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MRO Delay Line

DL Trolley Acceptance Tests
INT-406-VEN-0202

The Cambridge Delay Line Team

rev 0.2 9 September 2010

Cavendish Laboratory JJ Thomson Avenue Cambridge CB3 0HE UK


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Change Record
Revision Date Author(s) Changes 0.1 2010-09-08 MF Initial outline derived from List of Tests INT-406-VEN-0108 0.2 2010-09-09 MF Added pre-acceptance tests at ISF (no metrology system)

Objective
This document defines the list of acceptance tests to be undertaken for the testing of the production delay line trolley.

Scope
The list is a comprehensive suite of tests defined for both factory acceptance testing (FAT) and site acceptance testing (SAT) of the delay line production trolley. Included is a section on pre-acceptance testing (formerly campus acceptance tests) of a production trolley at the Infrastructure Facility (IFS) on NMT's campus. There is an open test track at the ISF but no metrology system and therefore tests are limited to trolley functionality and slew tests.

Reference Documents
RD1 Results of the Risk Reduction Experiments Rev. 1.0, 6th December 2005 RD2 Top-level requirements INT-406-TSP-0002 RD3 Derived Requirements INT-406-VEN-0107

Applicable Documents
.


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Acronyms and Abbreviations
BCA BCF BRS DL DLA FAT ICD ISF ISS Beam Combining Area Beam Combining Facility Beam Relay System Delay Line Delay Line Area Factory Acceptance Test(s) Interface Control Document Infrastructure Facility Interferometer Supervisory System MROI Magdalena Ridge Observatory Interferometer MRAO Mullard Radio Astronomy Observatory NMT New Mexico Tech OPD SAT TBC TBD Optical Path Delay Site Acceptance Test(s) To be confirmed To be determined


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Table of Contents
Introduction .................................................................................................................................. 5 1.1 Grouping of Tests................................................................................................................. 5 1.2 Test conditions ..................................................................................................................... 5 1.2.1 Testing at atmosphere .................................................................................................. 5 1.2.2 Testing under vacuum conditions ................................................................................ 5 2 Tests at atmosphere ...................................................................................................................... 6 2.1 Trolley slew tests ................................................................................................................. 6 2.2 Trolley tracking tests............................................................................................................ 6 2.3 Trolley trajectory tests ......................................................................................................... 7 2.4 Trolley roll and shear loop tests ........................................................................................... 7 2.5 Datum tests........................................................................................................................... 8 2.6 Focus mechanism tests ......................................................................................................... 8 2.7 Trolley limits tests................................................................................................................ 8 2.8 Vacuum integrity test ........................................................................................................... 8 3 Tests under vacuum ..................................................................................................................... 9 3.1 Trolley slew tests ................................................................................................................. 9 3.2 Trolley tracking tests............................................................................................................ 9 Trolley trajectory tests ......................................................................................................... 9 3.3 3.4 Trolley roll and shear loop tests ........................................................................................... 9 Datum tests......................................................................................................................... 10 3.5 4 ISF Tests .................................................................................................................................... 10 Slew Tests .......................................................................................................................... 10 4.1 4.2 Equivalent tracking tests .................................................................................................... 10 Trolley roll tests ................................................................................................................. 11 4.3 4.4 Focus mechanism tests ....................................................................................................... 11 Trolley limits tests.............................................................................................................. 11 4.5 1


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1

Introduction

The test list presented here is designed to show that the top level and derived requirements are met and that the performance of the system is maintained over representative observing periods. A short description of each test is given together with any specific conditions that should apply for the duration of the test. The derived requirement with which the test is associated is given in the last column of the tables. A top level requirement is identified with the letters TL followed by the section number and paragraph number. Tests are grouped into categories for convenience of referencing but this is not meant to imply any particular significance or order in testing. All tests may be conducted at atmospheric pressure but a substantial subset of these tests must be repeated under vacuum conditions. The differences between testing at atmosphere and testing under vacuum are explained below

