# Phase 2 # Version 1 # FIRST SUITES: checks of HETG operation, primarily verification # This file consists of a sampling of tests. # First clear all values to the null string CLEAR # Now set some initial values that are rarely changed INCLUDE default2_acis2c.include DEFAULT # Now set some defaults and substitutions for later use INCLUDE substitution2.include # Set a few parameters that won't change from test to test name MIT/ASC HLM sequence 2A priority 10 # Suite 1 # ___________________________________________________________________________ # Focus check only at 0th order using each grating. # Most photons are from Al-K, so we can integrate and allow pileup # to dominate images. # At 18 rows per frame, we get about 0.1 s per window. # At 400 e- per Al-K photon, 500 count/s gives 20,000 e-/frame, # which is as high as we desire to go in pileup mode. # Don't bother focussing LETG on ACIS becuase PSF tests are done with # the HRC instead. # ___________________________________________________________________________ type Focus Check source EIPS target Mg-Ka # small spot requested to improve size of PSF. spot_size SMALL min_fp_counts 10000 # Grating parameters grating LETG shutter ALL,SCAN order 0 # Detector parameters detector both acis_frametime 0.1 acis_proc_mode INTEG max_fp_rate 500 GO # For the HETG, we can focus the two grating sets separately or combine # the results from all shells to get an average for the assembly. SAMESUITE grating HETG shutter MEG,SCAN; HEG,SCAN GO # Now for focus checks with HETG at high dispersion. SAMESUITE grating HETG shutter MEG,SCAN order 3 offset_y 50.7 defocus 0.79 fam_polar 51. GO SAMESUITE grating HETG shutter HEG,SCAN order 2 offset_y 86.4 defocus 1.40 fam_polar 60. GO DEFAULT UNCORRELATE # Suite 2 # ___________________________________________________________________________ # PSF Series # First tests are simple PSF tests to examine the small scale # performance of the gratings. # Most counts are taken in integration mode, because most photons # are from the emission line. Take 20% in photon counting mode, # which goes very slowly just to make sure that no ACIS effects # cause problems. # PSFs and LRFs do not have high priority with ACIS-2C since it # isn't a flight unit and misalignments are possible. # Still, perform minimal set to verify grating performance. # Should PSFs on both chips be measured? # ___________________________________________________________________________ type PSF/Inner Core priority 9 sequence 2A source EIPS target Mg-Ka spot_size SMALL grating HETG; HETG; LETG shutter MEG,ALL; HEG,ALL; ALL,ALL CORRELATE grating shutter # at +1, we will need to move the detector. Fix later or make automatic. order 0; +1 # Need a small frame time so that 5000 counts doesn't take too # long. The window size is 18 pixels high at 0.11 s read time, # which should be enough, since the dispersion direction is more # important. To get to 0.1 count/frame, the max rate is 1.0 cps. detector frontside acis_proc_mode INTEG; PH_CNT acis_frametime .11 min_fp_counts 20000; 2000 max_fp_rate 300; 1.0 CORRELATE acis_proc_mode min_fp_counts CORRELATE acis_proc_mode max_fp_rate GO # for these orders, I have specifically computed the best 2C position. # These values should be computed by the expander software at some time. SAMESUITE order 3; 2; 5 offset_y 50.7; 86.4; 43.8 defocus 0.79; 1.40; 0.36 fam_polar 51.; 60.; 34 CORRELATE grating order CORRELATE grating offset_y CORRELATE grating defocus CORRELATE grating fam_polar GO UNCORRELATE # Suite 3 # ___________________________________________________________________________ # PSF set at high E. # repeat this PSF test with Fe-Ka but at lower priority # No need to move the 2C in first set. HEG +1 order only goes to 8.46 mm. # ___________________________________________________________________________ type PSF/Inner Core priority 7 sequence 2B target Fe-Ka grating HETG shutter MEG,ALL; HEG,ALL order +1 check_order 0 offset_y 0 defocus 0 fam_polar 0 CORRELATE acis_proc_mode min_fp_counts CORRELATE acis_proc_mode max_fp_rate GO UNCORRELATE # One location is good enough for both MEG +3 and HEG +2. SAMESUITE order 3; 2 check_order +1 offset_y 15. defocus 0.04 fam_polar 12 acis_proc_mode INTEG acis_frametime .23 min_fp_counts 20000 max_fp_rate 300 CORRELATE shutter order GO UNCORRELATE order # Suite 4 # ___________________________________________________________________________ # repeat once more with O-Ka # ___________________________________________________________________________ target O-Ka shutter MEG,ALL order 0; +1 check_order N/A detector backside offset_y 0; 