# phase 2H # Version 1 # # Start of an expander file for grating-ACIS tests # First clear all values to the null string CLEAR # Now set some initial values that are rarely changed INCLUDE default2_acis.include DEFAULT # Set a few parameters that won't change from test to test name ASC/HLM & HETG/DD sequence 2A priority 10 # Suite 1 #__________________________________________________________________ # Mg PSF / chip geometry # # Use the Mg line to do FCs and PSF images to verify all ACIS # S chips are placed on Rowland circle. Essential to have ACIS! # PSF in focus and some off-axis # LETG PSFs too # EA defocussed, without grating too #__________________________________________________________________ priority 10 # This portion taken straight from ACIS Focus test suite. # XSS data KEEP DCM AVAILABLE IN CASE... source EIPS spot_size SMALL target Al-Ka # First of suite is a focus check series. Difference between these # and PSF series is that FC tests are run in INTEG mode and shutters # are scanned. By running INTEG mode and a high count rate, only one # chip has useful data, so a chip is specified that has the desired order. # These PSF tests are now doubling as Focus Checks type PSF/Inner Core priority 10 voltage APT grating HETG shutter ALL,SCAN # order is not used because both MEG and HEG are used. order 0 # These take longer because the chip mode is different and all chips # are important. detector ACIS,S3 acis_proc_mode PH_CNT acis_frametime 3.3 # This parameter block is used when we are concerned about # regions that hit the DN limit of 4096. All events with >3 # pixels above 4096 will be rejected. These are only piled up # events where the original energy total is unrecoverable. acis_parblock xfaint_amp_s.te # Maximum count rate is set to limit pileup to <30% in desired order: # 1 count/frame / 3.3 s/frame gives 0.3 count/s # Therefore, target 0.3 count/s in highest order, which is MEG +/-1. # The MEG +/- 1 order is 1.5 times brighter than the MEG and HEG # combined 0th orders, so limit 0th order to 0.2 cps. # At 0.2 cps, no other orders give 10000 cnt, so run again at # higher rates until 1000 cnt is reached in the fainter orders. # The telemetry limit is reached at 20 cps in 0th order, accounting for # all other orders. # Aim for 1/4 of all counts in each shutter integration. max_fp_rate .2; 0.5; 1.0; 3.0; 10 min_fp_counts 500; 750; 750; 1000; 2500 # pred'd in 0: 2000; 3000; 3000; 4000; 10000 # pred'd in +1: 3000; 4500; 4500; 6000; 15000 # tot in +/-1: 6000; 9000; 9000; 12000; 30000 # tot in +/-3: 400; 600; 600; 800; 2000 combine all tests: 4400 CORRELATE max_fp_rate min_fp_counts GO SAMESUITE grating LETG # We can increase the rate for the LETG observations by using a subarray # of 256 pix. The parameter block has to be changed, however. # The smaller array is read out in only 0.9 s. # Max rate is 1.0 count/frame in 1st order * 0.9/1.2 (ratio of 0th to +1) # / (0.9s/frame) = 0.8 count/s # In this case, the maximum rate in 0th order is 30 cps. acis_frametime 0.91 max_fp_rate .8; 2; 5; 10; 30 min_fp_counts 2000; 2500; 5000; 5000; 20000 # pred'd in 0: 8000; 10000; 20000; 20000; 80000 # pred'd in +1: 10000; 13000; 25000; 25000; 100000 # tot in +/-1: 20000; 26000; 50000; 50000; 200000 # tot in +/-7: 400; 500; 1000; 1000; 4000 combine all tests: 6900 # tot in +/-10: 200; 250; 500; 500; 2000 combine all tests: 3500 acis_parblock xfaint_letg_s.te GO # Now for some off-axis PSFs. # Need low rate in 0th order to prevent pileup in +/-1 orders. # As we go off-axis, the count rate limit decreases because the # photon distribution is more diffuse. # In a diffuse image, however, we only want 0.1 count/pix/frame, # due