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Overview

E12-011-112 (x>1) at Hall A is proposed to precisely measure the isospin dependence of two-nucleon short range correlations using mirror nuclei 3H and 3He. More details can be found in the PAC38 Proposal and Patricia's web page.

Trigger configuration

All run were taken at single arm mode ( inclusive e' ).

LHRS (run number <20000):

T1:  S0 && S2
T2: (S0 && S2) && Cer
T3: (S0 || S2) && Cer

RHRS (run number >90000):

T4:  S0 && S2
T5: (S0 && S2) && Cer
T6: (S0 || S2) && Cer

Run Periods

Fall 2018

Beam energy: 5 pass for optics, 2 pass for production.
Run Plan
Statistics Summary
~~Target report 2018~~
Revised Target report, Dec 2020
scattering chamber drawing
Surveys:

Date	LHRS	RHRS
09.18.2018	17 degree	24 degree
10.30.2018		28 degree

Issues:

BCM new receiver gain changed during optics run
wierd BPM Y signal ( seems a noise pickup from beamline, went away by itself [1] [2] )
PS 25 and SH39 not connected until sept 30
LQ2 cycle at 1600 A which is lower than the default setting for 3.82 and 3.93 GeV. Since this was how we set up magnets during optics run, live with it.
LHRS L1A signal is noisy but Trigger rate and ADC gate rate is good (https://logbooks.jlab.org/entry/3602167), fixed during the Oct 9 hall access
run 3581, 3582 have wrong Q1 current ( 882.8A instead of 875 A)
suspicious hotspot on raster pattern during the L17-SRC1 runs ( hitting the collimator?)
RHRS shower gate adjusted on Oct 09, need a new calibration
Run 3912-3919 LQ1 regulator on
Raster1 has been off since Oct 14.
Oct 14 - Oct 20: beam dump vacuum leak, target 15k valve leak, etc...
Oct 21-23: LQ3 tripped several times. RD quench.
Starting from run 94026 on RHRS after RD revived, saw noise when T6 turned on. Kept T6 off till the end. This will affect R28-LS, R28-HS, and the inelastic data we took in the last day. ( starting from run 93822 - right after move to 28 degree, s2 trigger eff dropped to ~95%. DR.tS2coinc spectrum different from before).
small hydrogen contamination in the new Tritium cell.

Spring 2018

target report
2nd pass beam
Spring run plan and summary spreadsheet

Calibrations

LHRS sieve runs with 10.6 GeV beam run summary
Harp Scan logbook

December 2017

Beam Energy: 1 pass (2.216 GeV)
Targets: 3H, 3He, 2H, 1H
Run plan: spreadsheet

Calibration Runs

BPM
BCM
Optics

Run number	Description
757, 758	LHRS BPM pedestal runs
90357, 90358	RHRS BPM pedestal runs
805 - 810	LHRS harp scan
90595- 90600	RHRS harp scan
814 - 819	LHRS BCM calibration
90604- 90608	RHRS BCM calibration

Production Runs

Run number	Angle (degree)	Momentum (GeV)
809 - 924	17	2.0
932 - 949	22	1.805

Useful Information

Meetings

weekly analysis meeting

Wiki-page for E12-11-112

Contents