KPP Run Plan

12 GeV Hall C Key Performance Parameter Run Plan (Draft)

The primary goal of this runplan is to satisfy the 5 'KPP' items listed below.

Where practical, these goals will be accomplished as immediate side effects of broader commissioning studies.

KPP Demonstration Items

1. Detector running for 8 hours recording data from all subsystems.
2. Screenshots of beam status and/or accelerator e-log entries demonstrating electron beam current and energy.
3. Data showing relative timing of trigger, tracking, and particle identification in detector sybsystems.
4. Firgures demonstrating charged-particle tyracks from position-sensitive detectors.
5. Particle identification plots using segnals from calorimetry and Cerenkov detectors.

Initial Beam Settings

 Beam Energy:            > 6 GeV/c
 Current requirements:   5--10 uA CW
 Polarization:           N/A

 - We will NOT steer through Compton chicane

Initial Spectrometer Settings

SHMS

   Angle:   15         (>  7.5 degrees[*] -- Beamline Config-2)
   Mom:     6 GeV/c    (nominal, not really important; lower = more rate)

HMS

   Angle:   *TBD* (> 10.5 degrees -- Beamline Config-2)
   Mom:     *TBD*

Notes

 Downstream Beamline:  "Config-2"
   - Config-2 Minimum spectrometer angles are:
     SHMS = 7.5 deg [*], HMS = 10.5 deg

     [*] Moving SHMS below 10 degrees requires special attention to
         potential SHMS fringe field beam steering.

Initial Beam Steer-up

 Goals: 
   NOTE:  NOTE MCC driven procedure 
   * KPP_Run_Plan#KPP_Demonstration_Items KPP 2 Establish beam to Dump with SHMS magnets at production settings.

 - Beam Current:   Viewer limited (Tune Beam)
 - Target:         Empty
 - Raster:         OFF

 Procedure Excerpts (NOTE: See ATLis 16570 (Jay Benesch) for details)
 - SHMS magnets:   OFF
   - Eliminate any question of beam steering due to SHMS fringe field during
     initial steer-up
 - MCC will follow their procedure to establish beam to the Hall C dump
 - Hall C will log snapshots of
   - Beam energy, Beam current, and viewer images (if available) to satisfy
     KPP 1, 2
 - With Tune Beam ON, and spot visible on dump viewer:
   - Slowly bring up SHMS magnets to operating momentum settings.
   - Monitor spot image on dump viewer for unacceptable beam steering due to
     SHMS fringe fields.
   - Snapshot dump viewer images (if available) and SHMS magnet screens with
     SHMS magnets at operating currents when ramp complete.

Basic Beamline, Raster, Instrumentation checkout

Initial Raster checks

 Goals: 
   - Establish beam to be roughly centered in beam pipe by locating it on YAG
     viewer just upstream of target.
   - Turn on Raster and verify beam profile expands as expected.

 - Beam Current:   Viewer limited (Tune Beam)
 - Target:         Empty, or solid target 
 - Raster:         Off; 2mm x 2mm

 Procedure:
 - Insert YAG viewer on Hall C superharp girder
   - start with raster off, verify beam spot roughly centered
   - request raster on:  2mm x 2mm
     - watch beam spot on viewer and verify Raster's basic functionality
 - Retract viewer

Harp scans

 Goals:
   - Verify operation of Harp scanners w/ beam.
   - Establish acceptable beam profile (nominal 100--400um sigma)

 - Beam Current:   5 uA CW
 - Target:         Empty, or solid target 
 - Raster:         Off

 Procedure:
 - Take Harp swipes for all viewers on Hall C beamline
   - verify beam profile (nominal 100--400um sigma) on at least one scanner
     on Hall C upstream beamline

Target/Beam centering, Raster calibration

 Goals:
   - Establish beam position on target.
   * [KPP 3, 4, 5] Start taking data in S/HMS, offline analysis team will
     start analyzing data and can begin looking for tracks, initial detector
     checkout.

 - Beam Current:   5--10 uA CW
 - Target:         BeO, Carbon Hole

 Procedure:
 - Note:  DAQs are running and a solid target is in place
   - Online shift crew will proceed with program below.
   - Offline shift crew will focus on demonstrating KPP 3, 4, 5
     using these solid target data.

 - Attempt to view beam on BeO
     - Target:    BeO
     - Current:   5 uA CW
     - Raster:    OFF
   - Target camera: ON
   - Target lamp:   OFF
   - Log camera snapshot of beam spot on BeO

 - Image Carbon Hole target using Raster current pickoffs vs. raw trigger
   rates in SHMS and/or HMS
     - (NOTE: This does NOT require working spectrometer Optics.)
     - Target:    Carbon Hole
     - Current:   5 uA CW
     - Raster:    3mm x 3mm
   - Run DAQ on SHMS / HMS
     - Set prescales to ensure DAQ rate is dominated by scintillator triggers
   - Run Spot++
     - View the Raster *Current* X vs Y plots (not BPM plots)
     - Locate the hole in the 2D intensity histogram
       Example of imaged hole:  https://logbooks.jlab.org/entry/3427728
   - Center Beam on Target:
     - Iterate until beam centered in raster pattern
       - Adjust beam position
       - Run Spot++ to view effect
   - Calibrate raster dimensions against (known) Carbon Hole diameter by
     adjusting Raster magnet settings until raster is just covering the
     carbon hole in the image.

Begin Detector Checkout and Spectrometer Optics Programs

 Goals:
   - [KPP 3, 4, 5] Data taking in SHMS/HMS continues
     - Analysis team will continue debugging until KPP 3, 4, 5 can be
       satisfied (if not completed already)
   - [KPP 1] This program will likely run long enough to satisfy KPP 1

 Procedure:
   Reference: Optics & Detector Working Group (Rolf Ent, Tanya Horn)
 * Note:  DAQs are running and a solid target is in place
   - Online shift crew will proceed with the optics program
   - Offline shift crew will focus on demonstrating KPP 3, 4, 5
     using these solid target data (if not established already).
   - If not established already, the 8 hour clock on running DAQs for
     KPP 1 will be satisfied during this program.