Detector Signals - Revision history

Amujahid at 22:50, February 15, 2023

2023-02-15T22:50:37Z

← Older revision		Revision as of 22:50, February 15, 2023
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	Gammasphere detectors give data back through specific signals. The main signals are called GeCenter, GeSides, BGOSum, and now, after upgrades, BGOPatterns. These signals are defined by the way gamma-rays hit different parts of the [[High Purity Germanium (HPGe)\|HPGe]] inside a detector. The different points where the HPGe can be hit are called "contact points".		Gammasphere [[Gammasphere Detectors\|detectors]] give data back through specific signals. The main signals are called GeCenter, GeSides, BGOSum, and now, after upgrades, BGOPatterns. These signals are defined by the way gamma-rays hit different parts of the [[High Purity Germanium (HPGe)\|HPGe]] inside a detector. The different points where the HPGe can be hit are called "contact points".

	==GeCenter==		==GeCenter==

Amujahid: /* Clean/Dirty Signals */

2023-02-15T19:04:37Z

Clean/Dirty Signals

← Older revision		Revision as of 19:04, February 15, 2023
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	The BGOPattern channel of the SBX uses two ranks of analog switch plus a set of discriminators to generate a wide variety of signal possibilities.		The BGOPattern channel of the SBX uses two ranks of analog switch plus a set of discriminators to generate a wide variety of signal possibilities.

	==Clean/Dirty ~~Signals~~==		==Clean/Dirty Events==
	Should the gamma-ray scatter within the Ge portion of the detector, the scatter will normally be detected by interaction with the BGO shields. Thus we define a 'clean' event as one that excites the Ge but none of the surrounding BGO of a given detector and a 'dirty' event as one in which both the Ge and BGO light up. Within the digitizing data acquisition system, the sum of all 7 BGO signals is applied to one digitizer channel and the Ge center contact is digitized by another channel in the same digitizer. A discriminator threshold is applied to both signals and the Router trigger module looks at the time relationship between Ge discriminator bits and the associated BGO Sum discriminator bits. If the two discriminator bits are close enough in time the event is marked as 'dirty'.		Should the gamma-ray scatter within the Ge portion of the detector, the scatter will normally be detected by interaction with the BGO shields. Thus we define a 'clean' event as one that excites the Ge but none of the surrounding BGO of a given detector and a 'dirty' event as one in which both the Ge and BGO light up. Within the digitizing data acquisition system, the sum of all 7 BGO signals is applied to one digitizer channel and the Ge center contact is digitized by another channel in the same digitizer. A discriminator threshold is applied to both signals and the Router trigger module looks at the time relationship between Ge discriminator bits and the associated BGO Sum discriminator bits. If the two discriminator bits are close enough in time the event is marked as 'dirty'.

Amujahid at 19:03, February 15, 2023

2023-02-15T19:03:24Z

← Older revision		Revision as of 19:03, February 15, 2023
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	==BGOPattern==		==BGOPattern==
	The BGOPattern channel of the SBX uses two ranks of analog switch plus a set of discriminators to generate a wide variety of signal possibilities.		The BGOPattern channel of the SBX uses two ranks of analog switch plus a set of discriminators to generate a wide variety of signal possibilities.

			==Clean/Dirty Signals==
			Should the gamma-ray scatter within the Ge portion of the detector, the scatter will normally be detected by interaction with the BGO shields. Thus we define a 'clean' event as one that excites the Ge but none of the surrounding BGO of a given detector and a 'dirty' event as one in which both the Ge and BGO light up. Within the digitizing data acquisition system, the sum of all 7 BGO signals is applied to one digitizer channel and the Ge center contact is digitized by another channel in the same digitizer. A discriminator threshold is applied to both signals and the Router trigger module looks at the time relationship between Ge discriminator bits and the associated BGO Sum discriminator bits. If the two discriminator bits are close enough in time the event is marked as 'dirty'.

