Winter 2016 optic plans

Back to [Winter2016 DVCS run plan]

If you have questions call Julie Roche, Number is on white board

Integration with RHRS plan

LHRS step	RHRS step	Approximate beam time	Goals
L1 (sieve)	R1 (sieve)	14h	20 uA DIS with sieve slit on optics foils, single carbon and LH2
L2 (sieve)		3h	Delta Elastic on LH2, 1 uA
L3 (no sieve)		3h	Elastic on carbon (Needs A. Camsonne as sieve operator)
L1 (sieve)	R1 (sieve)	8h	20 uA DIS with sieve slit on 4 cm dummy (Needs A. Camsonne as sieve operator)
	R2 (no sieve)	3h	Delta Elastic on LH2, 20 uA
	R3 (no sieve)	1h	Elastic dummy
	R4 (no sieve)	1h	DIS on dummy and optics
L4 (sieve)	R5 (no sieve)	1h	Tungsten wire (Needs D. Mekins as wire operator) (Needs A. Camsonne as sieve operator)

See Right HRS Optics Run Plan

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One pass program

E_beam= 2.301 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) ====
This part of the program is to be run in parallel with the RHRS run plan with sieve slit (Step R1)
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.
Q²= 0.19 GeV²
W=1.77 GeV

	LEFT Q1 Current	Q1	Estimated Rates	estimated time	actual rates	run number	#event in the run
Target	[A]	detune	[Hz] at 20 uA		[Hz] at 20 uA
Optics no raster	752.0	1.000	300	1h (or at least 100k events)
Optics	643.7	0.856	300	1h (or at least 100k events)
Optics	559.5	0.744	300	1h (or at least 100k events)
Optics	470.0	0.625	300	1h (or at least 100k events)
4 cm Dummy 1 by 1 raster	752.0	1.000	160	45min (or at least 45k events)
4 cm Dummy	643.7	0.856	160	45min (or at least 45k events)
4 cm Dummy	559.5	0.744	160	45min (or at least 45k events)
4 cm Dummy	470.0	0.625	160	45min (or at least 45k events)
C single foils no raster	752.0	1.000	60	20 min (or at least 72k)
C single foils	643.7	0.856	60	20 min (or at least 72k)
C single foils	559.5	0.744	60	20 min (or at least 72k)
C single foils	470.0	0.625	60	20 min (or at least 72k)
15 cm LH2 2 by 2 raster	752.0	1.000	780	20 min (or at least 72k)
15 cm LH2	643.7	0.856	780	20 min (or at least 72k)
15 cm LH2	559.5	0.744	780	20 min (or at least 72k)
15 cm LH2	470.0	0.625	780	20 min (or at least 72k)

==== Step L2: Delta Scan with Proton Elastic (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.  

LHRS θ_e=16.5 deg
Rate: 13.3 kHz at 20 μA (taking into account the sieve). Electron rates only.
We are going to need to take these data at about 1 μA.
Run duration about 10 minutes each (we want at least 10k events).

Target: 15cm LH2
k' [GeV]	LQ1 Current [A]	Q1 detune	Delta P [%]	run number	number of trigger
2.184	1642.4	1	1.04
2.184	1405.9	0.856	1.04
2.184	1221.9	0.744	1.04
2.184	1026.5	0.625	1.04
2.142	1610.8	1	1.02
2.142	1378.8	0.856	1.02
2.142	1198.4	0.744	1.02
2.142	1006.7	0.625	1.02
2.100	1579.2	1	1.00
2.100	1351.8	0.856	1.00
2.100	1174.9	0.744	1.00
2.100	987.0	0.625	1.00
2.058	1547.6	1	0.98
2.058	1324.8	0.856	0.98
2.058	1151.4	0.744	0.98
2.058	967.3	0.625	0.98
2.016	1516.0	1	0.96
2.016	1297.7	0.856	0.96
2.016	1127.9	0.744	0.96
2.016	947.5	0.625	0.96

 

==== Step L3: Carbon elastic ( no sieve) ====
A. Camsonne needs to be called to remove the sieve at the beginning to the program.

 
The DVCS calorimeter HVs need to be off
If the LHRS goes to a higher momentum setting, Q2 and Q3 need to be cycled.  
P₀= 2.281 [GeV/c] (super-elastic)
Estimated rate: 0.7 Hz at 20 μ Single Carbon foil or Optics target.
No raster 3 hours.

==== Step L4: Tungsten wire ====
This part of the program is to be run in parallel with the RHRS run plan (Step R5)

The DVCS calorimeter HVs need to be off

If the LHRS goes to a new higher momentum setting, Q2 and Q3 need to be cycled.  

k' [GeV]	LQ1 Current [A]	Q1 detune	Delta P [%]	run number	number of trigger
Target: Carbon single foil
1	752	1.00	n/A (DIS)
Tungsten wire
1	752	1.00	n/A (DIS)

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Two passes program

E_beam= 4.557 GeV, negative polarity
LHRS θ_e=38.04 deg
 
LHRS DAQ: S2+Cer (T3), Use LHRNEW for DAQ configuration. See [section 5.2 in DVCS shift howto] for complete procedure!.

• Optics target
  When going up in momentum, Q2 and Q3 need to be cycled, Q1 doesn't need to be cycled.
  Set p0=1 GeV. Q2, Q3 and the dipole need to be momentum regulated. Take Q1 off the regulation.
  5 optics foils target.
  5 u A unrastered (if the rates are too high use rescales or decrease the current). Take 100 k events at :
  • Q1= 1672.4 A (tuned)
  • Q1= 1605.5 A (96%)
  • Q1= 1455.0 A (87%)
  • Q1= 1254.3 A (75%)
  • Q1= 1087.1 A (65%)
• Delta Scan
  When going up in momentum, Q2 and Q3 need to be cycled, Q1 doesn't need to be cycled.
  Set p0=2.224 GeV. Q2, Q3 and the dipole need to be momentum regulated. Take Q1 off the regulation.
  20 uA rastered.
  I expect about 100 Hz at 20 uA.

  delta	p0 [GeV]	Q1 detune	Q1 current (A)
  1.04	2.313	1	1739.3
  1.04	2.313	0.96	1669.8
  1.04	2.313	0.87	1513.2
  1.04	2.313	0.75	1304.5
  1.04	2.313	0.67	1165.4
  1.02	2.268	1	1705.9
  1.02	2.268	0.96	1637.7
  1.02	2.268	0.87	1484.1
  1.02	2.268	0.75	1279.4
  1.02	2.268	0.67	1143.0
  1	2.224	1	1672.4
  1	2.224	0.96	1605.6
  1	2.224	0.87	1455.0
  1	2.224	0.75	1254.3
  1	2.224	0.67	1120.5
  0.98	2.180	1	1639.0
  0.98	2.180	0.96	1573.4
  0.98	2.180	0.87	1425.9
  0.98	2.180	0.75	1229.2
  0.98	2.180	0.67	1098.1
  0.96	2.135	1	1605.6
  0.96	2.135	0.96	1541.3
  0.96	2.135	0.87	1396.8
  0.96	2.135	0.75	1204.2
  0.96	2.135	0.67	1075.7