1

Recap Clamp Install @ 1008 and Production

RIKEN/RBRCItaru Nakagawa

2

More Clamps Installed in IR

Installed upto 28 clamps to North St.3 and monitored drawing currents for a week.

Basically clamps didn’t add much drawing current up to humidity of 60+a %.

Input AC pulse from Cathode

Action Items from Review (I)1. AC readout

3

Reported in the June DC meeting

In order to see clear difference between connected/unconnected channels, the connection between clamp and GND needs to be modified.

Test bench using St-1 test chamber.

Clamp channel in contact w/ padClamp channel not in contact w/ pad

4

AC ReadoutHV side

GND side

HV side

GND side

DC Voltage Readout

AC Voltage ReadoutOne AC readout clamp will be available for test on June 15th.

5

AC Readout Test @ 1008

Input AC

Readout AC(connected)

Readout AC(not connected)

Input AC

Difference is 1/3but it is kind of touchy

6

Plan for AC readout

• We need to sit down and thoroughly repeat the AC readout measurement @ test bench.

• Pin down why we pickup AC signal even in non-connected channels.

• We’ll test AC readout again in 1008 in August.• Move on to Production with AC readout

design.

7

Action Items from Review II

• 1 Week Humidity test

8

Action Items from Review III

• Capacitors3kV Rated Capacitors being used for ~ 1.9kV Operation. Should be verified reliability.

DEBB33F101K(Prototype)

DEHR33F151K(Production)

DEA1X3F101J

100pF150pF

150pFGe

nera

ting

Heat

Size of Capacitor

Last longer (reliable)

DEB

DEH

DEA

Space constraintprevent from employing DEA model. -> DEH

9

Production Status

Assembly of base and print board will be done by Students manpower@ RIKEN.

10

Recap AssemblyCompany Location Meeting Contact Qualificatio

nREPIC Co, 　 　 　 　 OKCnex Co. Tokyo 6/27 Takahashi D

Soushin Co. Tokyo 6/29 Sato D　 　 　 　

Arusu Co. Fukushima 6/29 Sato C　 　 　 　 　

Pulax Co. Tokyo 7/4 Okamoto CRaising Co. Osaka 　 関 　

Trying to get quotes from several companies. Expecting bidding from a coupleof companies above. Three companies are qualified to bid (Rank >= C).

11

Print Board Assembly Production Schedule

• Procurement : 7/13 ~ 7/29• Judge & Order : ~ 8/7• Production (560 clamps) : – Getting Materials (1 ~ 1.5 Month)– Assembly (1 ~ 2 Months)– Delivery to RIKEN (Oct.14)

• (Parylene?) Coating (1~ 2 weeks, End of Oct.)• Assembly and QA@RIKEN (2weeks)• Shipping to BNL (1week, Mid~End of November)