the hawc detector ??? type of connection select which (of all 1,200) pmt is the source of the...
Post on 16-Dec-2015
214 Views
Preview:
TRANSCRIPT
Remote Monitoring andData vs. Monte Carlo Comparison
for the HAWC ExperimentJennifer Ranta
Michigan State UniversityREU Summer 2014
The HAWC Experiment High Altitude Water Cherenkov (HAWC)
Detection of high-energy gamma rays (photons) primarily, but also cosmic rays (protons, mostly)
Sources in energy range 100 GeV to 100 TeV
Able to observe:
Gamma Ray Bursts (GRBs) Compact object (black holes, neutron stars) mergers Core collapse supernovae No TeV photons have been seen from GRBs to date (max 120
GeV)
Other Gev - TeV emitters in our galactic neighborhood & beyond!
Always on! And very wide field of view
Map out the sky in the GeV - TeV range as never before
Principle: Cherenkov Radiation in water
The HAWC Detector300 tanks of water each with a light-tight
bladder & 4 photomultiplier tubes (PMTs)
to detect Cherenkov light
Currently have 250 tanks, plan to finish the remaining 50 tanks by the
end of this winter. Have been taking data however for over 2
years already!
At 4,100m, HAWC should be able to detect more and lower energy events than Milagro. HAWC is located in Mexico, in the valley between extinct and dormant volcanoes Sierra
Negra and Pico de Orizaba (respectively)
Remaining 50 tanks to beconstructed will be built here, finalizing the array of 300 tanks
Counting House (where electronics are located)
HAWCmon HAWC experiment involves countless components &
instruments and many universities (in the U.S. and Mexico)
Not in a particularly easily accessible location for most collaborators
Need a remote monitoring
system!
HAWCmon! With this website,
HAWC members can check the
status of the detector and its
numerous components from
anywhere!
Shift Wizard
There’s about 150 people on HAWC, so at least 1 person must always be designated to be responsible for remotely checking detector
But how to make it so everyone on HAWC, not just the experts, know what to look for?
“Shift Wizard” added to HAWCmon system However, it only had 2 questions... Now has 27 (complete with links and plots)!
Screen Shots of Shift Wizard
HV Measurements
High Voltage (HV) measurements missing Finally arrive...but measurement names are
unhelpful 64 channels x 2 values (voltage and current)
= 128 entries descriptively renamed Now include channel number, associated
tanks, warning level values, and alarm level values
Example: hv-1_u6_v W7, Tanks N17, O17
Red boxes indicate which columns were edited
Changing HV Names
Connectivity Database
MANY pieces of equipment = MANY connections
Need to know what is connected to where for error diagnosis and repair
My task: Which PMT is connected to where in which Front End Board (FEB) Crate = 1,200 Connections
There are 1,200 PMTs (4 per tank labeled A, B, C, & D with 300 tanks) and currently 4 FEB Crates
20 Slots per FEB Crate
16 Channels per Slot
???
Type of connection
Select which (of all 1,200) PMT is the source of the connection
Select the destination of the connection (i.e. where the PMT is physically connected to). Must find the correct Crate, Slot, and Channel Number
Enter the date and time the connection began (or was entered in this case)
Select name of individual adding the connection
Data versus Monte Carlo
Reconstruction code calibrated/tested using Monte Carlo simulated data
But how close are the simulated data to the actual data?
Need to be pretty close for the reconstruction code to work properly on actual data from HAWC
Crab Calibration The Crab Nebula is a very well observed cosmological
object so we know what types of signal/flux & data we should be seeing from it MC data should simulate this well!
We know where in the sky the Crab is & when it should be in our field of view. Thus, take this selected data to see how HAWC is viewing the Crab & if it matches what we should be seeing
We aren't yet seeing it how we should....
BUT, the HAWC detector is still under construction, is the first detector of its kind, and thus is still trying to be fully understood
Red = MC DataBlack = Actual Data
Some Variables Analyzed
rec.nHitTot rec.nTankHit rec.logNPE rec.coreX rec.coreY
rec.CxPE40 rec.CoreAmplitude rec.logMaxPE rec.showerAge rec.zenithAngle
Next Steps
Why is Monte Carlo data so different? How to fix it?
Has HAWC seen the GRBs we expect it to have been able to see? Hope is to have HAWC see GRBs and send alerts to other
experiments/detectors to look at it, too
Improve gamma vs. hadron separation code (to extract gamma ray events from the plethora of cosmic rays)
Improve reconstruction code (especially based off of better Monte Carlo data)
Conclusions
Functional Shift Wizard convenient for all HAWC members
HV measurements can be deciphered easily
PMT FEB connections are implemented into the Connectivity Database
Monte Carlo simulated data is not as comparable to the actual data as we need Detector not simulated properly? Detector construction & understanding is still
an ongoing process!
Special Thanks
Dr. Kirsten Tollefson Dr. Jim LinnemannUkwatta (postdoc)
Sam Marinelli (graduate student) HAWC Collaboration
Michigan State UniversityNational Science Foundation
Additional Slides
PBH Calculations
Primordial Black Hole paper regarding HAWC’s sensitivity to seeing PBHs
Mass accretion significant when compared to the mass loss rate?
Bondi accretion vs. Hawking radiation Turns out there is a difference of 30 orders
of magnitude in the amount of grams per sec lost versus gained….so mass accretion is negligible and does not need to be included in paper
PMTs in each of HAWC’s
300 tanks are arranged to maximize ability to detect
Cherenkov light (shown
here in green)
emitted from incoming particles
(shown here in red)
Sources for Shift Wizard Question Ideas
Milagro Shift Log
Predecessor experiment (similar measurement types)
University of Maryland's monitoring page
Had some data and plots that were not on HAWCmon yet
General comments/requests from HAWC team members about what they'd like to see in a Shift Wizard
HV Renaming Information
PMT FEB Information Electronics Configuration page
Source Location
Based on the timing of when PMTs where hit, the angle of the shower can be
calculated. Thus , the original
particle came from the direction perpendicular to the shower front.
This is how HAWC’s
measurements can show where the high energy gamma rays are
coming from
Tim
e f
rom
firs
t im
pact
Data used in MC Comparison
crab-v1-26-00-high-nChan_cut.root
This data was taken when the Crab Nebula was within HAWC’s field of view at some point and thus have a significant read out of the Crab
top related