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Thomas R. Kobilarcik
Neutrino Beams and Instrumentation, 2019
22 October 2019
Booster Neutrino Beamline Status
Oct. 22, 2019 NBI2019 -- T. Kobilarcik 2
MiniBooNE (off)
ANNIE (new-ish)
MicroBooNE (new)
Booster Neutrino BeamlineTarget Hall
Booster
Booster Neutrino Beamline and
Detectors
SB-ND (new)
ICARUS (new)
Imagery ©2019 Google, Map data ©2019
Oct. 22, 2019 NBI2019 -- T. Kobilarcik 3
The horns have pulsed
~3/4 of a billion times
Since turning on, BNB has transported
3.6E21 protons
BNB is assessed for 5×1012 protons per
pulseat 5 Hz average
0.00E+00
5.00E+19
1.00E+20
1.50E+20
2.00E+20
2.50E+20
3.00E+20
3.50E+20
4.00E+20
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
Annual Protons on Target
Off-target running(limited intensity)
• The “big news” – Horn #2 failed
– Alignment module also failed and had to be redesigned
– Took advantage of time to inspect decay pipe
• Then Horn #3 developed a problem (fixed in place)
– Upgraded target hall profile monitors
• Prior to Horn #2 failure:
– Ran in “off target mode” for dark matter search
– Installed temporary profile monitors at 25 m absorber (to
measure beam trajectory)
• Since Horn #3 installation:
– Installed rapid trim to facilitate off-target running if requested
– Measured bunch length before and after bunch rotation
– Upgraded accelerator signal distribution system to better serve
broadened Short Baseline program
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Horn #2 FailedHorn is buried in target pile
Part of beamline is removed to allow for working space.
Horn is transferred directly into coffin, reducing exposure
Second Horn Trivia• December 2004 to 2015.
• 1/2 billion pulses.
• Two of the six water lines had been valved out due to
leakage, but still had adequate cooling.
• Provided new data regarding fatigue of aluminum.
• Water is continually circulated, even during shutdowns
and off-target running, to avoid stagnation.
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Target and Horn Assembly
Target/Horn Assembly sits on an alignment module in the target pileWhen we attempted to remove horn, found that alignment module no longer worked –needed a new alignment module
Oct. 22, 2019 NBI2019 -- T. Kobilarcik 8
Old alignment module used commercial screw jacks.
After 15 years, parts corroded, grease hardened, nothing worked.
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Lifting Wedge
Brackets to hold push rod
Moving parts are anodized and have provision for air
bearing
New Alignment Module
Design by D. Pushka,AD/Target Systems
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While the new alignment module was being designed …
Deployable mast for Hall probes 1 & 2
Hall
probe 1
Hall probe 2
Forward-looking LIDAR
Hall probe 3
Camera & Light & Mic
Rear-looking LIDAR
Water level
GyroAccelerometer
LabJackdigitizer
PoE / USB power distribution system
Tether & strain relief
Flipper arm
Slide courtesy of R.L. Cooper*Finding Radiation Evidence in the Decay pipe
FRED*: Instrumentation Package
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Boldly go where no one has gone…
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FRED in the collimator
FRED climbing the 25m step
FRED ready to go into the
horn chase
FRED at the 50m absorber, what the heck is that…
Deployment Ladder
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Second generation low-mass multiwires. Welded joints, easy access to wire plane, more robust mechanical design. Separation between planes remains at 110 cm and planes retain 0.5 mm pitch. New instrumentation package was installed during Spring, 2015, horn change.
Wire planes are attached to removeable flange.Able to change planes if wires break.
About a month into running, horn
shorted to ground. This was caused
by a corona cap that came loose and
fell off. (Cap reduces corona cause by
screw threads.)
Oct. 22, 2019 NBI2019 -- T. Kobilarcik 15
ceramic insulator
water drain line(at voltage)Horn box
(ground)
Hole in horn box through which the
corona cap was removed.
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Access port is now a feature of BNB horns
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Rewind to before Horn #2 failure
SWIC hangs below absorber module
Hanger sits on top of module.
Profile monitor wires are referenced tofiducials on top of hanger. Referencing canbe done in the shop with entire hangerassembled.
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Used in the dark matter search. Needed to precisely know where in the detector the proton beam was aimed
Temporary Profile Monitors at 25 m Absorber
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Forward to Horn #3 running
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Installed at upstream focal point of final focusing triplet.
(Converts an angular kick to a parallel offset)
Able to ramp up and down in <1/30 of a second (half a Booster cycle).
Can be triggered independently of horn – not rate limited by horn.
Rapid Trim Magnet for Off-Target Running
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2 GHz sample rate over entire spill.
Data is recorded every pulse, and is available through the Intensity Frontier Beam Database.
Resistive Wall Monitor Put to Use
Oct. 22, 2019 NBI2019 -- T. Kobilarcik 22
Bunch Rotation OFF
Individual bunches
Trigger threshold
Problem with digitizer –drops every fourth record
Digitizer measures voltage induced by beam every 0.5 ns
Bunch Rotation ONSpacing between bunches remains the same
Beam looks “broader”
How much?
Oct. 22, 2019 NBI2019 -- T. Kobilarcik 23
0.000
0.100
0.200
0.300
0.0 5.0 10.0
Bunch Rotation OFF
(horizontal units: ns)
0.000
0.100
0.200
0.300
0.0 5.0 10.0
Bunch Rotation ON
(horizontal units: ns)
Based on 10 measurements eachwith bunch rotation on and off,bunch rotating the beam increasesthe 1-sigma time-spread at theresistive wall monitor from1.48±0.03 ns to 2.15±0.13 ns.
Increase time spread, but decrease momentum spread.
Beam is smaller in high-dispersion regions → lower losses.
Under good conditions, the hourly rate could increase by ~7%.
Bunch Rotation
Oct. 22, 2019 NBI2019 -- T. Kobilarcik 24
MB Hall
100m Hall
LArTF
MI12S
SB-ND
SB-FD
Imagery ©2019 Google, Map data ©2019
Many useful signals (Booster extraction, beam crossing RWM) are available in MI12S
Had been treating them as one-offs when sent to individual experiments
Coordinating with Neutrino Division to send standard signals to each facility. From that point, experiment can use as needed.
Dedicated rack in MI12S for experiments to use. Provides clean separation between AD
and EXP hardware.
Effort lead by Alyssa Miller, AD/External Beams
Fan-out to facilities(Mark Austin, AD/Controls
Accelerator Signals
Oct. 22, 2019 NBI2019 -- T. Kobilarcik 25
Decay pipe buried in 12 to 15 feet of aggregate.
Aggregate is surrounded by two impermeable liners.
Early on we found a leak in the impermeable liners
Ground Water Problems
Install high-density polyethylene cover to keep water away
from liner.
This did not work, either
Oct. 22, 2019 NBI2019 -- T. Kobilarcik 26
Project lead by Cons GattusoAD/Engineering Support
Backup Slides
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Single Quadrupole
Triplet
Doublet
Matching
Permanent Magnets
Final Focusing TripletCarrier Pipe
Beamline -- Schematic