Vertical Drift Chambers for the Hall A High Resolution Spectrometer of Jefferson Lab
The High Resolution Spectrometers in Hall A at Jefferson Laboratory have been instrumented with state-of-the-art Vertical Drift Chambers designed and constructed by the Nuclear Interactions Group at MITLNS in conjunction with the Physics Division at Jefferson Lab. These chambers rely on a unique, high cell-density design made possible by the absence of field-shaping wires. Each chamber has an inert per-plane resolution for 5-cell cosmic ray track of 145 mu-m FWHM when operated on the bench at -4.8 kV with argon-isobutane gas, and 225 mu-m FWHM for 5-cell electron tracks when operated in the High Resolution Spectrometer detector stack at -4.0 kV with argon-ethane gas. The design and construction facilities wire placement and replacement to 50 mu-m, very low dark current, and no crosswalk. The detectors have been in almost continuous use since April 1996, providing reliable, high-resolution charged-particles tracking data for the hall A physics program.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 796073
- Report Number(s):
- JLAB-PHY-00-29; DOE/ER/40150-2101; TRN: US0201430
- Journal Information:
- Nuclear Instruments and Methods in Physics Research Section A, Vol. 474, Issue 2; Other Information: PBD: 1 Dec 2001
- Country of Publication:
- United States
- Language:
- English
Similar Records
Comparison of Two Wire Chamber Track Reconstruction Algorithms Used in Hall A at Jefferson Lab
Performance and Commissioning of the BigBite Timing Hodoscope for Nucleon Form Factor Measurements at Jefferson Lab