APPROVAL SHEET. TITLE : Prime Focus Image Spectrograph (PFIS) ICD of the Southern African Large Telescope (SALT)

Transcription

1 APPROVAL SHEET TITLE : Prime Focus Image Spectrograph (PFIS) ICD of the Southern African Large Telescope (SALT) DOCUMENT NUMBER : 1520AS0002 ISSUE: 3 SYNOPSIS : This document describes the Interface between PFIS and various subsystems of the Southern African Large Telescope (SALT). KEYWORDS : ICD, PFIS PREPARED BY : Leon Nel APPROVED : Gerhard Swart SALT System Engineer Leon Nel Tracker & Payload Manager DATE : March

2 This issue is only valid when the above signatures are present. 2

3 ACRONYMS AND ABBREVIATIONS mm arcsec VI CCD Deg PM MMI SDSU PFIS RA, DEC SALT TBC TBD TCS Micron Seconds of arc Virtual Instrument Charge-coupled Device (Camera) Degrees Primary Mirror Man-Machine Interface San Diego State University Prime Focus Imaging Spectrograph Right Ascension and Declination Southern African Large Telescope To Be Confirmed To Be Determined Telescope Control System 3

4 TABLE OF CONTENTS APPROVAL SHEET... ACRONYMS AND ABBREVIATIONS... TABLE OF CONTENTS Scope Identification Interfaces PFIS PFIS Detecter Computer <-> TCS Server (1e) Electrical Data PFIS <-> Electrical Power (2e) PFIS <-> Glycol and Air Supply (3e) PFIS Structure <-> Tracker Rotation Stage 4e Physical Constraints PFIS Structure <-> Guidance Probe 5e Physical TOP HEX Cooler Box <-> TOP HEX 6e Physical PFIS Cooler Boxes <-> PFIS Structure 6e Physical Layout of igloo behind Primary Mirror Cable List Appendix A Appendix B... 4

5 1. Scope 1.1 Identification This document describes the interface between PFIS and the various subsystems of SALT. The subsystems are: a) Tracker rotation stage b) Guidance Probes c) SALTICAM (slit image) d) Igloos behind Primary Mirror e) Cooler Boxes on TOP HEX f) Cooler boxes for electronics on PFIS g) Computer Room h) Control Room i) Glycol and air Supply j) Electrical Power 5

6 2. Interfaces 2.1 PFIS The PFIS can be divided into the following major components that will have interfaces with the Payload Structure and or other parts of SALT: Cooler Boxes on PFIS, enclosing all PFIS electronics Structure (Which will mount onto Tracker Rotation Stage) Cryocooler (mounted in a cooler box behind the Primary Mirror-called the Igloo) PFIS computer (Located in control Room) PFIS Man Machine Interface (MMI) display and controls, called from any computer on the network Note: A cryocooler will also be required for the commissioning instrument. If possible both the PFIS and Commissioning instrument can use the same one. The following schematic diagram shows the location of the various PFIS subsystems and interfaces. Interfaces are numbered and will be discussed subsequently (i indicates internal and e external interfaces) FACILITY Control Room Telescope Chamber PFIS MMI Display & Controls Computer Room PFIS Computer 1 TCS Server e Electrical Room Normal, UPS Power Isolators Electronics Utilities Building Glycol Compressed Air 2i 1i 2 e Telescope Structure 3 e 6e Cooler Boxes (TOP HEX) 4i Igloo(PM): Cryocoole r 3i Tracker Rotation Stage: 4e PFIS 5e Guidance Probe Structure 5i 7e Cooler Boxes SALTICAM (PFIS, Star Tracker) 6

7 Figure 1 The subsequent sections will describe the various external interfaces of PFIS PFIS Detecter Computer <-> TCS Server (1e) ELECTRICAL a) Network connection 1) Connectors 2) Electrical wiring details 3) Distance b) Precise Time Signal(TBC) 1) Connectors 2) Electrical wiring details 3) Distance DATA a) Health status information (TBD) b) Commands for slit alignment (TBD) c) RA and DEC (TBC) (DATA ICD???) PFIS <-> Electrical Power (2e) a) Power Supply UPS Power (SALT) 220VAC, 15A, single phase Isolator Switch 1 Igloo behind Primary Mirror (D) PFIS Miscellaneous Cryocooler Essential Power (SALT) 220VAC, 20A, single phase Cooler Box at TOP HEX Isolator Switch 2 PFIS Power Distribution Panel Isolator Switch 3 PFIS Power Supplies Cooler Box on PFIS -PXI Chassis -PXI power supply -Stepper power supply -SDSU power supply -SDSU Array Controller -CCD Ion pump Contr Doc No. -CCD SALT- Vac 1520AS0002 Gauge 7 Contr -Star Tracker Base

