SLAC
EXO: Enriched Xenon Observatory
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EXO-200 Build & Commissioning
e beam welding e beam welding
The vessel, during electron beam welding the detector vessel the detector vessel
The copper vessel the TPC ad LXe is in. cryostat commissioning at WIPP cryostat commissioning at WIPP
The warm door of the cryostat closed at WIPP. Commissioning in the cryostat Mod1 Commissioning
Commissioning the cryostat. Modeling the APD readout. Modeling the APD readout.
Modeling the APD readout. A test TCP partially built. A test TCP partially built.
A test TCP partially built. The lead shielding mostly installed at WIPP. The lead shielding mostly installed at WIPP.
The lead shielding mostly installed at WIPP. Mod1 from the cryostat's view. Mod1 from the cryostat's view.
Mod1 from the cryostat's view. The class-100 clean room the cryostat is in. The class-100 clean room the cryostat is in.
The class-100 clean room the cryostat is in. The attachment of a readout wire to the frame. The attachment of a readout wire to the frame.
The attachment of a readout wire to the frame. cleanroom thumbnail
The readout of 7 apds. Flex circuit for reading out APD Flex circuit for reading out APD
Flex circuits are used for reading out the detector signals, such as this one for the APDs. APD Testing
Testing setup for APD's..

EXO-200 Design
The inside of the TPC vessel. The inside of the TPC vessel.
The inside of the TPC vessel. Side view of cryostat. Side view of cryostat.
Side view of cryostat. Cross section of cryostat. Cross section of cryostat.
Cross section of cryostat. The end of the vessel. The end of the vessel.
The end of the vessel. The idea of a TPC. The idea of a TPC.
The idea of a TPC. The design of the cleanroom. The design of the cleanroom.
The design of the cleanroom.

EXO-200 at WIPP

Some stuff at WIPP.
More stuff at WIPP.
Even more stuff at WIPP. EXO Collaborators at WIPP
EXO Collaborators at WIPP, getting their miner certification. A group of scientists after training Scientists after completing miner training
EXO collaborators take a 40 hour miner training class. Offices and machining equipment are in containers in the drift Offices and machining equipment are in containers in the drift
Offices and machining equipment are in containers in the drift Welcome to WIPP! Welcome to WIPP!
WIPP is located about 30 miles from Carlsbad, New Mexico.

Moving to WIPP
The 6 clean room modules Clean Room Modules
Our experiment takes place in 6 clean room modules. End Station III at Stanford ESIII at Stanford
The clean rooms were in End Station III at Stanford until summer 2007. Clean rooms on trucks Clean rooms on trucks
The 6 clean room module were loaded on trucks to be driven to WIPP. WIPP can handle it. WIPP can handle it.
WIPP's capability of dealing with shielded radioactive waste meant handling our cleanrooms wasn't impossible. Cleanroom module, going down! Going down!
The cleanroom modules were transported down the waste hoist with less than an inch of clearance on each side. Huge forklift Huge forklife
A large forklift was able to move the cleanrooms to our drift. Empty Drift Empty Drift
At WIPP there was an empty drift waiting for all of the clean room modules to arrive.

Barium Tagging in Gas
Gas Xe Chamber at Carleton Gas chamber for energy resolution
Chamber at Carleton for studying energy resolution in gaseous Xenon. Chamber for barium ion spectroscopy in gas barium ion spectroscopy in gas
Chamber for barium ion spectroscopy in gas Spark gap for generating barium ions Spark gap for generating barium ions
Barium ions are generated through a spark gap. First seen fluorescence in Gas Xe First fluorescence in Gas Xe
The horizontal band is barium ions that are fluorescing under a 439.5nm laser light at ~25 torr of argon gas. Both wavelengths are seen Both wavelengths are seen
The applied red filter shows that the fluorescence contains both wavelengths from the two transitions.
Barium Ion Grabbing
RIS Laser Setup
RIS Laser Lasers for barium ion spectroscopy barium ion spectroscopy lasers
Lasers for barium ion spectroscopy Linear trap for ion spectroscopy Linear trap for barium ion spectroscopy
Linear trap for barium ion spectroscopy. Trapping electrode region Linear trap for barium ion spectroscopy
Trapping area of electrodes. end of trap end of trap
The trap consists of 4 parallel electrodes. Ion Counting Ion Counting
We are able to count the number of Barium ions in the trap. Cold! Cold!
A sensor for the end of our cryo-tip for measuring xenon ice thickness. Trap Schematic Trap Schematic
Diagram of how the trap works.
EXO-200 Veto Counter
Testing Veto panels testing veto panels
Testing the muon veto system. testing veto panels testing veto panels
Testing the muon veto system.

Miscellaneous
Our enriched Xenon Enriched Xenon
The largest stockpile of enriched isotope not for miliatary reasons - 200 kg of enriched Xenon. Russian Centrifuges Russian Centrifuges
The enriched Xenon comes from centrifuges in Russia. Make science, not war! EXO Week 2008 EXO Week 2008
The collaboration at EXO Week 2008. Copper Storage Copper Storage
All materials need to be radiopure, so they are protected from cosmic rays. This is a bunker for copper. Machine Shop Machine Shop
We have our own machine shop underground so materials can be machined with minimal cosmic ray exposure. Cleaning the Cryostat Cleaning the cryostat
All parts are thoroughly cleaned in a clean area before going into a clean room. Clean room at Alabama Clean room at Alabama
Clean room conditions are necessary for much of the work. Ge detector Ge detector
Measuring radioactivity is done many ways, including this Germanium detector at Alabama. Lead stacking physicists Lead stacking physicists
EXO collaborators after finishing stacking the lead at WIPP.