From dd@spectra.mit.edu  Thu Apr 20 16:06:55 2000
Return-Path: <dd@spectra.mit.edu>
Received: from space.mit.edu (SPACE.MIT.EDU [18.75.0.10])
	by wiwaxia.mit.edu (8.9.3/csr-2.4) with ESMTP id QAA19302;
	Thu, 20 Apr 2000 16:06:54 -0400 (EDT)
Received: from spectra.mit.edu (SPECTRA.MIT.EDU [18.75.0.91])
	by space.mit.edu (8.9.3/csr-2.4) with ESMTP id QAA19410;
	Thu, 20 Apr 2000 16:06:45 -0400 (EDT)
Received: (from dd@localhost)
	by spectra.mit.edu (8.9.3/csr-2.4) id QAA01310;
	Thu, 20 Apr 2000 16:06:44 -0400 (EDT)
Date: Thu, 20 Apr 2000 16:06:44 -0400 (EDT)
From: Dan Dewey <dd>
Message-Id: <200004202006.QAA01310@spectra.mit.edu>
To: ahicks@mit.edu, baluta, buehler, davis, dd, denicola, dph, dsd, fangt, gea,
        hermanm, houck, jhk@cis.rit.edu, jlee, kaf, matumoto, mikstage, nss,
        pgf, pmo, staylor, wise
Subject: new HETG efficiencies
Status: R
Content-Length: 1526


Local folks, 

 I have created a new set of HETG efficiencies which reflect the
current status of our ground calibration predictions, these
are version N0004 and are in:

/nfs/wiwaxia/d4/ASC/data/caldb/local/axaf/cal/hetg/cip

Do a "  ls -lst hetg*gre*N0004.rdb   " to find them.

As with the N0003 vesions, seven effic files are available
(shells 1, 3, 4, 6, HEG, MEG, HETG) in four levels of pruning
(no pruning, 0.1%, 0.5%, 2.0% accuracy) and companion
(but boring) error files are also available (grerr instead of greff).

  The plots in the files:
/nfs/wiwaxia/d4/ASC/data/caldb/local/axaf/cal/hetg/docs

hetg_op1_N0004N0003.ps
hetg_op2_N0004N0003.ps
hetg_oz_N0004N0003.ps

show the N0004 values compared with the N0003 values for
order = 1, 2, 0  (respectively for the files above)
for the seven effic combinations.

 The MEG first order in the range above 0.4 keV has
changed by less than or equal +/- 3% from N0003.

 The HEG first order in the range above 0.8 keV has
changed by less than or equal +/- 4% from N0003.

 The combined effective zero-order in the range
above 140 eV has changed by less than or equal
to +2% -6% .

 The various edges are now on a finer scale and 
are based on Kathy Flanagan's optical constants
file:
/nfs/wiwaxia/d4/ASC/data/caldb/local/axaf/cal/hetg/fcp
optical-constants.990510.tbl

 Barring any boo-boos this concludes the baseline
ground-determined efficiencies.  Expect an N0005
version in weeks/months ahead as Herman uses flight
data to adjust these values and errors!

  -Dan D