.2.3 10.2.4 Grounding .................................................................................................................... 8 10.3 Laser cooling ........................................................................................................................ 9 11 Appendix .................................................................................................................................. 9 1 2 3 4 5 6 7 8 9

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Scope

This document describes the interface requirements for the metrology system within the BCF. This includes the size and positioning of the metrology table(s), the accommodation of electronics associated with the metrology system, cabling requirements and services. The layout of the metrology system on the table is not specifically part of this interface.

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BCA BCF BRS DL DLA ICD ICS SCS

Acronyms and Abbreviations
Beam Combining Area Beam Combining Facility Beam Relay System Delay Line Delay Line Area Interface Control Document Interferometer Control System Supervisory Control System MROI Magdelena Ridge Observatory Interferometer UoC University of Cambridge NMT New Mexico Tech OPD Optical Path Delay TBC To be confirmed TBD To be determined

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Applicable Documents

DOCUMENTS

AD1 Top Level Requirements INT-406-TSP-0002 AD2 MROI Delay Line Derived requirements INT-406-VEN-0107
DRAWINGS

AD3 MROI Beam Combining Facility .

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RD1 RD2 RD3 RD4 RD5 RD6 RD7 RD8

Reference Documents
Delay line to Beam Relay system (INT-406-VEN-0008)

Delay line to metrology system (INT-406-VEN-0010) Metrology System to Beam Relay System (INT-406-VEN-0013) Parts list for the MROI Metrology System 5517FL Laser Head User Manual M3 Architectural Dimension Floor Plan AR101 Metrology system drawing set Internal memo (email from T Coleman 2009-05-29)

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Introduction

This ICD describes the facilities and services which the metrology system requires to be provided in the BCF. There are four areas of interface: the metrology table in the inner BCA; the placement of electronics chassis in the outer BCA; the cabling between the electronics chassis and subassemblies on the metrology table; and the services required at the metrology table and the electronics chassis. The size and positioning of the metrology table is closely associated with the delay lines which the metrology system feeds (information on the interface between the delay lines and the metrology system is contained in RD2 and the layout of the components on the metrology table is presented in RD4). Access to the delay line end-plates close to the table and also to components on the table is very important and since space in the inner BCA is limited some further compromise may be necessary e.g. incorporating some of the other optical components required in the BCA on the metrology table. To meet heat loading limitations in the inner BCA (RD8), most of the electronics associated with the metrology system is located in the outer BCA while the laser head, located on the metrology table, is to be ventilated by forced air drawn in from and returned to the outer BCA.


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9.1

Requirements
Metrology Table

9.1.1 Metrology table area and location
A metrology table area of 7.2m minimum by 0.6m minimum is required to support the optical layout for 10 delay lines fed by up to two laser heads. It may comprise several tables but must behave as one monolithic table. Access is required to the front (closest to the delay lines) and rear of the table for adjustment of various optical components and the shear camera. This places a maximum practical width on the optical table of 1.8m.

The distance between the end-plate of each delay line and the nearest edge of the metrology table should not be less than 0.75m. This allows sufficient space for the protection mechanism of the DL science beam exit window to project a further 250mm in front of the end-plate (the surface of which is 100mm from the inside wall of the BCA) thus allowing at least 500mm clear for personnel access to the delay lines or the metrology table. The laser head is to be mounted at the south end of the table but provision should be made for mounting a second laser at the N end of the table if room permits. At least 850mm between the end of the table and the centreline of the nearest delay line is required to accommodate the laser head and branch mirrors.
The metrology table should be positioned at least 600mm from the south wall of the BCA to allow personnel access.

9.1.2 Metrology table height
The height of the table is determined by the height of the metrology beam expander assembly and the incoming science beam height above the BCA floor. The nominal height of the centre of the incoming science beam above the BCA floor is 1.6m. The base of the metrology system is 355mm below this and therefore the nominal height of the top surface of the metrology table is 1265mm above the floor with an allowance of +/-0.25mm for height setting and +/-0.1mm in the table surface error. Adjustment of the height of the metrology table (with a sensitivity of approximately 0.1mm) must be provided as there is no height adjustment in the individual metrology beam expander assemblies.

9.2

Electronics

Rack space in the outer BCA is required for a single 12U height VME crate is required for the metrology measurement system. The parts required for the VME system are listed in RD4 but a portion of the table is reproduced here in Table 1. In addition to the VME power supply at least 13 slots will be required depending on the disc drive and any other peripheral devices/interfaces. Rack space in the outer BCA is required to hold the power supply block for the laser head. The Agilent laser has a power block rather than a rack-mountable module and a second block or 15V PSU will be needed when more receivers are powered. Space is also require to hold up to 10 Agilent receiver modules which receive signal from the remote sensors over optical fibre and convert it to voltages which are then connected to the measurement board. A 3U height unit should be sufficient to house these modules and the power supplies. Rack space of 15U for up to 10 1U height shear camera computer modules with a 0.5U minimum spacing between each is required. They need not occupy the same rack as the VME system nor all be contained in one rack. The positioning of the rack(s) in the outer BCA used for housing the electronics should take into account the available cable tray routes and the maximum cable lengths detailed in the following section. The preferred location of all the electronics is in a single rack located in the outer BCA close to the south end of the metrology table as shown in Figure 1 in the appendix.

