KEKB Shift Report

Date : 2007/12/1(Sat)Day Shift : Yoshida (K); Noguchi,Watanabe,Fuke (M); Igarashi (B)   

予定
1. Horizontal Oﬀset
2. Crab Tilt ( R2/R4 )3. Larger SimplexL  13.548 1033 cm-2s-1 L 
281.8 pb-1
  1620 850
Fill pattern  3.06 spacing, 1 trains, 1584+1 bunches
Aborts : LERonly : 0 / HERonly : 2 / Both : 11

Shift Summary
Crab D11-F

H-offset

R2,R4 (Crab Tilt)

Larger Simplex
after fixing program

2Injection Summary3Tuning Items
R1

1.2

LER

HER

R2
R3
R4
ηy*ηy*'
ηx*ηx*'

0 → 18

R2@Crab0→ 10

4Knob 15

Knob 2

6

Knob 3

7

Comments

8Troubles
1. 15:00 HER Abort (Crab D11-F) → LER
Abort
2. 15:16 / 15:26 HER Abort(Tune Change @ 650mA → Belle Abort)

9

10

!


11

KEKB Shift Report

Date : 2007/12/1(Sat.)

Evening Shift : Y.Yamamoto, Suetsugu (K); M.Tanaka, Ohkubo   ! !

Plan
1. Continue simplex knob scan (Luminosity max. mode)L  13.399 1033 cm-2s-1 L  L284.3 pb-1  912.5 pb-1
  1620 850
Fill pattern  3.06spacing, 1 trains, 1584+1 bunches
Aborts : LERonly : 1 / HERonly : 2 / Both : 01 !

HER beam abort followed by LER

HER beam abort

iBump(Vangle,Hoffset)

Simplex Scan2



 !

3

Tuning Items


Simplex Scan in Luminosity maximize mode

LER H-Tune +0.0004; to ﬁll bunches at the head ofbunch train. Little change in luminosity.

4Knob 15Knob 2

6

Knob 37

# of trips per day

Comments
1. Trip rate for Crab cavities is dependent on
the cavity voltage.

Trip rate was lower
after decreasing the cavityvoltage.
VC ↓VC ↑VC ↓VC was not changed.

DateVC ↑ VC ↓VC ↓VC ↓8Troubles
1. 19:39 HER Beam Abort; HER crab cavity
break down (Pressure burst in cavity).
The beam abort seemed to induce LER beamabort just few second later.
2. 19:55 HER Beam Abort; D11-D cavity breakdown (Discharge in cavity).

9

Operationに関する感想、提案など

10-)'11

KEKB Shift Report

Date : 2007/12/2(Sun)Morning Shift : Shibata (K); Aoyama, Shimodomae (M); Hazumi (B)

 Plan
1. Simplex Knob Scan (Lumi. Max. mode) ○2. Knob 1 ScanL  13.668 1033 cm-2s-1 L  L244.0+* pb-1  000.0 pb-1
  1620 850
Fill pattern  3.06 spacing, 1 trains, 1584+1 bunches
Aborts : LERonly : 1 / HERonly : 2 / Both : 0manual

crab cavity ccg
1

Shift Summarycrab cavityccg abort

unknownreason abortmanualabort

HER Abort Kicker
ThermometerTrouble2

!

3

Tuning Items


Simplex Scan in Luminosity Maximize modeIt seems that green ratio has not converged yet.

4Knob 15

Knob 2

6

Knob 3

7

Comments

8Troubles
1. 6:08 HER Crab D11F Cavity CCG Abort
2. HER Abort Kicker Thermometer Trouble
After HER Crab Abort "Ceramic Temp Alarm
AKH1̲2̲3" was given.
Thermometer of AKH1̲2̲3 said thetemperature was 9.9x1037 Degree.
The beam abort signal could not be reset, sowe could not restart physics run.
We contacted with Kikuchi̲san andMimashi̲san, and asked how to handle it.
According to their instruction, we entered KEKBtunnel and checked the control panel of theabort kicker cooling water system, but we could
not solve this problem.
Since the ﬂow rate of the cooling water was 9

Troubles
1. 8:31 HER Abort•

unknown reason

2. ZHQF4E̲14 Set Failed (TimeOut)
3. ZHQC5LP̲1 Rejected (RangeOut)
4. BPM D01-D12, LC1-8 Delayed10

Operationに関する感想、提案など

11.)'12