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BaBar Prototype II Drift Chamber

Current Configuration

Last modified: 30 September 2002, M. Kelsey


The Prototype II drift chamber (Proto II) is a full-scale mockup of the BaBar Drift Chamber, covering a narrow angular region (1/8, 45°) of the first four superlayers.

This document describes the current software and hardware configuration, including database configuration keys, software release, etc. This information is useful for running Proto II for data-taking and calibrations. Upgrades to this configuration can be done following the software setup instructions, and should be documented here.

In April 2002, a new test-stand, covering two full wedges of front-end electornics has been build onto the support frame of Prototype II. This setup is projected to be linked with a spare Master Crate to the trigger group's test stand for joint DCH-DCT testing and troubleshooting. This new test stand has a separate DataFlow area (platform 27) and a separate test release area.

Proto II Test Release

The operations area for Proto II is $BFROOT/detector/dch/DchProto2/, and is based on Online Release 7.0.16. It has the following additional packages checked out

	DchCalOdf V00-05-03
	DchCalOnline V00-02-21
	DchCalScripts V00-01-14
	DchOdf V00-05-02-02
	DchOepApps V00-02-09
	DchOnline V00-08-04
	DchTestStand V00-04-02

Every time you log on, you must configure your environment for Proto II operations. From the above directory, execute

	source DchTestStand/setup.csh

DCH/Trigger Test Release

The operations area for the combined test stand is $BFROOT/detector/dch/DchTrigger/, and is based on Online Release 7.0.16. It has the following additional packages checked out

	DchCalOdf V00-06-01
	DchCalOnline V00-02-22
	DchCalScripts MHK-20020927 (V00-02-02)
	DchConfigData V00-00-07
	DchMaps V00-02-00
	DchOdf V00-05-05
	DchOepApps V00-02-11
	DchOnline V00-08-04
	DchProxy V00-02-11-08 (* plus uncommittable changes)
	DchTestStand V00-04-09

Every time you log on, you must configure your environment for operations. From the above directory, execute

	source DchTestStand/setup.csh

Current DAQ Setup

As described in the hardware documentation, both the ROM and DIOM must be set up to self-identify as the same "quadrant," as though they were installed on the real chamber. Currently, we are reading out Prototype II as Quadrant 1, wedges 4 and 5.

Current Configuration Keys

Following the setup instructions, several configuration keys have been made for calibrations and for data-taking. The current keys, for use with the chamber in Quadrant 1, are

New -- these keys prescale the 60 MHz clock
0x4a3
(1187)
Calibration-ProtoII-Q1-sync.dat
0x4a2
(1186)
Calibration-ProtoII-Q1-sync-debug.dat

0x43e
(1086)
DataTaking-ProtoII-Q1.dat
0x43f
(1087)
DataTaking-ProtoII-Q1-allchan.dat
0x4a1
(1185)
DataTaking-ProtoII-Q1-all+wf.dat
Attaches raw waveforms to every channel of output
0x4ac
(1196)
DataTaking-ProtoII-Q1-all+wfx2.dat
Attaches raw waveforms on every other event (maybe???)
0x4ab
(1195)
DataTaking-ProtoII-Q1-all+wf-mask-2.dat
Like 0x4a1, but with elefant disable mask 0x55 on FEEs 0-1
0x50e
(1294)
DataTaking-ProtoII-Q1-allchan-rou12-13-15.dat
Like 0x43f, but with ROUs 8,9,12,13 enabled.

Test keys for new DCH/trigger (DCT) test stand
0x524
(1316)
DataTaking-P2Dct-Q1-allchan-2.dat
Like 0x43f, but with ROUs 8,9,10,11,12,13,14,15 enabled.
0x533
(1331)
DataTaking-P2Dct-Q1-allchan-debug.dat
Like 0x533, but with ROUs 0-7 in quadrant 1 enabled.

New configuration keys made for the DCH-DCT test stand as Quadrant 0.

0x5f2
(1522)
DataTaking-DchDct-Q0-w0+1.dat
Like 0x43e, but for DCH/trigger test stand, Quadrant 0, wedges 0 and 1. Debug enabled.
0x5f4
(1524)
Cal-P2-DCT-Q0w1+2-debug.dat
Like 0x4a2, but for DCH/trigger test stand, Quadrant 0, wedges 0 and 1. Debug enabled
0x609
(1545)
DataTaking-DchDct-Q0-w0+1-allchan.dat
Like 0x5f2, but in all-channel mode.
0x61D
(1565)
Calib-DchDct_Q0-w0+1-hiDAC.dat
Combined DCH/Trigger calibration, with track-patterns.

Obsolete -- these keys use the external LeCroy DDG
0x43d
(1085)
Calibration-ProtoII-Q1.dat
0x43a
(1082)
Calibration-ProtoII-Q1-debug.dat

0x46a
(1130)
ProtoII-calib-8pulse-160.dat
Testing high-rate initial "trigger pulse"; c.f. IR-2 key 0x467
0x46b
(1131)
ProtoII-calib-allchan-100.dat
Testing all-channel initial "trigger pulse"; c.f. IR-2 key 0x468

0x440
(1088)
Scratch Key, for use by experts only

Electronic Calibration

The Proto II "test bench" calibration data, used for validation, is labBoxSetup/pro010810.cal, and covers FEA's #117 and #103 in all four possible quadrants.

There has not yet been a validated calibration of Proto II. A "test" validation, pro0, was extracted from DCH calibration cal1735, but obviously is based on different FEAs.

Scintillator Trigger Settings

The Prototype II trigger consists of a three-fold coincidence of scintillator paddles, one above the chamber, one immediately below, and one below a 62 cm steel range stack. The PMT voltages, discriminator thresholds and widths are set to

Voltage Threshold
(mV)
Width
(ns)
T1 1900 40 24
T2 2000 40 52
T3 2050 40 72

High Voltage Settings

Proto II should be run with the same wire voltages as the real drift chamber, 1930V on the sense wires, 335V on the guard wires, and 870V on the zipper wires.

These voltages must be set while manually ramping up the Bertan power supplies, as described in the Data Taking.