Difference between revisions of "Fall 2016 optic plans"

Revision as of 10:58, 5 September 2016

Back to [Fall 2016 DVCS run plan]

Assuming we only need one setting for the new Q1.

This proposition has been made on the basis of Winter 2016 run plan, and experience of what happened and what was really used.

Proposition of LHRS run plan (still needs to be integrated with RHRS run plan)

One pass program

E_beam= 2.217 GeV
LHRS θ_e=16.5 deg
LHRS DAQ: S2+Cer (T3), Use LHRNEW for DAQ configuration. See [section 5.2 in DVCS shift howto] for complete procedure!.  
Energy and position lock should be on.
The DVCS calorimeter HVs need to be off

==== Step L1: Procedure with Sieve-slit (DIS) ====
The DVCS calorimeter HVs need to be off
P₀= 1.0 [GeV/c] (DIS)
If the LHRS goes to a new higher momentum setting, Q2 and Q3 need to be cycled.
Simply leave the regulation ON for Q1.
Beam current : 20 μA
NO Raster
Q²= 0.182 GeV²
W= 1.727 GeV

==== Step L2: Delta Scan with Proton Elastic (NO sieve) ====

The DVCS calorimeter HVs need to be off
If the LHRS goes to a higher momentum setting, Q2 and Q3 need to be cycled.
Simply leave the regulation ON for Q1.  
LHRS θ_e=16.5 deg
We are going to need to check the rates before we take these data, to be safe. But from experience from Winter 2016, 20 μA should be ok.
Run duration: 6-8 minutes each (It was enough during Winter 2016 experience) (We want at least 10k electron events).
Raster ON.