KEKB Shift Report

Date : 2007/12/2(Sun)Day Shift : Ohnishi (K); Kawasumi, Yoshii, Nakamura, Kuzumi (M); Watanabe(B)Storm of aborts in the ﬁrst halfPlan
1. Downhill-simplex(Nelder-Mead) method

Peak L / G-Ratio: 13.346 ×1033 cm-2s-1 / 90 %Shift L / Day L
Beam Current: 133.9 pb-1 / - pb-1
: LER 1620 mA / HER 850 mA

Fill pattern : 3.06 spacing, 1 trains, 1584+1 bunches
Aborts : LERonly : 3+1(m) / HERonly : 5 / Both : 01

Shift Summary
injection trouble

D5B chiller water trouble

unknown

LER
single-pass
D8C

earthquake
PFPF-AR
Downhill-simplex
iBump

2

Injection Summary

HER injection efficiency ~ 60–70 %LER injection efficiency ~ 40–50 %3

Tuning Items
iBump (collision orbit adjustments, vertical oﬀset/angle)

LER
R1
R2
R3
R4
ηy*
ηy*'
ηx*
ηx*'

HERDownhill4

Knob 1 (parameter set #1) iBump

5

Knob 2 (parameter set #2)

6

Knob 3 (parameter set #3)

7

Troubles
1.

HER fake abort due to IOC(D08) reboot. Temp. abort from the HERabort kicker(AKH1̲2̲3) is disabled by Mimashi̲san to ﬁx theproblem(see morning shift report,(12/2), the connection line has beendamaged,).

2.

Earthquake abort in LER(9:24)

3.

HER injection touble(8:43-10:20) C6 klystron down. Beam gate wasopened during ramp up, then the feedback was driven crazy. Trouble
was ﬁxed by setting the parameter set of 6:00 am again.

4.

LER abort due to D8C cavity voltage(11:07)

5.

Unknown HER aborts(10:11, 11:26)
We disabled “Abort Not Ready” at D8 building to check the abortsystem.
8

Comments or opinions on operations
1.

Various #trials for the reﬂection can be made. (default is 1)
Secondarily bad-parameter set will be evaluated before going toa shrink mode in the following panel.

9

END
10

KEKB Shift Report

Date : 2007/12/02(Sun)Evening Shift :Funakoshi, Sugimura(K); Ma. Tanaka, Ohkubo (M);Calm Shift.
Tuning Plan
1. knob scanning. (not in the simplex scan panel)

Peak L / G-Ratio: 13.654 ×1033 cm-2s-1 / 91.5%
Shift L / Day L
Beam Current: 354.0 pb-1 / 729.5 pb-1
: LER 1620 mA / HER 850 mA

Fill pattern : 3.06 spacing, 1 trains, 1584+1 bunches
Aborts : LERonly : 0 / HERonly : 0 / Both : 0 1

Shift Summary
AR Inj.

Belle run almost perfectly!!
run change after safe 8-hour run

LER νydisk full

HER ηx'*2

Injection Summary3

Tuning Items


Waist Scan

4

Tuning Items 2
Horizontal Dispersion LER & HER



iBump



LER νy +0.004

5Knob 16

Knob 27

Knob 38

Comments
1. PF-AR Injection @22:00

9Troubles
1. Alarm message"ZHQC5LP̲1 Rejected(RangeOut)"
2. Alarm message"Septum left Temperature"
This was fake, but one of thermometer
recently shows slightly higher temperaturethan before.

10Operationに関する感想、提案など

11

終わり
12

KEKB Shift Report

Date : 2007/12/03(Mon.)

Morning Shift : Nakamura(K); Shimodoumae, Aoyama, Suzuki,

Almost stable except HER Crab Abort
To do list
1. Crab R2,R4 knob scan
2. Downhill Simplex knob scan

Peak L / G-Ratio: 13.830 ×1033 cm-2s-1 / 89 %Shift L / Day L
Beam Current: 247+α pb-1 / —-.- pb-1: LER 1620 mA / HER 850 mA

Fill pattern : 3.06 spacing, 1 trains, 1584+1 bunches
Aborts : LERonly : 0 / HERonly : 1 / Both : 01

Shift Summary2Injection Summary3

Tuning Items


HER ηx*', Crab R2,R4, iBump, Downhill Simplex(GR)
LER

HER

R1

Downhill Simplex

Downhill Simplex

R2

Downhill Simplex

Downhill Simplex

R3

Downhill Simplex

Downhill Simplex

R4

Downhill Simplex

Downhill Simplex

ηy*Downhill Simplex

Downhill Simplex

ηy*'Downhill Simplex

Downhill Simplex

ηx*ηx*'

0 → -12

R2@Crab 1 → 10→04

Knob 15

Knob 2

6

Knob 3

7

Comments
1. No comments8Troubles
1. 7:31 HER Abort; Crab D11F

9

Operationに関する感想、提案など

10終わり11