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.