Minutes of the 52nd Machine-Time Committee Meeting
Date and time: February 16, 2012; 13:30–15:00
Place: RIBF Bldg., Room 203
Attendees: Sakaiaa(Chair), Abe , En’yo

Motobayashia, †, Nishimuraaaaa, †a, †a, Fukunishi , Habaa, †abaaaba, Kase , Kubo , Kubono , Morita ,, Sakurai , Shimoura , Steppenbeck

Uesaka , Uwamino , Wakasugi , Yamaguchi
Absent: Kamigaito , Yoshidaa, †a, †, Sudac, †a,Takeuchi a, †, Ueno ,b, †abc†

RNC / CNS / RIBF-UEC / Observer(in random order)

Reports
1.

Change of the beam time schedule (Ueno)
The beam time (BT) of BigRIPS-based experiments in the upcoming 18O beam series scheduled forMarch has been changed in order to perform the official facility inspection of SAMURAI before its
commissioning of BT in the machine-study (MS) category, as well as to switch a secondary-beamtransport line of BigRIPS between ZD (F11) – SAMURAI (F13) by efficiently changing the position ofthe STQ18 magnet. Changing the STQ position is expected to take 1.5 days since this is the first
operation of the switching system. The operation time will eventually be reduced to 0.5 days undernormal operations. Details of the changes in the BT schedule are as follows:
Experimental-Program-Number

2.

Previous

ChangedMS11-16 (Nishimura/Doornenbal)

Mar/16/09:00 – Mar/18/ 9:00→

Mar/29/12:00 – Mar/31/ 9:00

Official Inspection11-03 (Uwamino)

Mar/19/09:00 – Mar/19/12:00→

Mar/16/09:00 – Mar/16/13:00

MS11-10 (Yoneda)

Mar/19/12:00 – Mar/26/ 9:00→

Mar/16/13:00 – Mar/23/ 9:00

This 18O series is continued to:MS11-11 (Michimasa)

Mar/31/21:00 – Apr/ 1/21:00

NP1012-SHARAQ06-01 (Shimoura)

Apr/ 1/21:00 – Apr/15/21:00

MS11-17 (Nishimura/Doornenbal)

Apr/16/ 9:00 – Apr/18/ 9:00

MS-EXP12-01 (Itahashi)

Apr/18/ 9:00 – Apr/19/17:00

RIBF operation (Fukunishi)
The accelerator status of the delivery of a polarized deuteron beam to NP0912-RIBF34-02 (Sekiguchi)
was reported. Although the condition of RRC, which has been suffering from a layer short problem,
seems to be getting worse, information on its stability is not sufficient enough to discuss the possible
suspension of the BT schedule to allow for the repair of RRC. The present accelerator tuning for thebeam delivery will be continued in which RRC is operated in a high magnetic field mode. If the beam can
not be delivered even in this mode, the RIBF BT should be suspended to have an urgent repair work done
for the period from spring to summer.

3.

SAMURAI-MS proposal under discussion (Sakai)
The judgment of approval/disapproval of the BT request for the SAMURAI commissioning, MS11-10

(Yoneda), was again deferred in the previous meeting, where a final decision was left to the MTCommittee chair. A revised MS proposal was re-submitted to the chair. After a meeting of hearing withthe representatives, the chair approved a BT of 6.5 days for the SAMURAI commissioning.
4.

CRIB operation policy (Shimoura / Yamaguchi)
The acceptance of CRIB proposals has been suspended. A draft plan of the CRIB operation policy for thenext few years was announced. The BT of CRIB experiments under a new policy will be treated
identically to the BT planned as RNC enterprise.

5.

Status of the PAC meetings (Ueno)

11th NP-PAC (June 18–19): Two candidates were selected as new PAC members after consultation
between RNC & CNS. Furthermore, it was announced that the call-for-proposals will be distributed
around mid-March.



9th ML-PAC & 3rd In-PAC: currently being prepared.

Topics discussed
1. Approval of the minutes of the previous meeting (Sakai)
2. Review of BT requests in the Machine Study and Detector Development categories (Sakai)
New BT requests for the first half of FY2012 in the Machine Study (MS) and Detector Development(DD) categories were reviewed through interviews or presentations by the experiment spokespersons.
After deliberation, the requests were approved. Their BT scheduling, however, was discussed separatelyfrom this approval as indicated in the topic 4 given below.
Exp-Prog-Num

Spokesperson

MS-ACC12-01
MS-ACC12-02
MS-ACC12-03
MS-ACC12-04
MS-ACC12-05
MS-ACC12-06
MS-EXP12-01
MS-EXP12-02

Okuno
Okuno
Okuno
Okuno
Fukunishi
Nakagawa
Itahashi
Michimasa

MS-EXP12-03

A. Yoshida

MS-EXP12-04

Yamaguchi

DD12-01

Ishibashi

Subject
Gas-stripper development
Gas-stripper development
Gas-stripper development
Gas-stripper development
Beam development
Beam development
BigRIPS beam transport
SHARAQ commissioning
Secondary-beam development forindustrial use
Beam development
Development of a -NMR/AFRsystem

Acc. / Beamline

Beamdays

RRC
RRCfRCfRC
SRC
RILAC ion source
BigRIPS
SHARAQ

238

UU
124
Xe
238
U70
Zn
50Ti
18O
48
Ca

344
4
5
7
1.3
1CRIB

7

Li

2

AVF

6Li

1pol. d2

AVF-E7B

238

3. BT scheduling of 70Zn primary beams in the FY2012 first half (Sakai)
The allocation of 48Ca and 124Xe primary beams for RIBF-SRC experiments was announced in thecall-for-BT-scheduling-requests for the first half of FY2012. After the deadline of the request, a letter
demanding additional allocation of 70Zn beams was submitted by Sakurai Chief Scientist (CS) to theRNC director. After a detailed explanation of the requested plan by Sakurai CS, a hearing from Dr.
Steppenbeck, a spokesperson of a relevant experiment, was also conducted. After deliberation,theCommittee approved to submit the acceptance notice of the request to the RNC director. The RNC
director also approved the request.
4. BT schedule of FY2012 first half (Sakai)
A BT schedule plan was discussed by a MT Committee working group (WG) at the WG meeting
held on February 7 and via email thereafter. The WG members are: Sakai, Haba, Kamigaito, Kubo,
Sakurai, Shimoura, Ueno, Uesaka, Uwamino, Yamaguchi from the MT Committee and Okuno
Deputy Group Director, Ikezawa TL, Sakamoto TL, Imao from the Accelerator Group, and Inabefrom the BigRIPS Team. (Ueno)After modification of the plan to reflect the decisions made as indicated in topics 2 and 3, the plan
was approved. The plan was disclosed to the spokespersons who submitted a BT-scheduling request.
The plan will be revised so as to reflect comments and further requests from them in response to thefullest extent possible. The schedule will be then fixed.

5. Next meetings
The next meeting will be held on Friday, March 16, 2012, at 13:30

In principle, the meetings in the next fiscal year starting from April will be held on every third
Friday of the month, at 13:30.