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MROI Science Combiner Downselect

Workpackage Definition

INT-407-PMG-nnnn rev 0.2
10 July 2006

John Young jsy1001@cam.ac.uk

Cavendish Laboratory JJ Thomson Avenue Cambridge CB3 0HE, UK http://www.mrao.cam.ac.uk/

Magdalena New 801 Socorro,

Ridge Observatory Mexico Tech Leroy Place NM 87801,USA

http://www.mro.nmt.edu


Objective
To define the scope, deliverables, and milestones for the science beam combiner downselect work package. To list the participants in the activity and their roles.

Scope
This document briefly summarises the scope of the MROI science beam combiner downselect work package as re-defined in June/July 2006.

1 Introduction and Background
The "science combiner downselect work package" is a continuation of part of the beam combiner studies began by Cambridge and NMT in December 2005. The background to and scope of the previous beam combiner studies are outlined in INT407-VEN-0002. The downselect activity will henceforth be managed as a pseudo (unpaid) contract with the Cavendish Laboratory, with some work being "sub-contracted" to NMT. JSY will act as the point-of-contact for communications with the MROI project manager and IDT related to this work package. There will be regular "Work Package" meetings (generally by teleconference), along the lines of the other Work Package Meetings being set up at NMT. The format of a work package meeting will generally conform to the scheme proposed by EB in document INT-401-COR-SM-2006-06-15. The only significant changes from the scope of the previous beam combiner studies are that:


Options for the fringe tracking beam combiner will not be investigated as part of this work package. Studies of possible concepts for a commissioning instrument are no longer part of this work package.

The PNN (Pupil plane Nearest-Neighbour) scheme has been adopted as the baseline combiner concept for the Fringe Tracker, which is now managed as an independent work package.

2 Scope of Work Package
The purpose of the activity is thus to select one of the near-IR science combiner concepts P4S, P8, I4S, I6 to be carried forward. The concepts are described in Baron et al., Proc. SPIE 6268, Paper 64. Due to the level of detail needed to make an informed choice, a side-effect is that a preliminary design for the downselected combiner will also be a work package product. The work package ends once the downselect has been made. The end date for the activity is expected to be in early November 2006. Milestones for the work package are listed in Sec. 4.


2.1

Deliverables
Deliverable Date

The following deliverables will be provided to NMT as products of the work package: Final Report comparing preliminary designs for each concept, 6 November 2006 with recommended choice Preliminary design drawings and specifications for NMT's chosen concept. Includes switchyard
27 November 2006

A number of the deliverables from the previous beam combiner studies have already been produced ­ these are listed in Sec. 4.

3 Roles and responsibilities
The participants in the work package and their expected roles are given in the following table (in alphabetical order):
Person
Fabien Baron David Buscher Julien Coyne Michelle Creech-Eakman Colby Jurgenson Chethan Parameswariah John Young

Institution
Cambridge Cambridge Cambridge NMT NMT NMT Cambridge

Role(s)
Image plane combiner/spectrograph design Modulator specification, error budgets, diffraction calculations Pupil-plane combiner design, switchyard design, modulator tests Spatial filter studies Pupil plane spectrograph design, interface to alignment system Slide tests Point of Contact, Final Report, signal-to-noise and imaging speed calculations, detector requirements

4 Milestones
Milestones with associated deliverables are shown in bold type. Please note that there are no formal deliverables to NMT associated with the other milestones. Internal (to the work package) reports will be produced (and read by the NMT staff on the work package team), but these will not contain sufficient background to be suitable for review by the IDT.
Milestone
Beam size memos Generic Switchyard Requirements Devise slide tests Survey of commercial slides Generic Detector Requirements P4S combiner optimization P4S switchyard optimization P8 combiner optimization

Person(s)
DFB JC CJ CP JSY JC JC JC

Status
Delivered Delivered Complete Complete Delivered Complete Complete Complete


Milestone
P8 (internal) switchyard optimization P4/P8 manufacturer dialogue P4S/P8 spectrograph optimization I4S combiner optimization I4S switchyard optimization I6 combiner optimization Optical interface with fringe tracker Slide tests Phase 1 (1 slide, tip-tilt repeatability) Spatial filter evaluation Alignability evaluation Modulator requirements Modulator tip-tilt tests Signal-to-noise calculation Slide tests Phase 2 (2 slides, OPD repeatability) Imaging speed calculation Costing Final Report Preliminary design for downselected concept

Person(s)
JC JC CJ FB JC FB JC/CJ CP MCE JC/CJ DFB JC JSY CP JSY JSY JSY FB/JC

Status
Complete

Due 2006/07/31 Due 2006/09/01 Due 2006/07/17
Complete

Due 2006/07/17 Due 2006/08/14 Due 2006/08/14 Due 2006/09/11 Due 2006/10/23 Due 2006/07/31 Due 2006/09/25 Due 2006/10/09 Due 2006/10/16 Due 2006/10/23 Due 2006/10/23 Due 2006/11/06 Due 2006/11/27