8 UPS CCD (SALT) 220VAC, 10A, single phase Isolator Switch 4 PFIS Power Switches Etalon Controller Figure 2 NOTE: SALT to Supply Power up to Isolator Switches, from there it is the responsibility of PFIS See Tracker Payload Electrical interface diagram in Appendix A b) Cable Routes to TOP HEX and Igloo behind Primary Mirror Distance Distance[m] Marker S S S Figure 3 8

9 S S S S c) Cable List See cable list table (page14) PFIS <-> Glycol and Air Supply (3e) a) SALT to supply glycol to cooler boxes and Igloo. b) Clean air supply: Outlet supplied by SALT on Payload 1) Flow rate 3l/min 2) Pressure 6bar (+-1) c) Normal air supply: Outlet supplied by SALT on Payload 1) Flow rate 3l/min 2) Pressure 6bar (+-1) d) Layout and connector drawings: TBD e) Maximum Cooling Capacity Available to PFIS: 1.3Kw 9

10 Note: 3) The system specification requires that no subsystem in the optical path should: have a surface temperature of more than 8degC above ambient. have forced-air cooling which is exhausted into ambient dissipate more than 4Watts continuously to ambient, if so the item must be housed within an enclosure from which heat will be removed by the Glycol system 4) The system specification requires that no subsystem outside the optical path should: have a surface temperature of more than 8degC above ambient. have forced-air cooling which is exhausted into ambient dissipate more than 6.5Watts continuously to ambient, if so the item must be housed within an enclosure from which heat will be removed by the Glycol system PFIS Structure <-> Tracker Rotation Stage 4e Physical 10

11 a) PFIS Tracker Rotation Stage interface drawing X Focal Plane Z Figure 4 See next paragraph for an explanation of the coordinate system. See Appendix B for complete mechanical Tracker Payload Interface. 11

12 b) PFIS Orientation relative to SALTICAM The picture below shows the telescope configuration in V I mode. The coordinate system is centred on the PFIS focal plane. The sky is in the negative Z-direction. SALTICAM will be mounted in the YZ plane (below the star tracker head in the figure below), with the PFIS slit coincident with Y. The fixed mounting point of PFIS and the structure carrying SALTICAM will be on X. +Y is at a nominal elevation (relative to local horizon) of 37. Star Tracker Electronics Star Tracker Head Figure 5 See PFIS figure 6 shown in ACSI mode page 11 12

13 Y: Up the Tracker Rail Pinned Foot X SALTICAM Slotted Foot Readout/Drift Scan direction PFIS Slit SALTICAM Constraints Figure 6 a) Mass of PFIS < 500kg (including Infra Red Beam) b) Volume above prime focus: (i) Diameter : 3.0m (ii) Height : 1.5m 13

14 c) Centre of Gravity in a cubic volume of less than 10x10x10cm, centred less than 65cm above the focal plane. d) Structural stability of mechanical mounting points (under all loading and environmental conditions): (i) Stability of mounting points relative to one another, in z-direction, should be less than 10 microns. (ii) Global tilts relative to optical axis shall be less than 100 arc seconds (iii) Movement in focus direction shall be less than 100 microns e) Accessibility (i) Slit mask replacement once a week (ii) Filter wheel replacement once a month f) Adjustability: The PFIS structure shall provide mechanisms to adjust alignment with the focal plane and optical axis. This means 5 degrees of freedom adjustability, x, y, z, tip and tilt. The ranges to provide for is as follows: (iii) X, Y >= 3mm (iv) Z >= 2mm (v) Tip and Tilt >= 0.3 degrees PFIS Structure <-> Guidance Probe 5e PFIS interface plate Physical 14

