The SIM Subsystem of COMPASS

The SIM Subsystem of COMPASS

This page contains information regarding the SIM subsystem of COMPASS. This software is used to generate simulated events in the COMPTEL experiment and to generate both spatial and spectral response information.


SIM Task Descriptions


SIM Dataset Descriptions


SIM Data Production


Event Simulations (QEV, EVP)

Generating QEV data is the most CPU-intensive part of the SIM process. Here we have collected data that have been generated by the team. The following links provide access to reports generated by a perl-based script run at UNH. (The dataset status, therefore, reflects the status at UNH.) Note that QEV data generated by SIMGAM versions 15 or earlier was generated without tracking of secondary particles. All UNH QEV datasets generated with SIMGAM version 15 or earlier have therefore been assigned quality flag values of -100; these data should be considered as an inaccurate representation of the COMPTEL response. The following reports are specifically for datasets generated by SIMGAM version 16 and later. Note that quality flag assignments are not available for a large fraction of these data.


Directly Simulated PSFs

In the direct simulation approach, the user provides the input spectrum directly to one or more SIMGAM jobs. This is followed by one or more SIMFIN jobs (one corresponding to each SIMGAM job). Once the SIMFIN jobs are completed, the complete set of resulting EVP data is used as input to SIMPSF to generate a single IAQ/FAQ pair that represents the instrument response. So the PSF generation is done using the SIMGAM/SIMFIN/SIMPSF tasks within COMPASS.


Synthesized PSFs

These PSFs were generated indirectly using a library of individual PSFs. The individual PSFs were generated with the SIMGAM/SIMFIN/SIMPSF route. The synthesized PSFs were then generated using SIMSPG.


SIM Documentation


COMPASS Documents

COM-RP-UNH-SIM-056 : issue 1 : September 23, 1997
PSF Library Simulations : 10 deg zenith angle, wide incident beam

COM-RP-UNH-SIM-054 : issue 2 : January 19, 1998
PSF Library Simulations : 30 deg zenith angle, wide incident beam

COM-RP-UNH-SIM-055 : issue 1 : June 5, 1997
PSF Library Simulations : 40 deg zenith angle, wide incident beam

COM-RP-UNH-SIM-049 : issue 1 : May 13, 1996
D1 Sensitivity as a Function of Zenith Angle
Author: R. M. Kippen

COM-RP-UNH-SIM-048 : issue 1 : May 9, 1996
Effect of Secondary Particles on the Telescope Response
Author: R. M. Kippen

COM-RP-UNH-SIM-047 : issue 2 : April 25, 1996
Revised COMPTEL SIM Mass Model Description
Author: R. M. Kippen

COM-RP-UNH-SIM-046 : issue 1 : March 25, 1996
Effect of Secondary Particles on the PSF
Author: R. M. Kippen

COM-TN-UNH-SIM-044 : issue 1 : February 17, 1995
Event Requirements for Simulated PSFs
Author: M. McConnell

COM-RP-UNH-SIM-041 : issue 1 : October 26, 1994
Point-Spread_function Synthesis Using a High Statistics PSF Library
Author: R.S. Miller

COM-RP-UNH-SIM-039 : issue 1 : June 22, 1994
Description of the COMPTEL SIM Mass Model (IDT Dataset)
Author: J.G. Stacy

COM-RP-UNH-SIM-021 : issue 3 : July 14, 1994
Log of Available IDT/ISS/ISP Datasets for SIM Processing
Author: J.G. Stacy


COMPTEL Team Meeting Handouts / Viewgraphs

The team meeting presentations have contained a great deal of information regarding the development of the SIM subsystem and the generation of COMPTEL point spread functions (PSFs). Viewgraphs from some of the more recent presentations are available below.

Team Meeting, MPE (Garching), April 15-17, 1998 : Viewgraphs (pdf)

Team Meeting, SRON (Utrecht), October 14-16, 1997 : Viewgraphs (pdf)

Team Meeting, UNH (Durham), March 4-7, 1997 : Viewgraphs (pdf)

Team Meeting, SSD (Noordwijk), November 19-22, 1996 : Viewgraphs (pdf)

Team Meeting, MPE (Garching), July 23-26, 1996 : Viewgraphs

Team Meeting, SSD (Noordwijk), April 4-7, 1995 : Viewgraphs


Last Updated: May 19, 1998

Dr. Mark L. McConnell
Space Science Center
Morse Hall, Rm 312
University of New Hampshire
39 College Road
Durham, NH 03824-3525

Phone: (603) 862-2047
Fax: (603) 862-4685

E-mail: Mark.McConnell@unh.edu