51.5 defocus 0; 0.50 fam_polar 0; 40. CORRELATE order offset_y CORRELATE order defocus CORRELATE order fam_polar GO UNCORRELATE # Suite 5 # ___________________________________________________________________________ # Last of PSF series: off-axis cases. # Use the same set of off-axis angles as in Phase 1. # Assume for now that the detector will be placed properly. Fix later. # ___________________________________________________________________________ target Mg-Ka hrma_az 0; 45; 90; 0 hrma_polar 1;1.0; 3; 8.33 CORRELATE hrma_az hrma_polar grating HETG shutter MEG,ALL; HEG,ALL order 0; +1 detector frontside offset_y 0 defocus 0 fam_polar 0 GO DEFAULT UNCORRELATE # Suite 6 # ___________________________________________________________________________ # Now generate a continuum source. # Simulate ACIS-S by moving 2C around and tilting. # Lots of counts are needed for finding odd, weak spectral features. # Allow pileup in lines because continuum is most interesting. # Avoid pileup otherwise, because we want to separate orders. # For 25mm wide 2C, # resolution elements is about 25/0.05 = 500 # so to get 1000 count per res. element, need 500000 count. # We expect the Cu-Ka source to reach of order 1000 cps for a 500 s # exposure. For the plan, expect 500 cps and 1000 s exposure. # To prevent pileup, we need less than 0.1 count/pix/frame or # 0.2 count/res. elem./frame, giving 5000 frames and a frametime # of about 0.23 s. # We do not want defocussing here so that we can get the best resolution # at the edges. # Run the MEG separately from the HEG because the spectra cross when # wrapped around in the window. # Using large spot here. Decrease to improve cross dispersion shape? # ___________________________________________________________________________ type Molecular Contamination priority 9 target Cu-Ka filter1_mat NONE filter2_mat NONE voltage 20 energy 1.0 flux_line_all ALL bnd_h_stat NO min_bnd_counts 0 grating HETG shutter MEG,ALL; HEG,ALL order +1 acis_frametime 0.23 acis_proc_mode PH_CNT max_fp_rate 1000 min_fp_counts 500000 # Simulate the ACIS-S for this one test. # correlate these variables so that chip always goes to Rowland circle. # Tilts of the FAM are included using fam_polar and fam_az. detector ACIS,2C1; ACIS,2C1; ACIS,2C1; ACIS,2C0; ACIS,2C0; ACIS,2C0 offset_y -75.; -50.; -25.; 0.; 25.; 50. defocus 1.05; 0.47; 0.12; 0.; 0.12; 0.47 fam_polar 60.; 60.; 32.; 0.; 32.; 60. fam_az 180.; 180.; 180.; 0.; 0.; 0. CORRELATE detector offset_y CORRELATE detector defocus CORRELATE detector fam_polar CORRELATE detector fam_az GO DEFAULT UNCORRELATE # Suite 7 # ___________________________________________________________________________ # Since the ACIS only has one chip at a time, we must limit the number # of orders that we examine. If the energies are low, then we must # move the detector to the +1 and -1 orders. If the energy is high # then we don't have to do so. # Need to defocus in order to reduce the probability of pileup. # The defocus is where the MEG or HEG rings separate by 4 pixels, # so that the two rings don't overlap and cause additional pileup. # For the MEG (HEG) the defocus is 7.75 (11.7) mm to create an # outer ring diameter of 0.91 mm. # There are [pi*(D1+D2)*Dr] pixels in the two rings, where D1 is # 38 pixels, D2 is 31 pixels, and we take a ring thickness (Dr) # of 2 pixels (conservative, ignores scattering which broadens # the rings), then there are 440 pixels. The pileup limit is # reached at 44 count/frame if we require a limit of 10% pileup. # The ratios of the ring diameters are about 0.8, so that both the # MEG and HEG require the same size image, and, consequently, the # same ACIS-2C readout window size: 54 row. # The readtime is 0.32 s for this window size, so the pileup-limited # count rate is 140 count/s. # Assume a frametime where the number of rows is large enough # to encompass the defocussed image. # OOOOHHHHH. Here's an idea. The rings are large enough that almost # every facet can be resolved. If we increase the ring size by # a factor of 2 then we have 440 pixels around the ring, which # resolves the 108 MEG facets to about 2 pixels each. Now we # can measure the efficiency (or EA) of each facet independently. # The max fp rate is the same, since the ring is bigger but the # frame time is smaller by a similar factor. # ___________________________________________________________________________ type Effective Area grating HETG shutter MEG,ALL; HEG,ALL defocus 15.5; 23.4 CORRELATE shutter defocus order 0; +1; -1 max_fp_rate 140 acis_frametime 0.66 detector frontside min_fp_counts 10000 # Setting these up