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.
<iframe width="900" height="800" frameborder="0" scrolling="no" src="//plotly.com/~cyero/4.embed"></iframe>
| Name | |
|---|---|
| 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
*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
January 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 SHMS Scintillator Paddles Acceptance Study (part2)
- CaFe SHMS Scintillator Paddles Acceptance Study (part3, finally some good news)
- Cafe different run plans for different Iron target thickness, max beam current
- Cafe run plan using the most updated target information 3% RL Fe and 80uA
CaFe Radiation Budget
CaFe GEANT4 Simulation
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:
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 The 3rd bullet point from the log-entry is IMPORTANT, since it suggests the pEL_REAL x h3/4 cable was terminated and left dangling in case we need it again, which we will during CaFe.
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 Trigger Checkout:
Hardware changes that need to be made during CaFe trigger checkout:
