Summary of Spring 2015 Commissioning run A. Deur Jefferson Lab

Summary of Spring 2015 Commissioning run

A. DeurJefferson Lab

A. Deur. GlueX collaboration meeting. 05/12/2015

Monday, May 11, 2015

1.Commission goniometer and diamonds ✓.

2.Commission H2 cryotarget and verify alignement ✓.

3.Run DAQ in Block-Mode at high rates ✓.

4.Optimization of triggers ✓.

5.Callibrate calorimeters with π0 .

6.Complete other detector callibrations and alignments ✓.

7.Commission beam stability feedbacks .

8.Establish that we can run the solenoid at 1300A ✗.

9.Commission accelerator RF timing ✓.

10.Commission photon polarimeter .

11.Commission Total Absorption Counter ✗.

12.Use (polarized) photons with 3.4mm collimator ✗.

Spring 2015 goals


Highest priority

Lower priority

High priority

Important


New conditions for Spring 2015 commissioning

•10.5 GeV Nominal; CHL failure: all useful data taken at 5.5 GeV.•~5 nA-200 nA. •RF timing available.

•Diamond radiators: SI45-S90 (90µm), J1A50 (50µm), J2A100.

•Cryotarget. (30cm. No more long air gap around the target).

•Polarimeter on the beam line. Tot. Abs. Count. available. Static profiler.

•Improvements on all subsystems (DAQ, trigger, online, Start Counter straighten,...)


•e- beam:

Run plans:https://halldweb.jlab.org/hdops/wiki/index.php/Spring_2015_Commissioning_Plan

https://halldweb.jlab.org/hdops/wiki/index.php/Spring_2015_6GeV_Commissioning_Plan

Original (10.5 GeV):

Revised (5.5 GeV):

Disclamer: Accelerator commissioning: not physics running.


https://halldweb.jlab.org/hdops/wiki/index.php/Spring_2015_Commissioning_Plan

https://halldweb.jlab.org/hdops/wiki/index.php/Spring_2015_Commissioning_Plan



Run plan


Tasks at same y-axis value are interspersed

Tune

e- b

eam

to ta

gger

Hal

l (8h

)R

esto

re !

beam

(8h)

goni

o. c

omm

. (8h

)In

itial

subs

yste

m c

heck

out (

8h)

µsc

ope

bias

stud

y (2

h)FF

B te

sts (

8h)

LH2 t

gt c

omm

. (em

pty

run)

(38h

)

goni

o. c

omm

. (8h

)

ST,T

OF

FCA

L,BC

AL

trig

. for

DC

alig

n,FC

AL-

ST c

oinc

.,tr

igge

r st

udie

s

48h

DA

Q te

sts (

16h)

Sol. Magnet at 1200A

Target filled (Mostly) empty tgt Filled tgt

PS tr

igge

r co

mm

. (8h

)So

l. ra

mp

dow

n

DC

alig

nmen

t (20

h)

goni

o. c

omm

. w/

FCA

L-TO

F tr

igge

r (8

h)

Possible furtherDC align. if needed

mul

ti tr

igge

r co

mm

. (8h

)

Sol. B=0

goni

o. c

omm

. (8h

)So

l. ra

mp

upPr

oduc

tion

run

(8h)

Sol. I=1300A Sol.

I=12

00A

goni

o. c

omm

. (8h

)

prod

uctio

n ru

n (2

0h)

10 days period.(5.5 GeV, no extension)


Run plan


Tasks at same y-axis value are interspersed

Tune e- bea

m to ta

gger H

all (8h

)Res

tore ! b

eam (8h

)gon

io. com

m. (8h

)Init

ial sub

system

checko

ut (8h)

µscope

bias st

udy (2h

)FFB

tests (

8h)

LH2 tgt

comm.

(empty

run) (3

8h)

gonio. c

omm.

(8h)

ST,TO

FFC

AL,BC

ALtrig

. for D

C align

,FC

AL-ST

coinc.,

trigger

studies

48h

DAQ t

ests (16

h)

Sol. Magnet at 1200A

Target filled (Mostly) empty tgt Filled tgt

PS trig

ger com

m. (8h

)Sol

. ramp

down

DC ali

gnment

(20h)

gonio. c

omm.

w/FC

AL-TO

F tri

gger (8

h)

Possible furtherDC align. if needed

multi t

rigger c

omm.

(8h)

Sol. B=0

gonio. c

omm.

(8h)

Sol. ra

mp up

Produc

tion run

(8h)

Sol. I=1300A Sol. I=

1200A

gonio. c

omm.

(8h)

produc

tion run

(20h)

e- b

eam

tun

ning

or n

o be

am

Esta

blis

h ph

oton

bea

m

Stra

ight

tra

ck r

uns

DA

Q/t

rigg

er w

ork

Act

ive

col.

scan

s

Dia

mon

d al

ignm

ent

(J1A

50, 5

0µm

)

Fri. Apr. 24th

Pola

rize

d da

ta t

akin

g

Mea

nwhi

le,tr

igge

r w

ork

DA

Q/P

S/Tr

igge

r w

ork

Dia

mon

d al

ignm

ent

(SI45-S9

0, 9

0µm

)

e- b

eam

tun

ning

Dia

mon

d al

ignm

ent

(SI45-S9

0, 9

0µm

)St

raig

ht t

rack

run

s

Microscope bias voltage study

FFB

test

Dia

mon

d al

ign.

