TWIST Hardware Documentation

Dealing with Hardware Trouble

Magnet Safety

Film Degrader

• List of film degrader thicknesses.

Laser Alignment System

• Images captured by alignment cameras

GAS System

• Directory
• "Time constant" of the gas degrader (time it takes to change settings).

Magnet

• See also the several TWIST Technotes and TWIST Student Reports on Magnet Mapping.

• Slides from a talk on mapping the magnetic field: D. Evans, M. Barnes, D. Morris, and G. Marshall, Proc. 13th International Magnet Measurement Workshop, Palo Alto, CA, May, 2003. (Includes map data from both 2002 (tracking region) and 2003 (upstream region).

• Annotated history plots from the cooldown and ramp:
  • Solenoid shield temperatures, long scale
  • Solenoid shield temperatures, short scale
  • Coil resistors, indicative of coil temperature
• Notes on the LN2 level sensor
• "Safe" levels of LN2 and LHe in the magnet.

FASTBUS

• Fasttbus interlock system and Air Conditioning after a power failure
• Nominal voltage and current readouts for FB crate power supplies.
• 1877 Lecroy Fastbus TDC
• 1877s Lecroy Fastbus TDC
• 4100 SIS Fastbus master (pseudo SFI)
• Corrected page 9
• VME interrupt fix for modules produced before Aug 1999

PAD - Postamp discriminator

•   Front panel
•   Schematics: Overall  ;  Ch 1 & 2
•   Schematics: threshold and test pulse voltage control  ; voltage and temperature monitor

PA_CTRL 0945 - Postamp Control Module

•  User's manual , Addendum - PACT
•   Front panel
•   Schematics: Sheet 1  ; Sheet 2  ; Sheet 3

PACT 0948 - Postamp Charge to Time Converter

• Description of module by J. Schaapman
• MQT300a chip operation as described in Lecroy catalog 1997
• Front Panel diagram
• Schematics: channels 1 and 2 ; power distribution
• Schematics: test pulse, gate and range ; voltage and temperature monitor

Scintillators

• Scintillator setup with Mtec scintillator in place. (19 Oct 2004)
• See also High Voltage section, below.

DVM

• Agilent 34970A Data Acquistion/Switch Unit User Manual

High Voltage

• Scintillators: High Voltage cabling and settings (cumulative list of settings and changes)
  • Summary of HV Cabling and Settings for scintillators, as of 19 October 2004, with Mtec in use.
• Chamber HV system: Description;
• HV PS control breakout schematic
• HV PS control breakout  box
• HV PS control CAMAC  crate
• Mods to Vern Kiebler power supplies
• Nominal Detector Settings including High Voltage settings.

CABLING maps

• Chamber Cabling Map :
• Z/X view(2002)     Z/X view(2001)
• X/Y view(2002)     X/Y view(2001)
• PAD Cabling: Maps
• Fastbus Cabling: FBC1, FBC2
• CAMAC cabling: scalers
• Scintillators: High Voltage cabling and settings

Event Trigger

• Overview
• Logic diagram (jpeg, 184 kB)
• Some instructions on changing the event trigger

M13

Stopping Target

• Aluminum target foil thickness measurements [broken .ps file] -- thickness is 71um+-1um.
• Aluminum target module construction, including thicknesses of mylar, kapton, and aluminum used.

Chamber Geometry

• Cathode foil thickness
• Corrections to Module Positions relative to nominal, due to actual cital thicknesses.

Miscellaneous

• Preamp 4v supply: schematic, front panel layout