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Monitor for SVD1.6 and 2.0

Monitor for SVD1.6 and 2.0. T. Tsuboyama (KEK). SVD1.6 monitors. RTDs Almost every 5 cm in the aluminum part. 6 RTDs for the beryllium part in order to confirm the validity of the FEM simulation. Radiation monitors Hybrids on SVD are same as before.

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Monitor for SVD1.6 and 2.0

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  1. Monitor for SVD1.6 and 2.0 T. Tsuboyama (KEK)

  2. SVD1.6 monitors • RTDs • Almost every 5 cm in the aluminum part. • 6 RTDs for the beryllium part in order to confirm the validity of the FEM simulation. • Radiation monitors • Hybrids on SVD are same as before. • Hybrids on the IP chambers were made again • RADFETs were not installed. • PIN analog output will be send to the KEKB transient recorder. • A humidity sensor (Same as before) • Strain gauges are installed • In order to estimate stresses to the chamber. • Interpretation is not trivial

  3. Accidents • Two RADFETs used for the nominal dose value are not stable now. • Several RTDs and one strain gauge have been broken while the accelerator beam chamber was connected to the Belle IP chamber. • Wires of several RTDs was broken while RTDs were put to the IP chamber.  Improvement is necessary for SVD2 monitors.

  4. SVD1.6 cooling • The helium circulation system was tuned up. • A high-temperature bearing is introduced. • The pulleys are aligned very carefully. • The beam is aborted about 20 msec after a problem is identified by the sequencer. In SVD1.4, a 30 seconds delay was inserted in order to reduce false beam aborts. • Oxygen is purged from the circulated water by bubbling of nitrogen gas in the water tank. This will reduce the possible aluminum corrosion rate. (No indication so far)

  5. SVD2 monitors • Installation will start after the tungsten masks are fixed to the chamber. • All sensors and radiation hybrids are ready. • One monitor cable came off from its ZIF (zero insertion force) connector while SVD2 is taken out from the assembly stage. We should fix the cable well. • Improvement in the RTD connection is necessary. • Assembly of connection box has finished in Ljubljana (taken care by D. Zontar). • RADFET calibration at >Mrad is in progress (lead by S. Stanic.) • W. Trischuk has an idea of installing diamond detectors for instantaneous radiation measurement. (experimental?)

  6. SVD2 IP chamber cooling • The pressure drop was measured for the real SVD2 chamber and the real paraffin circulation system. • The pressure drop versus paraffin flow rate is found to be same as that of the mock up. • The pressure drop in the tube was also measured. • Comparison with the design value is in progress. • News: A spare of the SVD2 IP chamber has been ordered to IHI. • DOCK/end ring cooling will be not so difficult from the SVD1 cooling.

  7. Summary • Installation of SVD1.6 monitors are done successfully. • Several sensors were dead while/after installation. • Improvement will be done for SVD2 monitors. • SVD1.6 IP chamber cooling system is also improved by minor changes. • SVD2 monitors will be installed soon (next week?) • No major problem is found yet in the SVD2 cooling.

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