Machine Signals

The following shall give an overview of the electronic interfaces at the machine to specific signals, e.g. for data acquisition.

Timing system

scuxl0319

The timing receiver scuxl0319 is located in electronics hutch (TH2.033), at the top of rack EX3. Besides the two B1/B2 channels on the SCU card, it contains two function generator cards type FG 900.740 with 8 digital outputs. The B1/B2 channels can be freely reprogrammed to any White Rabbit event, while the function generator cards contain a pre-defined assignment to specific events.

Channel	type	Function
B1		Programmable through Genesys
B2		Programmable through Genesys
FG1-1	level	(CRYRING_RING:) CMD_BEAM_ON CMD_BEAM_OFF
FG1-2	level	(CRYRING_RING:) CMD_EBEAM_ON CMD_EBEAM_OFF
FG1-3	level	(CRYRING_RING:) CMD_TARGET_ON CMD_TARGET_OFF
FG1-4	level	(CRYRING_RING:) CMD_EXP_DAQ_START CMD_EXP_DAQ_STOP
FG1-5		- not used -
FG1-6		- not used -
FG1-7		- not used -
FG1-8		- not used -
FG2-1	pulse	CMD_TARGET_ON
FG2-2	pulse	CMD_TARGET_OFF
FG2-3	pulse	CMD_EXP_DAQ_START
FG2-4	pulse	CMD_EXP_DAQ_STOP
FG2-5	pulse	CMD_EXP_DRIVE_IN
FG2-6	pulse	CMD_EXP_DRIVE_OUT
FG2-7	pulse	CMD_INJ_KICKER_START
FG2-8	pulse	CMD_EXTR_KICKER_START

Signals types are TTL (+5V) and if specified as level they are Hi for the inter-event duration of the corresponding events listed in the Function column of above table. If the type is specified as pulse the duration is 1 us.

scuxl0006

A second timing receiver is scuxl0006 and is located inside the HV cage of the electron cooler and also running the Genesys class. There are only two channels available, the B1/B2 channels on the SCU card. Their assignment is as follows:

Channel	Level	Function
B1	TTL	Genesys: Hi-Level from CMD_EXP_DAQ_START CMD_EXP_DAQ_STOP
B2	TTL	Genesys: TBA

See also Timing System Event Numbers in the Wiki of the Timing group.

Genesys settings

The channels B1 and B2 can be programmed using the Genesys application. The possible outputs types are 'Single Condition', 'Gate/Pulse' and 'Inter Event'. For the first two options one timing event has to specified, the last one requires two.

Commonly used timing events are listed in the following table with all required parameters. These values are valid for the November/December 2023 beamtime and might change if a different pattern is used.

Timing Event	GID	Event No	Beam-In	BPC-Start	SID	BPID
CMD_BEAM_ON	203	518	true	false	1	2
CMD_BEAM_OFF	203	520	true	false	1	2
CMD_EBEAM_ON	210	522	true	false	1	4
CMD_EBEAM_OFF	210	523	false	false	4	14
CMD_TARGET_ON	210	526	tbd	tbd	tbd	tbd
CMD_TARGET_OFF	210	527	tbd	tbd	tbd	tbd
CMD_EXP_DAQ_START	210	528	true	false	3	11
CMD_EXP_DAQ_STOP	210	529	true	false	4	12
CMD_EXP_DRIVE_IN	tbd	530	tbd	tbd	tbd	tbd
CMD_EXP_DRIVE_OUT	tbd	531	tbd	tbd	tbd	tbd
CMD_INJ_KICKER_START	210	1026	true	false	1	2

Beam diagnostics

A patch panel at the top of rack EX3 in the electronics hutch (TH2.033) is interfacing with signals from the BeamDiagnostics electronics room (connectors: BNC-50Ω) The assignment of the channels is semi-permanent and as follows:

Channel	Signal Direction	Signal type	Description
1	Exp	NIM	Lassie ch: YR00DA1ZA (Particle detector count rate from experiment)
2	Exp	NIM	Lassie ch: YR00DA1ZB
3	Exp	NIM	Lassie ch: YR00DA1ZC (Cooler collector current)
4	Exp	NIM	Lassie ch: YR00DA1ZD (Cooler platform voltage)
5			reserved
6			reserved
7			reserved
8	Exp	NIM	CryogenicCurrentTransformer (CCC)
9	Exp	NIM	horizontal IonizationProfileMonitor MCP count rate (IPM)
10	Exp	NIM	vertical IPM count rate
11	Exp	NIM	ParametricCurrentTransformer
12	Exp	NIM	IntegratingCurrentTransformer integral
13	Exp	NIM	BeamPositionMonitor integral
14	Exp	NIM	Schottky "Span-0"
15	Exp	NIM	CryRadio
16	Exp	NIM	RingRF

Please note that NIM signals use a current-based logic with negative pulse for "true" (at −16 mA into 50 ohms = −0.8 volts) and 0 mA for "false" (see also Nuclear Instrumentation Module.)

-- MichaelLestinsky - 2022-03-26