Removal of the F/8 Secondary from the 4M Prime Focus Assembly

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Doc #: 2100-AD-015-0058 Revision: - Removal of the F/8 Secondary from the

1 Doc #: 2100-AD Revision: - Removal of the F/8 Secondary from the 4M Prime Focus Assembly Author(s): Will Goble, Matthew Evatt, Miranda Saucedo

2 Contents Revision History Purpose Applicable To Scope Definitions Training Safety Personnel, Equipment and Materials Required Procedure Procedure Review Records References AD Docx Page 2 of 15

3 Revision History Rev Date Approved Sections Affected Reason for Change Remarks and/or Change Details Name -- 08/23/17 Initial release t. lavoie Approved by: Matt Evatt Name, ME Title SigEM Name, EL Maint SigSci Name, SciOps Tammie Lavoie 19 September 2017 Tammie Lavoie, Safety Manager Date 2100-AD Docx Page 3 of 15

4 1.0 Purpose The purpose of this document is to safely guide all applicable personnel through the removal of the F/8 secondary mirror from the prime focus assembly of the 4 Meter Mayall Telescope. 2.0 Applicable To This procedure is applicable to the Facilities, EM, and Engineering departments, or any additional personnel who will assist in completing these tasks for the Mayall 4 Meter Telescope. 3.0 Scope This document is a step by step procedure that outlines how to complete the removal of the F/8 secondary mirror from the prime focus assembly. 4.0 Definitions The acronyms referenced in this procedure are listed below. PF Prime Focus PFA Prime Focus Assembly PFC Prime Focus Cage 5.0 Training The trainings required for this procedure are listed below. 5.1 Lockout/Tagout 5.2 Overhead Crane Operations 5.3 Rigging 2100-AD Docx Page 4 of 15

5 6.0 Safety The safety documents required for this procedure are listed below. 6.1 Daily Briefing Form 6.2 JHA Form 6.3 Lockout/Tagout Standard Operating Policy (1000-AD ) 6.4 Lockout/Tagout Standard Operating Procedure (2100-AD ) 6.5 Cranes SOP (1000-AD ) 7.0 Personnel, Equipment and Materials Required Process # of Personnel Notes Removal of the F/8 Secondary 6 (1)-Electrical Maintenance (2)-Mechanical Maintenance (1)-Overhead Crane Operator (1)-Previous Participant (1)-Qualified Rigger Equipment/Part/Tool List Location Notes 3 Ton Dome Jib Crane 4 Meter N/A 5 Ton Dome Crane 4 Meter N/A F/8 Depth Micrometer Tool 4 Meter N/A F/8 Dummy Mirror and Cell 4 Meter N/A F/8 Mirror and Cell Removal Fixture 4 Meter N/A F/8 Mirror Band 4 Meter N/A F/8 Mirror Box 3 rd Floor, 4 Meter N/A F/8 Mirror Cover Rigging 4 Meter Strap and Clamp F/8 Mirror Removal Table 4 Meter N/A K&E Alignment Scope 4 Meter N/A K&E Scope Mount 4 Meter Blue, Adjustable K&E Scope to 4M Guider/Rotator Mounting Adapter 4 Meter White Wire Rope Sling 4 Meter Used for Main Floor Hatch SE Annex Stay Bar 4 Meter Console Floor to Top Ring 2100-AD Docx Page 5 of 15

8.0 Procedure The following processes must be completed before the removal of the F/8 secondary from the 4M prime focus assembly can begin. 8.1 Ensure the telescope is at Zenith (JHA-1). 8.2 Remove the Cassegrain Instrument (JHA-1).

6 8.0 Procedure The following processes must be completed before the removal of the F/8 secondary from the 4M prime focus assembly can begin. 8.1 Ensure the telescope is at Zenith (JHA-1). 8.2 Remove the Cassegrain Instrument (JHA-1). Note: This step is performed by the Instrumentation Group. The removal procedures for this step will depend on if KOSMOS or NEWFIRM is on the instrument. Refer to the KOSMOS Removal Procedure (2100-AD ) and its corresponding JHA (2100-AD JHA), or refer to the NEWFIRM Removal Procedure (2100-AD ) and its corresponding JHA (2100-AD JHA). 8.3 If NEWFIRM was on the telescope, install the guider (JHA-1). 8.4 Install the K&E alignment telescope adapter on the Cass guider using the blue K&E mount and the white adapter plate (Figure 1) (JHA-1). Figure 1: K&E Alignment Scope Mounted 8.5 Balance the telescope (JHA-1). Note: Refer to the 4 Meter Balancing Telescope Procedure (2100-AD ). 8.6 Stage the F/8 dummy (Figure 2), F/8 cell and mirror removal fixture (Figure 3), F/8 mirror removal table (Figure 4), and the F/8 mirror box (Figure 5) on the Ground Floor (JHA-1) AD Docx Page 6 of 15

