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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last update: 09-Mar-2001