Voyager LECP Data Analysis Handbook

Calibrations and Channel Definitions

April 9, 1980

To: Distribution

From: S. M. Krimigis

Subject: VOYAGER Ion Passbands in LEMPA Detector

Attached please find a list of passbands and efficiencies for Detector a ion response. These were arrived at by a combination of preflight calibrations, inflight performance, additional calibrations at the GSFC accelerator, and some theoretical computations. Please note that differential intensities for protons contained in FAT tapes have been computed with slightly different passbands and need to be adjusted as appropriate.

The efficiencies for heavy ions are estimated at the 75% level of maximum efficiencies, because the efficiency curves are not flat. In addition, the efficiencies for S were estimated from those measured for O and Ar, and are not as reliable. I would estimate the overall efficiencies for O and S at the three lowest PLO channels as no better than 10% and possibly as much as 20%. However, they are a lot better than what we have assumed in the past (1.0). We owe these estimates to the hard work of John Kohl and Don Mitchell who spent countless hours at the GSFC accelerator during the past week making these runs.

Let us make sure that in all our papers from now on, these numbers are quoted consistently. I'm looking forward to your first drafts before May 1.

Attachments
SMK:ban

Distributions:
Science Paper Co-Authors
R. B. Decker
J. W. Kohl
R. W. McEntire
E. C. Roelof
C. G. Maclennan
E. Kirsch
D. G. Mitchell

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