HRCMODE Operations Database Element

Description

The HRCMODE ODE is a table used by the OFLS to configure the HRC based on the value of the SI_MODE parameter on the ORs for HRC observations. This table then provides an easy way to temporarily change the instrument configuration for a single observation. The table below lists the elements in a row of the HRCMODE table and the current default setting for HRC-I or HRC-S observations.

Parameter Range HRC-I Default HRC-S Default

TRIGGER_LEVEL 0-255 8 8

RANGE_SWITCH_LEVEL 0-255 115 125

SPECT_MODE NORMAL | IMAGING NORMAL NORMAL

ANTICO_ENABLE YES | NO YES NO

WIDTH_ENABLE YES | NO NO NO

WIDTH_THESHOLD 0-255 2 2

ULD_ENABLE YES | NO NO NO

UPPER_LEVEL_DISC 0-255 255 255

BLANK_ENABLE NONE | CENTER | EDGE NONE EDGE

U_BLANK_HI 0-255 255 74

V_BLANK_HI 0-255 255 255

U_BLANK_LOW 0-255 0 69

V_BLANK_LOW 0-255 0 0

PY_SHUTTER_POSITION_LSB 0-255 0 0

PY_SHUTTER_POSITION_MSB 0-255 0 0

MY_SHUTTER_POSITION_LSB 0-255 0 0

MY_SHUTTER_POSITION_MSB 0-255 0 0

Parameter	Range	HRC-I Default	HRC-S Default
TRIGGER_LEVEL	0-255	8	8
RANGE_SWITCH_LEVEL	0-255	115	125
SPECT_MODE	NORMAL \| IMAGING	NORMAL	NORMAL
ANTICO_ENABLE	YES \| NO	YES	NO
WIDTH_ENABLE	YES \| NO	NO	NO
WIDTH_THESHOLD	0-255	2	2
ULD_ENABLE	YES \| NO	NO	NO
UPPER_LEVEL_DISC	0-255	255	255
BLANK_ENABLE	NONE \| CENTER \| EDGE	NONE	EDGE
U_BLANK_HI	0-255	255	74
V_BLANK_HI	0-255	255	255
U_BLANK_LOW	0-255	0	69
V_BLANK_LOW	0-255	0	0
PY_SHUTTER_POSITION_LSB	0-255	0	0
PY_SHUTTER_POSITION_MSB	0-255	0	0
MY_SHUTTER_POSITION_LSB	0-255	0	0
MY_SHUTTER_POSITION_MSB	0-255	0	0

Brief descriptions of each of these items follows:

TRIGGER_LEVEL - the threshold above which the MCP signal must go to be considered an event
RANGE_SWITCH_LEVEL - the switching threshold of the on-board amplifiers on the front-end of the ADCs that digitize the crossed-grid charge detector signals
SPECT_MODE - "IMAGING" changes the HRC-S readout so that only events from the center segment are telemetered
ANTICO_ENABLE - enable of on-board vetoing of MCP events that are coincident with an event in the anticoincidence counter
WIDTH_ENABLE - enable of on-board vetoing of MCP events that exceed the width threshold (WIDTH_THESHOLD) setting
WIDTH_THESHOLD - the threshold of the maximum number of coarse positions along one of the axes that can be above threshold without being flagged
ULD_ENABLE - enable of on-board vetoing of MCP events that exceed the upper level discriminator
UPPER_LEVEL_DISC - upper level discriminator value
Blanking Region Parameters
- BLANK_ENABLE - type of blanking, on-board vetoing of events within a rectangular region, to enable
- U_BLANK_HI, V_BLANK_HI, U_BLANK_LOW, V_BLANK_LOW - boundaries of the rectangular blanking region; inclusive for center-blanking - exclusive for edge-blanking. A value of 64 must be added to the desired coarse position for the U- and V-axes of the HRC-I and to the desired U-axis of the HRC-S.
Focus Shutter Positon Parameters (16 motor steps per degree)
- PY_SHUTTER_POSITION_LSB, PY_SHUTTER_POSITION_MSB - high and low bytes of the number of motor steps away from "Home" that the +Y focus shutter should be moved
- MY_SHUTTER_POSITION_LSB, MY_SHUTTER_POSITION_MSB - high and low bytes of the number of motor steps away from "Home" that the -Y focus shutter should be moved

