ELOG CARME

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

CARME

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Entry time:	Fri Apr 4 17:13:55 2025
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> 09:00 Detector still biased to 60V and leakage current has been mostly stable overnight. > Only minor fluctuations observed - attachment 1 > > FEE temps all ok - attachment 2 > Stats at 60V - attachment 3 > System wide checks all ok > > Increasing bias to 80V > 60V 9.45uA > 70V 9.7uA > 80V 80 9.82uA Still have diode response > > 10:15 In prep for taking data with beam tuning have tested the merger and tapeserver. > To enable writing to file had to implement the method in https://elog.ph.ed.ac.uk/DESPEC/36 > Probably a corrupution caused in the difference between the carme system and the aida system. > Now can write data to file. To limit the data of FEEs 01-04 have set threshold to 0xFF > > 10:33 Ion source was started this morning but there was no noticable effect on the leakage currents. > > 10:56 Leakage current is slowly rising continuing the trend at 60V. - Attachment 4 > This could just be the temperature shift during the day or linked to the ion source being powered on. > > 11:18 Pulser peaks for the FEEs using layout 3 and 4. > Layout 3 - attachment 5 > Layout 4 - attachment 6 > The pulser peaks appear to be asymetric and in FEE 7 we are observing a double peak. > Will check the circuit when we next have access. > > 11:23 Have started writing data to disk in advance of them putting beam into the ring. > Writing to R4_8 at around 1.8MB/s. N.B. TapeServer shows the same behavior as AIDA with writing nothing to files R4_0->R4_7 > FEE 01-04 slow comp 0xFF > FEE 05-08 slow comp 0x64 > Pulser running at 50Hz or so > > 14:50 Having been writing to DAQ since lunch. > Leakage currents were mostly stable but we are now seeing an increase in leakage currents at a much greater rate - attachment 7 > > 14:58 Attachment8 Updated leakage currents. > > 15:00 Due to the rapidly increasing bias we asked them to stop the beam. > Motors were then cycled but we did not notice the leakage coming down. > Bias was turned off and then motors cycled again. > Bias was then set to 60V - Run R5 > Bias raised to 80V - R6 > Carlo requested we stop writing data to disk > > 16:25 Stopped writing to disk. Will retry bias at 80V and monitor. > > 18:13 Motors cycled before leaving for night no beam in ring - attachment 9 > to test if the increase is beam related we will leave at 80V overnight with the beam blocked all night. > To avoid the rapidly increasing leakage current the iSet on the CAEN module is at 11uA with a trip time of 2s. > Encoding: HTML ELCode plain Suppress Email notification

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