CERN Beam Test 98 Home Page

EMU CSC Beam Test

By Yu. Bonushkin
e-mail bonushki@physics.ucla.edu

And now, finally, results!
Beam test picture gallery (Oleg Prokofiev). There's a lot more pictures showing chamber production, tooling and measurement in EMU Picture Archive.

Beam Test Log

Shifts and Instructions

Online Run Summary

Introduction

Summer'98 we plan the P2 preproduction prototype chamber to be coupled to the most recent version of frontend and trigger electronics. It will be put into tests with both high energy mouns at H2 beam and with muon accompanied by the background levels similar to the ones in the real experiment - at GIF (Gamma Irradiation Facility), X5 area at CERN. Test beam preparations include the P2 chamber and its support construction, production of electronics, integration tests at FNAL, and finally, 9 weeks at CERN full of hard work and excitement.

This page was meant to be an information exchange and discussion page. I expect comments from interested people.

Measurement Program

P2 Cathode Strip Chamber and Support


Here's a picture of P2 with the support. The chamber itself is 133"(338cm) long, 36"(91cm) to 60"(152cm) wide, and 8"(20cm) thick. The support is 390cm long, 130cm wide and 204+/-35cm high. We accomplish movement along the chamber by simply pulling it across the beamline, then the foot is used to fix the axis of theta rotation, then we can adjust up and down with those 2 jacks within 20" range, and, finally we can adjust phi within +-45 degress with 0.1 degree precision. There are also safety and rigging rules for the support and the chamber (by D. Eartly).

A nice figure describing P2 geometry.

Tasks and schedules

Current list of tasks and schedule for delivery of major components and our request for the beam time :

The beam time request is a proposal we submitted to the CMS beam test leaders Gyorgy Bencze (H2) and Hans Reithler (GIF). It was discussed on March CMS week. The H2 schedule is confirmed and became official (see reference above). Same is expected to happen at GIF.

Other absolutely necessary components, both hadrware and software, to be prepared by end May, include:

Estimate of Required Low Voltage Power (NIM- and CAMAC-packaged units are left out).
Board Type Voltage Power/board #boards Total Power
96-ch. Cathode FEB +5V 27W 3 81W
DAQ Motherboard +5V 10W 1 10W
Anode FEB +5.5V 7W 3 20W
Comparator card -5.2V digital
+5V digital
-5V analog
+5V analog 		26W
15W
0.5W
1W 		3 80W
45W
1.5W
3W

Crucial People

I suggest the following people commit their time this summer. The principle was to have one expert per system or task at the moment when his/her expertise is crucial. x
Name Responsibility May19May27June3Jun.10Jun.17Jun.24July1July8Jul.15Jul.22
Nikolai Bondar' anode electronics xxxxxxx
Yuri Bonushkin coordination xxxxxxxxxx
Richard Breedon off-line, CMSIM tuning xxxxx
Adam Bujak off-line xxxxxxx
David Chrisman off-line xxxxxxxxxx
CMU students off-line xxxxxxxxxx
Tom Ferguson anode electronics, off-line xxxxxxx
Bill Gorn DAQ, on-line monitoring xxxxxxxxxx
Lisa Gorn on-line, off-line xxxxxxxxxx
Jay Hauser LCT cards, off-line xxxxxxx
Steve Hershman off-line, CMSIM tuning xxxxx
Andrei Korytov coordination xxxx
Christina Matthey off-line xxxxxxxxxx
Mike Matveev trigger motherboard xxxxxx
Sergei Medved' chamber/electronics xxxxxxx
Stan Otwinowski hardware xxxxxxxxxx
Paul Padley trigger MB, off-line, CMSIM xxxxxx
Jun Park DAQ, off-line xxx
Oleg Prokofiev chamber xxxx
H. C. Shankar comparator boards, LCT cards xxxxx
Bryan Smith anode electronics, off-line xxxxxxxxxx
Benn Tannenbaum off-line, LCT studies xxxxx
We sure will need more people to participate in the tests and off-line data analysis, so volunteers are welcome. (Volunteering means that the travel is covered from resources other than the beam test travel supplement.)

PNPI volunteered to send 6 people to the beam test: V. Sulimov, O. Kiselev, I. Tkach, Ye. Orishin, V. Sknar', N. Bondar' (50%).

Details on H2 and GIF

Here's a drawing of the CMS H2 beam area (a.k.a. RD5) with P2 placed in front of the M1 magnet between 2 beam chambers. Bill made a detailed drawing of current beamline components, their sizes and positions. The circles around the chamber show the full motion range required to be able to illuminate any part of the chamber at any angle. For the duration of our tests we can have the Silicon Beam Telescope (SiBT) close to us, which allows precision tracking for resolution and effeciency measurement (Lisa's mail). In addition, Bill suggested to use beam-defining chambers' to record the "hit history" with multihit TDC's. The beam height in this area is 2.47m above the floor so we need to raise the floor level by about 1.2m and make it flat so it's easy to rotate the chamber in Theta. The yellow squares under P2 are concrete blocks of the required height.

Some details about the beam area, mainly DAQ system (which we are going to be a part of) are posted on the CMS H2 home page. Fritz posted information in data bank structures, which might be useful for people planning to do analysis.

Here's a drawing of GIF (click to download the ps). Red lines are possible cable layouts. There is about 30 meter cable length from the chamber to the control room where we can put the CAMAC readout modules, DAQ stuff, computers etc., and there is about 10 meters to the "close-by elecronics area", where we can put our power supplies. According to Lisa, the different solid colors correspond to different floor heights: white is ground level, yellow is 1.6 meters, green is 2.4 meters, blue is 4.0 meters. The floor heights (in particular the 2.4 meter chamber area floor) can be changed in units of 80 cm, but this would have to be negotiated with all groups scheduled to run there. The beamline is 1.24 m above the 2.4 meter floor (so 3.64 meters above the real floor).

One can find a more detailed description of the GIF environment on the following pages:

Electronics

Cathode Electronics Manual

Trigger Electronics: Cathode LCT Card Documentation

Description of trigger electronics for the beam test could be found on trigger prototyping status page. As a result of our group recent discussions at UCLA we decided to establish a baseline of using ECL drivers between front-end cards and our LCT logic cards, since ECL can drive signals to TDCs and also can drive them further than other technologies. Electronics integration issues is our main concern at the moment since there are different opinions in the electronics group on where to place CAMAC crate with the trigger boards and the DAQ readout board. Signal quality for timing (1 ns precision is required), as well as timing for the DAQ motherbord are serious concerns. Here is a link to the UCLA-CMS muon trigger electronics page.

We started to understand how different electronics pieces are coming together. Here's Bill's block diagram of P2 electronics. For cabling details check out the figure links below.

Vlad Sedov prepared a drawing of wire group mapping onto the 96-channel Anode FEB, and a full list of connector pin assignment. I added the corresponding anode channel mapping onto the Anode LCT cards and 3377 TDC's. There is a difference in labeling the planes between CMU and UCLA. See next paragraph for description. Jonathan and Shankar made their decision on the Comparator card output/Cathode LCT card input pin assignment. And here's my graphical representation of strip mapping on a 96-channel Cathode FEB, on a 96-channel Comparator board, and on 2 48-strip (96 half strip) Cathode LCT modules.

There's a suggested scheme for the chamber plane, anode group and strip labeling. It would be nice if everybody agrees to this, but at the moment the plane labeling on the anode and cathode side are different, which tends to propagate into trigger wiring etc. If we agree to label the planes from top (A, or #1) of the chamber to the bottom (F, or #6), the pin assignment of the anode groups would look like this. I hope we converge soon.

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