WEAVE Spectrograph allhands Summary 1 4 break out

WEAVE Spectrograph all-hands Summary 1

4 ½ break out sessions • Low Level Control System - Spectrograph High level Control System - Spectrograph • Spectrograph integration into GHRIL • Integration of Spectro slits at Oxford (Positioner) • Spectrograph Optics, mainly coating discussions 2

Low Level Control System Spectrograph • Summary: – Introduction of low level software by INAF/IAC to NOVA – Live working Demo !!!! pistons moving in Tenerife by control in Cambridge. – Software looks good. Easy to learn/work with. – Suitable for doing all tests in Dwingeloo on the Spectro and main issue on safety is build in – We get remote acces for Dwingeloo team and for Remko (Amsterdam, Leiden, train) – Around Feb. 2017 transfer to Dwingeloo? ? 3

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Low Level Control System Spectrograph • Actions: – Ip adress from ASTRON to provide for router (Johan) – Each cover will have a coverswitch what goes to the intermediate boxes YES/NO? (Remko, Jose) – Pressure sensor on each actuator? ? (Jose) – Bi-stable valve for the airpads, what type (Remko) – Y-rod, survive individual homing of motors (Niels) – Loctite for all end of cylinders to mechanism (Niels) (because end switches on cylinder and not on mech. ) – Account information for Remko and Dwingeloo (Jose) – Safety stuff is not yet fully finished (Jose, Bernardo) 5

High level Control Software Spectrograph • Summary: – Low level software suits all testing in Dwingeloo – OCS and SPE want to test High level software on modes before shipment – Testing in last months before shipment is oké. • Actions: – Provide high level control software Q 4’ 17 Sergio 6

Spectrograph integration into GHRIL • Summary: – Several actions for the GHRIL room are scheduled like air handling work (4 th of Sep. 2017), cover up walls, closing Nasmyth port, … – Better put all actions in ICD document for reference – Cleanliness discussions on packing, handling, cleanliness – Slit units, dummy boxes (4 x) for testing assembly (full dummy run) in October 2017 – Responsibility on hoisting and handling from ground into Ghril is by ING up to closing roof. Unpacking and Assembly is NOVA (GHRIL and groundfloor) 7

Spectrograph integration into GHRIL • Actions: – Buffer volume, valves, split off to airpads, Update the interface document, mech. interface – Check if a simple crane can go inside to lift detectors and VPHG-units – List of packing/unpacking of instrument in document – Slit covers as mock-up or the real boxes. For full dummy run in October 2017 – Dust monitor for checking cleanliness GHRIL room after upgrade – Quality (dry) clean air at GHRIL for detector flushing – Specifications for the Remko Niels, Don Eddy Niels, Johan Emilie Don 8

Integration of Spectro slits at RAL (Positioner) • Summary slit assembly @ Oxford: – Slit integration inside this clean area, – Back Illumination of the slits required at Oxford • Summary on strain relief – Fibre bundle Conjugates are clamped at the spectrograph by Icotek. – Spectro clamps the conjugate tubing at cover, the PU tubing is also clamped. strain relief discussion. – Cradle clips to add, decision? 9

Integration of Spectro slits at RAL • Actions: – Size of flow cabinet at Oxford to be defined. Slit integration inside this (or other) clean area. – Slit-integration-stand to fit into the flow cabinet at Oxford – Back Illumination of the slits prefered as seperate frame for testing at Oxford, the frontsame as sspectrograph – No window in the box required anymore – Always bag (2 x) before storing in boxes, instructions – Double check the actual design on strain relief Spectro Check to length of PEEK inside the PU tube (Prefered to have minimal overlap) – yes/no extra wire for strain over length? Test in Oct ‘ 17 – Cradle clips to add? Ian NOVA Niels, Johan NOVA Remko Frederic Kevin Dee 10

Spectrograph Optics • Summary: – TNO issue on L 1 -2 asphere surface discussed and preferences defined – Coating proposal of Esperanza discussed answere can be send out – Same for mirror – VPHG coating of HR plates discussed and concluded prefered solution 11

Spectrograph Optics • Actions • L 1 -2 asphere, Email manuf. with preferred options, suggestions Johan • L 1 -2 Measurement report : NOVA check inner diameter. Ask Radius of the first surface is more convex or concave. Johan • Email Esperanza with reaction, discuss in skype coming Thu. Johan • Histogram on distribution the angle of incidence effect Ian, RAL • Ask INAOE on optimizing coating with the historgram Johan • • Coating mirror reaction to INAOE Johan • • VPH plate coating: Update quotations Schott + INAOE Johan 12

WEAVE Spectrograph Action: Put previous actions in bi-weekly meeting list (Johan) Johan Pragt, NOVA, the Netherlands 2016 -12 -21, ALH meeting 13

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