15 Drill & Tap M8 x 20mm Deep (4 O PFIS SUPPORT POSITIONS (4 off) GUIDANCE PROBE AREA FOCAL PLANE PFIS INTERFACE PLATE SURFACE FLATNES TO BE WITHIN 10 Figure TOP HEX Cooler Box <-> TOP HEX 6e Physical a) Dimensions of packaging space required by PFIS: 480 x 380 x 270mm b) Cooling Capacity required: TBD c) Interface between Cooler Box and electronics Frame: TBD d) The figure below depicts the layout on the top hex. 15

16 1214AD001 Rail Beam Assembly Top Hexagon Assembly Front View Side View Manifold (Air) Pfis Tracker Box-1.6m wide Manifold (Glycol) Power & Data Plugs Air & Power flow direction Glycol & Data direction Space for cables Items to go on top hex 1. Electrical DB box (220v + UPS) 2. Glycol manifold (fluid return) 3. Air manifold (normal + clean) 4. Pfis Electronics enclosures 5. Tracker Electronics Enclosures 6. other? - Payload? - Estop? Gap for cable access Outstanding issues 1. Sizes of manifolds 2. As build clearance between catwalk and top hex. 3. Means of filling door onto Igloo General 1. Gable routing under the beam 2. Leave space at the ends for cable 3. Transition from uprights to horizontal FARIED 4. DB box can be placed around the side of the beam if space is a problem. 10/09/02 Figure PFIS Cooler Boxes <-> PFIS Structure 6e Interfaces for RRS Proposed Rail Beam Ass. 1214AD001 A Physical a) Dimensions of packaging space/s required by PFIS: TBD b) Cooling Capacity required for each: TBD c) Interface between Cooler Box and electronics Frame: TBD Layout of igloo behind Primary Mirror Figure 9 16

17 2.1.9 Cable List Purpose Cable Source Cable Destination No cores Length (m) Description Cable OD Supplier Electrical Computer PFIS Computer Room UPS Room SALT Electrical PXI AC Room UPS PFIS(Igloo) PFIS Motor Ac Electrical Room UPS PFIS SALT/PFIS Leach Electrical Room UPS Controller (Special) PFIS (Vis) SAAO/PFIS Fiber Optic - Leach Controller SAAO PC Computer Room PFIS (Vis) Fiber 5 PFIS Fiber Optic - PXI Chassis PFIS PC Computer room PFIS Fiber 5 PFIS PFIS PC Computer room RS232 - Etalon Controller Top Hex (Vis) Fiber 5 PFIS Queens gate: xyz Top Hex PFIS (Vis) 3 26 Coax 20 PFIS Queensgate: HV Top Hex PFIS (Vis) PFIS Queensgate: Electrical Top Hex AC Room UPS (Vis) PFIS/SALT Star Tracker Head Payload Payload PFIS 17

18 Electrical Star Tracker AC Room UPS Payload PFIS/SALT Star Tracker Video Payload Computer Room Fiber(COAX?) 5 SALT Star Tracker Ethernet Payload Computer Room Fiber 5 SALT Star Tracker Serial Payload Computer Room Fiber 5 PFIS PFIS Contact Microphone PFIS Control room Area Coax (RG174) 5 PFIS Cryotiger coolant supply Igloo - PM PFIS (Vis) 1 46 Braided steel 15 PFIS Cryotiger Coolant return PFIS (Vis) Igloo - PM 1 46 Braided steel 15 PFIS Compressed dry air - instr gr see payload sheet Glycol see payload sheet Figure 10 Note: Main Supply power is 220V ac general mains and UPS. 18

19 3. Appendix A Figure 11 19

20 UPS Power From UPS Plugs in Computer Room CB175 20A CB C V Salticam Power Supply C2100 Communication Bus (Optical Fibre) Aquisition Computer C2101 Communication Bus (Optical Fibre) Note: PC's are connected on Multi-plugs C2102 PFIS CCD CB168 20A CB C V PFIS Power Supply C2103 Communication Bus (Optical Fibre) PFIS Computer Note: PC's are connected on Multi-plugs CB174 20A CB C V Payload Power Supply C2104 Communication Bus (Optical Fibre) Payload Computer Note: PC's are connected on Multi-plugs C2105 C2106 Communication Bus (Optical Fibre) Communication Bus (Optical Fibre) CB177 15A CB C147 ELECTRICAL ROOM COMPUTER ROOM CABLE WRAP (See Table) 20

21 4. Appendix B Figure 12 21

22 22