Mr. Ibon Larracoechea Profile

Ibon Larracoechea

at IDOM Ingenieria y Consultoria SA

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 4 August 2014 Paper

DKIST enclosure modeling and verification during factory assembly and testing

Ibon Larrakoetxea, William McBride, Heather Marshall, Gaizka Murga

Proceedings Volume 9150, 91501S (2014) https://doi.org/10.1117/12.2059083

KEYWORDS: Camera shutters, Mathematical modeling, Systems modeling, Control systems, Chemical elements, Telescopes, Thermal modeling, Observatories, Calibration, Solar telescopes

Read Abstract +

The Daniel K. Inouye Solar Telescope (DKIST, formerly the Advanced Technology Solar Telescope, ATST) is unique as, apart from protecting the telescope and its instrumentation from the weather, it holds the entrance aperture stop and is required to position it with millimeter-level accuracy. The compliance of the Enclosure design with the requirements, as of Final Design Review in January 2012, was supported by mathematical models and other analyses which included structural and mechanical analyses (FEA), control models, ventilation analysis (CFD), thermal models, reliability analysis, etc. During the Enclosure Factory Assembly and Testing the compliance with the requirements has been verified using the real hardware and the models created during the design phase have been revisited. The tests performed during shutter mechanism subsystem (crawler test stand) functional and endurance testing (completed summer 2013) and two comprehensive system-level factory acceptance testing campaigns (FAT#1 in December 2013 and FAT#2 in March 2014) included functional and performance tests on all mechanisms, off-normal mode tests, mechanism wobble tests, creation of the Enclosure pointing map, control system tests, and vibration tests. The comparison of the assumptions used during the design phase with the properties measured during the test campaign provides an interesting reference for future projects.

Proceedings Article | 10 November 2011 Paper

ATST enclosure mechanical and thermal models

Gaizka Murga, Heather Marshall, LeEllen Phelps, Ana Hervás, Ibon Larracoechea

Proceedings Volume 8336, 83360K (2011) https://doi.org/10.1117/12.915575

KEYWORDS: Camera shutters, Solar radiation models, Telescopes, Thermal modeling, Control systems, Systems modeling, Solar telescopes, Observatories, Sun, Skin

Read Abstract +

The Advanced Technology Solar Telescope (ATST) is a 4-m class solar telescope to be built in Haleakala Observatory in Maui (HI). It will be the largest solar telescope in the world, with unprecedented abilities to view details of the Sun. Using adaptive optics technology, ATST will be able to provide the sharpest views ever taken of the solar surface. It is expected that the 4-meter class telescope will have a significant impact on the study of stellar magnetic fields, plasma physics and astronomy, allowing scientists to learn even more about the Sun and solar-terrestrial interactions. Apart from the traditional weather protection functions, ATST Enclosure supports the telescope Aperture Stop which must be accurately positioned to fully illuminate the primary mirror, while preventing insolation of any other system components. This positioning is performed by the enclosure shutter (altitude) and azimuth mechanisms. In order to evaluate the positioning capabilities of both mechanisms and verify the structure-mechanism-control interaction of the involved systems a dynamic coupled model has been created. On the other hand, the skin of the enclosure is thermally controlled to avoid the "enclosure seeing" by rejecting solar radiation and keeping its surface temperature as close as possible below the ambient temperature. The thermal control is achieved by a set of water cooled plate coils. The cooling fluid flow is controlled to achieve the desired reference temperature. The performance of the system is being analyzed by means of mathematical model with couples the thermal radiation analysis and the control system performances.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years