CFHT, Instruments, Spectroscopy, Fabry-Perot.

Canada-France-Hawaii Telescope

User's Manual for Scanning Fabry-Perot Spectrography

R. Arsenault, P. Martin
Version 3.02
February, 2005


Table of Contents

News Updated!

Foreword

1 Instrument Purpose and Performance

1.1 Why use it and What for?
1.2 The Instruments MOS, OSIS, and the AOB
1.3 The Fabry-Perot Etalons
1.4 The Detectors
1.5 Limiting Magnitude and Performance
1.6 Emission Lines versus Absorption Lines

2 Your Observing Session: Pegasus

2.1 Taking an Exposure and Spectral Scanning
2.2 Files Management
2.3 Quick Look and On the Spot Examination of Data
2.4 Various Tools on Pegasus

3 Observing Procedures

3.1 Getting Started on the Sky
3.2 How to Scan
3.3 Calibrations

4 Future Prospects of Fabry-Perot

4.1 SIS Upgrade to OSIS: OSIS/FP
4.2 OASIS and PYTHEAS
4.3 MORGANE

5 Setup and Checklist

5.1 The Fabry-Perot in a Nut-shell
5.2 At the Instrument
5.3 On the Pegasus Session

Hyperlinks Index

News

(09/10/2003)

Deal All,

It's been a while since anything new was written here... The Fabry-Perot mode with MOS is still offered, even if it has not been used as such for several years now. During the last run, we used the EEV1 chip as a detector and it worked well. However, it is a thinned chip; fringing can be an issue if working in the red. We used it during the last MOS-FP run and fringes with an amplitude of the order of 1-2% were seen around Halpha. Also, the EEV1 pixels are only 13.5 microns compared to 21 microns for STIS2 (previous detector not available anymore). The MIT 1 chip has now been tested on MOS and is the CCD to be requested for 2005. It is a similar chip as EEV1 but does not have as bad of a fringing problem in the red and the pixel size is 15 microns.

For further information, please contact the MOS-FP instrument scientist.

Foreword

Although we usually do not have as much time as we would like to dedicate to documentation and manuals, a few days has been spent thinking about how to make this manual easy to use and most helpful to the observers. We have tried to implement a quick and easy help, fast keyword search feature. For instance the following hyperlinks index, with topics chosen to provide quick answers to common problems or typical procedures. The goal of this manual is clearly to help astronomers get the best observations out of MOS/FP, OSIS/FP or AOB/FP, by an adequate understanding of how these instruments work. If you feel it does not reach this goal, please send your comments, suggestions or criticisms (compliments are also appreciated). More information on Fabry-Perot interferometers or the specifics of the instruments hosting the Fabry-Perot etalons has been added as hyperlinks for the ones wishing to read more about the details. The use of Hyperlinks often complicates the printout of such manuals, although a special effort has been made to keep the printing as straightforward as possible. However, it is definitively assumed that this manual will be accessed from a computer rather than being read on a hardcopy.

Some observing procedures and general information can be found in the small cookbook prepared to help the observers during their mission.

Hyperlinks Index

A
B
C
Calibration Lamps
CCD Control
CFHT CCD's@
CFHT Fabry-Perot Characteristics
Checklist
CS100 Settings
CS100 Loop Control Problems
D
Data Cube
Demo Pegasus Sessions
Detectors
E
Exposure type
F
Fabry-Perot Finesse Calculation
Fabry-Perot Scanning Constant Calculation
Fabry-Perot Parallelism Adjustment
Fabry-Perot Introduction
Fabry-Perot Module
Filter slides (MOS and OSIS...)
Filter List (CFHT)@
Filter Control
Field of View
Focussing
Focus change due to different filters
G
H
I
Image Quality
Image Scale
J
K
L
Logsheet
M
MOS/FP Schematic
MORGANE
N
O
Observation Preparation Form
One Picture is worth a Thousand Words...
OSIS
OASIS
P
Path Difference
PYTHEAS
Q
Queensgate Etalon Schematic
R
S
Sampling
SAOimage
Scanning: Pegasus form
Scanning Philosophy
T
Throughput
U
Useful Formulae 1
Useful Formulae 2
Username or Acquisition Account
V
W
X
Y
Z

Please send comments to: martin@cfht.hawaii.edu