Characterization of 900 four-anode photomultiplier tubes for use in 2013 hadronic forward calorimeter upgrade
Başlık çevirisi mevcut değil.
- Tez No: 402631
- Danışmanlar: PROF. YAŞAR ÖNEL
- Tez Türü: Yüksek Lisans
- Konular: Fizik ve Fizik Mühendisliği, Physics and Physics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2012
- Dil: İngilizce
- Üniversite: University of Iowa
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 47
Özet
Özet yok.
Özet (Çeviri)
There is a rejection limit defined based on the specifications of the calorimeter (see in Table 2.1). Among the 900 photomultiplier tubes evaluated for the HF calorimeter only 30 of them were rejected. Of the 30 PMTs rejected, 19 of them w ere rejected for high dark currents. The other 1 ı PMTs failed due to gain values that were too lo w. Overall, they have the same timing characteristics and they satisfy all of the CMS-HF requirements. Hence, they might be ideal candidates in the real experiment at CERN and they would help to reveal the missing piece in the particle physics puzzle by detecting high energy jets and improving the measurement of the missing transverse energy. We will test 900 more PMTs and compare their results with the test of the fırst 900. After all ı 800 have been tested we will sen d the PMTs to CERN for installation for the upgrade. After we install them in the readout boxes they will be used for data calleetion and reconstruction of collision events in the HF Calorimeter. The tests started in January 2011 and stili continue. The anticipated date is June, 2012 to finish all the measurements. After the PMTs are separated in terms of their quality, they will be shipped to CERN.
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