	==Electric Honeycomb==		==Electric Honeycomb==
	[[File:ElectricHoneycombLabeled.png\|500px\|thumb\|Figure 1. Hit detector A, with surrounding detectors B, C, D, E, and F detecting its scatter.]]		[[File:ElectricHoneycombLabeled.png\|500px\|thumb\|Figure 1. Hit detector A, with surrounding detectors B, C, D, E, and F detecting its scatter.]]
	The Electric Honeycomb concept is an intended function of the BGO Pattern signal path to provide information regarding cross-detector scattering to the trigger. It was implemented for better suppression of Compton-scattered events, in which the fast discriminator bits from the 7 BGO segments of each detector (six shields plus back plug), plus the six individual BGO discriminator bits that are face-to-face with the BGO shields, be combined. Figure 1 to the right demonstrates this concept, with detector A (the detector hit by a gamma ray) being paired with its surrounding detectors for data acquisition in order to suppress the scattering.		The Electric Honeycomb concept is an intended function of the BGO Pattern signal path to provide information regarding cross-detector scattering to the trigger. It was implemented for better suppression of Compton-scattered events, in which the fast discriminator bits from the 7 BGO segments of each detector (six shields plus back plug), plus the six individual BGO discriminator bits that are face-to-face with the BGO shields, be combined. Figure 1 to the right demonstrates this concept, with detector A (the detector hit by a gamma ray) being paired with its surrounding detectors for data acquisition in order to suppress the scattering.

Amujahid at 19:01, February 15, 2023

2023-02-15T19:01:12Z

← Older revision		Revision as of 19:01, February 15, 2023
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	==Electric Honeycomb==		==Electric Honeycomb==
	[[File:ElectricHoneycombLabeled.png\|~~600px~~\|thumb\|Figure 1. Hit detector A, with surrounding detectors B, C, D, E, and F detecting its scatter.]]		[[File:ElectricHoneycombLabeled.png\|500px\|thumb\|Figure 1. Hit detector A, with surrounding detectors B, C, D, E, and F detecting its scatter.]]
	The Electric Honeycomb concept is an intended function of the BGO Pattern signal path to provide information regarding cross-detector scattering to the trigger. It was implemented for better suppression of Compton-scattered events, in which the fast discriminator bits from the 7 BGO segments of each detector (six shields plus back plug), plus the six individual BGO discriminator bits that are face-to-face with the BGO shields, be combined. Figure 1 to the right demonstrates this concept, with detector A (the detector hit by a gamma ray) being paired with its surrounding detectors for data acquisition in order to suppress the scattering.		The Electric Honeycomb concept is an intended function of the BGO Pattern signal path to provide information regarding cross-detector scattering to the trigger. It was implemented for better suppression of Compton-scattered events, in which the fast discriminator bits from the 7 BGO segments of each detector (six shields plus back plug), plus the six individual BGO discriminator bits that are face-to-face with the BGO shields, be combined. Figure 1 to the right demonstrates this concept, with detector A (the detector hit by a gamma ray) being paired with its surrounding detectors for data acquisition in order to suppress the scattering.

Amujahid: /* Electric Honeycomb */

2023-02-15T16:32:35Z

Electric Honeycomb

← Older revision		Revision as of 16:32, February 15, 2023
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	==Electric Honeycomb==		==Electric Honeycomb==
	[[File:ElectricHoneycombLabeled.png\|600px\|thumb]]		[[File:ElectricHoneycombLabeled.png\|600px\|thumb\|Figure 1. Hit detector A, with surrounding detectors B, C, D, E, and F detecting its scatter.]]
	The Electric Honeycomb concept is an intended function of the BGO Pattern signal path to provide information regarding cross-detector scattering to the trigger. It was implemented for better suppression of Compton-scattered events, in which the fast discriminator bits from the 7 BGO segments of each detector (six shields plus back plug), plus the six individual BGO discriminator bits that are face-to-face with the BGO shields, be combined.		The Electric Honeycomb concept is an intended function of the BGO Pattern signal path to provide information regarding cross-detector scattering to the trigger. It was implemented for better suppression of Compton-scattered events, in which the fast discriminator bits from the 7 BGO segments of each detector (six shields plus back plug), plus the six individual BGO discriminator bits that are face-to-face with the BGO shields, be combined. Figure 1 to the right demonstrates this concept, with detector A (the detector hit by a gamma ray) being paired with its surrounding detectors for data acquisition in order to suppress the scattering.

