I began to address the problem of attenuating the flasher today. With the
help of Billy in the machine shop we created a threaded coupling that
allows
attachment of our existing attenuators to the main input of the splitter
box. With no attenuation the photodiode signal in the D-tunnel is ~62mV.
I was able to achieve 18mV, 12mV, and 5mV with various attenuators. As
one example of TOF signal. RTOF2bot gave a flasher signal of 6 V on the
scope without attenuation. With the "18mV attenuator" I saw 2 V for this
TOF. As all the TOF signals for the flasher are different I think the
next step is taking data. I will try this on Monday after Karen checks
the DAQ with physics triggers.
Also, I searched for and found spare/used PMTs and bases. I found what I
believe to be 4 spare PMTs and 4 spare bases. I also found 4 "used" PMTs
as these were unwrapped/marked as bad. I found one base marked as bad.
I put the spare PMT's, still in there sealed boxes, on top of the cabinet
in the BLAST counting bay. I put the spare bases in the cabinet. The
used tubes and bases were placed, for now, on the table next to the Sun.
(not the actual sun mind you!)
Pete
----------------------------------------------
Pete Karpius
Graduate Research Assistant
Nuclear Physics Group
University of New Hampshire
phone: (603)862-1220
FAX: (603)862-2998
email: karpiusp@einstein.unh.edu
http://pubpages.unh.edu/~pkarpius/homepage.htm
----------------------------------------------
This archive was generated by hypermail 2.1.2 : Mon Feb 24 2014 - 14:07:29 EST