BEAST report H Nakayama 20160408 KCG meeting LER

BEAST report H. Nakayama 2016/04/08 KCG meeting

LER study on Apr. 5 th • Emittance Control Knob(ECK) is ready (thx to Ohnishi-san) • BEAST runs at 50, 100, 150, 200, and 250 m. A with smaller beam size (knob=0) and nominal beam size used for vacuum scrubbing (knob=1) • Beast run at 250 m. A with knob=1, . 75, . 25, and 0 (Very first “beam-size scan”) Beam size scan I-scan (smaller beam size ) I-scan (nominal beam size )

LER beam-size scan Apr. 5 th, 15: 13 -15: 32, I =~250 m. A 14000 Beam size (um) life (min) 1 110 96 0. 75 90 84 0. 5 70 72 4000 0. 25 50 59 2000 0 40 50 12000 R 2 = 0, 9945 size^2 10000 8000 6000 0 0 0, 2 0, 025 0, 02 1/life knob 0, 4 0, 6 knob^2 0, 8 1 R 2 = 0, 9983 0, 015 0, 01 Touschek life at 110 um, 250 m. A 0, 005 life by other beam loss (beam gas) 0 0 0, 005 0, 015 1/size 0, 025 0, 03 Touschek life and beam-gas life is comparable now.

BEAST BG LYSO, Diamond, BGO BG increase seen in live monitor as beam size gets smaller More detailed analysis will come soon

BEAST BG vs. 1/size TPC (fast neutrons)

BEAST BG vs. 1/size He 3 (thermal neutrons)

Preparation for BEAST study in May • Touschek study – Emittance control knobs for LER/HER – Bunch-current scan (change fill pattern? ) • Beam-gas study – Vacuum bump • Collimator study – Collimator control panels, new fiber loss monitors, etc. “Dry” runs in April to check/develop hardware components, software tools, database, etc. . 関係されるグループの方は、ご協力お願いします。

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Beast shifter PHS If you want to talk to BEAST shifter in Tsukuba-hall, call 2455 We are not doing owl shift right now.

BEAST elog, weekly meeting BEAST elog https: //www. phys. hawaii. edu/elog-beast 2/BEAST 2+Operator/ https: //www. phys. hawaii. edu/elog-beast 2/BEAST 2+Expert/ Shifter manually upload plots (we are preparing autogeneration scheme). Beast weekly meeting INDICO https: //kds. kek. jp/indico/category/624/