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AUSTRALIAN
NATIONAL UNIVERSITY System Design Note 4.05 Created: 11 April 2000 Last modified: 0 XXX 0000 |
NIFS WEIGHT BUDGET
Peter J. McGregor
Research School of Astronomy
and Astrophysics
Institute of Advanced
Studies
Australian National
University
Revision History
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Revision No. |
Author & Date |
Approval & Date |
Description |
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Revision 1 |
Peter J. McGregor 11 April 2000 |
Jan van Harmelen 12 April 2000 |
Original document. |
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Contents
1 Purpose
This document defines the weight budget for the Gemini Near-infrared Integral-Field Spectrograph (NIFS).
2 Applicable Documents
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Document ID |
Source |
Title |
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RSAA |
NIFS Functional and Performance Requirements Document |
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IGPO |
Instrument Support Structure to Science Instruments ICD |
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3 Introduction
The Gemini Near-infrared Integral-Field Spectrograph (NIFS) is required to have 1) a weight of 2000 kg, 2) a center of gravity on the port axis 1000 mm from the mechanical interface on the ISS, and 3) an out of balance torque less than 400 Nm with respect to the telescope elevation axis (NIFS Functional and Performance Requirements Document, SDN0003.02; ICD 1.5.3/1.9). This document defines the weight budget for the instrument and the current uncertainties in the various weight estimates.
4 Weight Budget
The weight budget is presented in Table 1.
Table 1: NIFS Weight Budget
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Item |
Mass (kg) |
Source |
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ISS Interface |
187 |
AutoCAD solid model |
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Main Frame (and partial ballast) |
500 |
Estimate |
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Vacuum Jacket |
315 |
Young et al. (1998)[1]
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OIWFS |
147 |
Young et al. (1998)1; includes cold work surface |
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Spectrograph |
40 |
Estimate |
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Detector Controllers (2 of) |
10 |
Estimate |
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Thermal Enclosures (2 of) |
330 |
From Gemini ICD 1.5.3/1.9 |
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Detector Controller Power Supplies (2 of) |
15 |
Estimate |
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IOC (2 of) |
40 |
Estimate |
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ICS Stepper Motor Drive Frame |
20 |
Estimate |
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ICS Sensor Interface Frame |
10 |
Estimate |
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ICS Temperature Controllers (3 of) |
15 |
Estimate |
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ICS Temperature Control Hardware |
20 |
Estimate |
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Cabling and Hoses |
50 |
Estimate |
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Miscellaneous |
40 |
Estimate |
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Subtotal |
1739 |
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Ballast |
261 |
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Total |
2000 |
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