HAWC work at CSU

Because an image is worth more than a thousand words... Enjoy our work!

Main contributions: fabrication of bladders, setup of a full-size Water Cherenkov Detector at CSU, development of software and analysis tools.

Production of bladders

We have setup a bladder factory off-campus in mid-2011. We are currently producing 4 bladders per week. The new CSU design includes PMT mounts for wet deployment, strenching ring loops at the bottom, and also a new design for the hatch.

Bladder factory

New HAWC bladder factory at CSU.

Bladder factory

Ad-hoc tables for the tops and bottoms of the bladders.

Bladder factory

Long table to weld together the sides of the bladders. The welder runs on a rail so that the material does not move.

Bladder factory

The design of the factory follows the "flow" of the material. We also have enough room to test on site.

Prototype Water Cherenkov Detector

We have a full-size WCD prototype at CSU to test all the different components of HAWC. It has been fully operational since March 2011. We re-deploy the new design bladder, and the new roof in April 2012. We are currently taking data with 7 PMTs, four scintillators burried underground, one scintillator on top of the volume of water, and the full laser calibration system.

Roof installation

Installation of the new roof on the CSU prototype.

CSU WCD - Apr 2012

WCD reployed in April 2012.

Lab work

We currently have three labs going for different components. Local slang: D218 (Miguel's lab), E10 (the HEPPA lab), and Weber 10 (the new lab).

Calibration & others tests (D218)

John Matthews (UNM), and Petra Hüntemeyer (MTU) came to do some first test with the laser calibration for the HAWC PMTs. We have also built here a portable welder, and two testing devices. One device is being used to measure the rate of water leakage for a given hole size, and another one for testing the PMTs under 7 psi of water pressure.

Megan, Dave, Petra, and John working on the laser calibration tests in D218.

Four students from Harvey Mudd College came (with Brenda and Michael) to work at CSU. Among other engineering fun tasks, they're working on the design of the weights for the PMTs.

Preliminary tests in D218 on the first PMT weights.
VIP note: HAWC is not using weights anymore thanks to our own design of a "wet deployment" mechanism.

As an undergaduate project, Mark built several small-scale welding machines. The preliminary tests were very successful! Bring on the big bladders!

Initial bladder tests and current hatch kits (Weber 10)

Based on the Auger experience, we made the bladders for the VAMOS engineering array in the tight spaces of Weber 10. We currently use this lab to produce the hatch kits, and test the PMTs under 7 psi of water pressure.

We built the VAMOS bladders in Weber 10 (2010).

Bladder fab status in Oct 2010. Getting ready to produce the first liners.

Paddles & Muon Telescope (E 10)

As an undergraduate project, Petra built a muon telescope with four scintillators in coincidence.

Petra cut the plastic paddles, attach them to the PMTs, build the bases for the PMTs, setup the coincidence circuit, and build the support structure for the four paddles. These are the four paddles that are burried under the prototype water-Cherenkov detector taking data at CSU.

Dave testing seams using a small welding machine in E10.

Currently working on

  • Production and deployment of bladders
  • Operation of the full-size detector prototype
  • Analysis of the scalers
  • Measurement of temperatures (at the electronics racks and inside the tank)
  • Study of temperature effects on the data
  • Analysis of laser calibration data
  • Muon trigger studies
  • GRB analysis
  • Calibration using cosmic ray data
  • Event display