1.1

Grouping of Tests

Tests are grouped under general categories that address some particular aspect of the requirements. These groups are: Slew tests: these test the repositioning time of the trolley, the maximum velocity and acceleration, the power consumption and trolley temperatures, and show that the metrology system maintains lock when the shear system and steering loops are closed. Tracking tests: these comprise constant velocity tests over a range of tracking velocities from 0.1mm/s to 15mm/s, sets of 10 minute long tracking tests to represent normal observation times and tracking over joins to assess the effect of the join. Trajectory tests: these test the re-positioning of a trolley from tracking at one position to tracking at another position, tracking at constant accelerations and tracking reversal and tracking offsets of 0.5µm to 10µm. Roll and shear tests: these check the operation of the shear loop, the secondary tip/tilt servo and the effect of the steering in open and closed loop. They also provide information on the deviations of the delay line pipe. Datum tests: these test the repeatability of the datum switch and the overall stability of the datum over a period of time. Focus tests: these test the resolution and stability of the cat's eye focussing system. Limit tests: these test the functionality of the limits and the characteristics of the trolley and cat's eye servos when a limit is encountered. Vacuum tests: this is a specific test of the hold time of the test rig when evacuated to less than 1mbar.

1.2

Test conditions

1.2.1 Testing at atmosphere
Testing at atmosphere is much more convenient than testing under vacuum conditions. Most tests that are met at atmosphere can be expected to meet the requirements under vacuum. The main difference in testing at atmosphere is that air in the pipe will be pushed about by the trolley and so servos will have to work harder and there is more coupling from the trolley to the cat's eye. On the other hand air damping is also increased. The delay line pipe must be left partially open at both ends to allow air to flow in or out and reduce the effect on the trolley. The rear DL pipe plate holding the RF antennas, ground plane and RF absorbent material must remain in place but spaced off from the end section of pipe. No science windows or blanking plates should be fitted in the delay line pipe near end plate for these tests.

1.2.2 Testing under vacuum conditions
When testing under vacuum the end plates are installed properly on the delay line pipe and the science and


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metrology windows are fitted (the science beam ports may be blanked off). The test rig is evacuated to approximately 0.5 mbar.

2
2.1
Test No. 1

Tests at atmosphere
Trolley slew tests
Primary objective Check velocity ramping under VME Test control by moving fixed distances (plus repositioning and minus): 4mm, 10mm, 20mm, time 50mm 100mm 200mm 500mm 2m. Delay precision Carry out a full length slew (the Check maximum velocity is +0.7m/s) metrology lock Carry out a full length slew (the Check maximum velocity is -0.7m/s) metrology lock Carry out a sequence of full length Check slews equivalent to ~400m of delay line temperatures travel Check power Test Description Subordinate objectives Check track/slew switching Check time Check power Check time Check power Check steering performance Derived/ Requirement 2.2.1 2.2.2 (TL 5.2.4) 2.2.1 2.2.2 2.2.1 2.2.2 2.5.1

2 3 4

2.2
Test No. 1a

Trolley tracking tests
Test Description Test tracking at rates of (plus and minus) 0.1mm/s, 0.2mm/s, 0.4mm/s, 0.8mm/s and then 1 to 15mm/s in increments of 1mm/s. Steering and tip-tilt loops closed. Continuous tracking for 10 minutes at the following velocities: 0.2mm/s, 1mm/s, +5mm/s and -10mm/s. (may need to log in sections if log files are too long: 30s log is ~11MB) Continuous tracking across joins ­ position trolley so as to cross join at 0.2mm/s and again at 1mm/s and 5mm/s for each accessible pipe joint. Primary objective Test of OPD performance Subordinate objectives Derived Requirement (TL 5.2.6)

2

Test of OPD performance over typical observation time Test of performance over joins in pipe

(TL 5.2.6)

3

(TL 5.2.6)


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2.3
Test No. 1

Trolley trajectory tests
Test Description Test trajectory acquisition and time by switching from tracking at one position to tracking at another position for a range of distances e.g 4mm, 20mm, 100mm, 200mm, 500mm, 2m 10m and 14m. Test tracking at constant accelerations 0.3ms-2, 0.625ms-2, 1.25 ms-2. Test reversing direction while tracking with a realistic trajectory. Test response to fringe tracking offsets of 0.5µm, 1µm and 10µm Primary objective Check reacquisition time & delay precision Test of OPD performance Test of OPD performance Test offset response Subordinate objectives Derived Requirement (TL 5.2.4)

