From ssm@latte.msfc.nasa.gov Sat Mar 22 04:27:33 1997 Received: from space.mit.edu by wiwaxia AA03884; Sat, 22 Mar 97 04:27:32 EST Received: from head-cfa (head-cfa.harvard.edu) by space.mit.edu AA00983; Sat, 22 Mar 97 04:27:30 EST Received: from latte.msfc.nasa.gov by head-cfa (SMI-8.6/SMI-SVR4) id EAA05200; Sat, 22 Mar 1997 04:26:04 -0500 Received: from latte.msfc.nasa.gov (ssm@localhost [127.0.0.1]) by latte.msfc.nasa.gov (8.7.5/8.7.3) with ESMTP id EAA00148 for ; Sat, 22 Mar 1997 04:28:23 -0500 Message-Id: <199703220928.EAA00148@latte.msfc.nasa.gov> To: head@head-cfa.harvard.edu Subject: HRC Status #3 Date: Sat, 22 Mar 1997 04:28:23 -0500 From: "Stephen S. Murray" Status: R HRC operations were generally smooth. The Count Rate Linearity tests were completed and a quick look analysis indicates no count rate problems up to 6.8 ct/sec in the focused beam. We were hoping to achieve 5 ct/sec so this is good news. We could not get high enough flux at the 2.56 keV DCM setting we used for this experiment (we had been concerned about getting to lower fluxes) so we will need to go back later if time permits to see the roll over at higher rates. We completed the first series of HRC-I tests with DCM and began gratng tests around midnight local time. The HETG and METG images at 7keV were the first obtained on HRC-I and are quite spectacular! We did find that the separation of the inner and outer shells at zeroth order was not as clean as we wanted, so we are adjusting the x-axis offset from -18mm to +25mm to improve that separation which is needed to resolve the METG from HETG zeroth order images. We were able to see at least 6 -th order 7keV in HETG in the first test! Very nice to see images with more structure than a point for the HRC Team. Some time tomorrow we will finish the HRC-I tests with DCM with a spatial linearity scan and then turn on HRC-S. It is getting very late here 3:30am for someone supposed to be off shift at 11pm. This was necessary to support Gratings and well worth it to be able to see the first images. Goodnight all.... Steve Dr. Stephen S. Murray - Sr. Astrophysicist Associate Director - High Energy Astrophysics Division _______________________________________*_______________________________________ Smithsonian Astrophysical Observatory__| phone: (617) 495-7205 High Energy Astrophysics Division __| fax: (617) 495-7356 60 Garden Street, MS-2 __| email: ssm@head-cfa.harvard.edu Cambridge, MA 02138 __| http://hea-www.harvard.edu/~ssm/HomePage.html ___________________________|___________________________________________________