7 Figure 2: F/8 Dummy Mirror and Dummy Cell Assembly Figure 3: F/8 Cell and Mirror Removal Fixture (Come-A-Long for Tilting) Figure 4: F/8 Mirror Removal Table 2100-AD Docx Page 7 of 15

8 Figure 5: F/8 Mirror Box 8.7 Ensure the telescope is at prime focus, with the PF corrector facing the primary mirror (JHA-1). If it is not, perform a major flip so the F/8 is facing away from the primary mirror. Note: If Mosaic is installed, follow the Secondary Major Flip F/8 to Prime Focus Procedure (2100-AD ) and the corresponding JHA (2100-AD JHA). If Mosaic is not installed, follow the Secondary Major Flip F/8 to Prime Focus (No Instrument) Procedure (2100-AD ) and the corresponding JHA (2100-AD JHA). 8.8 Lockout the telescope (JHA-1). Note: Refer to the Lockout Tagout Standard Operating Policy (1000-AD ) and the Lockout Tagout Standard Operating Procedure (2100- AD ). 8.9 Ensure the SE annex stay bar is installed from the flip (JHA-1). Note: If it is not, install it Open the hatch (JHA-1). Note: Refer to the 4 Meter Main Floor Hatch Removal Procedure (2100-AD ) and the corresponding JHA (2100-AD JHA). After completing the above, the remaining processes are as follows Rig the F/8 mirror cover (Figure 6) (JHA-2) AD Docx Page 8 of 15

DESI project (Figure 7) (JHA-3). Figure 7: 4M F/8 Mirror Cover on Telescope 8.

9 Figure 6: F/8 Mirror Cover Rigged for Removal 8.12 Remove the F/8 mirror cover and fly it down to the Ground Floor so that it can be taken away for long-term storage during the DESI project (Figure 7) (JHA-3). Figure 7: 4M F/8 Mirror Cover on Telescope 8.13 Lift the F/8 cell and mirror removal fixture to the Console Floor (Figure 3) (JHA-4). Place the spreader bar on a cart Use the depth micrometer tool to measure the tilt of the mirror cell relative to the prime focus cage (Figure 8) AD Docx Page 9 of 15

Figure 8: F/8 Depth Micrometer Tool 8.15 Verify the position of the match marks for rotation. Remove the previous marks if they are not suitable. 8.16 Remove the panel cover from the inside of the PF cage to access the translation screws (JHA-5).

17 Disconnect the electrical wiring and all other services going between the F/8 cell and mirror, and the PFA (JHA-6). 8.

10 Figure 8: F/8 Depth Micrometer Tool 8.15 Verify the position of the match marks for rotation. Remove the previous marks if they are not suitable Remove the panel cover from the inside of the PF cage to access the translation screws (JHA-5). Back off two of the translation screws; record which screws and how much each was turned Disconnect the electrical wiring and all other services going between the F/8 cell and mirror, and the PFA (JHA-6) Rig the mirror removal fixture to the 3 ton jib crane (Figure 9) (JHA-7). The chain hoist is used to adjust the angle of the fixture. Figure 9: F/8 Mirror Removal Fixture Rigged 2100-AD Docx Page 10 of 15

Mirror Cell 8.20 Unbolt the F/8 from the prime focus cage (JHA-9). 8.21 Lift the F/8 and move it to the Console Floor (Figure 12) (JHA-10).

11 8.19 Connect the removal fixture to the F/8 mirror cell (Figures 10 and 11) (JHA-8). Figure 10: Install the Removal Fixture on F/8 Mirror Cell Figure 11: Install the Removal Fixture on F/8 Mirror Cell 8.20 Unbolt the F/8 from the prime focus cage (JHA-9) Lift the F/8 and move it to the Console Floor (Figure 12) (JHA-10). Note: WHY TO CONSOLE FLOOR? WHY NOT ALL THE WAY DOWN? 2100-AD Docx Page 11 of 15

fixture down and the cell up (Figure 13) (JHA-11).