2 3 4

(TL 5.2.6) (TL 5.2.6) (TL 5.2.11)

2.4
Test No. 1

Trolley roll and shear loop tests
Test Description Slew the trolley for the full length of the delay line at a constant velocity of 90mm/s with steering and tip/tilt loops closed. Slew the trolley along the delay line at a constant velocity of 100mm/s while logging with steering loop off but centred and check roll display on GUI. Slew the trolley the delay line at a constant velocity of 100mm/s while logging and with steering loop off but set at maximum deviation and check roll display on GUI. Operate the tip/tilt actuator between its limits in both axes and measure the resulting shear of the metrology beam using the shear sensor. Using the same results gathered in (4) obtain the slew rate of the tip/tilt device in both axes. Primary objective Check tip/tilt Subordinate Objectives Measure pipe deviation Check steering performance Check steering centre position Ensure trolley is retrievable if steering fails Derived Requirement 2.4.1

2

Check trolley balance. Check for limit of roll angle. Check tip/tilt range Check tip/tilt slew rate

-

3

-

4

2.1.2.2

5

2.1.2.3


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2.5
Test No. 1 2 3 4

Datum tests
Test Description Primary objective Acquire datum 10 times from close range To check and check the deviation from zero at the datum switch instant before the reset. repeatability Acquire datum 10 times from different To check starting positions: at, near, far. Check datum deviation as for test 1 stability Acquire datum at various times through To check testing phase. Check deviation as for test 1 intra-night stability Acquire datum the following day. Check To check deviation as for test 1 inter-night stability Subordinate Objectives Derived Requirement (TL 5.1.1) (TL 5.2.4) (TL 5.1.1) (TL 5.2.4) (TL 5.1.1) (TL 5.2.4) (TL 5.1.1) (TL 5.2.4)

2.6
Test No. 1 2

Focus mechanism tests
Test Description Request a range of focus motions chosen to demonstrate the positioning resolution and repeatability. Measure the change in tilt of the return metrology beam while heating the trolley through continuous motion. Primary objective Test focus resolution Test focus drift Subordinate Objectives Derived Requirement 2.1.3.1 2.1.3.2

2.7
Test No. 1

Trolley limits tests
Test Description Drive trolley into each limit at 200mm/s, check that trolley slows within allowed distance and then stops within expected distance after reaching final limit. Check trolley will drive out of limit. Drive trolley into each limit at 700mm/s and check that trolley stops within expected distance and cannot be driven further, but can be driven out of limit. Primary objective Test limit functionality Subordinate Objectives Check cat's eye current limit. Check cat's eye current limit. Derived Requirement 2.3.1

2

Test limit functionality

-

2.8
Test No. 1

Vacuum integrity test
Test Description Pump down to 0.2 to 0.5 mbar and check pressure over next few days Primary objective Test of seal Subordinate Objectives Test of system Derived Requirement 4.1.3


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3
3.1
Test No. 1 2 3

Tests under vacuum
Trolley slew tests
Test Description Carry (maxi Carry (maxi Carry slews delay out a full length slew mum velocity is +0.7m/s) out a full length slew mum velocity is -0.7m/s) out a sequence of full length equivalent to ~400m of line travel Primary objective Check metrology lock Check metrology lock Check temperatures Check power Subordinate objectives Check time Check power Check time Check power Check steering performance Derived Requirement 2.2.1 2.2.2 2.2.1 2.2.2 2.5.1

3.2
Test No. 1

Trolley tracking tests
Test Description Test tracking at rates of (plus and minus) 0.1mm/s, 0.5mm/s, 1mm/s, 5mm/s, 10mm/s and 15mm/s. Steering loop closed. Continuous tracking for 10 minutes at the following velocities: 0.2mm/s, 1mm/s, +5mm/s and -10mm/s. (may need to log in sections if log files are too long: 30s log is ~11MB) Primary objective Test of OPD performance Test of OPD performance over typical observation time Subordinate objectives Derived Requirement (TL 5.2.6)

2

(TL 5.2.6)

