Minutes of the 38th MT Committee Meeting
Date and time: November 19, 2010; 13:30–14:40
Place: Nishina Bldg., Room 201
Attendees: Sakai a (Chair), Abe a, Fukunishi a, Henning a, †, Kambara a, †, Kase a, Kubo a, Kubono b, Morimoto a(on behalf of Morita), Sakurai a, Shimoura b, Teranishi c, †, Ueno a, Uwamino a, Wakasugi aAbsent: En’yo a, †, Kamigaito a, Morita a, Motobayashi a, †, Yoshida a, †a

RNC / b CNS / c UEC / † observer(in no particular order)

Reports
1. Status reports on beam-time (BT) operation for the 48Ca seriesz

Accelerator status report (Fukunishi)¾

The MDC2 vacuum chamber of RRC was damaged.

¾The power supply for the final screen grid of the IRC-NW resonator was broken.

¾The 48Ca ion source material was depleted. The consumption rate, 2.4 mg/h, was much higher
than the rate of 0.7-1.0 mg/h in previous series. A new 48Ca rod with enrichment of ∼70 % will
be installed.

z

BigRIPS status report (Kubo)¾A leakage of the cooling water occurred about 10 days ago in a B3 level room of the RIBF.

¾Insufficient communication between BigRIPS-T and users resulted in friction during thesecondary beam tuning. Both parties agreed upon enhance communications.

z

Progress of the 48Ca series (Sakurai)¾Due to the reasons noted above, only 24 hours of BT have been delivered during the first twoweeks of the campaign.

¾It is hoped that the 48Ca beam will be restored by Nov. 24 (Wed.) (Kase).

¾The Machine-Time and Campaign coordinators will re-arrange the BT schedule. If the beamcannot be delivered with sufficient current, the campaign will be terminated. Machine studies
for a charge stripper system will be allocated instead (Sakai).

2. BT schedule changes (Sakai)z

The conditional BT of NP0906-RIBF03 (Fallon et al.) has been cancelled.

3. Status of the PAC meetings (Ueno)z

8th NP-PAC (Dec. 3–5)¾

Proposals (20 topics) were sent to the PAC members for review on Oct. 26.

¾

In-house technical review reports were sent to the PAC and the spokespersons on Oct. 27.

¾

A tentative program of the PAC meeting was sent to the RNC/CNS device contact persons andthe spokespersons on Nov. 1.

¾

Spokespersons for NP-PAC experiments completed before Mar. 31, 2010 were asked (on Oct.
28) to complete and submit status reports. These reports were then sent to the PAC chair on Nov.

16 as “Follow-up evaluations of completed beam times (2007-2010 Mar)”.
¾A set of approved proposals on the use of 48Ca, 124Xe, and 238U beams which remains as backlogs
in FY2011 was sent to the PAC on Nov. 9 for re-evaluation with a new grading scale introduced
at the last PAC.

z7th ML-PAC (Jan. 11-12, 2011)¾

zCall-for-proposals was launched on November 9 and will be closed on December 6.

3rd In-PAC (will be held on Jan., 2011)¾

Proposals can be submitted anytime as explained on the web site (Kambara).

Topics discussed
1. Approval of the minutes of the 37th meeting (Sakai)
2. FY2011 first half-year BT allocation of BigRIPS-based experiments (Sakai)z

A precedent call for BT scheduling requests of BigRIPS-based experiments has been postponed due
to unclear situation of accelerator status. The call will be made together with other BTs, presumably
in the middle of January, 2011.

z

A plan to commission a 124Xe beam next spring was discussed.

z

The possibility of 48Ca BT allocation was discussed. To allocate the BTs, all pillow-seal systems
should be installed prior to the BTs so as not to hamper the installation works. Details will bereported at the next meeting (Kubo).

zTechnical issues for 8-month operation of RIBF (Sakai)¾

Possibility was discussed whether Kr can be set up as a second-priority beam, following thefirst-priority beams 238U and 124Xe.

¾The delivery of intense Kr beams would be difficult to achieve in the upcoming year, since thedevelopment of a charge-stripper system requires time. (Fukunishi).

3. Technical review for ML-PAC proposals (Ueno)zApproval was granted to proceed with in-house technical review to RIBF-use proposals submitted tothe ML-PAC, as was done for the 8th NP-PAC.

4. Changes to MT Committee members (Sakai)z

The following member changes have been approved¾Abe, Group Director, Accelerator Applications Research Group, RNC, has assumed Kambara’spost in the MT Committee.

¾Kambara has become an observer as Deputy Group Director in charge of Industrial Cooperation,
User Liaison and Industrial Cooperation Group5. Next MT Committee meetingz

The next MT Committee meeting will be held on Friday, December 17, 2010, from 13:30 to 15:00.