Update on Aging Studies

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Update on Aging Studies Rocky So Supervisor: Christopher Hearty University of British Columbia, Canada rockyso@physics.ubc.ca DCH Parallel Session SuperB Collaboration Meeting May 29th, 2011

Recap Age chamber with a 100 mCi 55Fe source; measure 55Fe spectrum with a low-intensity source Monitor current, 55Fe peak location (gain), and ratio of small pulses to 55Fe interactions Number of small pulses increase as Malter effect sets in. Rocky So May 29, 2011

Recap He:Isobutane 80:20 (no water) Same chamber aged since Dec is still alive 2000V 1480V 1480V Rocky So May 29, 2011

Fe55 Spectrum (Low-intensity) Channel Number Rocky So May 29, 2011

Gain Correction by Density Assume that the first 2 months of aging has no effect on Fe55 peak location Assume linear relationship Assume ideal gas rms of pressure(mb)/temperature(K) is 84 channels rms after correction is 54 channels (distance from points to line) Still some scatter Rocky So May 29, 2011

Reference channel = 1160 error bars = 54 channels Rocky So May 29, 2011

No convincing sign of increase yet Rocky So May 29, 2011

Gain Drop Before Aging Babar saw 8% drop in gain 54 rms channels/1160 channels = 5% scatter after density correction, possibly due to gas composition variation Checked for reproducibility Current chamber probably not sensitive enough to see the gain drop 77/23 He:Iso causes 38% increase in pulse height Gas fluctuated up to 79.6/20.4 Build 2 new chambers using aluminum field wires Age one but not the other to correct for gas variation and composition uncertainty (tndc 98-86) Rocky So May 29, 2011

Sense Wire Current with Hot Fe55 This is before density correction New gas bottle Wrong voltage No current spikes or increase observed Rocky So May 29, 2011

Charge Distribution along Wire Simulated charge by throwing random photons from source to hexagonal cell Probability of interaction inside cell is assumed to be proportional to length it traverses Central centimeter of wire receives 7.8% of total charge (effective length = 1cm/7.8% = 13cm) Agrees with Boyarski C. Lu’s papers in princeton… tndc notes… Rocky So May 29, 2011

Outlook New chamber almost complete Continue to age chamber String dead chamber with new wires Rocky So May 29, 2011

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