Development of a Liquid Scintillator and of Data ... - Borexino - Infn

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7 The Source Runs in CTF2 7.3 The Source Runs The sources were inserted into the Inner Vessel from the purification clean room on the top of the CTF tank. They passed through the scintillator inlet tube. Normally the vessel with its plumbing is allowed to move freely relative to the water tank. To stabilize it in a certain position it is counterbalanced by a weight connected over a rope pulley. During the source operations the plumbing-vessel assembly was held in place with clamps. The top flange (normally used as attachment point for the rope to the counterbalance weight) was removed and replaced by a flange with a short ’adapter tube’ attached, that has an inner diameter only few mm wider than the diameter of the steel rod to which the source was attached. The sources were inserted through this opening. To prevent air (oxygen and Rn) from getting in contact with the scintillator, a continuous nitrogen flow in the outward direction was maintained. The nitrogen was introduced into the plumbing at a tee below the top opening and it exited through this opening (see fig. 7.3). Figure 7.3: Setup for the source insertion. For the positioning of the sources we used a stainless steel rod with a hinge so that positions on the z-axis as well as positions off-axis could be measured. The rod was divided into 8 sections, each 1 m long, that could be screwed together while lowering the source into the IV. This was necessary because of the height limitations imposed by the cleanroom ceiling. 100
7.3 The Source Runs Source no. 1 was mounted with a short nylon cord directly to the steel rod. With this source we could measure only positions on the z-axis. With source no. 2 we used a short coupling to a hinge and a 48 cm lever arm that could be lifted up to a horizontal position using a nylon pull-string (see fig. 7.4). The source was mounted with a short cord at the end of the lever arm. With this source we measured points on the z-axis as well as points with a horizontal distance of 48 cm from the z-axis. Figure 7.4: Stainless steel rod with hinge for the positioning of the sources inside the Inner Vessel. If the nylon string is loose, the lever arm hangs vertically down. If the nylon string is pulled upwards, the lever arm is brought into a horizontal position. The nominal source positions have a rather big uncertainty: - As the source was mounted on a steel rod in principle the position on the z-axis should be known very accurately. The measurement was always done relative to the top flange 101
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Fakultät für Physik der Technisch
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Abstract The first chapter contains
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Übersicht an Radionukliden in BORE
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Contents 3 The Counting Test Facili
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Contents viii
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1 Solar Neutrinos Figure 1.1: The p
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1 Solar Neutrinos 1.2 Detection of
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1 Solar Neutrinos With this detecti
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1 Solar Neutrinos 1.2.3 Future Expe
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1 Solar Neutrinos 1.3.2 Astrophysic
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1 Solar Neutrinos Using the unitari
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1 Solar Neutrinos km in the earth.
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1 Solar Neutrinos 16 Solution ¡Ñ
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2 The Borexino Experiment The relat
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2 The Borexino Experiment Figure 2.
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2 The Borexino Experiment 2.2 The D
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2 The Borexino Experiment 2.3 Detec
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2 The Borexino Experiment 2.3.2 Anc
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2 The Borexino Experiment which per
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2 The Borexino Experiment 2.4 Backg
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2 The Borexino Experiment ns; Rn-
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2 The Borexino Experiment volume wo
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3 The Counting Test Facility (CTF)
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4 Position Reconstruction of Scinti
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4 Position Reconstruction of Scinti
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Page 72 and 73: 5 Particle Identification with a Ne
Page 86 and 87: 6 Test of a PXE based scintillator
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Page 112 and 113: 7 The Source Runs in CTF2 102 of th
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Page 124 and 125: Summary and Outlook possible to dis
Page 126 and 127: Bibliography [Ade98] E. G. Adelberg
Page 128 and 129: Bibliography [Bra00] L. De Braeckel
Page 130 and 131: Bibliography [Lom97] P. Lombardi, D
Page 132 and 133: Bibliography [Vog96] R. B. Vogelaar
Page 134 and 135: Danksagung An dieser Stelle möchte
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Development of a Liquid Scintillator and of Data ... - Borexino - Infn

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