History of PIBETA Counters 1999 - 2001

 

Counter

Type

Mounted

Dismounted

Comment

B0

Start 1999

1.October 1999

4-fold instead of 2-fold

B0

1. October 1999

10. March 2000

Exchanged due to possible radiation damage

Better light collection ???

B0

10. March 2000

May 2001 (?)

Same, but immersion in light guides to fix scintillator

B0

May 2001 (?)

 

Exchanged due to possible radiation damage

 

 

 

 

 

Active Degrader

Start 1999

21. June 1999

Wavelength shifter readout

No full target coverage

 

Active Degrader

21. June 1999

Still in

‘Beaker Form’, no WLS

full target coverage, better signals

Active Degrader

SPARE

 

Spare was built in 2000; stored in the PIBETA Lab, shelf left side

 

 

 

 

 

Active Target

Unsegmented cylinder

Start 1999

1. June 1999

Segmentation needed

Active Target

1. June 1999

Still inside

Light output could be better

Active Target

May 2001 (?)

 

Square shapes for inner segments for better light collection

Better mechanical mount

Not tested yet!!!

Active Target

SPARE

 

In preparation; to be finished May 2001 -> B. Zimmermann

 

 

 

 

 

 

MWPC 1

17. November 1999

RUN 21793

 

Radiation damage on chamber 1

 

Chamber fixed and is now spare chamber

 

Spare chamber 2 is under construction

 

 

 

 

 

 

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hp.wirtz@psi.ch    09-Mar-2001

last update:          09-Mar-2001