one group at a time. # Assuming that the 2C will be moved to the +/- 1 orders by expander # software, too little time to wire positions in by hand right now. # Note that we do not require tilting or further defocus to get to # the Rowland circle because we are observing these lines far from focus. # First, high energy lines observed with both gratings. sequence 2A target Mg-Ka; Si-Ka GO SAMESUITE sequence 2B target Al-Ka; Ag-La; Ti-Ka; Fe-Ka; Cu-Ka GO SAMESUITE sequence 2C target Zr-La; Mo-La; Sn-La GO # Lines below 1 keV SAMESUITE sequence 2A; 2C; 2C; 2A target O-Ka; Ni-La; Cu-La; Fe-La CORRELATE target sequence detector both GO # Line below HEG limit SAMESUITE sequence 2C target Ti-La shutter MEG,ALL defocus 15.5 detector backside GO DEFAULT UNCORRELATE # Suite 8 # ___________________________________________________________________________ # These are the EA scans which involve coarse scans with the DCM. # They repeat exactly all scans done in phase 1 (suite 23). # Only running with HETG/FI here. See also LETG/HRC case. # ___________________________________________________________________________ source DCM target N/A shutter MEG,ALL; HEG,ALL defocus 15.5; 23.4 CORRELATE shutter defocus order 0; +1; -1 max_fp_rate 140 acis_frametime 0.66 detector frontside min_fp_counts 3000 # split into three portions: small steps with TAP, small steps with Ge, # then large steps with Ge. mono_init 1.5 mono_range 0.75 mono_step 0.25 GO # small steps with Ge crystal SAMESUITE mono_init 2.5 mono_range 1.5 GO # Finally, large steps with Ge crystal # At this point, all -1 through +1 are always on the chip. SAMESUITE order 0 mono_init 4.5 mono_range 4.5 mono_step 0.5 GO # Suite 9 # ___________________________________________________________________________ # These are the EA scans which involve edge scans with the DCM. # They repeat exactly all scans done in phase 1 (suite 24). # Only running with HETG/2C here. LETG tests are done with the HRC-S. # EA survey of the Ir and Au edges with the DCM. Use fine scans # near 2 keV. # All gratings measured; the no-grating case is done by the HRMA # calibration team in phase 1. # Same setup as for the last test, just different monochromator # settings. # ___________________________________________________________________________ # First, a scan using the TAP crystal. order 0; +1; -1 min_fp_counts 3000 mono_init 1.50 mono_range 0.60 mono_step 0.050 GO # Second, a scan using the Ge crystal. SAMESUITE mono_init 2.15 mono_range 0.50 mono_step 0.050 GO DEFAULT # Suite 10 # ___________________________________________________________________________ # Next are energy scans using the HIREFS monochromator. # The first set consists of HIREFS tests. # The HIREFS is set to low resolution in # order to make up a "mini-continuum" that is restricted in # wavelength but meanwhile allows the gratings to see features # in the range of the band passed by the HIREFS. Fewer steps # are then needed to cover the entire region of interest. # At a monochromator resolution of 30 and at an energy where the HETG (MEG) # resolution is 1000, we get 1000/30 * 2 = 60 pix per mini-continuum. # Expecting no more than 50 count/s, then to avoid pileup, we need a frametime # of less than 0.1 / (50/60) = 0.12 s, so we do not have to defocus # (which would kill the approach). # Count rates are very low but should be much higher (x10 at least) because # the requested resolution is only 30, not 300. Fudging the desired total # counts to compensate. # ___________________________________________________________________________ source HIREF-W sequence 2B mono_resolution 30 grating HETG shutter MEG,ALL order 0; +1; -1 max_fp_rate 50 acis_frametime 0.1 detector backside min_fp_counts 100 # O-K region of ACIS-2C. mono_init 21 mono_step .3 mono_range 3 defocus 0 GO SAMESUITE # N-K region of HETG polyimide. mono_init 28.9 mono_step 0.5 mono_range 2.0 GO DEFAULT # Suite 11 # ___________________________________________________________________________ # Si-K and Al-K regions of ACIS. See ACIS test list for details. # Should this test be done if the ACIS team is doing it already at # priority 6? # Defocus for these tests because we cannot take advantage of making # a low resolution monochromator source spectrum. # ___________________________________________________________________________ source DCM sequence 2B target N/A mono_init 1.70 mono_range 0.200 mono_step 0.020 mono_resolution N/A grating HETG shutter HEG,ALL order 0; +1; -1 defocus 23.4 max_fp_rate 140 acis_frametime 0.66 detector both min_fp_counts 1000 GO SAMESUITE # Al-K region of 2C. mono_init 1.45 GO