12 Figure 12: Moving the F/8 Mirror and Cell on Fixture to C-Floor 8.22 Fly the F/8 cell down to the Ground Floor and set it with the fixture down and the cell up (Figure 13) (JHA-11). Figure 13: F/8 Cell, Mirror, and Fixture on Ground Floor 2100-AD Docx Page 12 of 15

8.23 Prepare the mirror for removal from the cell. 8.24 Lift the fixture and the cell/mirror assembly, and adjust the rigging so that the mirror is facing up (Figure 14) (JHA-12).

13 8.23 Prepare the mirror for removal from the cell Lift the fixture and the cell/mirror assembly, and adjust the rigging so that the mirror is facing up (Figure 14) (JHA-12). Figure 14: F/8 Mirror and Cell Rotated so Mirror is Facing Up 8.25 Lift and install the F/8 dummy on the prime focus cage (JHA-13). Note: DO WE REALLY NEED TO INSTALL THE F8 DUMMY? 8.26 Close the hatches Remove the SE annex stay bar (JHA-14). Note: Refer to the 4M SE Annex Stay Bar Installation and Removal Procedure (2100-AD ) and the corresponding JHA (2100-AD JHA) Unlock the telescope. Note: Refer to the Lockout Tagout Standard Operating Policy (1000-AD ) and the Lockout Tagout Standard Operating Procedure (2100-AD ) Check the telescope balance Remove the mirror from the cell (JHA-15) Raise the mirror removal table to the upper limit Remove the three mirror removal plugs. Note: Refer to A Rest the mirror and cell on the removal table AD Docx Page 13 of 15

14 Ensure the mirror access ports are centered over the jacks Remove the mirror retainer. Note: Refer to D Cut the seal retaining cable and discard Remove the vacuum seal and save for a template. Note: Refer to C Lower the removal table and push the mirror out of the vacuum cell Use the 50 mirror band to move the mirror to a wash table Hand-wash the mirror Take Minolta measurements Open the F/8 Mirror Box and prepare it to receive the F/8 mirror Use the 50 mirror band to move the F/8 mirror to the F/8 mirror box, and package the mirror for long-term storage (JHA-16) Move the F/8 mirror box, with the mirror inside, to the Third Floor of the Mayall telescope for storage (JHA-17). There are not any processes that must be completed after the removal of the F/8 secondary from the 4M prime focus assembly. 9.0 Procedure Review This procedure must be reviewed by employees under the following terms: 9.1 Initially 9.2 When there is a change in the job process(es) 9.3 When there is a change in a worker s status, or job title 9.4 When governing authorities (such as OSHA) make changes 9.5 Every three years, at a minimum 2100-AD Docx Page 14 of 15

15 10.0 Records The records that must be kept on file by the supervisor are listed below. Training records must be available and maintained for a minimum of five years Daily Briefing Form Signature Page(s) 10.2 JHA Signature Page(s) 10.3 Personnel Training Records: Lockout/Tagout Overhead Crane Operations Rigging 11.0 References DOCUMENT NUMBER 1000-AD AD AD AD AD JHA 2100-AD AD AD AD JHA 2100-AD AD JHA 2100-AD AD JHA 2100-AD JHA 2100-AD AD AD DOCUMENT TITLE Lockout/Tagout Standard Operating Policy Cranes SOP 4 Meter Telescope Balancing Procedure Secondary Major Flip F/8 to Prime Focus (No Instrument) Secondary Major Flip F/8 to Prime Focus (No Instrument) JHA NEWFIRM Removal Procedure NEWFIRM Removal Procedure JHA 4 Meter Rotator/Guider Installation Procedure 4 Meter Rotator/Guider Installation JHA KOSMOS Removal Procedure KOSMOS Removal Procedure JHA 4 Meter Main Floor Hatch Removal Procedure 4 Meter Main Floor Hatch Removal JHA Removal of the F/8 Secondary from the 4M Prime Focus Assembly Lockout/Tagout Standard Operating Procedure 4M SE Annex Stay Bar Installation and Removal Procedure 4M SE Annex Stay Bar Installation and Removal JHA 2100-AD Docx Page 15 of 15

Doc #: 2100-AD Revision: - Installation of the DESI Zenith Work Platforms. Author(s): Derek Guenther, Miranda Saucedo, Tammie Lavoie

Doc #: 2100-AD Revision: - Installation of the DESI Zenith Work Platforms. Author(s): Derek Guenther, Miranda Saucedo, Tammie Lavoie Doc #: 2100-AD-015-0074 Revision: - Installation of the DESI Zenith Work Platforms Author(s): Derek Guenther, Miranda Saucedo, Tammie Lavoie Contents Revision History... 3 1.0 Purpose... 4 2.0 Applicable