History of Default Value Changes

Date	Change
1999-09-02	ANTICO_ENABLE for HRC-I from NO to YES
1999-10-21	BLANK_ENABLE for HRC-S from NONE to EDGE U_BLANK_HI for HRC-S from 255 to 74 U_BLANK_LOW for HRC-S from 0 to 69
1999-12-06	RANGE_SWITCH_LEVEL for HRC-I from 90 to 115 for HRC-S from 90 to 125
2000-10-05	WIDTH_THRESHOLD for HRC-I from 3 to 2 for HRC-S from 3 to 2

Defined HRCMODEs

The following table describes the currently defined HRCMODE ODE entries

Mode Mnemonic Description

DEFAULT Default set-up; used if no mode is explicitly given.

ANTICOVT Enable on-board anticoincidence shield vetoing

S_TIMING HRCMODE used with HRC-S for high-precision timing observations. Set TRIGGER_LEVEL to 21, set SPECT_MODE to IMAGING, and disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255

SZEROBLK Move shutters to block the LETG zero order on the HRC-S

SCENTER Set up edge blanking on the HRC-S to send only the events on the center MCP segment (coarse V 65-127)

SNWING Set up edge blanking on the HRC-S to send only the events on the -Y MCP segment (coarse V 128-255)

SPWING Set up edge blanking on the HRC-S to send only the events on the +Y MCP segment (coarse V 0-64)

SLETGN Set up edge blanking on the HRC-S to send only the events in a strip along the LETG dispersion direction centered on the nominal aim-point (coarse U 5-10: U_BLANK_LOW=69 U_BLANK_HI=74)
This is currently equivalent to the HRC-S default set-up

SLETGL Set up edge blanking on the HRC-S to send only the events in a strip along the LETG dispersion direction centered on the LESF aim-point (coarse U 9 and up: U_BLANK_LOW=73 U_BLANK_HI=255)

IQUAD1 Move shutters to define quadrant 1 of the HRC-I focus tests

IQUAD2 Move shutters to define quadrant 2 of the HRC-I focus tests

IQUAD3 Move shutters to define quadrant 3 of the HRC-I focus tests

IQUAD4 Move shutters to define quadrant 4 of the HRC-I focus tests

SQUAD1 Move shutters to define quadrant 1 of the HRC-S focus tests

SQUAD2 Move shutters to define quadrant 2 of the HRC-S focus tests

SQUAD3 Move shutters to define quadrant 3 of the HRC-S focus tests

SQUAD4 Move shutters to define quadrant 4 of the HRC-S focus tests

IQSIM1 Move shutters to define quadrant 1 of the SIM tilt test

IQSIM2 Move shutters to define quadrant 2 of the SIM tilt test

IQSIM3 Move shutters to define quadrant 3 of the SIM tilt test

IQSIM4 Move shutters to define quadrant 4 of the SIM tilt test

RS_125 Set RANGE_SWITCH_LEVEL to 125

RS_115 Set RANGE_SWITCH_LEVEL to 115

SN_RS125 Combination of SNWING and RS_125

OBS00590 Special configuration for a series of HRC-S/LETG comet observations (coarse u 4-12, coarse v 0-255)

OBS00758 Special configuration for OBSID 758 (coarse u 5-12, coarse v 95-102)

OBS00759 Special configuration for OBSID 759 (coarse u 5-12, coarse v 46-151)

NOVETO Disable on-board anticoincidence shield vetoing

ILLD Disable on-board anticoincidence shield vetoing and set TRIGGER_LEVEL to 64

NOBLANK Disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255

SLLD Set TRIGGER_LEVEL to 21 and disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255

SLLD2 Set TRIGGER_LEVEL to 48 and disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255

SIMG Set SPECT_MODE to IMAGING and disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255