(90µ

m)

DA

Q/T

rigg

er w

ork

Unp

olar

ized

run

s

FFB

test

Stra

ight

tra

ck r

uns

Empt

y ta

rget

run

DA

Q/T

rigg

erFF

B te

st

DA

Q/T

rigg

erU

npol

ariz

ed r

uns

Dia

mon

d se

tup

(50µ

m)

Pola

rize

d da

ta t

akin

gQ

uenc

h

Stra

ight

tra

ck r

uns

DA

Q/T

rigg

er

Actual progression:

Stra

ight

tra

ck r

uns


Timeline of actual run


Feb. 13: Starting Acc. beam restoration

May. 4, 7am

: End of run

March 19-25: Restoration of 10.5 GeV beam to Hall D.Why so long ?

•Usual accelerator woes (BLM, CHL trips, LCW problems...)

•Lower priority compared to Hall A. Could not run A&D concurently: RF separator needed to be functional.

Power failure. Dammaged one CHL. Cannot run 12 GeV CEBAF.

Decision to run 5.5 GeV withpossible 10 days extension.Extension granted only to Hall B(and a bit for Hall A). Priority shifted from mostly A to mostly B.

Apr. 23: Start 5.5 GeV beam tunning to Hall D

Apr. 25: Good 5.5 GeV beam available

May. 2, 14h37: Solenoidquenched.

B=0

Beam restoration


Achievements


•First photons on liquid Hydrogen target.

30 cm H2 target

Vacuum chamber

exit window

Solid plastic target

Vertex reconstruction: (Simon Taylor)


Achievements


•Empty target vertex reconstruction for target alignment verification. (Simon Taylor)

H2 gas

air


Achievements


•Goniometer commissioning. 2 diamonds aligned. Coherent peak seen. Ken Livingston, Hovanes Egiyan, Paul Mattione.

Coherent peak seen on tagger detectors.


Achievements


Coherent peak also seen with pair-spectrometer.

With amorphous radiator: no coherent peak

x 5.5 GeV

x5.5 GeV

With diamond radiator: coherent peak

•Goniometer commissioning. 2 diamonds aligned. Coherent peak seen. Ken Livingston, Hovanes Egiyan, Paul Mattione.


Achievements


•π0 peak seen in the two calorimeters (Justin Steven, Will McGinley).

•3.5 hour run: 20% of the stat. of the Fall 2014 run. •Good statistics (DAQ and triggers: Sergei Furletov, Alex Somov) (~1% of what would be needed for a good BCal calibration.)

BCal.


Achievements


FCal.

•ρ peak also seen.

•π0 peak seen in the two calorimeters (Justin Steven, Will McGinley).


Achievements


3.5h of data with polarized photons. (other few hours of polarized data available. different conditions)

No asymmetry observed with amorphous radiator:

ρ0 meson production

Justin Stevens

ρ0 π0

π0 meson production


Summary


Gluonic

Feb. 27. We waited fordeparture full of hopes: up to 2 months of 10.5 GeV beam.RF Separator commis.+3 halls running withlow priority for Hall D makes us wait4 weeks before seeingacceptable beam.


Summary


Gluonic

March 25. Just as beam became acceptable, a power failure dammage an accelerator cooling plant.(Ice dammages).

Accelerator repairattempts. Uncertaintyon the outcome.



Summary


Gluonic



Continue at 10.5 GeV?

Shutdown

Continue at 5.5 GeV?Extension?



Summary


Gluonic




Shutdown

Apr. 25-May 2:Smooth sailingthrough 5.5 GeVcommissioning: Coherent peak,DAQ, triggers...


Gluoni

c



Summary


Gluonic




Shutdown



Gluoni

c

Gluonic

May 2.Solenoidquench,after 3.5hof data taking with polarized photos



Summary


Gluonic




Shutdown


Continue at 5.5 GeV?Extension? May 4, 7am:

Beam shut down (no extensionfor Hall D).

Gluoni

c

Gluonic


⚓



Summary


Gluonic




Shutdown


Continue at 5.5 GeV?Extension? May 4, 7am:

Beam shut down (no extensionfor Hall D).

May 6:First physicsassymetriesseen.

Gluoni

c

Gluonic


⚓

⚓



Spring 2015 goals


High priority

Obtaining physics asymmetries summarizes the outcome of reaching these goals.

1.Commission goniometer and diamonds ✓.

2.Commission H2 cryotarget and verify alignement ✓.

3.Run DAQ in Block-Mode at high rates ✓.

4.Optimization of triggers ✓.

5.Callibrate calorimeters with π0 .

6.Complete other detector callibrations and alignments ✓.

7.Commission beam stability feedbacks .

8.Establish that we can run the solenoid at 1300A ✗.

9.Commission accelerator RF timing ✓.

10.Commission photon polarimeter .

11.Commission Total Absorption Counter ✗.

12.Use (polarized) photons with 3.4 mm collimator ✗.


Documents

Summary of Spring 2015 Commissioning run A. Deur Jefferson Lab