BREWERRECENT
IMPROVEMENTS
13th Brewer User Group MeetingBeijing, China
12 – 16 September 2011
Arjan Hoogendoorn
Brewer Specialist
KIPP & ZONEN
TOPICS
• Where do improvements come from?• Zenith window• Cables and isolation• Photomultiplier• Other improvements• Recent work
WHERE DO IMPROVEMENTS COME FROM ?
Improvements come from:•Requests by Environment Canada (EC)•Suggestions from users•Suggestions from within Kipp & Zonen•Health, safety and environmental requirements
Important modifications to the Brewer operational performance are overseen by EC
ZENITH WINDOW
• Zenith window has been made longer• Improves performance of the Brewer at high zenith angles• A retrofit kit is available
OLD SHORT WINDOW NEW LONG WINDOW
CABLES & ISOLATION
• Power and communication cables are more durable
• Accessory power cable is replaced by one with a connector
• Separate cable with connector for the surge suppressor
• New Brewers are supplied with an optically isolated RS 422 - RS 232 converter for connection to the PC
PHOTOMULTIPLIER
• Electron Tubes was no longer capable of making PMTs that meet the requirements of the Brewer
• Specially made Hamamatsu PMTs are now used• Tube diameter is the same as Electron Tubes PMTs, but the
length is different• A retrofit kit is available for PMT replacements
OTHER IMPROVEMENTS
• A new quartz diffuser with better transmittance is used in filter wheel 1
• The sealing of the instrument cover is improved.• The azimuth tracker pillar has been strengthened.