SIMGLLD1 Set TRIGGER_LEVEL to 21, set SPECT_MODE to IMAGING, and disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255

SIMGLLD2 Set TRIGGER_LEVEL to 48, set SPECT_MODE to IMAGING, and disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255

OBS04286 Special configuration for OBSID 4286, HRC-I off-axis, next-in-line observation of RXJ1856.5-3754 (edge-blank: coarse u 25-34, coarse v 25-34)

OBS04356 Special configuration for OBSID 4356, HRC-I off-axis, next-in-line observation of RXJ1856.5-3754 (edge-blank: coarse u 36-45, coarse v 7-16)

OBS03831 Special configuration for OBSID 3831, HRC-S high-precision timing with the shutters positioned to block ~3/4 of the photons from an on-axis source

OBS04411 Special configuration for OBSID 4411, HRC-I off-axis, next-in-line observation of RXJ1856.5-3754 (edge-blank: coarse u 6-15, coarse v 37-46)

OBS06094 Special configuration for OBSID 6094, HRC-I off-axis, next-in-line observation of RXJ1856.5-3754 (edge-blank: coarse u 13-20, coarse v 13-20)

OBS06095 Special configuration for OBSID 6095, HRC-I off-axis, next-in-line observation of RXJ1856.5-3754 (edge-blank: coarse u 34-47, coarse v 35-48)

OBS09715 Special configuration for OBSID 9715, HRC-I off-axis, next-in-line observation of 31 Com (edge-blank: coarse u 14-19, coarse v 14-19)

OBS12203 Special configuration for OBSID 12203, reduced-width spectroscopy strip using only the center segment (edge-blank: coarse u 6-9, coarse v 65-127)

OBS12229 Special configuration for Crab pulsar pathfinder

OBS13121 Special configuration for second Crab pulsar pathfinder

OBS11245 Special configuration for OBSID 11245, Crab pulsar using elevated trigger level to obtain high-precision timing

OBS17377 Special configuration for OBSID 17377, HRC-I off-axis, next-in-line observation of ProxCen (edge-blank: coarse u 26-33, coarse v 26-33)

OBS20743 Special configuration for OBSID 20743, HRC-I on-axis, faint source. SIMODE is designed to reduce telemetered background by 11%. (edge-blank: coarse u 5-55, coarse v 5-55)

