Parity DAQ - Expert INFO

This document is broken down into two separate levels (with subcategories).

• Hardware
  • Counting House Crate
  • Injector Crate
  • Right Spectrometer Crate
  • Left Spectrometer Crate
  • Test Crate
  • Trigger Supervisor Crate
• Software
  • CODA Configurations
  • ASCII Database Creation (createDB)

Quick Link to Hardware Configurations

• During HAPPEX-4He (2005)
• During SRC (and perhaps DVCS)
• During HAPPEX-H (2004)
• During HAPPEX-4He (2004)
• During Pentaquark
• During Hypernuclear Spectroscopy (Hypernuclear)
• During Small Angle GDH (SAGDH)

Counting House Crate

This crate was the work horse of the original HAPPEX experiments performed in Spring 1998 and Spring-Summer of 1999. It is located in the Hall-A Counting House electronics rack (CH01B03). Its main function is the readout of Beam Position Monitors (BPMs) and Beam Current Monitors (BCMs) that are located along the beam path between the Beam Switch Yard (BSY) to the Hall-A Target. Below are links to tables that indicate which devices (BPMs, BCMs, etc.) are readout by which monitorring devices (ADCs, Scalers, etc.).
• During HAPPEX-H
• During HAPPEX-4He
• During Pentaquark
• During Hypernuclear Spectroscopy (Hypernuclear)
• During Small Angle GDH (SAGDH)

Injector Crate

This crate was also used during the original HAPPEX experiments, and was revived just before the Beam Studies performed during the Summer of 2002. It is located in the Injector Service Building (ISB) electronics rack (IN01B03). Its main function is the readout of BPMs and a BCM in the 100keV and 5MeV region of the Injector. Below are links to tables that indicate which devices (BPMs, BCMs, etc.) are readout by which monitorring devices (ADCs, Scalers, etc.).
• During HAPPEX-H
• During HAPPEX-4He
• During Pentaquark
• During Hypernuclear Spectroscopy (Hypernuclear)
• During Small Angle GDH (SAGDH)

Right Spectrometer Crate

This crate is located on the second platform of the Right Spectrometer hut. Its main function is the readout of Photo-Multiplier Tubes (PMTs) from the Luminosity Detector (LUMI) and the Right Spectrometer HAPPEX Detector (DET). Below are links to tables that indicate which devices (LUMIs, DETs, etc.) are readout by which monitorring devices (ADCs, Scalers, etc.).
• During HAPPEX-H
• During HAPPEX-4He
• During Pentaquark
• During Hypernuclear Spectroscopy (Hypernuclear)
• During Small Angle GDH (SAGDH)

Left Spectrometer Crate

This crate is located on the first platform of the Left Spectrometer hut. Its main function is the readout of PMTs from the Left Spectrometer Detectors, Profile Scanner, and Beam Itensity and Position Cavity Monitors.
• During HAPPEX-H
• During HAPPEX-4He
• During Pentaquark

Test Crate

This crate is located on the Second Floor of the Counting House, inside an electronics rack in the Third Arm Electronics Cage. Its main function is to test and characterize ADCs.

Trigger Supervisor Crate

This crate is located in the Counting House electronics rack (CH01B02). Its function is to supply a readout trigger (a copy of the Counting House Crate trigger) to all crates when using a Multi-Crate CODA configuration.
The Trigger Supervisor (TS) is supplied a Level 1 Trigger via the VME Trigger of the Counting House Crate Timing Board. This trigger is then sent out to selected Branches (and ROCs) on the TS. Branches (and ROCs) are selected via the CODA Configuration. Below are links to a table that indicate which branch is connected to which crate.
• During HAPPEX-H
• During HAPPEX-4He
• During Pentaquark
• During Hypernuclear Spectroscopy (Hypernuclear)
• During Small Angle GDH (SAGDH)

CODA Configurations

After first starting up CODA with runcontrol a shift worker will need to click on the "Configure" button. This pops up a window with a variety of CODA Configurations. Each configuration determines which predetermined combination of crates will be used for a run, by talking to the CODA MSQL Database. Below are the configurations currently available along with the crates used in each. ONLY A PARITY EXPERT CAN/SHOULD CHANGE THE DEFINITION OF THESE CONFIGURATIONS IN THE DATABASE.

Config	Counting House	Injector	Right Spectrometer	Left Spectrometer	Test Crate	Uses panFFB	Note
happex2	X	X	X	X		X
happex2_min	X		X	X		X
GDH	X	X	X			X
GDH_Minimal/CountHouse	X					X
BeamLine	X	X				X
Lumi	X		X			X
Injector		X					Current Monitor = bcm6
RightSpect			X
LeftSpect				X
TestCrate					X

ASCII Database Creation

In order to Analyze a run correctly, a database must be constructed that accurately defines the devices used, oversampling factor, helicity mode, etc., etc.. A PERL script (createDB) has been written to serve just this purpose. The basic function of this script is to use the type of CODA configuration to determine specific files to combine together. Below is a description of those files with their location.
KEY:


$config	= CODA Configuration
$oversample	= Total # of Integration Gates per Helicity Window
$crate	= A Specific Crate, defined in a CODA Configuration

In all cases, if a specific file is not found.. a default file will be used.
• db/config/$config.def
Contains the Crates that are included in a given configuration.
• db/cuts/$config_$oversample.cuts
Contains the cut definitions for a given configuration and oversample value. Also contains "curmon" (indicates which devices to use for beam cuts)
• db/dacnoise/$crate.dacnoise
Contains calibrated dacnoise slopes for ADCs for a given crate.
• db/datamap/$crate.datamap
Contains the datamap for a given crate. If the CODA Configuration is a single crate configuration, the TIR and Timing board lines will be replaced with default lines (in order for PAN to retreive important timing and helicity information).
• db/helicity/current.helicity
Helicity information is retreived automatically from EPICS when createDB is run, and saved to this file, at the beginning of each run
• db/misc/$config.misc
Contains so miscellaneous arguments (e.g. anatype, blindstring) for a given configuration.
• db/ped/$crate_$oversample.ped
Contains pedestals for ADCs and Scalers for a given crate and oversample value.
• db/timebrd/timebrd.cfg
Contains information from a timing board (Counting House for Multi-crate configurations): Oversample, Integrate Gate, and Ramp Delay. This file is updated automatically at the beginning of each run.