A-1 RF gun Takuya Natsui

A-1 beam line

AT line (Thermal gun line) A1 line (RF gun line)

AT line A1 line to A1 line from AT line KL_A1_A KL_A1_B B RF Window AC_AT_2 GV_AT_2 SC_AT_1 KLY gallery tunnel IP_AT_L RF Window IP_A1A_KA IP_A1A_KB 真空マニホールド IP_A1A_KC QM_ AT_01,02,03 SC_AT_0 BX/Y_AT_0 AT_11,12,13 AC_AT_1 SC_AT_2 B IP_A1A_KD Att ＆Phase Shifter AT line Phase Shifter KL_A1_A to A1 line PB A1 line QM_ A1_01,02 A1_G1,G2 GV_A1_RG SC_A1_G BX/Y_A1_G SC_A1_0 KLY gallery tunnel IP_A1_G2 IP_A1_RC IP_A1_G1 IP_A1B_KD IP_A1B_KA IP_A1B_KB RF Window IP_A1B_KC BM_A1_0 GR_A1 IP_A1_LA IP_A1_LB A1_11,12,13 SC_A1_1 BM_A1_C1～C4 GV_A1_C4 AC_A1_1 Att ＆Phase Shifter KL_A1_B Dummy IP_A1A_KE 75L from AT line RF Window

Cathode plug

Used cathode plug damage (till 2015 Feb) Laser miss operation abrasion damage Break down damage

Cathode fix improvement Current cathode fix New cathode fix shrinkage fit No interspace dimension tolerance is required

New cathode installed to used cavity No interspace Installed to used cavity

Beam operation

Dummy road conditioning Conditioning log 2015/9/25 2015/10/15 Dummy road conditioning 18 MW achieved. The last operating period, 12 MW was maximum. Shrinkage fit and no miss-operation is necessary.

Laser injection to RF gun 2 w telescope BBO 4 w

laser 258 nm : 100 uJ 0.9 nC Q.E. = 4.4 x 10-5

We achieved two days stable operation. Recent operation log Disk amplifier is damaged Fix BPM error We achieved two days stable operation. (0.7 +/-0.3 nC)

0.7 nC 0.9 nC Beam charge is reduced at accelerating structure. Bunch length is too long. 0.7 nC 0.9 nC Bunch length measurement and bunch length control is required