List of Figures

• Location of Run Safe boxes in Experimental Area
• Location of Run Safe boxes in Hall A (elevation view)
• Location of Run Safe boxes in Hall A (plan view)
• Hall A AC power distribution, Sheet 1
• Hall A AC power distribution, Sheet 2
• Hall A AC power distribution, Sheet 3
• Hall A Utility power panels
• Hall A Clean power distribution
• Hall A Clean power panels
• Hall A AC distribution grounding
• HRS Magnet DC power Schematic
• HRS Bogie Drive and Moter Schematic
• Hall A LCW system - Sheet 1
• Hall A LCW system - Sheet 2
• Hall A LCW system - Sheet 3
• Hall A LCW system - Sheet 4
• Hall A water fire suppression system, sheet 1
• Hall A water fire suppression system, sheet 2
• Hall A water fire suppression system, sheet 3
• Hall A gas fire suppression system
• Hall A BCM System
• Beam current measurement cavity
• Unser current monitor
• Energy loss spectra for electrons at 0.3 GeV and 1 GeV and protons at kinetic energy of 47 MeV (momentum of about 0.3 GeV/c) and kinetic energy of 433 MeV (momentum of about 1 GeV/c) through both the target chamber exit window (assuming 5 mil kapton) and spectrometer entrance window (5 mil kapton) and 2 cm of intervening air
• RMS multiple scattering angle of the electrons and protons as a function of the scattered particle momentum
• Effects of the multiple scattering on the momentum resolution as a function of the momentum
• A side view of the target chamber, solid target mechanism, and pivot post
• Aluminum middle ring of the target chamber
• The stainless steel base ring of the target chamber
• The stainless steel cylindrical top hat of target chamber
• The inverted hat will contain the vertical ladder, solid target cooling tubes, and drive assembly for the ladder
• The target ladder
• The target frame
• The target system
• Schematic view of the whole system
• A cutaway of the waterfall target cell
• Detailed view of the 3-waterfoils geometry
• Cutaway view of the waterfall target container
• Side view of the waterfall target container
• Front view of the waterfall target container
• The Hydraulic system: a schematic view
• Layout of the slow control system
• Signals layout
• The 4 GeV/c High Resolution Spectrometer (elevation)
• The 4 GeV/c High Resolution Spectrometer (plan)
• HRS Electron Arm Detector System
• HRS Hadron Arm Detector System
• HRS Vacuum System
• Basic layout of NMR system
• Gradient Compensating Circuit
• Control Voltage calibration for type 3 NMR probes
• Gradient Compensating Circuit
• Control Voltage calibration for type 4 NMR probes
• Control Voltage calibration for type 5 NMR probes
• DAC Calibration for manual operation of NMR probes
• Hall-A hadron spectrometer positioning control screen.
• Schematic layout of the collimator box
• Sieve slit collimator for optics calibration
• Relative VDC geometry.
• Gas flow schematic.
• Overview.
• The 2" PMT base used in S1 and S2 trigger scintillators
• The 2" PMT base dynode resistor chain
• The 5" PMT base used in S3 trigger scintillators
• The 5" PMT base dynode resistor chain
•  Shematic description of the gas flow.
•  The gas rack for the gas distribution in the electron and/or the hadron Cerenkov counters.
•  The gas rack for gas flow tunning and the control of the inside pressure in the Cerenkov counter.
•  The volume deformation, due to the inside pressure, was measured through the measurement of the``arrows'' of each entrance
•  Volume variation for the hadron Cerenkov counter in function of the pressure.
•   Each parts, windows raising and main box are fixed together with hermitic joins.
•   Typical curve of reflectivity of the mirrors.
•   Quantum efficiency of the photocathode as a function of the
•   Typical ADC spectrum. The single peak is clearly separated form the noise and the peak for 2 is also seen.
•   Numerotation for the PMT of the Cerenkov counter of the electron arm.
•   Numerotation for the PMT of the Cerenkov counter of the hadron arm.
•   PMT noise as a function of the HV. This was obtained with a low threshold of discrimination ( 60 mV)
•   Relative gain in arbitrary units for all the PMTs at three different High Voltage 1800,2000 and 2200 Volts.
• Schematic diagram of the aerogel Cerenkov counter as viewed by the incoming particles. The numbers indicate the sections, 1 to 13, in the counter. Each section is viewed by two PMTs, one on the top (T) and one in the bottom (B). The labeling carries no significance other than identifying the PMTs during the testing phase, as described in the text.
• Cross sectional drawing of the counter, along the particle direction, showing the planar parabolic nature of the mirrors and the geometry of the PMTs, as well as the final dimensions. The joint of the two mirror surfaces in the middle of the counter defines the mirror ``ridge''.
• Photograph showing the final arrangement of the double sidewall structure, and the close spacing of the housings for the PMTs. The bottom section of the counter, with the tray and the aluminized mylar reflector lining, is also shown. In this picture, the particles would be incident from the bottom toward the top of the counter. The upper (mirror) section has been removed for clarity.
• Photograph showing the middle (PMT) section with the double sidewall structures and the housings for the PMTs, with the top (mirror) section attached. The tray has been removed, and the white tabs on the mirrors are pieces of tape holding a temporary protective film in place to prevent damage to the mirror surfaces during transportation. In this figure, the particles would be incident from the top toward the bottom of the picture.
• Typical reflectivity curve of a mirror as a function of the wavelength, , of the incident light.
• A photograph showing the upper (mirror) section with the planar parabolic mirrors. The mirror surface is protected by a vinyl film in this picture. The mirror ``ridge'' separating the counter into two halves is clearly seen. This section fits over the open top of the counter in Fig.
• Schematic diagram of the electronic amplification chain. The total resistance of 600 between the cathode and the first dynode is shown as three 200 resistors for sake of clarity. In the actual PC boards, the arrangement is of six resistors of 100 each, in order to keep the voltage across each resistor low and avoid surface discharge between the closely packed resistors.
• Relative geometry of total absorber part of shower counter.
• Circuit diagram for the high voltage / termination board.
• Circuit diagram for the readout / transmitter board.
• Circuit diagram for the level shifter / receiver board.
• Gas Shed Schematic Diagram
• Block Diagram of Mass Flow Control System.
• Vapor Pressures of Isopropyl and Ethyl Alcohols calculated using the CRC Handbook parameterization.
• Gas Distribution inside Hall-A
• Overview of the logic of the trigger.
• Overview of electron-arm singles trigger.
• Overview of coincidence trigger.
• The main window of XTrigMang
• The Verify All window list modules whose setting in the crate are not the same as the settings in the data-base. In this case two modules were unplugged, one module was in the wrong slot and one module was broken.
• The Electron_Arm window list all the modules in the Electron Arm part of the trigger. The arrangement of the buttons indicates the flow of information. For example s12e_l_disc is the input for s12e_l_delay. s12e_l_delay and s12e_r_delay are the inputs for s12e_logic.
• The Discriminator window
• The Delay Window
• The Logic Window
• The MLU window
• Information windows Read Map of which module is assigned to which slot in the crate
•  Information window Read Settings in the Data-Base.