FRP013 　ポスター③　 8月2日 1F大会議室 10:00-12:00

KEK ATFにおける積分電流トランスの統合データ収集システムアップグレードステータスレポート

KEK ATF Integrating Current Transformer signals Data Acquisition system upgrade status report

○ポポフ コンスタンティン，アリシェフ アレクサンダー，照沼 伸宏（High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan）

○Konstantin Popov, Alexander Aryshev, Nobuhiro Terunuma (High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan)

KEK ATF has seven Integrating Current Transformers (ICTs) to measure a bunch charge and a transmission between the accelerator sections. These ICTs’ signals acquisition system is based on the CAMAC gated 12-bit ADC modules. It integrates the entire pulse within a width of an input gate signal. Typical gate signal width is ~1 microsecond to share with other analogue signals acquisition, while the ICT signal width is ~150 ns. As a result, an additional noise is accumulated with a bunch charge. Also, CAMAC gated ADC module can accept only negative polarity signals. So, there is necessity to invert polarity of ICT signals, as well as amplify it after the inversion. As a result, the bunch charge measurement resolution becomes ~3 % (RMS). In order to improve the bunch charge and transmission measurement resolution, upgrade of the DAQ system based on the digitizer system has been done. The RedPitaya STEMlab 125-14 FPGA board was chosen as a digitizer development platform. This upgrade demonstrated three times better bunch charge and transmission measurement resolution than the previous system, and contributes the improvement of beam tuning of ATF.