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Metrology System to Beam Combining Facility ICD INT-406-VEN-0012 v0.4.doc Table 1 Electronics in the rack positioned in the outer BCA Component Laser head power supply Remote receiver 1 VME system VME card frame VME CPU plus disc drive Measurement board 3 IP carrier board 8-channel D-A IP pack Digital IO IP pack Custom interface board Timing and frequency processor Shear System Shear camera computer
5 2

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No. 1 110 1 1 1-5 1 1 1 1 1

Size 16

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Supplier Agilent Agilent

Part Number 10884B E1709A (13 slot min, with power supply and fan cooling) VP325/022-23U plus options as required 10898A TVME200-10 IP-220A-16 IP470A Drawing set TTM635VME-VCXO APOLLO-ICE-G-P1.8FL-512MAC-NO_O/S Unspecified Unspecified Unspecified

1+2 1 1 3 1 -

Concurrent Technologies Agilent TEWS Acromag Acromag Cambridge Symmetricom Eurotech

1

Keyboard 1 Monitor 1 KVM switch 1 Notes:1 One needed for every delay line. 2 Number depends on how many receivers are powered 3 One needed for every 2 delay lines. 4 Indicates module width for VME modules
5

VME cards are also available with on-board disc drives. Alternatively modules are available with disk, DVD, floppy and other interfaces as required.

9.3

Cabling
Table 2 Cabling between metrology system components.

Cabling between components on the metrology table and the electronics rack(s) is identified here in Table 2.

Source (Met Table) Interferometer remote sensor

Destination (Outer BCA) Remote receiver

Function Measurement signal Measurement signal

No. 1-10 1-10 1 1 1-10

Cable Type Agilent E1705E opt 400 Agilent N1250A Agilent 10881C Agilent 10881C Firewire
1 1

Maximum cable length 20m 5m 20m 20m 10m plus 4.5m repeater as required

Laser Head Laser Head Shear Camera

Remote receiver to VME System measurement board VME System Reference measurement board signal Power supply and control Shear Cam Shear image Computer

Notes: 1 This is a single cable combining power supply and reference signal (see appendix)

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9.4
· · · · · ·

Services

The following services are required for the metrology system: Utility power for the VME rack Utility power for up to ten shear camera computers each fitted with 180W power supply. Utility power for the Laser head and receiver module power supplies 200W One network socket at the metrology table. (Gigabit Ethernet recommended for displaying shear camera images) Ten network sockets for the shear camera computers. (Gigabit Ethernet recommended) Ducting/cable trays for connections between metrology table and equipment rack(s)

9.5

Thermal loading

The laser will dissipate 35W while warming up but approximately 23W while in normal operation. A significant proportion of this heat should be removed to meet the dissipation requirement of no more than a total of 20W [TBC] apportioned to the metrology system within the inner BCA (RD1 & RD2). Each shear camera will dissipate less than 1W and no explicit cooling will be necessary. Air cooling for the laser head (RD5 and Figure 6) is required to be a minimum of 4m/s at the 50mm diameter exit port, at ambient temperature, to remove 80% of the power dissipated in the head.

10 Design
10.1 Metrology Table
The optical layout of the metrology system provides for ten channels of metrology from a single laser which is placed at one end of the metrology system. Provision for a second laser at the other end of the table should be made in case one is required to maintain sensitivity of the measurement system. This requires a table area which is long and narrow though the width could be increased to a standard size or more, if needed to accommodate other BCA optics, but in any case no more than 1.8m. The layout of the laser metrology system for the ten delay lines is described in RD4.

The distance between the inside of the south wall of the BCA and the centre of the first delay line pipe is 5 feet 11 ѕ inches i.e. 1.82m (according to the architectural drawing given in RD6). The
preferred placement of the optical table along the N-S direction is such that there will be a 0.9m space between the inner BCA wall and south end of the metrology table. This provides a distance of 920mm between the edge of the table and the centre of the first delay line pipe (accommodating the 850mm minimum requirement) and allows for cables from components on the table to be routed into the cable tray directly above that end of the table. The diagram in Figure 1 in the appendix shows the laser mounted at the S end of the table and the dimensions for positioning the table. The layout drawing for the metrology bench within the BCF is available (AD3).

10.2 Connections
The connections between metrology components are listed in Table 2. Each cable is described in more detail in this section.

