Measurement of HO HPD noise rates during October 2008 re-commissioning of the CMS magnet at 3.8 Tesla and experience of operation of HO HPDs during CRAFT

Pawel de Barbaro,Sudhakar Katta,Dmitry Vishnevsky,Numan M. Bakirci,Shashi Dugad, Richard Kellogg, Arjan Heering, Rick Vidal,German Martinez,Edward Laird,Davide Gerbaudo,Chris Tully,Jim Freeman,Andris Skuja, Jeff Spalding,Sergey Sergueev, Manuk Zubin Mehta,Atul Gurtu,Gobinda Majumder,Tariq Aziz,S. R. Chendvankar, Mandakini Patil,N. K. Mondal,Sudeshna Banerjee,S. D. Kalmani, P. Nagaraju,B. Satyanarayana,Jasbir Singh, Harinder Singh Bawa, V. K. Bhandari,Supreet Pal Singh,Emine Gurpinar, Ellie Lockner, Phil Dudero, Tullio Grassi, Jeremy Mans,Arno Heister,Vladimir Epshteyn, Vitali Smirnov, Alexandr Vishnevsky,Jason St John,Kerem Cankocak,Sorina Popescu,Alexi Mestvirishvili,Ianos Schmidt, Luis Lebolo, Steven Linn,Sercan Sen, Ken Rossato,Jeff Temple,Patrick Tsang,Jared Sturdy,Kevin Klapoetke

msra（2009）

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摘要

A major problem for HCAL subsystem was discovered during second part of Magnet Test Cosmic Challenge (MTCC) in summer/fall of 2006 MTCC. HPD discharges were observed in HB and HE HPDs (axial B field, with CMS magnet set at 2T) and HO (misaligned E and B fields, CMS magnet set at 3.8T). In this note we concentrate on behavior of HPDs in HO RBXes. Separate note describing behavior of HB and HE RBXes in magnetic field is under preparation. Note that when CMS magnet is set at 3.8 Tesla, HO HPDs on the central wheel (YB0) operate in the fringe field of 0.02T (equivalent to 200 Gauss) while HO HPDs on YB+2/YB+1/YB-1/Y-2 wheels experience magnetic field above 0.2 Tesla (equaivalent to 2000 Gauss).

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magnetic field

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