Amujahid: /* Electric Honeycomb */

2023-02-15T16:25:34Z

Electric Honeycomb

← Older revision		Revision as of 16:25, February 15, 2023
Line 12:		Line 12:

	==Electric Honeycomb==		==Electric Honeycomb==
	[[File:ElectricHoneycombLabeled.png\|thumb]]		[[File:ElectricHoneycombLabeled.png\|600px\|thumb]]
	The Electric Honeycomb concept is an intended function of the BGO Pattern signal path to provide information regarding cross-detector scattering to the trigger. It was implemented for better suppression of Compton-scattered events, in which the fast discriminator bits from the 7 BGO segments of each detector (six shields plus back plug), plus the six individual BGO discriminator bits that are face-to-face with the BGO shields, be combined.		The Electric Honeycomb concept is an intended function of the BGO Pattern signal path to provide information regarding cross-detector scattering to the trigger. It was implemented for better suppression of Compton-scattered events, in which the fast discriminator bits from the 7 BGO segments of each detector (six shields plus back plug), plus the six individual BGO discriminator bits that are face-to-face with the BGO shields, be combined.

Amujahid: /* Electric Honeycomb */

2023-02-15T16:25:21Z

Electric Honeycomb

← Older revision		Revision as of 16:25, February 15, 2023
Line 12:		Line 12:

	==Electric Honeycomb==		==Electric Honeycomb==
			[[File:ElectricHoneycombLabeled.png\|thumb]]
	The Electric Honeycomb concept is an intended function of the BGO Pattern signal path to provide information regarding cross-detector scattering to the trigger. It was implemented for better suppression of Compton-scattered events, in which the fast discriminator bits from the 7 BGO segments of each detector (six shields plus back plug), plus the six individual BGO discriminator bits that are face-to-face with the BGO shields, be combined.		The Electric Honeycomb concept is an intended function of the BGO Pattern signal path to provide information regarding cross-detector scattering to the trigger. It was implemented for better suppression of Compton-scattered events, in which the fast discriminator bits from the 7 BGO segments of each detector (six shields plus back plug), plus the six individual BGO discriminator bits that are face-to-face with the BGO shields, be combined.

Amujahid: /* Electric Honeycomb */

2023-02-15T16:01:06Z

Electric Honeycomb

← Older revision		Revision as of 16:01, February 15, 2023
Line 12:		Line 12:

	==Electric Honeycomb==		==Electric Honeycomb==
			The Electric Honeycomb concept is an intended function of the BGO Pattern signal path to provide information regarding cross-detector scattering to the trigger. It was implemented for better suppression of Compton-scattered events, in which the fast discriminator bits from the 7 BGO segments of each detector (six shields plus back plug), plus the six individual BGO discriminator bits that are face-to-face with the BGO shields, be combined.

Amujahid at 15:47, February 15, 2023

2023-02-15T15:47:16Z

← Older revision		Revision as of 15:47, February 15, 2023
Line 9:		Line 9:

	==BGOPattern==		==BGOPattern==
			The BGOPattern channel of the SBX uses two ranks of analog switch plus a set of discriminators to generate a wide variety of signal possibilities.

	==Electric Honeycomb==		==Electric Honeycomb==

Amujahid: /* BGOSum */

2023-02-13T21:34:34Z

BGOSum

← Older revision		Revision as of 21:34, February 13, 2023
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	GeSides are another contact point of the germanium. They entail the germanium around the hole in the center. There are two types of germanium placed in the detector: segmented and non-segmented. Segmented germanium has an insulator in the middle of its cylindrical shape (thus making two sides or halves), while non-segmented germanium is not split by anything. The two types of detectors are not treated very differently, but based on the type of germanium there are varying electronics used to receive data.		GeSides are another contact point of the germanium. They entail the germanium around the hole in the center. There are two types of germanium placed in the detector: segmented and non-segmented. Segmented germanium has an insulator in the middle of its cylindrical shape (thus making two sides or halves), while non-segmented germanium is not split by anything. The two types of detectors are not treated very differently, but based on the type of germanium there are varying electronics used to receive data.
	==BGOSum==		==BGOSum==
			In addition to [[High Purity Germanium (HPGe)\|HPGe]], Gammasphere's detectors use BGO, or bismuth germanium oxide to absorb gamma-rays. The BGO surrounds each Gammasphere detector in a hexagonal shape. The BGO sum signal is the sum of hits to the sides of a detector's BGO.

	==BGOPattern==		==BGOPattern==
	==Electric Honeycomb==		==Electric Honeycomb==