10.2.1

Laser metrology

The laser head cable carries both the power supply to the head and the laser reference signal from the head. The cable is 20m long and has a single connector at the laser but splits into to connectors at the other end. See Figure 3 and Figure 4 for how the cable is connected. The remote sensor is not shown in Figure 3 but connects to the remote receiver using a 20m glass optical fibre. The remote receiver is connected to the VME measurement board using a 5m cable. Agilent require that the receiver modules are powered by +15V which

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is supplied via the measurement board to which they connect however the measurement board itself does not provide this power, it is sourced externally and a suggested arrangement is outlined below. A specially configured front panel ribbon cable is required to carry the reference signal from the first measurement board to each of the other measurement boards in the system. It is not recommended to carry the +15V supply to other measurement boards using this cable because the laser head power supply can only supply two measurement modules at most when a 20m laser head cable is used. Therefore a different power supply arrangement is required for supplying power to receivers via their measurement boards. The measurement board does not supply the +15V however but all reference and signal input connectors (as well as the front panel ribbon cable link which carries the reference signal to other measurement boards) have this power connection bussed. Provided one of the two front panel reference signal connectors (dual measurement board) is supplied with +15V then a receiver module plugged into either or both channels will be powered. The first two receivers get power from the first measurement board via the reference signal cable from the laser head. Further receivers are powered from their respective measurement boards provided one of the other reference input sockets is supplied with power from the local +15V power supply in the rack. It is suggested that this additional +15V power supply provides power to each additional measurement board via an individual cable which is plugged into one of the reference channel cables. The power supply should be sized to provide 2.5A at +15V ±1V (for up to 8 receivers which each take <270mA).

10.2.2

Shear Camera

No allocations are made but it should be noted that the shear camera fire-wire cable length is limited to 20m for superior cable. If standard cable is used the limitation becomes 10m. Use of a repeater allows an additional 4.5m of cable to the standard 10m length. The repeater draws power from the fire-wire cable and therefore it would be undesirable to use more than one repeater per cable. Cable trays are approximately 2.5m above floor level and therefore cable length from the table surface to a tray directly above (if one is available) is approximately 1.25m. The distance of the furthest shear camera from the south wall is nominally 7.6m. Allowing the cable to rise and travel through the wall by the shortest route and then fall to the same level implies a further 3m length making the total minimum length for this run 10.6m.

10.2.3

Mirror mount control

There is no cabled arrangement envisaged for controlling the motorised mirror mounts which are incorporated into the metrology beam expander blocks. A handset may be plugged into the mirror mount to be adjusted. If remote operation from outside the BCA is desired then further cabling and interfacing would be necessary.

10.2.4

Grounding

In `Chapter 3 System Design Considerations' of the Agilent Laser User Manual on laser measurement systems, a subsection entitled `System Grounding' describes the grounding practise that should be adopted. This section is reproduced in Figure 8. The body of the laser will be connected to the metrology table while the receiver modules will be mounted in the rack containing all the other metrology electronics. This arrangement should be sufficient to comply with the grounding advice but if local regulations require that the metrology table be grounded then an earth loop will be created which may affect the signal to noise in the system. If explicit grounding of the metrology table is required then the best method would be to route that ground with the laser head cable and connect it to an earthing point in the metrology rack. In this way the loop area is minimised and it is unlikely that any other currents can flow through this earth link. Alternatively the laser head mounting plate could be electrically isolated from the table using very thin insulating film.

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10.3 Laser cooling
To prevent uncontrolled air exchange between inner and outer BCA an insulated enclosure will be placed over the laser head and air introduced into it so that it can enter the cooling ports of the head. The exit port of the laser will connect to the outside of this enclosure to ensure that air is forced through the laser head. A conduit system to bring air from the outer BCA into the laser head enclosure and remove it again is to be installed above each laser location at either end of the optical table. The interface details for this enclosure are yet to be determined. [TBD]

11 Appendix
Figure 1: showing the minimum size and preferred position of metrology table. Figure 2: showing the relationship of the metrology table surface to the incoming science beam height and the nominal metrology table height above the inner BCA floor. Figure 3: the Agilent single channel cabling arrangement Figure 4: the Agilent 10881C laser head cable
Figure 5, 6 & 7: Specifications for the Agilent 5517FL and 5517GL laser heads. Figure 8 System Grounding considerations

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INNER BCA SOUTH WALL

N

ELECTRONICS RACK (Preferred location)

0.6m min 0.6m min

7.2m min

BEAM EXPANDER BLOCKS

METROLOGY BENCH LASER HEAD DELAY LINES 0.75m min

OUTER BCA Figure 1Placement of metrology table in the inner BCA


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Figure 2 Position of the top surface of the metrology table with respect to the incoming science beam height (355mm) and the nominal dimension for the metrology table height above the inner BCA floor 1265mm (extracted fromAD3) .


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Figure 3 The Agilent cable arrangement for laser head, power supply, receiver and measurement board. The remote sensor is not shown but connects to the receiver via an optical cable. The Agilent power supply block and the receiver module(s) are to be located in the outer BCA.

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Figure 4 The Agilent 10881C Laser head cable.

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Figure 5 Specification sheet for the Agilent 5517FL laser head

Figure 6 Specification sheet for the Agilent 5517GL laser head. The laser dissipation is expected to be the same as the 5517FL laser head.

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Figure 7 Specification sheet for the Agilent 5517GL laser head showing laser dimensions. Note that a different mounting arrangement will be used so the three feet shown here will be removed (see RD7).

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Figure 8 Extract from Agilent Laser System User Manual

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