to the collision with adjacent pixels and the change of grades. # This gives 0.1/3.3s = 0.033 cnt/pix/s in a dispersed image at max. # At 6', the images are 40 pix in area, so rate lim is increased to 1.3 cps. # At 10', the images are 300 pix in area, so rate lim is increased to 10 cps. # In 0th order, however, reduce by a factor of 1.5 to give 0th order rate. # Position at 3' simulates the backup position for the 0th order if # the BI becomes unusable in flight. Examine high orders primarily, # because the inner orders should be undiscernably different. Therefore, # the count rate can be increased. SAMESUITE grating HETG shutter ALL,ALL acis_frametime 3.3 acis_parblock xfaint_s.te hrma_az 0; 45; 180 hrma_polar 3; 6; 10 max_fp_rate 1.0; 0.9; 7 min_fp_counts 5000; 3000; 10000 CORRELATE max_fp_rate hrma_az CORRELATE max_fp_rate hrma_polar GO UNCORRELATE hrma_az UNCORRELATE hrma_polar hrma_az 0 hrma_polar 0 # Suite 2 #__________________________________________________________________ # Mg Effective Area / Efficiency # _________________________________________________________________ # Finally, get a version good for EAs -- no pileup even in 1st order. # For this test and for other EA tests, see off-line plots of # maximum rate vs. energy and target counts vs. E. # For Mg, we see that 0th order is very weak compared to the dispersed # orders, so we need 25 cps in order to get 150 cps in the total of # all dispersed orders. # For a defocus of 40 mm, the pileup limit is 90 cps in a given order. # so dispersed orders (which must sum to less than 50% of the T/M # limit) will not be piled if the T/M limit is satisfied. # For all cases for E<4 keV, the defocus has to be decreased to # prevent orders from colliding, so the pileup limit may be reached. type Effective Area grating HETG bnd_h_stat YES defocus 40 max_fp_rate 25 min_fp_counts 10000 acis_parblock xfaint_amp_s.te GO SAMESUITE grating LETG acis_parblock xfaint_letg_s.te GO DEFAULT UNCORRELATE # Suite 3 #__________________________________________________________________ # Continuum tests # # The Cu continuum test was blurred so would be good to repeat it. # Also the C test may not have had sufficient counts. These tests # are relevant with ACIS and (on I as well as S array) these # spectra would also give useful chip performance information. # Consider telemetry limits, pileup # Separate HEG/MEG'; take data in full frame "normal" mode and # also in continous readout mode (flux can be higher by turning # up current but make no voltage/filter changes to have same # spectral shape.) # Lots of counts are needed for finding odd, weak spectral features. # but there is a telemetry limit of about 200 cps in normal TE mode, # so we use continuous clocking mode here. Maximum rate is about # 500 cps from all chips in this mode. # HEG and MEG are not distinguishable in CC mode, so used shutters. # In phase 2G, we achieved a rate of less than .2 count/frame/pixel # in the continuum away from the bright Cu-Ka and Cu-La lines # at a current of 0.2 mA with the Cu-K anode at 20 kV. The frame # time was 0.23 s for a rate of 1 cps/pixel. This was the maximum # rate, peaking in the high E region, which comprises less than 30% # of the total spectrum. The count rates were a factor of 10 less # in most of the remainder. If we account for the total count rate # to be a factor of 3 less than the max, then the total rate is 2000 # cps in 6 chips. We can reduce this to 1000 cps by cutting the current # to the minimum, 0.1 mA but to get another factor of 2, we may need # to drop the voltage. Plan for 15 kV. # NEED TO WINDOW OUT 0TH ORDER TO AVOID HAVING IT DOMINATE THE T/M STREAM. # We expect