1. A-1 RF gun
Takuya Natsui

2. A-1 beam line

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

5. 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

6. Cathode plug

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

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

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

10. Beam operation

11. 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.

12. Laser injection to RF gun
2 w
telescope
BBO
4 w

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

14. 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)

15. 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