RE: Muon-On-Request

[Michael Barnes <barnes@triumf.ca>]

Dear Peter,

That makes sense. The nominal voltage rise time for the kicker is 45ns. Is
the 9m you mention from the exit of the plates?; if so, to get the full
"lever arm" effect do we need to add on another 15ns? (it is to early to
think about this properly !).

Cheers,
Mike


> Dear Mike,
>
> You are right. The time of flight is significant. With the current geomtry
> it is nearly 9 m, with muons of ~0.3 c, so the need about 100 ns. Some
> 30 ns might be due to the kicker ramp up. So we are not so far away.
>
> I will modify my elog accordingly.
>
> Thanks
>
> Peter
>
> On" Mon, 21 Nov 2005, Michael Barnes wrote:
>
>> Dear Peter,
>>
>> I don't understand the relative timing shown in the elog. I expected the
>> kicker to contribute approx. 250ns of delay: Francoise measured 280ns
>> (from the input to the TRIUMF splitter to the rise of deflector plate
>> voltage). So there is a discrepancy of 170ns --- but, given Francoise's
>> measurements (which are in the same ball park as my expectations), this
>> discrepancy is not due to the kicker.
>>
>> I would recommend that you check the relative cable delays, the length
>> of
>> the cable to the TRIUMF TTL splitter, and the deskewing of the channels
>> of
>> the oscilloscope.
>> What is the time of flight from the deflector plates to the detector
>> (and
>> how fast are the discriminators/electronics)?.
>>
>> Cheers,
>> Mike
>>
>> > Dear Mike,
>> >
>> > Thanks very much for the detailed explanation. Based on that we
>> > should be able to estimate the effect for our different running
>> > conditions. From our data we also should be able to see what
>> > difference it makes, if any.
>> >
>> > I have posted first Muon-On-Request info in elog
>> > http://kaon.physics.berkeley.edu:8080/run9/187
>> >
>> > user: muon
>> > passwd: 10-5soon
>> >
>> > Actually the switching delay seems longer than anticipated, but
>> > still accepatable.
>> >
>> > With best regards
>> >
>> > Peter
>> >
>> >
>> >
>>
>
> Peter Kammel  /  pkammel@uiuc.edu
> Department of Physics, Loomis Laboratory
> University of Illinois at Urbana-Champaign
> 1110 West Green Street, Urbana, IL 61801
> Tel (217) 333-5424 / Fax (217) 333-1215
>
>
>