CaFe Preparation

CaFe Preparation Overview

The CaFe experiment is set to run in Hall C in August 2022. This wiki will be used to document our weekly meetings, as well as post any other useful information such as proposals, previous publications, other useful links, etc. prior to the experiment running.

CaFe Task Force Contact

Name	e-mail
Dien Nguyen	dien@jlab.org
Holly Szumila-Vance	hszumila@jlab.org
Larry Weinstein	lweinste@odu.edu
Carlos Yero	cyero@jlab.org

Pre-Run Task List

• CaFe Pre-Run Task List (google sheets)

*Targets currently on ladder: Hall C Target Ladder

• Planned targets:
  • D, H, dummy, optics
  • Physics: 40Ca, 48Ca, 54Fe
  • Next preference: 9Be, 10B, 11B, 12C
  • If time: 48Ti
• Planned Target Ladder for 2022-2023

Planned Targets for Run Period: 2022-2023 (D. Meekins, google spreadsheet)

Planned Targets for Run Period: 2022-2023 (D. Meekins, google spreadsheet) version 2

Weekly Meeting Information

Weekly Meetings are Tuesdays at 09:30 am (remote only)

• Zoom remote connection information: https://jlab-org.zoomgov.com/j/1619420740?pwd=ZEZIVWNpYVpLdVFwWWRLcDBSY1pOQT09

Please add your presentation/updates or questions before each meeting under the appropriate (month, year) below

November 2021

• Monday, November 08 , 2021
• Monday, November 15 , 2021
• Monday, November 22, 2021
• Monday, November 29, 2021

December 2021

• Monday, December 06, 2021

January 2022

• Monday, January 17, 2022
• Monday, January 24, 2022

CaFe Kinematics Optimization

• CaFe Optimization (Phase 0)
• CaFe Optimization (Phase 1)
• CaFe optimization (update round 3)
• CaFe 3-Page Kinematics Optimization Summary
• CaFe Checkout/Calibrations and H(e,e'p) Elastics Rates Estimates
• CaFe SHMS Scintillator Paddles Acceptance Study
• Cafe different run plans for different Iron target thickness, max beam current
• Sieve rates for SHMS
  • Single arm C-foil at 30 uA for 11 minutes, P=8.7 GeV, theta=8.9deg
• Heep0 singles, Heep1 singles, Heep2 singles
  • H singles at 55uA for 15 minutes, P=8.7GeV, theta=9.9deg
  • Sim for run 3373 kinematics

CaFe Radiation Budget

• CaFe Radiation Budget

CaFe GEANT4 Simulation

• Geant4 Simulation of Ca48

CaFe SHMS NGC Gas Mixture

SHMS will detect e- momenta up to ~10.3 GeV/c, therefore if we want to use SHMS NGC for pion rejection, it will require ~ 90:10 Ne:Ar gas mixture for said momentum. The NGC gas mixture used so far has been: 60:40 Ne:Ar: https://logbooks.jlab.org/entry/3895288 , https://logbooks.jlab.org/entry/3938535

Documents related to the specific PMT type as well as photo-electron yields of the NGC can be found in the links below:

• Hall C Cherenkovs ERR 2016
• SHMS PMT ET9823 B Series
• SHMS NGC Preliminary Report

CaFe Trigger Set-Up

The CaFe experiment will detect electrons in SHMS and protons in HMS. The SHMS will be stationed at 8.55 GeV/c and range from ~6.8 deg to 8.3 deg, therefore the electron singles rates are expected to be significant. To minimize singles rates, it was decided to turn off half of the SHMS S1X and S2X hodoscope planes. To select a clean sample of electrons in SHMS, it was decided to 1) use SHMS EL-REAL trigger and 2) set the SHMS Noble Gas Cherenkov pion threshold to ~10.3 GeV/c (pion emits Cherenkov light at >= 10.3 GeV/c). During online data-taking we'll need to check how efficient is the Cherenkov at this configuration (~90% Neon, ~10% Argon). The latest trigger configuration from the previous run-group can be found in log-entry: https://logbooks.jlab.org/entry/3892668

Tentative CaFe Trigger Configuration:
SHMS: EL-REAL (electron reals)
HMS: 3/4 Hodoscope Planes
COIN: SHMS EL-REAL x HMS 3/4

For trigger definitions, See Trigger Documentation: https://hallcweb.jlab.org/DocDB/0010/001028/005/trigger_v3.pdf

CaFe presentations

• Hall C collaboration Meeting Feb 18-19, 2022

CaFe To-Do List

• CaFe Pre-Run Task List (google sheets)

Proposals

• CaFe Proposal (PAC 44)
• CaFe Proposal (PAC 45)