Mode Mnemonic	Description
DEFAULT	Default set-up; used if no mode is explicitly given.
ANTICOVT	Enable on-board anticoincidence shield vetoing
S_TIMING	HRCMODE used with HRC-S for high-precision timing observations. Set TRIGGER_LEVEL to 21, set SPECT_MODE to IMAGING, and disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255
SZEROBLK	Move shutters to block the LETG zero order on the HRC-S
SCENTER	Set up edge blanking on the HRC-S to send only the events on the center MCP segment (coarse V 65-127)
SNWING	Set up edge blanking on the HRC-S to send only the events on the -Y MCP segment (coarse V 128-255)
SPWING	Set up edge blanking on the HRC-S to send only the events on the +Y MCP segment (coarse V 0-64)
SLETGN	Set up edge blanking on the HRC-S to send only the events in a strip along the LETG dispersion direction centered on the nominal aim-point (coarse U 5-10: U_BLANK_LOW=69 U_BLANK_HI=74) This is currently equivalent to the HRC-S default set-up
SLETGL	Set up edge blanking on the HRC-S to send only the events in a strip along the LETG dispersion direction centered on the LESF aim-point (coarse U 9 and up: U_BLANK_LOW=73 U_BLANK_HI=255)
IQUAD1	Move shutters to define quadrant 1 of the HRC-I focus tests
IQUAD2	Move shutters to define quadrant 2 of the HRC-I focus tests
IQUAD3	Move shutters to define quadrant 3 of the HRC-I focus tests
IQUAD4	Move shutters to define quadrant 4 of the HRC-I focus tests
SQUAD1	Move shutters to define quadrant 1 of the HRC-S focus tests
SQUAD2	Move shutters to define quadrant 2 of the HRC-S focus tests
SQUAD3	Move shutters to define quadrant 3 of the HRC-S focus tests
SQUAD4	Move shutters to define quadrant 4 of the HRC-S focus tests
IQSIM1	Move shutters to define quadrant 1 of the SIM tilt test
IQSIM2	Move shutters to define quadrant 2 of the SIM tilt test
IQSIM3	Move shutters to define quadrant 3 of the SIM tilt test
IQSIM4	Move shutters to define quadrant 4 of the SIM tilt test
RS_125	Set RANGE_SWITCH_LEVEL to 125
RS_115	Set RANGE_SWITCH_LEVEL to 115
SN_RS125	Combination of SNWING and RS_125
OBS00590	Special configuration for a series of HRC-S/LETG comet observations (coarse u 4-12, coarse v 0-255)
OBS00758	Special configuration for OBSID 758 (coarse u 5-12, coarse v 95-102)
OBS00759	Special configuration for OBSID 759 (coarse u 5-12, coarse v 46-151)
NOVETO	Disable on-board anticoincidence shield vetoing
ILLD	Disable on-board anticoincidence shield vetoing and set TRIGGER_LEVEL to 64
NOBLANK	Disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255
SLLD	Set TRIGGER_LEVEL to 21 and disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255
SLLD2	Set TRIGGER_LEVEL to 48 and disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255
SIMG	Set SPECT_MODE to IMAGING and disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255
SIMGLLD1	Set TRIGGER_LEVEL to 21, set SPECT_MODE to IMAGING, and disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255
SIMGLLD2	Set TRIGGER_LEVEL to 48, set SPECT_MODE to IMAGING, and disable Edge/Center-blanking and set blanking region to U:0-255, V:0-255
OBS04286	Special configuration for OBSID 4286, HRC-I off-axis, next-in-line observation of RXJ1856.5-3754 (edge-blank: coarse u 25-34, coarse v 25-34)
OBS04356	Special configuration for OBSID 4356, HRC-I off-axis, next-in-line observation of RXJ1856.5-3754 (edge-blank: coarse u 36-45, coarse v 7-16)
OBS03831	Special configuration for OBSID 3831, HRC-S high-precision timing with the shutters positioned to block ~3/4 of the photons from an on-axis source
OBS04411	Special configuration for OBSID 4411, HRC-I off-axis, next-in-line observation of RXJ1856.5-3754 (edge-blank: coarse u 6-15, coarse v 37-46)
OBS06094	Special configuration for OBSID 6094, HRC-I off-axis, next-in-line observation of RXJ1856.5-3754 (edge-blank: coarse u 13-20, coarse v 13-20)
OBS06095	Special configuration for OBSID 6095, HRC-I off-axis, next-in-line observation of RXJ1856.5-3754 (edge-blank: coarse u 34-47, coarse v 35-48)
OBS09715	Special configuration for OBSID 9715, HRC-I off-axis, next-in-line observation of 31 Com (edge-blank: coarse u 14-19, coarse v 14-19)
OBS12203	Special configuration for OBSID 12203, reduced-width spectroscopy strip using only the center segment (edge-blank: coarse u 6-9, coarse v 65-127)
OBS12229	Special configuration for Crab pulsar pathfinder
OBS13121	Special configuration for second Crab pulsar pathfinder
OBS11245	Special configuration for OBSID 11245, Crab pulsar using elevated trigger level to obtain high-precision timing
OBS17377	Special configuration for OBSID 17377, HRC-I off-axis, next-in-line observation of ProxCen (edge-blank: coarse u 26-33, coarse v 26-33)
OBS20743	Special configuration for OBSID 20743, HRC-I on-axis, faint source. SIMODE is designed to reduce telemetered background by 11%. (edge-blank: coarse u 5-55, coarse v 5-55)

Dr, Dan Patnaude
Harvard-Smithsonian Center for Astrophysics
60 Garden Street, Mail Stop 03
Cambridge, MA 02138, USA
Ph.: (617) 496-2087
Fax: (617) 495-7356
E-mail: dpatnaude@cfa.harvard.edu