the C-Ka source to give 1 cps @ 1.7 keV at 0.2mA for MEG/2C1 # ___________________________________________________________________________ type Molecular Contamination priority 10 source EIPS target Cu-Ka filter1_mat NONE filter2_mat NONE voltage 15 flux_line_all ALL bnd_h_stat NO CORRELATE grating shutter CORRELATE grating max_fp_rate CORRELATE grating min_fp_rate grating HETG; HETG; LETG shutter HEG,ALL; MEG,ALL; ALL,ALL order 0 # this frametime is appropriate for continuous clocking mode. # Remember, default processing mode is PH_CNT. acis_frametime 0.0032 # ACIS continuous clocking mode is read mode 4. No on-chip summing # is applied. acis_read_mode 4 acis_parblock xfaint_win_s.cc # This rate setting will ensure a very low current, near 0.1 mA. # SET FP RATES HERE. max_fp_rate 11000; 15000; 28000 min_fp_rate 8000; 12000; 25000. min_fp_counts APT defocus 0 integ_time 3000 atomic_time_list 3000 # Run test three times to make sure that gaps are covered twice # so that we can avoid minor features in detector. offset_y 0; -1; +1 GO SAMESUITE # Run a similar test at C-K, for good low E continuum. # Run all gratings again because we can retrieve the regions saturated # by the bright Cu-La line in the C-K continuum. target C-Ka voltage 15 priority 9 # SET FP RATES HERE. max_fp_rate 5000; 15000; 25000 min_fp_rate 4000; 12000; 20000. GO DEFAULT UNCORRELATE # Suite 4 #__________________________________________________________________ # HIREFS discrete energies in low-energy range # # An important range to calibrate with the flight ACIS (including # OBF, real chips), some phase 1 grating data. # e.g., 0.7,0.8,0.9,1.0,1.1,1.2 and/or HRC HIREFS energies # # [If HIREFS is not feasible then O-K Fe-L Cu-L get elevated # in priority ] #__________________________________________________________________ type Effective Area priority 10 source HIREF-W # PICK ENERGIES USED PREVIOUSLY TO AVOID RAS LINES mono_init 18; 16; 14; 12; 11; 10 mono_step 0 mono_range N/A filter1_mat NONE filter2_mat NONE grating HETG shutter ALL,ALL # Remember include file sets many ACIS defaults defocus 40 # For low E region, rate is dominated by 0th order, which comprises 50% # of the total counts. Limit is set by pileup in 0th order. max_fp_rate 40 min_fp_counts 10000 GO DEFAULT UNCORRELATE # Suite 5 #__________________________________________________________________ # EA and High-order efficiencies at Ti-K and Al-K # # Measure out to relevant orders for some EIPS lines to # have order calibration for use with ACIS and HRC. (For # ACIS we need to understand the size of the PHA-tails of the # lines which will not be order-separated.) # Defocussed, separate HEG and MEG tests. # Orders to measure (simultaneously): # Ti-K Al-K # HEG 1-6 1-2 # MEG 1-13 1-4 # Notes by HLM: # Al-K is used in suite 1 for Focus, PSF, and EA tests, so use Mg-K here. # Max rate for Al-K is set by +1 order; for Ti-K it is 0th order. #__________________________________________________________________ type Effective Area source EIPS target Ti-Ka; Mg-Ka priority 8 # decrease defocus for Ti-Ka in order to allow for smaller dispersion # so that rings don't overlap. TiK 0th order is pileup limited. defocus 33; 40 CORRELATE target defocus CORRELATE target max_fp_rate CORRELATE target min_fp_counts max_fp_rate 70; 20 min_fp_counts 20000; 10000 GO # Note that DEFAULT and UNCORRELATE are not performed here! # The next series is very similar to this one # Suite 6 #__________________________________________________________________ # Other Effective areas and high orders: O-K, Fe-L, Cu-L, Si-K, Fe-K, Cu-K # (3 EIPS targets) # # We have these from 2C already however absolute calibration is # so