3.3
Test No. 1

Trolley trajectory tests
Test Description Test trajectory acquisition and time by switching from tracking at one position to tracking at another position for a range of distances e.g 4mm, 20mm, 100mm, 200mm, 500mm, 2m 10m and 14m. Test response to fringe tracking offsets of 0.5µm and 1µm (also 10µm if can be rate limited) Primary objective Check reacquisition time Test step response Subordinate objectives Derived Requirement (TL 5.2.4)

2

(TL 5.2.11)

3.4
Test No. 1

Trolley roll and shear loop tests
Test Description Slew the trolley for the full length of the delay line at a constant velocity of 90mm/s with steering and tip/tilt loops closed. Primary objective Check tip/tilt Subordinate Objectives Measure pipe deviation Check steering performance Derived Requirement 2.4.1


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3.5
Test No. 1 2 3 4

Datum tests
Test Description Primary objective Acquire datum 10 times from close range To check and check the deviation from zero at the datum switch instant before the reset. repeatability Acquire datum 10 times from different To check starting positions: at, near, far. Check datum deviation as for test 1 stability Acquire datum at various times through To check testing phase. Check deviation as for test 1 intra-night stability Acquire datum the following day. Check To check deviation as for test 1 inter-night stability Subordinate Objectives Derived Requirement (TL 5.1.1) (TL 5.2.4) (TL 5.1.1) (TL 5.2.4) (TL 5.1.1) (TL 5.2.4)

4

ISF Tests

These are functional tests that may be performed when a metrology system is not available. They are limited to trolley operation in `slew mode' only. Motions of the trolley are commanded by direct slew commands from the workstation GUI. The trolley computer `knows' if a metrology system is not connected and will not allow the trolley to switch into `tracking mode'.

4.1
Test No. 1

Slew Tests
Test Description Check velocity ramping under VME control by moving fixed distances (plus and minus): 4mm, 10mm, 20mm, 50mm 100mm 200mm 500mm 2m. Carry out a full length slew (the maximum velocity is +0.7m/s) Carry out a full length slew (the maximum velocity is -0.7m/s) Primary objective Test repositioning time Delay precision Check metrology lock Check metrology lock Subordinate objectives Check track/slew switching Check Check Check Check time power time power Derived/ Requirement 2.2.1 2.2.2 (TL 5.2.4) 2.2.1 2.2.2 2.2.1 2.2.2

2 3

4.2
Test No. 1

Equivalent tracking tests
Test Description Test slew at rates of (plus and minus) 0.2mm/s, 0.5mm/s and then 1 to 5mm/s in increments of 1mm/s. Steering loop closed. Primary objective Test of trolley low speed performance Subordinate objectives Derived Requirement (TL 5.2.6)


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4.3
Test No. 1 2

Trolley roll tests
Test Description Slew the trolley for the full length of the test track at a constant velocity of 90mm/s with steering loop closed. Slew the trolley along the delay line at a constant velocity of 100mm/s while logging with steering loop off but centred and check roll display on GUI. Slew the trolley the delay line at a constant velocity of 100mm/s while logging and with steering loop off but set at maximum deviation and check roll display on GUI. Primary objective Check tip/tilt Check trolley balance. Check for limit of roll angle. Subordinate Objectives Check steering performance Check steering centre position Ensure trolley is retrievable if steering fails Derived Requirement 2.4.1 -

3

-

4.4
Test No. 1 2

Focus mechanism tests
Test Description Request a range of focus motions chosen to demonstrate the positioning resolution and repeatability. Measure the change in tilt of the return metrology beam while heating the trolley through continuous motion. Primary objective Test focus resolution Test focus drift Subordinate Objectives Derived Requirement 2.1.3.1 2.1.3.2

4.5
Test No. 1

Trolley limits tests
Test Description Drive trolley into each limit at 200mm/s, check that trolley slows within allowed distance and then stops within expected distance after reaching final limit. Check trolley will drive out of limit. Drive trolley into each limit at 700mm/s and check that trolley stops within expected distance and cannot be driven further, but can be driven out of limit. Primary objective Test limit functionality Subordinate Objectives Check cat's eye current limit. Check cat's eye current limit. Derived Requirement 2.3.1

2

Test limit functionality

-