important we should do them with flight ACIS. # These lines would also give higher orders. #__________________________________________________________________ target O-Ka; Fe-La; Cu-La; Si-Ka; Fe-Ka; Cu-Ka priority 10 defocus 40; 40; 40; 40; 20; 19 max_fp_rate 50; 50; 50; 20; 40; 35 min_fp_counts 10000; 10000; 10000; 10000; 40000; 50000 GO DEFAULT UNCORRELATE # Added by HLM # Suite 7 #__________ # EA and high order tests using DCM. # Here we are trying to use the DCM to see the regions between the lines # (as in the 2C scattering tests at 1.775 keV) and high order efficiency # ratios. # Allow pileup in all lines; rates are based on telemetry limit of 200 cps. # For the low E lines, 0th order is small but for high E, 0th order dominates. # ENERGY SETTINGS SHOULD BE REEXAMINED #__________ type Scattering priority 7 source DCM target N/A # First set is for TAP crystal. # There are lines at 1.38 and 2.02 keV mono_init 1.38 mono_step 0 mono_range N/A filter1_mat NONE filter2_mat NONE # run at two flux levels. # First level is the minimum achievable and should give nice order ratios # and a normalization of the lines since they will not be severely piled. # Second level is the maximum achievable and is used for scattering test. # The lines will be heavily piled up so the t/m limit is not reached. max_fp_rate 10; 100 min_fp_counts 10000; 100000 CORRELATE max_fp_rate min_fp_counts GO SAMESUITE mono_init 2.02 max_fp_rate 35; 330 min_fp_counts 35000; 330000 GO # Second spec is for Ge crystal. # No lines at these energies # Out at high E, 0th order is > 50% of the total flux, so it's rate # can be high without significant filling the telemetry. # A low rate is chosen so that pileup in +1 and higher orders is minimized. SAMESUITE mono_init 4. mono_step 1.0 mono_range 5.0 max_fp_rate 35; 300 min_fp_counts 35000; 300000 GO UNCORRELATE # New suite as of 4/15/97 # Suite 8 #____________________ # DCM scans to measure EAs #____________________ type Effective Area priority 9 defocus 40 # Below 4 keV, we can use a defocus of 40 mm, so the images are not # limited by pileup. Instead, the 0th order is limited by the telemetry # limit of 180 count/s. We target a rate that would give 150 cps. # The actual count rate limit depends on energy in this region. # The TAP energy range is broken up into manageable sections that # avoid lines and where the DCM flux is not wildly varying (more # a factor of 2). max_fp_rate 40 min_fp_counts 10000 mono_init 0.95 mono_range 0.20 mono_step 0.05 GO # This is one of two regions where the 0th order gives fewer counts # than the dispersed +/-1 orders. SAMESUITE max_fp_rate 40 mono_init 1.2 mono_range 0.20 mono_step 0.05 GO # And this is the other region. SAMESUITE max_fp_rate 20 mono_init 1.40 mono_range 0.30 mono_step 0.03 GO SAMESUITE max_fp_rate 30 mono_init 1.86 mono_range 0.14 mono_step 0.02 GO SAMESUITE max_fp_rate 60 min_fp_counts 15000 mono_init 2.05 mono_range 0.30 mono_step 0.030 GO # The remaining tests use the Ge crystal SAMESUITE max_fp_rate 60 min_fp_counts 15000 mono_init 2.5 mono_range 1.5 mono_step 0.15 GO # For the high energy points, we need to decrease the # image size by defocussing less. # Above 4 keV, the 0th order begins to dominate the total # count rate and the pileup limit on 0th order determines the # maximum rate in 0th order. SAMESUITE defocus 30 max_fp_rate 70 min_fp_counts 15000 mono_init 4.0 mono_range 1.0 mono_step 0.2 GO SAMESUITE defocus 20 max_fp_rate 45 min_fp_counts 30000 mono_init 5.0 mono_range 2.0 mono_step 0.25 GO SAMESUITE # Watch out for the 8.45 keV lines in this set. defocus 15 max_fp_rate 35 min_fp_counts 50000 mono_init 7.2 mono_range 1.5 mono_step 0.50 GO